Development of the data acquisition and control system for a portable THz time-domain spectrometer

Weibo Gao; Yingxin Wang; Ziran Zhao

doi:10.1117/12.2033220

23 August 2013 Development of the data acquisition and control system for a portable THz time-domain spectrometer

Weibo Gao, Yingxin Wang, Ziran Zhao

Proceedings Volume 8909, International Symposium on Photoelectronic Detection and Imaging 2013: Terahertz Technologies and Applications; 89090O (2013) https://doi.org/10.1117/12.2033220
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

This paper discusses the development of data acquisition and control system (DACS) for a portable terahertz time-domain spectrometer (THz-TDS). In this system, field programmable gate array (FPGA) severed as main control unit (MCU), which controls and harmonizes other functional modules of the spectrometer, including the linear delay stage, high voltage modulation and the AD converter. A digital lock-in amplifier implemented within the FPGA is employed to restore the weak THz signal. USB is used as the communication interface between the FPGA and the computer, which transfers commands and THz waveform data. The spectrometer can scan a waveform within a 30-ps time window in about 10 seconds, which has a spectral resolution better than 50GHz and a dynamic range up to 49dB.

Citation Download Citation

Weibo Gao, Yingxin Wang, and Ziran Zhao "Development of the data acquisition and control system for a portable THz time-domain spectrometer", Proc. SPIE 8909, International Symposium on Photoelectronic Detection and Imaging 2013: Terahertz Technologies and Applications, 89090O (23 August 2013); https://doi.org/10.1117/12.2033220

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