Applied Physics B

, 124:51 | Cite as

Interband cascade laser-based ppbv-level mid-infrared methane detection using two digital lock-in amplifier schemes

  • Fang Song
  • Chuantao ZhengEmail author
  • Di Yu
  • Yanwen Zhou
  • Wanhong Yan
  • Weilin Ye
  • Yu Zhang
  • Yiding Wang
  • Frank K. Tittel
Part of the following topical collections:
  1. Mid-infrared and THz Laser Sources and Applications


A parts-per-billion in volume (ppbv) level mid-infrared methane (CH4) sensor system was demonstrated using second-harmonic wavelength modulation spectroscopy (2f-WMS). A 3291 nm interband cascade laser (ICL) and a multi-pass gas cell (MPGC) with a 16 m optical path length were adopted in the reported sensor system. Two digital lock-in amplifier (DLIA) schemes, a digital signal processor (DSP)-based DLIA and a LabVIEW-based DLIA, were used for harmonic signal extraction. A limit of detection (LoD) of ~ 13.07 ppbv with an averaging time of 2 s was achieved using the DSP-based DLIA and a LoD of ~ 5.84 ppbv was obtained using the LabVIEW-based DLIA with the same averaging time. A rise time of 0→2 parts-per-million in volume (ppmv) and fall time of 2→0 ppmv were observed. Outdoor atmospheric CH4 concentration measurements were carried out to evaluate the sensor performance using the two DLIA schemes.



The National Natural Science Foundation of China (Nos. 61627823, 61775079), National Key R&D Program of China (Nos. 2017YFB0402800, 2016YFD0700101, 2016YFC0303902), Key Science and Technology R&D program of Jilin Province, China (No. 20180201046GX), Industrial Innovation Program of Jilin Province, China (No. 2017C027), and the National Science Foundation (NSF) ERC MIRTHE award and Robert Welch Foundation (No. R4925U).


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Fang Song
    • 1
  • Chuantao Zheng
    • 1
    • 2
    Email author
  • Di Yu
    • 1
  • Yanwen Zhou
    • 1
  • Wanhong Yan
    • 1
  • Weilin Ye
    • 2
    • 3
  • Yu Zhang
    • 1
  • Yiding Wang
    • 1
  • Frank K. Tittel
    • 2
  1. 1.State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and EngineeringJilin UniversityChangchunChina
  2. 2.Department of Electrical and Computer EngineeringRice UniversityHoustonUSA
  3. 3.College of EngineeringShantou UniversityShantouChina

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