Patent ID: 8115936
Filing Date: 2012-02-14
Classification: F22B,G01B,G01N,G21C,Y02E

Abstract:
1. A laser ultrasonic detection device comprising: a laser oscillating device including a seed laser oscillating element for oscillating seed laser light irradiated on a surface of an object to be measured from which an ultrasonic signal is detected and an optical amplifier for amplifying an oscillating light of the seed laser oscillating element in the form of pulses; an optical interference device for extracting an ultrasonic signal from a signal light of the laser light reflected and scattered from a measurement object surface; a signal processing device for processing an output signal of the optical interference device; and a condition detecting device for detecting a condition of the laser oscillating device; an optical fiber for transferring the laser light irradiated on a measurement object from the laser oscillation device; an end face reflecting detector for detecting a back-scattering and back-reflection light from the optical fiber; and a control device for controlling an incident position of the laser light to the optical fiber from the incident state at a time when an incident light result of the laser light detected by the end face reflecting detector is out of a preliminarily set allowable range, wherein the condition detecting device displays and records the incident state of the laser light detected by the end face reflecting detector, and when the incident state result of the laser light detected by the end face reflecting detector does not return within the allowable range even in driving of the control device, it is determined that some abnormality exists in a transferring path of the laser light.