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在血液粘度测试仪的设计中，需要解决液面检测与信号处理问题。我们采用由红外发光二极管ＬＥＤ和光敏电阻ＲＬ组成的光电式液面传感器，通过本文介绍的信号处理电路实现血液与水液面的归一化，输出信号直接与计算机接口。
In the design of the blood viscosity tester, the problems of liquid level detection and signal processing need to be solved. We use a photoelectric level sensor consisting of an infrared light-emitting diode (LED) and a photo-resistor RL. The signal processing circuit described in this article is used to normalize the blood and water level, and the output signal is directly interfaced with the computer.