ACCELERATION SENSORS AND ACCELERATION MEASUREMENT METHODS USING OPTICAL WINDOW DISPLACEMENT MEASUREMENT

Abstract

The invention proposes an optical accelerometer sensor, in which the frame assembly consists of a fixed frame creating a mounting cavity and a weight block suspended relatively separately from the fixed frame via elastic beams to allow the weight block to move micro-dimensions along the measuring axis when acceleration is applied. Static clearance blocks are arranged on the fixed frame to limit the travel and restrict unwanted movement of the weight block. The optical sensor assembly consists of a light source, a receiving sensor, and an optical window acting as a light transmission channel through the weight block. The light source and receiving sensor are positioned on opposite sides in the direction of light propagation coinciding with the measuring axis. As the weight block moves, the light transmission conditions through the optical window change, varying the intensity of light reaching the receiving sensor and generating a corresponding electrical signal.The electronic unit includes a printed circuit board, a conversion circuit, and a microprocessor to convert the sensor's signal into voltage, perform analog-to-digital conversion, process the signal with calibration to deduce the acceleration along the measurement axis, and output the data to an external device via wired or wireless communication.