Patent Number: 6,612,172

Title: Sol-gel tube crack detection apparatus and method

Abstract: A crack detection method and system capable of detecting cracks on a scale of about 5 .mu.m or greater, useful for detecting cracks in sol-gel tubes. An electromagnetic radiation signal is transmitted from a sensor to a body in which cracking may occur. The signal is reflected back to and received by the sensor. An output voltage from the sensor is measured which is proportional to a signal characteristic change between the transmitted and received signals. Signal characteristics such as frequency, phase, and amplitude may be monitored. The signal characteristic change may result from one or more mechanisms selected from the group consisting of microscopic motion of the body, media transition and fluid movement.

Inventors: Cadet; Gardy (Orange, NJ), Lubecke; Victor M. (New Providence, NJ)

Assignee: Lucent Technologies Inc.

International Classification: G01S 13/50 (20060101); G01S 13/00 (20060101); G01S 13/88 (20060101); G01N 029/00 ()

Expiration Date: 09/02/2020