The technology of non-contact, large-range and high-accuracy absolute distance measurement plays an important role in nowaday measument technology with a bright future in application.

Review on the large scale absolute distance measurement;

With industrial development, the measurement accuracy of the product is to be further improved, the absolute distance measurement device needs to be improved in recent years.

An absolute distance measurement system based on optical multiplication;

Laser feedback interferometric system for both displacement and absolute distance measurement;

A novel wavelength scanning fiber optic interferometer for absolute distance measurement has been proposed.

A new reflective type fiber optic displacement sensor for absolute distance between the object reflective surface and the optical fiber end measurement is proposed in this paper.

The result shows that,the fiscal transfer reduces the relative disparity in fiscal capacity among counties in Gansu,but enlarges the absolute disparity;the primary object of fiscal transfer of Gansu province is to maintain government’s operation and to support the development of minority regions;however,reducing the ab.

Otherwise,the regional absolute disparity in Per-student fiscal expenditure have also constantly expanded,the polarization is very serious.

Research on 0.6328μm He-Ne laser and the excess fraction reduction methodfor method of large-scale absolute distance measurement;

And considers how to solve the unrestricted absolute value distance location problem with single-objective and construct the mathematical model of this problem by quoting proper changes.