In this paper,applying Lagrange multiplier method and high order Lagrange multiplier method[1],we systematicaly derive coupled potential energy principle,coupled complementary energy principle,and generalized coupled potential energypriciples and generalized coupled complementary energy principles with two and three kinds of variables in photoelasticity.

In the article the reason of defocus is analyzed,and the influence of the defocus on the optical measurement is analyzed quantitatively by experiment.

A novel controlling and driving system for the experimental platform of optical measurement which is based on the microcontroller 80C31 is introduced.

The theory and procedures of inclination measurement by light are introduced and the operation reliability of it is analyzed briefly.

Particle selecting and providing techniques for laser measurement on the flow field of process equipment;

One of the basic principles of the laser measurement used in precision processing is studied, and a closedloop feedback control system of lasermeasured position of the machine worktable is produced, and the coordinate control illustrated diagram, suitable for controlling feed devices of many kinds of precision machines, is given.

By using of laser measurement technology Cangzhou Iron Lion s configuration is measured and kept in archives digitally.

Method deals with the line and the plane in analysis of the laser measure in engineering problems;