title: [The realization of moving mirror scanning in FTIR spectrometer using completely digital control method].
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.
authors.affiliation: State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China. rlb2011@mail.tsinghua.edu.cn
authors.forename: Li-Bing
authors.initials: LB
authors.lastname: Ren
authors.forename: Hong-Lei
authors.initials: HL
authors.lastname: Yang
authors.forename: Hao-Yun
authors.initials: HY
authors.lastname: Wei
authors.forename: Yan
authors.initials: Y
authors.lastname: Li