CN103196846B - Standard signal source of gas absorption state in analog optical fiber gas sensing and detecting - Google Patents
Standard signal source of gas absorption state in analog optical fiber gas sensing and detecting Download PDFInfo
- Publication number
- CN103196846B CN103196846B CN201310087036.3A CN201310087036A CN103196846B CN 103196846 B CN103196846 B CN 103196846B CN 201310087036 A CN201310087036 A CN 201310087036A CN 103196846 B CN103196846 B CN 103196846B
- Authority
- CN
- China
- Prior art keywords
- frequency
- wave
- phase accumulator
- output
- waveform
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The invention discloses a standard signal source of a gas absorption state in analog optical fiber gas sensing and detecting, belonging to the technical field of signal sources in optical fiber sensing. The device comprises a waveform memory and an upper computer and the like, wherein a frequency word register is connected onto a phase accumulator and used for providing frequency words for the phase accumulator, the output of the phase accumulator is connected onto an address bus of the waveform memory, the waveform memory is connected onto an D/A (digital/analog) converter, a system clock frequency source is respectively connected with the phase accumulator and the D/A converter and used for providing the same fundamental frequency for the phase accumulator and the D/A converter, the D/A converter is connected with a low-pass filter to enable a signal wave after D/A conversion to be adjusted by a filtering circuit, and the upper computer is respectively connected onto the waveform memory and the frequency word register and used for writing waveform data for the waveform memory and writing frequency words for the frequency word register. The standard signal source is high in digitalization degree, convenient to integrate, small in volume, light in weight, flexible in amplitude and frequency modulation, stable in waveform and high in accuracy, and can provide high-quality standard signals for the optical fiber gas sensing and detecting.
Description
Technical field
The present invention relates to the standard signal source of gas absorption situation in a kind of analog optical fiber sensing detection gas, belong to the signal source technical field in Fibre Optical Sensor.
Background technology
At present, system used by employing Differential Absorption Optical Fiber gas detect sensing technology detects gas, its basic structure is as Fig. 1, first provide light signal by laser instrument 1, the aplanatic optically-coupled of two bundles is divided into enter optical fiber through beam splitter 2 by 1:1, one tunnel is through air chamber 3, and light gets to signal wave photodetector 4 is converted into gas information after gas absorption; Another road is directly got on photodetector becomes reference wave, and following two paths of signals, by filtering, turns the normalization circuits such as potential circuit, subtracter or divider and draws gas absorption peak.
Above-mentioned gas detection system can be roughly that boundary is divided into front and back two large divisions with photodetector, and first half is light path mainly, and latter half is circuit mainly.Obviously, many influence factors of first half can bring many difficulties to the debugging of back analog module.Many times can because of opticator cannot provide one comparatively standard signal wave and make the analog module of back debug cannot carry out or seem meaningless.Such as, the path length difference of double light path, optical fiber bending, stress is different, two photodetectors encapsulate into water vapour content difference, these all can affect flashlight, also need in addition oneself make air chamber come analog gas detect environment, air chamber makes trouble, build is heavy, and most importantly sealing problem, brings inconvenience to R&D process.(application number is the utility model patent " a kind of micro-water pick-up unit based on scanning method " of the people such as Chang Jun, Wang Zongliang, Wang Weijie, Song Fujun: 201120074340.0) be exactly that a kind of signal source that utilizes scans the gas-detecting device obtaining steam information, because the signal source of this device is got through a series of light paths such as air chambers by Distributed Feedback Laser bright dipping, therefore impact water-bed in Distributed Feedback Laser, collimating apparatus, photodetector is subject to, the accuracy of gained signal source certainly will be affected with precision, directly affects the debugging of back circuit.And signal generator common on the market can only produce the fixed waveforms such as sine wave, triangular wave, square wave, sawtooth wave, do not reach the requirement of analog gas Absorption far away.
Along with improving constantly of digitized degree, waveform generation technique there has also been a very large lifting, can make a standard signal source completely by digital mode, is used for analog gas absorbing state, directly be used as circuit debugging, instead of whole optical module above.And total digitalization, just with integrated, volume is little, lightweight.Therefore, come with convenient and swift as a standard signal source, greatly improve the debugging efficiency of analog module in optical fiber sensing system.
Summary of the invention
In order to eliminate all factors of existing gas detection sensor system optics part to the impact of signal wave, improving circuit debugging efficiency, shortening the R&D cycle, the invention provides the standard signal source of gas absorption situation in a kind of analog optical fiber sensing detection gas.Signal source of the present invention produces the waveform signal as Fig. 2 (c), and the depression amplitude of waveform can regulate corresponding to the difference of gas absorption degree in air chamber, and by constantly debugging the one_to_one corresponding that can realize 1ppm; Frequency-adjustable, during frequency modulation, the sunk part of waveform can launch along with the broadening of whole waveform.
The solution of the present invention host computer produces as (a) triangular wave in Fig. 2 and (b) cave in the Wave data of ripple respectively, then corresponding phase amplitude is adopted to be added the Wave data producing (c) output waveform, stored in wave memorizer, inquire about wave memorizer by frequency word control phase totalizer thus produce waveform.
Technical scheme of the present invention realizes in the following manner.
The standard signal source of gas absorption situation in a kind of analog optical fiber sensing detection gas, comprise frequency word register, phase accumulator, system clock frequency source, wave memorizer, host computer, D/A converter, low-pass filter, it is characterized in that frequency word register is connected on phase accumulator, provide frequency word for it; The output of phase accumulator is connected in the address wire of wave memorizer, and wave memorizer is connected on D/A converter, and system clock frequency source is connected with D/A converter with phase accumulator respectively, for they provide same base frequency; D/A converter is connected with low-pass filter, makes the filtered the regulation of electrical circuit of signal wave out after D/A conversion; Host computer is connected respectively on wave memorizer and frequency word register, to wave memorizer write Wave data with to frequency word register write frequency word.
Above-mentioned standard signal source produces a method for standard signal, and step is as follows:
1), host computer is analyzed the triangular wave collected in fiber parametric amplification gas experiment (reference waveform namely used in gas detect) and depression ripple (analog gas is to the absorption waveform of light) in advance, host computer obtains the Wave data of triangular wave and depression ripple, the Wave data of host computer to triangular wave and depression ripple makes the Wave data that addition process produces output wave, by output wave Wave data write wave memorizer;
2), system clock frequency source provides program-controlled clock signal for wave memorizer provides scan address, and data corresponding to each like this address just represent the range value of waveform on periodic sampling point;
3), host computer is to write frequency word in frequency word register, frequency word is as the accumulated value of phase accumulator, phase accumulator is when each pulse reference clock input, frequency word is accumulated once, it exports the corresponding increment of a corresponding cumulative step-length, output due to phase accumulator is connected in the address wire of wave memorizer, and therefore its change exported just is equivalent to table look-up, and so just the Wave data be stored in wave memorizer can be found through lookup table mode;
4) the digital quantity input D/A converter, by tabling look-up found, converts it to analog quantity;
5), under the effect in system clock frequency source, phase accumulator ceaselessly adds up, and namely ceaselessly tables look-up, and Wave data is all found and delivers to D/A converter and be converted to analog quantity, thus be synthesized whole for waveform;
6), the analog quantity that obtains after D/A converter is input to low-pass filter again and does smooth waveform, the process of decay stray wave, obtains the waveform wanted afterwards;
7) restriction of phase accumulator word length, is subject to, after phase accumulator is added to certain value, its output will be overflowed, the address of such wave memorizer will circulation primary, namely mean output waveform circulation one week, therefore in frequency word register, write different frequency words, just representative uses different phase increments, just can change the spilling time of phase accumulator, change output frequency when the clock frequency source of signal source is constant;
The frequency adjustment of signal source is as follows:
If frequency word is d, phase accumulator word length is N, and clock frequency is f
c, the output frequency of this signal source
therefore the output frequency of visible system only with frequency word d, clock frequency f
c, phase accumulator word length N relevant, at clock frequency f
cwhen fixing with the word length N of phase accumulator, just can change output frequency f easily by changing frequency word d
0owing to triangular wave and the two-part Wave data of depression ripple be have passed through process in advance in step 1), be integrated into a Wave data, with a frequency word d controlled frequency, the namely Wave data of output waveform, just can ensure that absorption dip part is launched along with the broadening of entirety during frequency adjustment like this;
The reference frequency output of signal source: minimum output frequency
△ f
0the namely frequency resolution of signal source, by the restriction of Nyquist's theorem, within the spilling cycle of a phase accumulator, at least to add up twice, namely inquire about wave memorizer sampling twice, again can synthesize output waveform, theoretic maximum output frequency is
Amplitude of the present invention regulates and can regulate by changing Wave data in wave memorizer, by the experimental result data analysis to associated fiber sensing detection gas, the depression waveform corresponding with 1ppm absorption intensity can be simulated, then just can control the various amplitude under its different degree of absorption with a coefficient relevant from gas concentration, air chamber length, gas pressure intensity easily.Certainly, this step was carried out before being integrated with depression wave datum by triangular wave, can ensure like this, to the independent adjustment of depression amplitude, not affect again the overall broadening of waveform during frequency modulation.
Advantage of the present invention is major part is digital device, and integrated level is high, and volume is little, and precision is high, and stability is strong, can adjust the amplitude of absorption dip, and when frequency modulation, depression can be launched according to different degrees of absorption along with the broadening of whole waveform.In the correlation engineering of fiber parametric amplification gas, the opticator of front end can be replaced, the standard signal of direct generation analog gas Absorption, debug for follow-up analog module, eliminate the influence factor that opticator is many, improve the efficiency of research and development of absorption this type systematic of fiber parametric amplification gas concentration.
Accompanying drawing explanation
Fig. 1. the part-structure figure of the absorption fiber parametric amplification gas of method of difference.
Wherein: 1, laser instrument, 2, beam splitter, 3, air chamber, 4, photodetector, 5, flashlight wave form output, 6, photodetector, 16, reference light wave form output.
Fig. 2. the corresponding situation schematic diagram of the phase place when type of waveform related in Wave data collection and data processing.
Wherein: (a), the triangular wave (reference waveform namely used in gas detect, can gather from the experiment of repeatedly fiber parametric amplification gas before and obtain), (b), depression ripple (analog gas is to the absorption of light), (c), output waveform (wave form output that standard signal source of the present invention finally produces).
Fig. 3. the structural representation of this standard signal source.
Wherein: 7, frequency word, 8, phase accumulator, 9, system clock frequency source, 10, wave memorizer, 11, host computer, 12, Wave data, 13, D/A converter, 14, low-pass filter, 15, wave form output, 17, frequency word register.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described, but be not limited thereto.
Embodiment 1:
The embodiment of the present invention 1 as shown in Figure 3, the standard signal source of gas absorption situation in a kind of analog optical fiber sensing detection gas, comprise frequency word register 17, phase accumulator 8, system clock frequency source 9, wave memorizer 10, host computer 11, D/A converter 13, low-pass filter 14, it is characterized in that frequency word register 17 is connected on phase accumulator 8, frequency word 7 is provided for it; The output of phase accumulator 8 is connected in the address wire of wave memorizer 10, and wave memorizer 10 is connected on D/A converter 13, and system clock frequency source 9 is connected with D/A converter 13 with phase accumulator 8 respectively, for they provide same base frequency; D/A converter 13 is connected with low-pass filter 14, makes the filtered the regulation of electrical circuit of signal wave out after D/A conversion; Host computer 11 is connected respectively on wave memorizer 10 and frequency word register 17, to wave memorizer 10 write Wave data 12 and give frequency word register 17 write frequency word.
Embodiment 2:
Above-mentioned standard signal source produces a method for standard signal, and step is as follows:
1), host computer is analyzed the triangular wave collected in fiber parametric amplification gas experiment (reference waveform namely used in gas detect) and depression ripple (analog gas is to the absorption waveform of light) in advance, host computer obtains the Wave data of triangular wave and depression ripple, the Wave data of host computer to triangular wave and depression ripple makes the Wave data that addition process produces output wave, by output wave Wave data write wave memorizer;
2), system clock frequency source provides program-controlled clock signal for wave memorizer provides scan address, and data corresponding to each like this address just represent the range value of waveform on periodic sampling point;
3), host computer is to write frequency word in frequency word register, frequency word is as the accumulated value of phase accumulator, phase accumulator is when each pulse reference clock input, frequency word is accumulated once, it exports the corresponding increment of a corresponding cumulative step-length, output due to phase accumulator is connected in the address wire of wave memorizer, and therefore its change exported just is equivalent to table look-up, and so just the Wave data be stored in wave memorizer can be found through lookup table mode;
4) the digital quantity input D/A converter, by tabling look-up found, converts it to analog quantity;
5), under the effect in system clock frequency source, phase accumulator ceaselessly adds up, and namely ceaselessly tables look-up, and Wave data is all found and delivers to D/A converter and be converted to analog quantity, thus be synthesized whole for waveform;
6), the analog quantity that obtains after D/A converter is input to low-pass filter again and does smooth waveform, the process of decay stray wave, obtains the waveform wanted afterwards;
7) restriction of phase accumulator word length, is subject to, after phase accumulator is added to certain value, its output will be overflowed, the address of such wave memorizer will circulation primary, namely mean output waveform circulation one week, therefore in frequency word register, write different frequency words, just representative uses different phase increments, just can change the spilling time of phase accumulator, change output frequency when the clock frequency source of signal source is constant;
The frequency adjustment of signal source is as follows:
If frequency word is d, phase accumulator word length is N, and clock frequency is f
c, the output frequency of this signal source
therefore the output frequency of visible system only with frequency word d, clock frequency f
c, phase accumulator word length N relevant, at clock frequency f
cwhen fixing with the word length N of phase accumulator, just can change output frequency f easily by changing frequency word d
0owing to triangular wave and the two-part Wave data of depression ripple be have passed through process in advance in step 1), be integrated into a Wave data, with a frequency word d controlled frequency, the namely Wave data of output waveform, just can ensure that absorption dip part is launched along with the broadening of entirety during frequency adjustment like this;
The reference frequency output of signal source: minimum output frequency
△ f
0the namely frequency resolution of signal source, by the restriction of Nyquist's theorem, within the spilling cycle of a phase accumulator, at least to add up twice, namely inquire about wave memorizer sampling twice, again can synthesize output waveform, theoretic maximum output frequency is
Claims (1)
1. in an analog optical fiber sensing detection gas, the standard signal source of gas absorption situation produces the method for standard signal, this signal source comprises frequency word register, phase accumulator, system clock frequency source, wave memorizer, host computer, D/A converter, low-pass filter, frequency word register is connected on phase accumulator, provides frequency word for it; The output of phase accumulator is connected in the address wire of wave memorizer, and wave memorizer is connected on D/A converter, and system clock frequency source is connected with D/A converter with phase accumulator respectively, for they provide same base frequency; D/A converter is connected with low-pass filter, makes the filtered the regulation of electrical circuit of signal wave out after D/A conversion; Host computer is connected respectively on wave memorizer and frequency word register, and to wave memorizer write Wave data with to frequency word register write frequency word, the method step that this signal source produces standard signal is as follows:
1), host computer is analyzed the triangular wave collected in fiber parametric amplification gas experiment and depression ripple in advance, host computer obtains the Wave data of triangular wave and depression ripple, the Wave data of host computer to triangular wave and depression ripple makes the Wave data that addition process produces output wave, by output wave Wave data write wave memorizer;
2), system clock frequency source provides program-controlled clock signal for wave memorizer provides scan address, and data corresponding to each like this address just represent the range value of waveform on periodic sampling point;
3), host computer is to write frequency word in frequency word register, frequency word is as the accumulated value of phase accumulator, phase accumulator is when each pulse reference clock input, frequency word is accumulated once, it exports the corresponding increment of a corresponding cumulative step-length, output due to phase accumulator is connected in the address wire of wave memorizer, and therefore its change exported just is equivalent to table look-up, and so just the Wave data be stored in wave memorizer can be found through lookup table mode;
4) the digital quantity input D/A converter, by tabling look-up found, converts it to analog quantity;
5), under the effect in system clock frequency source, phase accumulator ceaselessly adds up, and namely ceaselessly tables look-up, and Wave data is all found and delivers to D/A converter and be converted to analog quantity, thus be synthesized whole for waveform;
6), the analog quantity that obtains after D/A converter is input to low-pass filter again and does smooth waveform, the process of decay stray wave, obtains the waveform wanted afterwards;
7) restriction of phase accumulator word length, is subject to, after phase accumulator is added to certain value, its output will be overflowed, the address of such wave memorizer will circulation primary, namely mean output waveform circulation one week, therefore in frequency word register, write different frequency words, just representative uses different phase increments, just can change the spilling time of phase accumulator, change output frequency when the clock frequency source of signal source is constant;
The frequency adjustment of signal source is as follows:
If frequency word is d, phase accumulator word length is N, and clock frequency is
, the output frequency of this signal source
=
,
Therefore the output frequency of visible system only with frequency word d, clock frequency
, phase accumulator word length N relevant, in clock frequency
when fixing with the word length N of phase accumulator, just can change output frequency easily by changing frequency word d
owing to triangular wave and the two-part Wave data of depression ripple be have passed through process in advance in step 1), be integrated into a Wave data, with a frequency word d controlled frequency, the namely Wave data of output waveform, just can ensure that absorption dip part is launched along with the broadening of entirety during frequency adjustment like this;
The reference frequency output of signal source:
Minimum output frequency
,
the namely frequency resolution of signal source, by the restriction of Nyquist's theorem, within the spilling cycle of a phase accumulator, at least to add up twice, namely inquire about wave memorizer sampling twice, again can synthesize output waveform, theoretic maximum output frequency is
=
.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310087036.3A CN103196846B (en) | 2013-03-18 | 2013-03-18 | Standard signal source of gas absorption state in analog optical fiber gas sensing and detecting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310087036.3A CN103196846B (en) | 2013-03-18 | 2013-03-18 | Standard signal source of gas absorption state in analog optical fiber gas sensing and detecting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103196846A CN103196846A (en) | 2013-07-10 |
| CN103196846B true CN103196846B (en) | 2015-01-21 |
Family
ID=48719538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310087036.3A Expired - Fee Related CN103196846B (en) | 2013-03-18 | 2013-03-18 | Standard signal source of gas absorption state in analog optical fiber gas sensing and detecting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103196846B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1066506A (en) * | 1991-05-08 | 1992-11-25 | 安徽人民广播电台 | Sampling pulse and test signal be the electronic measuring device of base simultaneously |
| US5764087A (en) * | 1995-06-07 | 1998-06-09 | Aai Corporation | Direct digital to analog microwave frequency signal simulator |
| US6060917A (en) * | 1997-05-01 | 2000-05-09 | Mitel Semiconductor Limited | Frequency synthesizer |
| US6563350B1 (en) * | 2002-03-19 | 2003-05-13 | Credence Systems Corporation | Timing signal generator employing direct digital frequency synthesis |
| EP1469373A1 (en) * | 2003-04-16 | 2004-10-20 | Sony Ericsson Mobile Communications AB | Direct digital frequency synthesizer for cellular wireless communication systems based on fast frequency-hopped spread spectrum technology |
| CN101149630A (en) * | 2007-09-28 | 2008-03-26 | 电子科技大学 | DDS signal source amplitude-frequency characteristic compensation method and related DDS signal source |
| CN201063116Y (en) * | 2007-07-30 | 2008-05-21 | 河北师范大学 | Low frequency signal source for arbitrary waveform |
| CN101701971A (en) * | 2009-10-24 | 2010-05-05 | 中北大学 | High-precision multichannel analog signal source |
| CN101915619A (en) * | 2010-08-13 | 2010-12-15 | 深圳市豪恩安全科技有限公司 | Infrared test platform based waveform processing method, system and infrared test platform |
| CN102468868A (en) * | 2010-11-03 | 2012-05-23 | 北京普源精电科技有限公司 | DDS signal generator and frequency hopping method |
| CN102495021A (en) * | 2011-12-12 | 2012-06-13 | 山东大学 | System and method for detecting trace amount of steam based on two absorption peaks |
| CN203148839U (en) * | 2013-03-18 | 2013-08-21 | 山东大学 | Standard signal source for simulating gas absorption condition in optical fiber sensing detection gas |
-
2013
- 2013-03-18 CN CN201310087036.3A patent/CN103196846B/en not_active Expired - Fee Related
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1066506A (en) * | 1991-05-08 | 1992-11-25 | 安徽人民广播电台 | Sampling pulse and test signal be the electronic measuring device of base simultaneously |
| US5764087A (en) * | 1995-06-07 | 1998-06-09 | Aai Corporation | Direct digital to analog microwave frequency signal simulator |
| US6060917A (en) * | 1997-05-01 | 2000-05-09 | Mitel Semiconductor Limited | Frequency synthesizer |
| US6563350B1 (en) * | 2002-03-19 | 2003-05-13 | Credence Systems Corporation | Timing signal generator employing direct digital frequency synthesis |
| EP1469373A1 (en) * | 2003-04-16 | 2004-10-20 | Sony Ericsson Mobile Communications AB | Direct digital frequency synthesizer for cellular wireless communication systems based on fast frequency-hopped spread spectrum technology |
| CN201063116Y (en) * | 2007-07-30 | 2008-05-21 | 河北师范大学 | Low frequency signal source for arbitrary waveform |
| CN101149630A (en) * | 2007-09-28 | 2008-03-26 | 电子科技大学 | DDS signal source amplitude-frequency characteristic compensation method and related DDS signal source |
| CN101701971A (en) * | 2009-10-24 | 2010-05-05 | 中北大学 | High-precision multichannel analog signal source |
| CN101915619A (en) * | 2010-08-13 | 2010-12-15 | 深圳市豪恩安全科技有限公司 | Infrared test platform based waveform processing method, system and infrared test platform |
| CN102468868A (en) * | 2010-11-03 | 2012-05-23 | 北京普源精电科技有限公司 | DDS signal generator and frequency hopping method |
| CN102495021A (en) * | 2011-12-12 | 2012-06-13 | 山东大学 | System and method for detecting trace amount of steam based on two absorption peaks |
| CN203148839U (en) * | 2013-03-18 | 2013-08-21 | 山东大学 | Standard signal source for simulating gas absorption condition in optical fiber sensing detection gas |
Non-Patent Citations (2)
| Title |
|---|
| DDS信号源在CO激光气体检测系统中的应用;李源 等;《工业安全与环保》;20111210;第37卷(第12期);第21页2DDS基本工作原理，图1 * |
| 基于DDS的高精度任意波形发生器设计;王晨;《电子科技》;20100725;第23卷(第7期);第82页第2栏第2段-第83页第1栏第1段，图1-图2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103196846A (en) | 2013-07-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106124803A (en) | A kind of calibration system of optical fiber acceleration transducer | |
| CN106502308B (en) | A kind of wave generator system and production method of ultrasonic pulse pumping signal | |
| CN102620811B (en) | Novel high-precision heterodyne laser vibration measuring instrument | |
| CN1831541A (en) | Multichannel synchronous sinusoidal signal generator | |
| CN107181489A (en) | A kind of analog-to-digital conversion calibration method and device | |
| CN203148839U (en) | Standard signal source for simulating gas absorption condition in optical fiber sensing detection gas | |
| CN202956389U (en) | Portable wind speed measuring device | |
| CN206193081U (en) | Signal source, oscilloscope , universal meter all -in -one based on FPGA | |
| CN104713575A (en) | Method for testing frequency characteristic of closed loop fiber optic gyroscope | |
| CN103529256A (en) | Waveform synthesis device | |
| CN101661047B (en) | Output conversion device of strapdown inertial navigation accelerometer | |
| CN104914275A (en) | Novel MEMS capacitive accelerometer temperature compensating circuit | |
| Liao et al. | The design of LDF data acquisition system based on LabVIEW | |
| CN101718558B (en) | Laser gyroscope strapdown inertia navigation system output conversion device based on reusable IP core | |
| CN103196846B (en) | Standard signal source of gas absorption state in analog optical fiber gas sensing and detecting | |
| CN102520209B (en) | Quartz flexible accelerometer based on laser self-mixing interference | |
| CN203872140U (en) | Orthogonal lock-in amplifier device for fluorescence signal demodulation | |
| CN111413725B (en) | System and method for realizing gamma-gamma digital coincidence measurement by using virtual instrument technology | |
| CN101975584A (en) | Open loop measuring method applicable to detection circuit system error of interference optical fiber gyroscope | |
| CN1225641C (en) | Tunable laser spectrum secondary harmonic intelligent analyzing method and implementing equipment | |
| CN203502449U (en) | Waveform synthesizer | |
| CN109379312A (en) | A kind of Phase Compensation System and method for frequency signal | |
| CN104535496A (en) | Interference light signal processing method in phase type surface plasma resonance sensing system | |
| CN212324424U (en) | Second pulse generating device and measuring system of digital clock | |
| CN201199265Y (en) | Full-automatic calibrating apparatus for voltage monitoring instrument |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150121 Termination date: 20180318 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |