High accuracy cavity retroreflector

The utility model discloses a high accuracy cavity retroreflector, including speculum and electrical system, the speculum is inlayed in the inside of grating polychromator, at the inside condensing lens of still installing of grating polychromator, and the front end of condensing lens still fixed mounting have a fused quartz prism, the left end of grating polychromator still fixed mounting have the light transmitter, still be provided with power supply unit on the left surface of light transmitter, and power supply unit's output is connected with electrical system through the control line, electrical system's left end still is connected with the continuous detection device of light at its inboard turning block through installing, the continuous detection device of light passes scanning generator through the transmitting illuminant and detects by the inside light that reflects of grating polychromator, and still installs the amplifier at scanning generator's right -hand member for the angle of refraction of li