Photoelectric Accelerometer
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In a photoelectric accelerometer, a seismic mass deflected by forces due to acceleration drives a shutter placed between a photosensor and a light source. The illumination of the photosensor is changed because of variation of the area of the orifices in the shutter through which the light beam passes. As a result, a photocurrent in the sensor becomes proportional to the amount of acceleration.
Photoelectric accelerometer. a = acceleration, 1 = seismic mass, 2 = spring element, 3 = light source, 4 = photosensor, 5 = case.
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