Acetylene detection based on diode laser QEPAS: combined wavelength and residual amplitude modulation

Cao, Yanguang; Jin, Wei; Ho, H. L.; Qi, Liang; Yang, Yuanhong

doi:10.1007/s00340-012-5221-4

Cited by 34 publications

(19 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The effect of the power modulation is discussed in detail in [13]. The curves are still monotone and steep near the center of the absorption line and suitable for offering an error signal for stabilization.…”

Section: B Amplitude Properties Of the Third Harmonic Signalmentioning

confidence: 98%

A QEPAS-Based Central Wavelength Stabilized Diode Laser for Gas Sensing

Gong

Xie

et al. 2015

IEEE Photon. Technol. Lett.

View full text Add to dashboard Cite

A quartz-enhanced photoacoustic spectroscopybased central wavelength stabilized distributed feedback diode laser is demonstrated in this letter. A quartz tuning fork is used as a sharp transducer to generate an error signal for wavelength tuning and stabilization without photodetector, which contributes to low cost, compact size, and freedom from ambient acoustic noises. The central wavelength of the diode laser obtains quickly fine-tuning at various modulation depths because it varies in time with the driving current. The wavelength stability of the diode laser is thus enhanced effectively. The wavelength stabilized diode laser is suited for absorption spectroscopy-based gas sensors.

show abstract

Section: B Amplitude Properties Of the Third Harmonic Signalmentioning

confidence: 98%

A QEPAS-Based Central Wavelength Stabilized Diode Laser for Gas Sensing

Gong

Xie

et al. 2015

IEEE Photon. Technol. Lett.

View full text Add to dashboard Cite

show abstract

“…As a result, the multi-QTF based "on-beam" spectrophone showed the signal amplitude of 58.8 mV, yielding a 1.4 times enhancement compared to the traditional single QTF based "on-beam" spectrophone and a 33 times enhancement compared to the single bare QTF based spectrophone. The asymmetry of the signal was due to the residual amplitude modulation of the laser [15].…”

Section: Qtf #3mentioning

confidence: 99%

Multi-Quartz Enhanced Photoacoustic Spectroscopy with Different Acoustic Microresonator Configurations

Zheng

Yin

et al. 2015

Journal of Spectroscopy

View full text Add to dashboard Cite

Acoustic microresonators were added to the recently developed multi-QTF based QEPAS spectrophone to enhance the signal amplitude. Two kinds of “on-beam” configurations were experimentally investigated in detail. The developed multi-QTF based “on-beam” spectrophone had a signal enhancement of 1.6 times compared with the traditional single QTF based “on-beam” spectrophone, with the approximate noise level. A normalized noise equivalent absorption coefficient (1σ) of 1.24 × 10−9 W·cm−1·Hz−1/2was obtained for water vapor detection at atmospheric pressure.

show abstract

“…Acetylene (C 2 H 2 ) is colorless, inflammable and explosive at ambient temperature and pressure and is widely used in the industrial field as a fuel and a basic raw material in organic synthesis. Accurate measurement and monitoring on C 2 H 2 in the industrial field is therefore extremely important for assuring a high quality of raw petrochemical materials and products [1][2][3][4]. Tunable laser absorption spectroscopy (TDLAS) has been widely used in trace gas detection because of its non-intrusive, sensitive and selective sensing characteristics [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Double-range near-infrared acetylene detection using a dual spot-ring Herriott cell (DSR-HC)

et al. 2018

View full text Add to dashboard Cite

Design and fabrication of a dual spot-ring Herriott cell (DSR-HC) were proposed. The sealed Herriott cell with a dimensional size of 5.5 cm × 9.2 cm × 32.1 cm, possessed two input/output coupling holes leading to two absorption path lengths of ~20 m and ~6 m, respectively. An acetylene (CH) sensor system with a double-range was developed using the DSR-HC and wavelength modulation spectroscopy (WMS) technique. A near-infrared distributed feedback (DFB) laser was employed for targeting a CH absorption line at 6521.2 cm. CH concentration measurements were carried out by modulating the laser at a 5 kHz frequency and demodulating the detector signal with LabVIEW software. An Allan-Werle deviation analysis indicated that the limit of detection (LoD) for the two absorption path lengths of 20 m and 6 m are 7.9 parts-per-million in volume (ppmv) and 4.0 ppmv, respectively. The DSR-HC concept can be used to fabricate similar cells for single-gas detection requiring two different detection ranges as well as for dual-gas detection requiring different absorption path lengths.

show abstract

Acetylene detection based on diode laser QEPAS: combined wavelength and residual amplitude modulation

Cited by 34 publications

References 29 publications

A QEPAS-Based Central Wavelength Stabilized Diode Laser for Gas Sensing

A QEPAS-Based Central Wavelength Stabilized Diode Laser for Gas Sensing

Multi-Quartz Enhanced Photoacoustic Spectroscopy with Different Acoustic Microresonator Configurations

Double-range near-infrared acetylene detection using a dual spot-ring Herriott cell (DSR-HC)

Contact Info

Product

Resources

About