High-sensitivity and large-area laser ultrasound imaging method
A technology of laser ultrasound and imaging methods, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, material analysis using sonic/ultrasonic/infrasonic waves, and material analysis by optical means, etc. The total amount of data is huge and the processing difficulty is high, so as to reduce the attenuation of multiple reflections, the image reconstruction algorithm is simple, and the data acquisition and transmission are fast.
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Embodiment 1
[0028] Example 1: See figure 1 ,Such as figure 1 A high-sensitivity large-area laser ultrasonic imaging system shown includes 1. a light source, 2. a collimator lens, 3. a microlens array, 4. a signal preprocessing module, 5. a computer, and 6. a sample to be tested.
[0029] A collimating lens 2 and a microlens array 3 are placed in sequence directly under the light source 1 ; the measured sample 6 is placed under the microlens array 3 .
[0030] The microlens array 3 , the signal preprocessing module 4 and the computer 5 are electrically connected in sequence; the light source 1 and the computer 5 are electrically connected in sequence.
[0031] Further, the light source 1 is a wavelength-tunable OPO laser (GWU, model versaScan / 120), with an optical pulse width of 10 ns, an operating wavelength of 410-2500 nm, and a maximum single pulse energy of 30 mJ; the array size of the microlens array 3 is 10mm*10mm, the diameter of the microlens array is 250um, the radius of curvatu...
Embodiment 2
[0034] The structure of this embodiment is similar to that of Embodiment 1, except that the light source 1 is a pulsed laser diode (Laser Components, model 905D4S16C), with an optical pulse width of 100 ns, an operating wavelength of 905 nm, and a peak power of 140 W.
[0035] The present invention also provides a method for imaging using the above-mentioned device, comprising the following steps:
[0036] S1: The light source 1 emits a pulsed or modulated light beam, which is collimated by the collimator lens 2, and then micro-focused and irradiated by the microlens array 3 on the tested sample 6 to generate a laser ultrasonic signal;
[0037] S2: The laser ultrasonic signal is received by each microlens array element of the microlens array 3 in the back mode, and after the signal preprocessing module 4, the extreme value of the laser ultrasonic signal is read and stored in the computer 6 by row and column addressing;
[0038] S3: The extreme value of the laser ultrasonic sig...
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