Volume 6 Issue 5
Oct.  2013
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WANG Hong-tao, HUANG Yun-biao, HUANG Hong. Design of digital filter in laser gas analyzer[J]. Chinese Optics, 2013, 6(5): 729-735. doi: 10.3788/CO.20130605.0729
Citation: WANG Hong-tao, HUANG Yun-biao, HUANG Hong. Design of digital filter in laser gas analyzer[J]. Chinese Optics, 2013, 6(5): 729-735. doi: 10.3788/CO.20130605.0729

Design of digital filter in laser gas analyzer

doi: 10.3788/CO.20130605.0729
  • Received Date: 16 Jul 2013
  • Rev Recd Date: 15 Sep 2013
  • Publish Date: 10 Oct 2013
  • Due to the presence of system noises in second harmonic signals of a laser gas analyzer based on Tunable Diode Laser Absorption Spectroscopy(TDLAS), this paper designs an Finite Impulse Response(FIR) based filtering scheme to realize the online filtering of second harmonic of the laser gas analyzer. First, based on the theory of FIR digital filting, a FIR digital filter is designed with window functions based on a MATLAB(Matrix laboratory) software platform. Then, the corresponding algorithm is transplanted to the embedded system of laser gas analyzer. Finally, on the basis of waveform analysis of the second harmonic signals before and after filterings, it proves the feasibility of the proposed filter algorithm that the FIR digital filter is embedded system to realize the online filtering of second harmonic in the laser gas analyzer. Experimental results indicate that algorithm computation time for one set of second harmonic signal is 230 ms. The FIR filter can effectively filter out the interference signals of second harmonic by comparing the waveforms of the second harmonic signals before and after filterings. The FIR digital filter can basically meet the requirements of laser gas analyzer for denoising, smoothing the second harmonic signals with noises, lowering computational complexity as well as enhancing the performance of transplanting.

     

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