放大器输入为电压信号，与光敏二极管产生的光电流信号成比例。调制光柱以断路器同样的频率照射光敏二极管。

The amplifier input is a voltage proportional to the photocurrent signal produced by a photodiode, which is irradiated by a modulated light beam at the same chopper frequency.

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功率放大器可以实现交流信号的准确跟踪和放大，输出频率范围可达1000赫兹。

And the power amplifier can realize accurately tracking and amplification for ac signals with frequency range up to 1000hz.

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锁定放大器和取样积分器都不能抑制与参考信号同频率的干扰。 本文提出了一种能抑制这种干扰的方法。

This paper describes a method of suppressing correlation jamming at the frequency of reference signal which cannot be suppressed by lock-in amplifier and Boxcar integrator.

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