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在光纤传感器的实用化研究中,为保证探测器检测出的光强度变化能正确反映被测量的真实状态,要求传感器中光发送电路中光源的光信号强度必须相当稳定。传统的稳光强方式通常是直接监测流过发光二极管(LED)的电流,并通过某种形式的负反馈电路使得该驱动电流稳定来达到稳定光强的目的。这种稳光强方式存在一个很大的缺点,就是当发光器件即光源本身的特性发生变化时(如 LED 老化等),此时即使保持驱动电流恒定不变,其输出光强也会改变。本文介绍的光反馈稳光强电路,能弥补上面涉及的稳光强方式的不足,而且具有线性好、响应快、精度高等优点。它
In the practical research of optical fiber sensor, in order to ensure that the change of light intensity detected by the detector can correctly reflect the true state of the measurement, the light signal intensity of the light source in the light transmitting circuit of the sensor must be quite stable. The traditional robust method usually monitors the current flowing through a light emitting diode (LED) directly and stabilizes the driving current through some form of negative feedback circuit to achieve a stable light intensity. One of the major disadvantages of this method is that when the characteristics of the light-emitting device, that is, the light source itself are changed (such as LED aging), the output light intensity will change even if the driving current is kept constant. This article describes the strong feedback light stabilized circuit, can make up for the lack of stability of the light involved in the above, but also has good linearity, fast response, high accuracy and so on. it