Design of heterodyne interferometer signal detectors
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1.
School of Optical-Electrical and computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
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Received Date:
2012-03-09
Accepted Date:
2012-04-05
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Abstract
In order to obtain the interference signal in a high-precision heterodyne interferometer,a new design of gain-controlled weak-signal detector was presented.In the detector circuit,a low noise photoelectric conversion pre-amplifier was designed based on AD645 to convert the weak interferometric beam effectively.A gain-controlled main amplifier was designed to guarantee the dynamic range for the signal and applicable for various processing circuit.A biquad band-pass filter was introduced to minimize the noise and the temperature drift.It is verified experimentally that the output signal of detector has high signal-to-noise ratio,large dynamic range and high gain.The detector with high performance can be used in high precision interferometers.
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