中国物理B ›› 2019, Vol. 28 ›› Issue (6): 60703-060703.doi: 10.1088/1674-1056/28/6/060703

• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇    下一篇

Digitally calibrated broadband dual-comb gases absorption spectral measurements

Xinyi Chen(陈馨怡), Weipeng Zhang(张伟鹏), Haoyun Wei(尉昊赟), Yan Li(李岩)   

  1. State Key Laboratory of Precision Measurement Technology & Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
  • 收稿日期:2019-01-28 修回日期:2019-04-01 出版日期:2019-06-05 发布日期:2019-06-05
  • 通讯作者: Haoyun Wei E-mail:luckiwei@mail.tsinghua.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 61775114).

Digitally calibrated broadband dual-comb gases absorption spectral measurements

Xinyi Chen(陈馨怡), Weipeng Zhang(张伟鹏), Haoyun Wei(尉昊赟), Yan Li(李岩)   

  1. State Key Laboratory of Precision Measurement Technology & Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
  • Received:2019-01-28 Revised:2019-04-01 Online:2019-06-05 Published:2019-06-05
  • Contact: Haoyun Wei E-mail:luckiwei@mail.tsinghua.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 61775114).

摘要:

From the perspective of error compensation in the sampling process, a digital calibration algorithm was studied for the processing of spectral data in dual-comb spectroscopy. In this algorithm, dynamic adaptation to phase fluctuations maintained constant measurement results of spectral line positions and intensities. A mode-resolved broadband absorption spectrum was obtained over the full-spectral range of the comb with a Hertz linewidth of radio frequency comb mode. The measured spectrum spanned over 10 THz, which covered the multiplexed absorption regions of mixed gases, such as CO2 and N2O. The calibrated interferograms were also capable of direct coherent averaging in the time domain. The transmittance obtained deviated from the theoretical calculation by no more than 2% in the whole spectral span.

关键词: dual-comb spectroscopy, digital calibration

Abstract:

From the perspective of error compensation in the sampling process, a digital calibration algorithm was studied for the processing of spectral data in dual-comb spectroscopy. In this algorithm, dynamic adaptation to phase fluctuations maintained constant measurement results of spectral line positions and intensities. A mode-resolved broadband absorption spectrum was obtained over the full-spectral range of the comb with a Hertz linewidth of radio frequency comb mode. The measured spectrum spanned over 10 THz, which covered the multiplexed absorption regions of mixed gases, such as CO2 and N2O. The calibrated interferograms were also capable of direct coherent averaging in the time domain. The transmittance obtained deviated from the theoretical calculation by no more than 2% in the whole spectral span.

Key words: dual-comb spectroscopy, digital calibration

中图分类号:  (Infrared spectrometers, auxiliary equipment, and techniques)

  • 07.57.Ty
42.62.Eh (Metrological applications; optical frequency synthesizers for precision spectroscopy) 29.30.-h (Spectrometers and spectroscopic techniques)