Abstract
The electromechanical system, which is an integral part of the infrasonic calibration and testing facility at the Institute of Geophysics and Planetary Physics at the University of California, has been studied analytically. An equation taking into account the electrical and mechanical parts as a closed system has been formulated, and the resulting frequency response and sensitivity curves compared with those obtained experimentally. A similar study was conducted on the fluid dynamics involved with the infrasonic sensor (the modified Moore Variometer) used in our infrasound studies. The results yielded a better understanding of capabilities of this device and verified its evaluation. The calibration facility itself has the capability of testing and evaluating the behavior of any infrasonic sensor in the frequency range of 1/1000–1000 cps, and pressure variations of 10−2–103 μbar, in the ambient atmosphere. The facility has also the capability of testing and calibrating the infrasonic sensors under high-altitude conditions, enabling the simulation of atmospheric density up to 90 km and of varied temperature conditions.
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