To deal with the shortage of the traditional linearity measurement of long distance

a portable laser shearing interference alignment system is developed.Key parameters of the measuring elements are designed based on wedge plate shearing interference.Using ARM9 processor as the developing platform of the hardware

the algorithm about linear error valuation of long guide is designed by Embedded C++ under the embedded operating system WINCE 5.0.With the real-time calculation of phase difference between adjacent signal

Laser-beams’collimation calibration and equipments’assembling adjusting are well simplified.The signal gain is adjusted according to the amplitude

the long distance measurement function is realized.The system composed with ARM9 processor has low power dissipation

high accuracy and high integration level.It provides convenience for measurement at industrial environment and outdoors.