A fiber sensor for measuring gas concentration based on laser's transient regime

Wen Gang Guo, Xiu Feng Yang, Shao Jun Luo, Yong Nan Li, Cheng Hou Tu, Fu Yun Lu, Hong Jie Wang, En Bang Li, Chao Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)

Abstract

A novel fiber sensor for measuring gas concentration is reported, which is based on the transient regime of an Er-doped fiber laser. A Sagnac fiber loop and a FBG that also acts as the sensing element form the linear fiber laser cavity. By adjusting the central wavelength of the grating mirror, the oscillating wavelength is set to 1531.56 nm, which is a strong absorption peak of C2H2. The gas concentration can be obtained by measuring the laser build-up time, which is closely related with the cavity loss and therefore determined by the gas concentration. In the present experiment, the sensor's sensitivity and resolution can be adjusted simply by controlling the pumping level. When the pump pulse is at high level and low level of 25 mW and 5.9 mW, respectively, a sensitivity of 100 ppm/μs and a resolution of 20 ppm are achieved.
Original languageEnglish
Pages (from-to)308-312
Number of pages5
JournalWuli Xuebao/Acta Physica Sinica
Volume56
Issue number1
Publication statusPublished - 1 Jan 2007
Externally publishedYes

Keywords

  • Fiber sensor
  • Gas concentration
  • Laser build-up time
  • Transient regime

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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