Abstract: In intensity-modulated type optic fiber sensors, luminous intensity of a light source and operating stability of photoelectric receiver are the key factors for determining measuring accuracy. A light source driving circuit with soft starting function and constant brightness control is designed and used photoelectric receiver can fulfill the demands of the measuring system. The experiments show that the soft driving effectiveness of the circuit is obvious. It can inhibit the shock of voltage fluctuation and output voltage stability is better than 0.8%, thus provides an effective means for improving the measuring accuracy of this kind of sensors.Key words: Optical fiber sensors;Circuits;Intensity modulation;Photoelectric receiver
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