Displacement sensors based on laser triangulation ranging principle are widely used because of advantages of small volume and high precision.Highly integrated laser triangulation displacement sensor named LDSP—100 is developed.The algorithm utilizes in the first vision of LDSP—100 is based on polynomial fitting and Gauss fitting method

light spot localization is carried out

but stabilization is highly required in integrated design

single fitting method can not meets the needs.An optimized algorithm called segment average algorithm based on square weighted gray centroid is designed and realized.And this is proved to be better than Gauss fitting method.According to a series of experiment and analysis

it is found that the repeatability precision can achieve± 0.0037 mm

which equals to ± 0.003 7 % F.S.with segment average algorithm based on square weighted gray centroid.It is 60.4 % higher than gray centroid segment average algorithm and 22.9 % higher than Gauss fitting algorithm.