This paper introduces a new method for testing the coating uniformity of object surface coating uniformity on the basis of analyzing the interrelations between reflective optical power and object surface coating thickness and uniformity on the basis of the principle of geometrical optics.To fit in with the randomness of surface coating

this sensor can be used for online tests on coating uniformity in different areas.On the basis of theoretical analysis

it sets up an experimental testing system.The test results show that changes in the uniformity of surface coating can be reflected by using this sensor with an accuracy of as high as 10 μm

holding out a good prospects for practical application in the future.