Patent ID: 9494409
Filing Date: 2016-11-15
CPC Classification: G01B,G01N

Claim Text:
1. A test process for testing a bonding layer, the test process comprising: creating a flat layer thickness image of the bonding layer with a test device through an OCT process, the test device comprising: setting the measuring head to an identified defect area of the bonding layer by narrowing a depth measurement range to less than 10 interference maxima; optically disconnecting the reference arm via an optical switch device; measuring a layer thickness profile along a measurement track in the defect area of the bonding layer; optically connecting the reference arm via the optical switch device; measuring a distance profile on the measurement track in the defect area of the bonding layer; taking a profile scan of the bonding layer with alternating layer thickness measurements and distance measurements at a scan position on the measurement track, wherein the layer thickness measurements are measured with the reference arm optically disconnected and the distance measurements are measured with the reference arm optically connected; comparing the profile scan with the layer thickness profile and the distance profile in order to classify a measured value as a thickness measurement value or a distance measurement value.