Design of electronic nose sensor with high sensitivity based on TDLAS-WMS
CHEN Si-hui
Abstract：In order to carry out the non-contact type detection of trace noxious gas (methane), based on the detection technology in combination with both tunable diode laser absorption spectroscopy (TDLAS) and wavelength modulation spectroscopy (WMS), the quantum cascaded laser (QCL) with the centre wavelength of 7.5μm was adopted, and an electronic nose system with high sensitivity was designed and developed.At room temperature, the luminescent spectrum of QCL could scan the methane (CH4) absorption line through adjusting the injection current of QCL.In addition, a compact herriott gas cell with a length of 40cm and a volume of 800mL was adopted to achieve the total optical path of 16m.The methane with different concentrations was detected with the developed sensor system.The results show that the relative detection error is less than 7%, and the minimum detection limit is 1×10-9.Moreover, the detection of other harmful gases can be realized through replacing QCL with other emitting wavelength.
Keywords：non-contacttracemethaneTDLAS-WMS technologyquantum cascaded laser (QCL)herriott gas celllong optical patchsensor
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 317-321 )