Off-beam QEPAS sensor using an 11-μm DFB-QCL with an optimized acoustic resonator

Rousseau, Roman; Loghmari, Zeineb; Bahriz, M.; Chamassi, Kaim; Teissier, R.; Баранов, А. Н.; Vicet, A.

doi:10.1364/oe.27.007435

Cited by 42 publications

(20 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Optical gas sensing methods have been widely used in trace gas detection due to their advantages of short response time, high sensitivity and selectivity, non-invasive and real-time detection [ 1 , 2 ]. Optical gas sensors can be divided into three groups: i) direct absorption spectroscopy based sensors, such tunable diode laser absorption spectroscopy (TDLAS); ii) cavity-enhanced absorption spectroscopy (CEAS) based sensors; iii) photoacoustic or quartz-enhanced photoacoustic and photothermal spectroscopy based sensors.…”

Section: Introductionmentioning

confidence: 99%

Trace gas sensing based on multi-quartz-enhanced photothermal spectroscopy

Qiao

et al. 2020

Photoacoustics

View full text Add to dashboard Cite

A multi-quartz-enhanced photothermal spectroscopy (M-QEPTS) based trace gas detection method is reported for the first time. Different from traditional QEPTS sensor employing a single quartz tuning fork (QTF) as a photothermal detector, two QTFs were used in M-QEPTS to increase the signal amplitude by adding the generated piezoelectric signals. The coating film of the QTFs was removed in order to improve the laser absorption and transmission. Acetylene (C 2 H 2 ) was chosen as the target analyte. Wavelength modulation spectroscopy (WMS) and 2nd harmonic detection were utilized for the concentration detection. Limit of detection (LoD) of 0.97 ppm was achieved with a 1 second integration time for the M-QEPTS sensor, which realized a 1.51 times signal enhancement compared to a traditional QEPTS sensor employing a single QTF. By using an Allan deviation analysis approach, LoD of 0.19 ppm for an optimum integration time of 200 s was obtained.

show abstract

Section: Introductionmentioning

confidence: 99%

Trace gas sensing based on multi-quartz-enhanced photothermal spectroscopy

Qiao

et al. 2020

Photoacoustics

View full text Add to dashboard Cite

show abstract

“…The detected photoacoustic (PA) signal scales linearly with the quality factor, enabling this type of sensor to achieve extremely high sensitivities. Gas concentrations of parts per billion (ppb) and parts per trillion (ppt) have been detected with QEPAS sensors for many different types of gasses [ 11 , 12 , 17 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. Moreover, the QEPAS sensor benefits from being highly immune to environmental noise sources.…”

Section: Introductionmentioning

confidence: 99%

Intrinsic Spectral Resolution Limitations of QEPAS Sensors for Fast and Broad Wavelength Tuning

Christensen¹,

Høgstedt²,

Friis³

et al. 2020

Sensors

View full text Add to dashboard Cite

Quartz-enhanced photoacoustic sensing is a promising method for low-concentration trace-gas monitoring due to the resonant signal enhancement provided by a high-Q quartz tuning fork. However, quartz-enhanced photoacoustic spectroscopy (QEPAS) is associated with a relatively slow acoustic decay, which results in a reduced spectral resolution and signal-to-noise ratio as the wavelength tuning rate is increased. In this work, we investigate the influence of wavelength scan rate on the spectral resolution and signal-to-noise ratio of QEPAS sensors. We demonstrate the acquisition of photoacoustic spectra from 3.1 μm to 3.6 μm using a tunable mid-infrared optical parametric oscillator. The spectra are attained using wavelength scan rates differing by more than two orders of magnitude (from 0.3 nm s−1 to 96 nm s−1). With this variation in scan rate, the spectral resolution is found to change from 2.5 cm−1 to 9 cm−1. The investigated gas samples are methane (in nitrogen) and a gas mixture consisting of methane, water, and ethanol. For the gas mixture, the reduced spectral resolution at fast scan rates significantly complicates the quantification of constituent gas concentrations.

show abstract

“…The output power of more than 1 W indicated the high output level. Therefore, such a source is especially beneficial to power related laser-based gas detection techniques, such as photoacoustic and photothermal spectroscopy [9,10]. The second paper submitted by W. Wang, L. Li, H. Zhang, J. Qin, Y. Lu, C. Xu, S. Li, Y. Shen, W. Yang, Y. Yang, and X. Yu reports a pulsed Tm,Ho:LuVO 4 solid-state laser with a repetition rate of 54.5 kHz and an output power of 1034 mW.…”

Section: Main Content Of the Special Issuementioning

confidence: 99%