| 摘要 |
A metal rod guide ( 30 ) supports a metal rod ( 1 ) that can be inclined at an arbitrary angle, the support is instantaneously released to produce a free fall state, and during the release period, a first end surface ( 2 ) of the metal rod is impacted by a projectile ( 3 ) at the same angle as the metal rod, generating an elastic wave pulse in the metal rod. A direct current acceleration sensor ( 23 ) detects an acceleration arising when the elastic wave pulse reflects at the other end surface ( 22 ) of the metal rod. A strain gauge ( 25 ) provided on a side surface of the metal rod and/or a laser interferometer ( 24 ) measure strain and end surface motion and the measured values are processed to obtain a frequency response of the direct current acceleration sensor and measure frequency characteristics of the direct current acceleration sensor.
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