Research on absorption line profile of acetylene gas by changing environmental

Detection of trace chemicals sensitively and selectively is important for environmental, safety and industrial process monitoring. Based on erbium-doped photonic crystal fibre (ED-PCF) laser intra-cavity absorption spectroscopy detection technology, analyzing the infrared absorption spectrum of acetylene (C
₂
H
₂
) gas. The relationship between the gas concentration and the absorption of C
₂
H
₂
at the normal temperature is studied. Experimental results show that the self-broadening coefficient and the air collision widening coefficient of C
₂
H
₂
gas are (0.12065±0.00784) cm-1/atm and (0.12744±0.00244) cm
^-1
/atm in 1532.8nm absorption line, respectively. In addition, with the increase of C
₂
H
₂
concentration, the centre wavelength of the absorption peak redshift.