The development level of aviation precision manufacture technology has already become one of the important signs to weigh the comprehensive strength and the development of science and technology of the country. With the fast development of mechanical processing

electronics and electrics

automatic control and information techniques

the aviation precision manufacture technology

which is on the basis of these techniques

has made an unprecedented leap forward

new technologies

new processes and new products have been emerging. At the same time

with the increase of precision and performance in techniques and products

the demands for precision measurement of key parameters are growing. However

for devices in aviation manufacturing

many requirements cannot be met by the traditional measuring methods. The laser feedback effect is a phenomenon where the laser emitted from the laser is reflected or scattered by the surfaces of the targets and returns back into the laser cavity

modulating the intensity

polarization state

and the phase of the laser. In the precision measurement field

the laser feedback effect has the advantage as high sensitivity

which can measure noncooperative targets such as black

rough

cylindrical

micro or liquid targets; compact structure and easy alignment; high resolution and traceability to the laser wavelength. By using the laser feedback effect

precision measurement of aviation product can be carried out

realizing the precision locating and monitoring of real time working condition

which plays an irreplaceable role in improving the precision of aviation manufacturing and promoting the development of the industry.