In this design

a kind of chamber design process and test results of reflective infrared methane sensor which has good stability and high sensitivity are put forward.Infrared methane sensor is based on the principle of dispersion type infrared absorption spectroscopy;non-dispersive infrared（NDIR） detection technology is applied to get infrared of methane characteristics wavelength

then dual channel compensation technology is used to test volume fraction of methane in gas chamber.Chamber is composed of infrared detector

transmission optical way

infrared source integrated assembly

whose structure and performance are important for device.Inner wall of chamber is designed as paraboloid of revolution with Au film coating

and infrared is reflected to be approximately parallel light

which is reflected to detector while propagating in chamber

so as to increase absorption optical path of methane

and sensitivity of chamber is improved.After completing the design

methane environment test shows that performance such as stability

sensitivity

reaction time of reflective chamber are excellent.