Application of laser lock—in imaging in rail wear measurement

When the rail wear measurement is carried out in the wild,the interference from outside strong sunlight is inevitable.In order to eliminate the interference effect of sunlight effectively,a laser lock-in imaging technology was utilized.An external controlling circuit triggered the lasers and CCD image acquisition synchronously,and high quality image was achieved by means of laser lock-in imaging method.Lots of experiments verified that laser lock-in imaging makes the output of the rail wear more stable and adapt to a wide range interference of outside complicated background light.Experimental results show that laser lock-in imaging can guarantee stability of the measurement system,fundamentally eliminating the random measurement errors.