Wavelength modulation spectroscopy with a pulsed quantum cascade laser for the sensitive detection of acrylonitrile

Manne, J.; Lim, Alan; Jäger, Wolfgang; Tulip, J.

doi:10.1364/ao.50.00e112

Cited by 7 publications

(2 citation statements)

References 32 publications

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“…Subsequently, a mid-infrared semiconductor laser, the quantum cascade laser (QCL), appeared [11]. In recent years, absorption spectroscopy using QCLs has been developed [12][13][14][15][16] because many industrially important gas molecules have strong absorption bands in the mid-infrared region. Our research laboratory has also been focusing on the development of gas analyzers using QCLs [17,18].…”

Section: Introductionmentioning

confidence: 99%

High-sensitivity and low-interference gas analyzer with feature extraction from mid-infrared laser absorption-modulated signal

Shibuya

Podzorov

Matsuhama

et al. 2020

Meas. Sci. Technol.

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In this paper, we propose a gas analyzer that uses a quantum cascade laser (QCL) and achieves high sensitivity and gas selectivity with simple configuration and signal processing. Feature quantities are extracted from an absorption-modulated signal, which is obtained by the logarithmic conversion of a detector signal receiving a wavelength-modulated laser light. The extracted feature quantities are used for the determination of target and interfering gas concentration with simple simultaneous linear equations. As a result of the demonstration of CO gas measurement with a gas analyzer consisting of a 4.6 μm pulsed QCL, a small-volume Herriott cell with a path length of 5 m and a thermopile as a photodetector, it is shown that the limit of detection is 2.0 ppb at the integration time of 1 s and that interference by N2O can be eliminated. It is also shown that various disturbances such as spectral shift due to laser wavelength drift and spectral broadening due to partial pressure change of coexisting gases can be corrected by extracting appropriate additional feature quantities.

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Section: Introductionmentioning

confidence: 99%

High-sensitivity and low-interference gas analyzer with feature extraction from mid-infrared laser absorption-modulated signal

Shibuya

Podzorov

Matsuhama

et al. 2020

Meas. Sci. Technol.

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“…Compared with direct absorption spectroscopy (DAS), frequency modulation spectroscopy (FMS) is expected to have a higher signal-to-noise ratio, and the shape of the frequency modulation spectrum is the first derivative of the direct absorption spectrum [10]. QCL-based FMS for gas sensing [11][12][13] has been reported previously at a high modulation frequency of around 50 MHz but with the use of very slow wavelength tuning by means of electrical current ramp as long as 17 seconds. Recently, we showed an FMS scheme based on the all-optical modulation approach [14], with an estimated noise-equivalent sensitivity of 22 ppmv for methanol vapor gas in a 10 cm-long cell.…”

Section: Introductionmentioning

confidence: 99%

High-Speed Mid-Infrared Frequency Modulation Spectroscopy Based on Quantum Cascade Laser

Chen

Tang

et al. 2016

IEEE Photon. Technol. Lett.

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We demonstrated a high-speed mid-infrared frequency modulation spectroscopy scheme based on a distributed-feedback quantum cascade laser for application in trace gas sensing by means of all-optical frequency modulation. With this method, the modulation frequency spectrum of a gas sample can be obtained within the mid-infrared pulse duration of about 200 ns. A frequency modulation of the middle infrared lasing optical frequency was achieved in quantum cascade laser with a modulation frequency of 200 MHz by illuminating with a 1550 nm near-infrared laser. For CO gas, with 2-mW near-infrared illumination, the noise-equivalent sensitivity of the frequency modulation spectroscopy was estimated to be 0.12 ppmv for an absorption length of 6.1 meters, indicating an improvement by a factor of 7 compared with Voigt-fitted direct absorption spectroscopy (0.84 ppmv). The frequency modulation signal was found to be proportional to the incident near-infrared power, and therefore the noise-equivalent sensitivity is expected to be further improved by increasing the near-infrared illumination power. This high-speed frequency modulation spectroscopy based on the distributed-feedback quantum cascade laser has promising applications in high-speed and high-sensitivity gas sensing.Index Terms -frequency modulation spectroscopy, middle-infrared spectroscopy, quantum cascade laser, gas sensing.

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Mid-infrared heterodyne phase-sensitive dispersion spectroscopy using difference frequency generation

et al. 2018

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Wavelength modulation spectroscopy with a pulsed quantum cascade laser for the sensitive detection of acrylonitrile

Cited by 7 publications

References 32 publications

High-sensitivity and low-interference gas analyzer with feature extraction from mid-infrared laser absorption-modulated signal

High-sensitivity and low-interference gas analyzer with feature extraction from mid-infrared laser absorption-modulated signal

High-Speed Mid-Infrared Frequency Modulation Spectroscopy Based on Quantum Cascade Laser

Mid-infrared heterodyne phase-sensitive dispersion spectroscopy using difference frequency generation

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