Macdonald R I, Swekla B E
Appl Opt. 1990 Nov 1;29(31):4578-82. doi: 10.1364/AO.29.004578.
A frequency domain optical reflectometer which uses a GaAs interdigital photodetector both for optical detection and for mixing is described. A simple receiver with a postdetection bandwidth of the order of 10 kHz suffices for distance resolution of 10 m with this technique, greatly simplifying the electronics by comparison with pulsed reflectometers or swept frequency reflectometers employing electronic mixing. With available lasers the instrument could detect discrete optical reflections of -57 dB at a distance of 1 km. It is intended for remote measurement of refractive index in fluids, using the Fresnel reflection from a square-cleaved fiber as the sensor.
描述了一种频域光反射计，它使用砷化镓叉指式光电探测器进行光检测和混频。对于这种技术，一个具有约10 kHz检测后带宽的简单接收器足以实现10米的距离分辨率，与采用电子混频的脉冲反射计或扫频反射计相比，大大简化了电子设备。使用现有的激光器，该仪器可以在1公里的距离处检测到-57 dB的离散光反射。它旨在利用方形切割光纤的菲涅耳反射作为传感器，对流体中的折射率进行远程测量。
