Product Name: light interference methane tester 

 Product Model: CJG10/CJG100 type 

 Coal safety sign: MFA000004/MFA070003 

 Description: 
 The application of the product optical interference principle, can be quickly and accurately determine the presence of flammable, explosive flammable gas mixture in the ambient air concentration of methane gas, accurate measurement, easy to use features. 

 The main characteristics and uses: 
 Light interference methane determination of when an application of optical interferometry principle of measuring methane, carbon dioxide concentration of light gas portable instruments, instruments with high accuracy, quick and easy to operate, easy to use. Is mainly used to exist to measure methane concentration in the working environment of flammable, explosive, flammable gas mixture. 

 How it works: 
 Issued by the light scattering optical condenser focus the beam to reach the plane mirror, which part of the beam through the flat mirror reflection, by the chamber air to reach the refractive index prism, the refractive index prism to its refracted back to the other side of the air chamber back to the plane mirror and refraction to reflectivity of the surface membranes by deflected by the reflection of reflective film to the prism into the telescope system. Another part of the beam refracted into the flat mirror, the subsequent surface reflection film reflection through the chamber methane by the refractive index prism reflection but also back by the methane chamber and a plane mirror, after the plane mirror reflection with the above-mentioned part of the beam together to enter the reflecting prisms, by partial fold to enter the telescope system. Result of the optical path difference, the interference fringes in the focal plane of the objective lens and eyepiece both observed interference fringes. When the methane chamber and air chamber filled with the same gas, the interference fringe position does not move, but when the methane pumped into the methane chamber, the original location of the beam through the medium change, the interference fringes relative move for some distance. Measure the displacement, they will know the content of methane in the air.