Importance

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Abstract

A laser Doppler vibrometer includes a first optical coupler configured to split laser light from a laser light source into two beams of laser light, and one of which is as irradiation light and an other is local light, a sensor head configured to receive the irradiation light come from the first optical coupler through a first optical path, irradiate a measurement target with the irradiation light through a second optical path, receive, through the second optical path, measurement light obtained when the irradiation light is reflected by the measurement target, and cause the measurement light to propagate through the first optical path, a second optical coupler configured to generate interference light by causing the measurement light having propagated through the first optical path and the local light to interfere with each other and an electrical processing system configured to calculate a vibration state of the measurement target from the interference light. The sensor head includes a faraday rotator that rotates a polarization 45°.

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First Claim