4,622,856 A * 11/1986 Binder et al 73/727
4,843,445 A * 6/1989 Stemme 357/28
4,850,358 A * 7/1989 Millar 128/637
5,156,052 A * 10/1992 Johnson et al 73/727
5,226,423 A * 7/1993 Tenerz et al 128/673
5,259,248 A * 11/1993 Ugai et al 73/721
5,404,753 A * 4/1995 Hecht et al 73/204.22
5,447,073 A * 9/1995 Kalinoski 73/861.24
(Continued)
FOREIGN PATENT DOCUMENTS
DE 42 19 454 * 12/1993
EP 0 178 368 * 4/1995
OTHER PUBLICATIONS
Pijls, N., et al., "Fractional Flow Reserve: A Useful Index to Evaluate the Influence of an Epicardial Coronary Stenosis on Myocardial Blood Flow," Circulation, vol. 92, No. 11, pp. 3183-3193 (1995).*
Kalvesten, E., et al., "A Small-Size Silicon Microphone for Measurements in Turbulent Gas Flows," Sensors and Actuators A (1994).*
"Measurement Systems," 3rd Ed., Doebelin, pp. 506-517 (1983).*
Primary Examiner—William Oen
(74) Attorney, Agent, or Firm—Foley & Lardner LLP
The invention relates to a device for measuring pressure, temperature and/or flow velocity. It includes a sensor (6) with a sensor support body (13) provided with a diaphragm (15) covering a cavity (14) formed in the support body (13). A pressure sensitive element (41) is mounted on the diaphragm, for recording pressure. Furthermore, a temperature sensitive resistor (42) is mounted in the vicinity of the pressure sensitive resistor and has a known temperature dependence, for recording temperature. It also includes an electrical circuit (43, 44, 45, 46) selectively outputting signals from either of the pressure sensitive element and the temperature sensitive resistor.
36 Claims, 3 Drawing Sheets
