Patent ID: 7694568
Filing Date: 2010-04-13
Classification: G01N

Abstract:
1. A method for a noncontaminating and nondestructive testing for material defects of a polysilicon rod having a surface and having a diameter of from 3 mm to 300 mm and a length of 10 mm to 4500 mm, formed by CVD deposition of silicon in Siemens process, wherein the polysilicon rod or a portion thereof is exposed to ultrasound waves transmitted by an ultrasound transmitter and reflected ultrasound waves are received by an ultrasound receiver after the waves have passed through the polysilicon rod, such that material defects in the polysilicon rod are detected, ultrasound coupling being maintained between the rod and an ultrasound transmitter and an ultrasound receiver by a water jet technique in bubble-free deionized water.