Spectroscopy and Spectral Analysis, Volume. 33, Issue 8, 2263(2013)
The Realization of Moving Mirror Scanning in FTIR Spectrometer Using Completely Digital Control Method
In view of the complexity of the conventional control of scanning mirror based on a digital-analog hybrid design, this paper focuses on a concise and efficient control method around the completely digital signal. The quadrate-encoder pulses A and B generated by the scanning mirror were sent into CPLD pins where an algorithm on position control and velocity control had been built. As a result, the CPLD will generate two PWM signals. These two signals are regenerated by a digital power chip to drive the voice of motor bundled with the moving mirror. Experiments validated that the stability of velocity of moving mirror is better than 97.2% and the method can improve the SNR of the measured spectrum and guarantee the accuracy of spectral qualitative and quantitative analyses.
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REN Li-bing, YANG Hong-lei, WEI Hao-yun, LI Yan. The Realization of Moving Mirror Scanning in FTIR Spectrometer Using Completely Digital Control Method[J]. Spectroscopy and Spectral Analysis, 2013, 33(8): 2263
Received: Dec. 21, 2012
Accepted: --
Published Online: Aug. 12, 2013
The Author Email: Li-bing REN (rlb2011@mail.tsinghua.edu.cn)