Abstract:

The difference between microphotometer and quasi-microphotometer was introduced. The visual diaphragm system is the important component of microphotometer, it provides the necessary condition of light beam injected vertically and horizontally, its locked measurement limit area enables the reflectance light of vitrinite to be measured not influenced by interference of reflectance of vitrinite. The trueness and accuracy of the vitrinite reflectivity were ensured. Quasi-microphotometer is lack of microphotometer sight diaphragm system, which can’t provide light beam vertically and horizontally injected, it has no the function to lock vitrinite to be measured and Kerogen is not interfered by the surrounding splitter line, the reflectivity  to be measured has no objective reality.