Digital light sensor and eddy-current sensor measure thickness without contact. Surface of Coating reflects laser beam to optical sensor. Position of reflected spot on sensor used by microcomputer to calculate coating thickness. Eddy-current sensor maintains constant distance between optical sensor and metal substrate. When capabilities of available components fully exploited, instrument measures coatings from 0.001 to 6 in. (0.0025 to 15 cm) thick with accuracy of 1 part in 4,000. Instrument readily incorporated in automatic production and inspection systems. Used to inspect thermal-insulation layers, paint, and protective coatings. Also used to control application of coatings to preset thicknesses.
Measuring Thicknesses of Coatings on Metals
NASA Tech Briefs ; 10 , 3
1986-05-01
Miscellaneous
No indication
English
Measuring Thicknesses of Wastewater Films
NTRS | 1987
|Measuring Thicknesses With In Situ Ultrasonic Transducers
Online Contents | 1995
PREFERRED THICKNESSES FOR UNCOATED FLAT METALS (THRU 12 MM)
SAE Technical Papers | 1978