Laser speedometer is the pivotal equipment in the process of setting up stream AGC control system,but the principle of laser speedometer based on double velocity of light and double scattering doppler technology has never been reported.

Existing calibration methods of laser speedometer are summed up and one new calibration method and instrument with simulant target is put forward in this paper.

The reserch of pulse-semiconductor laser velocimeter;

In the control system for skin pass mill elongation,the measuring devices in common use are pulse generator and laser velocimeter,of which the control accuracy of the laser velocimeter is higher.

This leads to the performance improvement of laser particle sizer in the whole s.

Based on the classical Mie scattering theory, the influence on the measured results which is caused by the inputted refractive index in data processing of the small angle forward scattering laser particle sizer is investigated by means of POWELL inversion algorithm.

The classical Mie light scattering theory is used in the design of the laser particle sizers to extend their lower size limit.