Processing laser Doppler signal with a digital filter

Li Ding; Chao Jun Gao; Xinyi Wu

doi:10.1117/12.318181

13 August 1998 Processing laser Doppler signal with a digital filter

Li Ding, Chao Jun Gao, Xinyi Wu

Proceedings Volume 3555, Optical and Fiber Optic Sensor Systems; (1998) https://doi.org/10.1117/12.318181
Event: Photonics China '98, 1998, Beijing, China

Abstract

We can use laser Doppler effect to measure velocity. But the volume of laser Doppler signal is small and the signal-to- noise is small. If we use an analog filter to precess laser Doppler signal. It is difficult to change the frequency response of the analog filter. So it is difficult to get a good signal. In this paper, we use a digital filter to process laser Doppler signal. When we measure the velocity, we can get the laser Doppler signal volume by an analogy- digital converter. We can process the signal by a Chebyshev digital filter and save the signal in RAM. The digital filter's frequency response can be changed easy until we get a good Doppler signal. In this paper, we show how to design the chebyshev digital filter and how to use the filter to process the laser Doppler signal.

Citation Download Citation

Li Ding, Chao Jun Gao, and Xinyi Wu "Processing laser Doppler signal with a digital filter", Proc. SPIE 3555, Optical and Fiber Optic Sensor Systems, (13 August 1998); https://doi.org/10.1117/12.318181

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