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The photoelectric pick-up device for picking up acoustic vibration signals with photoelectric transducing and converting them into electric signals is mainly composed of light emission and photosensitive receiving units with at least one pair of them for each channel. An optical resonant cavity is located before them. When optical transmitter emits a light beam with a constant or stable power, and a vibration or deformation of tested variable is generated and sensed by a sensing system connected with light valve, the amplitude of the light flux received by photosensitive receiver may be changed and then converted into electric signal varying with vibration or deformation by light valve.

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