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

Y. Cao, Wei Jin, H. L. Ho, L. Qi, Y. H. Yang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

30 Citations (Scopus)


Quartz-enhanced photoacoustic spectroscopy (QEPAS) is demonstrated for acetylene detection at atmospheric pressure and room temperature with a fiber-coupled distributed feedback (DFB) diode laser operating at ~1.53 μm. An efficient approach for gas concentration calibration is demonstrated. The effect of residual amplitude modulation on the performance of wavelength modulated QEPAS is investigated theoretically and experimentally. With optimized spectrophone parameters and modulation depth, a minimum detectable limit (1σ) of ~2 part-per-million volume (ppmv) was achieved with an 8.44-mW diode laser, which corresponds to a normalized noise equivalent coefficient (1σ) of 6.16 × 10-8cm-1W/Hz1/2.
Original languageEnglish
Pages (from-to)359-366
Number of pages8
JournalApplied Physics B: Lasers and Optics
Issue number2
Publication statusPublished - 1 Nov 2012

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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