The development of optical glass and the development of optical instruments are inseparable. The new reform of optical system often brings new demands to optical glass, thus promoting the development of optical glass. Similarly, the success of trial production of new varieties of glass also promotes the development of optical instruments in turn. The concept and recognition of the high and low aperture: when the sample and the workpiece are in contact with the center, the high diaphragm appears; if both are in contact with the edge, the low aperture appears. 1, perimeter pressure method, low aperture: the stripe moves from the edge to the center; the high aperture: the stripe moves from the center to the edge. 2, side pressure method, low aperture fringe: curved concave support pressure; high aperture: concave curved stripes towards the pressure points. 3, color sequence method: low light circle: the center to the edge of the color order of "blue, red, yellow", high aperture: the center to the edge of the color order of "yellow, red, blue".

1, through intuition; ultraviolet, visible light, infrared (0.15um-14um), suitable for all current thermal infrared imager, infrared thermometer, ultraviolet imager

2, safety; the use of infrared windows can avoid the harm of electromagnetic radiation, high pressure, high temperature and other harsh sites to users. It is safe to conduct live detection of contact temperature on electrical cabinets and all kinds of high-temperature equipment.

3, fast; the installation and transformation of the electric cabinet only takes a few minutes. After installation, it is convenient to open the protective cover. It can observe many targets quickly and carry out internal testing.

4, save money; the use of infrared window, the user is not interrupted, do not interfere with the premise of equipment operation, preventive detection of dangerous area, not needmaintenance, thus saving a lot of expenses; 5, no special maintenance; no damage, can be used for more than 20 years

Long wave infrared window, working wavelength 0.15-14 micron. The main detection of low temperature and normal temperature, in the power industry, long wave basically meet the existing power equipment fault detection, simple, fast, comprehensive and accurate solution to the problem of difficult detection in switchgear, and realize online real-time detection of switchgear.  At 0.15 microns, the infrared transmittance of the window is 94%. At 12.5 microns, the infrared transmittance of the window is 92%. Short wave infrared window, working wavelength 0.15-7 micron. High temperature objects above 500 degrees centigrade. For example, in steel making and other industries. At 0.15 microns, the infrared transmittance of the window is 94%. At 7 microns, the infrared transmittance of the window is 92%.