| 光谱学与光谱分析 |
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| The Realization of Moving Mirror Scanning in FTIR Spectrometer Using Completely Digital Control Method |
| REN Li-bing, YANG Hong-lei, WEI Hao-yun, LI Yan |
| State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China |
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Abstract 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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Received: 2012-12-21
Accepted: 2013-03-20
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Corresponding Authors:
REN Li-bing
E-mail: rlb2011@mail.tsinghua.edu.cn
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