Efficiency enhancement and application of laser ultrasonic longitudinal wave based on glass constraint

Xing Guo; Youxing Chen; Youxing Chen; Xin Guo; Xin Guo; Jian Wang; Jian Wang; Yanqin Xun; Ya Li; Ya Li

doi:10.1364/AO.503210

Applied Optics
Vol. 62,
Issue 35,
pp. 9334-9342
(2023)
•https://doi.org/10.1364/AO.503210

Efficiency enhancement and application of laser ultrasonic longitudinal wave based on glass constraint

Xing Guo, Youxing Chen, Xin Guo, Jian Wang, Yanqin Xun, and Ya Li

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Xing Guo, Youxing Chen, Xin Guo, Jian Wang, Yanqin Xun, and Ya Li, "Efficiency enhancement and application of laser ultrasonic longitudinal wave based on glass constraint," Appl. Opt. 62, 9334-9342 (2023)

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Abstract

Due to the weak longitudinal signals generated by laser ultrasound in the thermoelastic mechanism, the characteristic echoes are weak when evaluating the interior of solids, thus limiting its application to internal defect detection. A glass confinement layer is introduced to enhance the longitudinal excitation effectiveness. Specially, a thermoelastic model of laser ultrasound with a glass confinement is established to explain the mechanism of the enhancement of the longitudinal wave effectiveness, and the effect of the glass width on the longitudinal wave generated by the base ultrasound is investigated. The effect of the glass confinement layer on the enhancement of the effectiveness of the internal defects detection is studied. The simulation and experimental results show that the longitudinal waves with high signal-to-noise ratio induced from thermoelastic effect are excited similar to the ablation mechanism, which greatly improves the excitation efficiency of the longitudinal waves. The deep detection defects and the accurate localization of depth information are realized with an error of no more than 1.2%.

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Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Characteristic	Glass	Aluminum
$D e n s i t y / (K g ∙ m^{- 3})$	2203	2700
Young modulus/(Pa)	$73.1 \times 109$	$70 \times 109$
Poisson’s ratio	0.17	0.33
Constant pressure heat $c a p a c i t y / (J ∙ {K g}^{- 1} ∙ K^{- 1})$	703	900
Heat $c o n d u c t i v i t y / (W ∙ m^{- 1} ∙ K^{- 1})$	1.38	238
Coefficient of thermal $e x p a n s i o n / (K^{- 1})$	$0.55 \times 10^{- 6}$	$23 \times 10^{- 6}$

Defect Depth	Defective Echo Arrival Time (µs)	Measured Defect Depth/mm	Error/%
10 mm	3.36	10.09	0.90
12 mm	3.98	12.05	0.42
14 mm	4.61	14.04	0.29
16 mm	5.24	16.01	0.06

Defect Depth	Defective Echo Arrival Time (µs)	Actual Arrival Time of Defective Echo (µs)	Measured Defect Depth/mm	Error/%	Standard Deviation (mm)
10 mm	3.75	3.52	9.88	1.20	0.0286
12 mm	4.35	4.12	11.96	0.33	0.0392
14 mm	4.96	4.73	14.02	0.14	0.0207
16 mm	5.58	5.35	16.07	0.43	0.0551

Characteristic	Glass	Aluminum
$D e n s i t y / (K g ∙ m^{- 3})$	2203	2700
Young modulus/(Pa)	$73.1 \times 109$	$70 \times 109$
Poisson’s ratio	0.17	0.33
Constant pressure heat $c a p a c i t y / (J ∙ {K g}^{- 1} ∙ K^{- 1})$	703	900
Heat $c o n d u c t i v i t y / (W ∙ m^{- 1} ∙ K^{- 1})$	1.38	238
Coefficient of thermal $e x p a n s i o n / (K^{- 1})$	$0.55 \times 10^{- 6}$	$23 \times 10^{- 6}$

Defect Depth	Defective Echo Arrival Time (µs)	Measured Defect Depth/mm	Error/%
10 mm	3.36	10.09	0.90
12 mm	3.98	12.05	0.42
14 mm	4.61	14.04	0.29
16 mm	5.24	16.01	0.06

Abstract

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Equations (1)

Applied Optics