| 摘要 |
PURPOSE:To improve the dynamic response performance of an accelerometer, etc., using a strain gauge by applying a force to a body on which the strain gauge is stuck, measuring the strain of a marker on the surface of the body and time variation of a signal from the strain gauge at the same time, and also comparing both signals with each other while varying the frequency of the applied force. CONSTITUTION:The strain gauge 1 is stuck on the body whose strain varies like a sine wave. Water 5 serves a medium which propagates a beam 4 from an acoustic lens 6 to the marker 2. A protection film 3 protects the gauge 1 from the water, etc., to stabilize the performance of the gauge. Here, a force which varies periodically is applied to the body and time variation in the gain of a reflected wave from the marker 2 is traced to measure the net dynamic strain of the body. The signal from the gauge itself, on the other hand, is sampled in synchronism with the timing of the reflection of a convergent ultrasonic wave from the lens 6 by the marker 2. The phases of the two signals obtained as mentioned above are utilized to evaluate the dynamic response performance of the gauge 1.
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