Response tests of a sputtered gage pressure transducer

Dynamic response characteristics of the CEC 1000 sputtered gage pressure transducer was investigated. These transducers feature a narrow diameter, integral, reentrant tube in front of the gaged diaphram. A conventional shock tube was used under conditions of an initial static He gas pressure of 20 psi and applied a step pressure of about psi. Two resonant frequencies, at about 1.8 kHz and 11 kHz, were observed. A shockless pressure step generator was also used with both He gas filling and water filling of the transducer's reentrant tube. Initial static pressure was 10 psi. Step pressures of 30, 60, and 90 psi were applied. Under gas filled conditions, the resonant frequencies were found to be about 1.4 kHz and 11 kHz. Under water filled conditions, the low resonance decreased to a range of about 0.7 to 1.1 kHz. Damping essentially eliminated the high frequency resonance.