在強度調制型光纖傳感器中，光源發光強度和光電接收器工作的穩定性，是決定測量精度的關鍵因素。設計了具有軟啟動功能和恒亮度控制的光源驅動電路，所用光電接收器能滿足測量系統要求。實驗表明，該電路軟啟動效果明顯，能抑制電壓波動沖擊，輸出電壓穩定度優于0.8%，為提高該類傳感器測量精度提供了有效的手段。
關鍵詞：光纖傳感器；電路；強度調制；光電接收器
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