The Study Of Laser Interferometer As Monitor Of Crust Deformation

Mankind has suffered the pain of geological disasters on earth for a long time, and the monitoring of crust deformation will be beneficial to the effective prevention of such damages. Taking gas laser with highly frequency stability as light source, adopting Michelson interferometer with unequal arms and a sophisticated electronic fringe counting model, the laser interference system can do a great job in the prevention of geological disasters such as earthquake.Based on the analysis of the causes of earthquakes, the method of using high-precision interferometer for crust deformation detection is promoted. According to the characteristics of Michelson interferometer, a interferometer with unequal arms is designed for the measurement of tiny deformation. An enclosed structure for the monitoring station is proposed for further enhancement of the accuracy. The atmosphere which can affect the refractive index of air is sealed in a column where the temperature, pressure and humidity maintain constant. In addition, analysis are made from various factors which would impact the accuracy, and various possible errors are considered base on it.