A gas absorption cell with an adjustable optical path can meet the requirements of an optical fiber gas sensor with the different detection sensitivity and range. Basic structure of the gas absorption cell is introduced.Optical parameters of the gas absorption cell are identified through the optical simulation and analysis of the gas absorption cell using Trace Pro. Structure

anticorrosion process

sealing process and adjustable optical path of the gas absorption cell are studied. Experimental results demonstrate that light range of cell optical path can be modulated at 0. 8

30 m and the cell can be fully applied in detection of the low concentration gas and high concentration gas.