Patent ID: 9441952
Filing Date: 2016-09-13
CPC Classification: G01B,H01L,H05K

Claim Text:
1. A method comprising: transmitting light from a first fixed point to a surface of an integrated circuit substrate or a portion of an integrated circuit package; detecting a reflection of the transmitter light at a second point; measuring a first reflection angle of the transmitted light between the first point and the second point; determining a first distance between the first point and the surface based on the first reflection angle; introducing a material onto the surface; transmitting light from the first position to the surface of the introduced material; measuring a second reflection angle of the transmitted light from the surface of the introduced material between the first point and the second point; determining a second distance between the first position and the surface of the introduced material based on the second reflection angle; and determining a thickness of the introduced material by subtracting the second distance from the first distance.