A sensitivity-enhanced all-optical probe for non-contact laser ultrasonic inspection

Non-contact laser ultrasonic technique has been increasingly implemented for non-destructive inspections in harsh environments, high-temperature fields, and components having complex geometries. However, the poor signal-to-noise ratio and low amplitude of laser generated ultrasonic signals under a t...

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Veröffentlicht in:Applied physics letters 2023-10, Vol.123 (17)
Hauptverfasser: Cheng, Zhongwen, Yu, Jinhao, Long, Bainian, Zeng, Lvming, Ji, Xuanrong
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container_title Applied physics letters
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creator Cheng, Zhongwen
Yu, Jinhao
Long, Bainian
Zeng, Lvming
Ji, Xuanrong
description Non-contact laser ultrasonic technique has been increasingly implemented for non-destructive inspections in harsh environments, high-temperature fields, and components having complex geometries. However, the poor signal-to-noise ratio and low amplitude of laser generated ultrasonic signals under a thermoelastic regime severely restrict its applications. Here, a sensitivity-enhanced all-optical probe was proposed for laser ultrasonic non-destructive testing. It consists of an optical sensor and an ellipsoidal acoustic cavity, where an optical sensor is placed at one focus of the cavity, and the detection point is set at another focus. The ultrasound signals are focused through the cavity and detected by the optical sensor. Side-by-side comparison experiments were carried out, and the results show that the probe can improve the signal amplitude by about 7.8 times compared to using a traditional optical sensor alone. The probe can make laser ultrasound detect defects with lower laser energy, which is of great significance to improve the efficiency of non-contact defect detection.
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source American Institute of Physics (AIP) Journals; Alma/SFX Local Collection
subjects Amplitudes
Applied physics
Defects
High temperature
Lasers
Nondestructive testing
Optical measuring instruments
Sensitivity enhancement
Sensors
Signal to noise ratio
Ultrasonic imaging
Ultrasonic methods
Ultrasonic testing
title A sensitivity-enhanced all-optical probe for non-contact laser ultrasonic inspection
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