Thursday, May 11, 2017

Abstract-Finger print sensor molding thickness none destructive measurement with Terahertz technology

Longhai Liu  Haitao Jiang  Ying Wang  Qinghua Shou  Jianhua Xie  Yaqi Lu

Fingerprint sensor (FPS) becomes rapidly popular due to small size and high safety. The molding thickness of capacitive FPS will affect its performance and needs to be accurately measured and controlled. Different from cutting and laser drilling method, one none destructive method with Terahertz electromagnetic wave is introduced. Terahertz wave can penetrate into the molding package materials. The molding thickness can be measured through time delay of two pulse Terahertz waves. The measured thickness is correlated with microscope view and the result is within ±4um gap.

No comments: