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A method for non-destructive measurement of elasticity using photoacoustic eigenspectral analysis

An analysis method and spectrum acquisition technology, which is applied in the field of non-destructive measurement of elasticity by using photoacoustic effect and optimization algorithm, to achieve the effect of convenient detection

Active Publication Date: 2019-06-04
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Atomic force microscopy is a technique that can accurately measure local elasticity, but it is limited to surface or subsurface detection of objects

Method used

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  • A method for non-destructive measurement of elasticity using photoacoustic eigenspectral analysis
  • A method for non-destructive measurement of elasticity using photoacoustic eigenspectral analysis
  • A method for non-destructive measurement of elasticity using photoacoustic eigenspectral analysis

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Embodiment Construction

[0035] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention All modifications of the valence form fall within the scope defined by the appended claims of the present application.

[0036] A method for non-destructively measuring elasticity by photoacoustic eigenspectrum analysis method, taking the elastic parameter of a brass ball with a diameter of 1.0mm as an example, specifically comprises the following steps:

[0037] Step 1, such as figure 1 As shown, a brass ball with a diameter of 1.0 mm is embedded in a cylinder-shaped agar to a depth of 2 cm, and the radius of the agar is about 2 cm. Use Nd:YAG pulsed laser to irradiate the elastic bo...

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Abstract

The invention discloses a method of nondestructive elasticity measurement by photoacoustic eigen spectrum analysis. The method provided by the invention utilizes laser pulse to irradiate an elastomer to make it radiate sound wave under the action of photoacoustic effect, and through analysis of the photoacoubtic signal radiated by the elastomer, a photoacoustic eigen spectrum of the elastomer can be obtained, the eigen frequency of the elastomer can be extracted from the photoacoustic eigen spectrum, on the basis of the eigen frequency, inversion algorithm is also utilized to evaluate the elastic properties of the elastomer. The method of nondestructive elasticity measurement by photoacoustic eigen spectrum analysis provided by the invention has no need for mutual contact of an acoustic transducer and the elastomer during measurement, and also has no need for any dissection treatment on the elastomer. The method can realize non-contact and nondestructive evaluation of elastic parameters, and has high safety and usability.

Description

technical field [0001] The invention relates to a method for non-destructive measurement of elastic properties, in particular to a method for non-destructive measurement of elasticity by using photoacoustic effect and optimization algorithm. Background technique [0002] Non-invasive and non-contact measurement of elasticity is not only the basic research content of materials science, but also has important significance in the field of biomedicine. Tissue elasticity is an important biomedical indicator in many diseases, including arteriosclerosis, liver cirrhosis, tumors, etc. Ultrasonic resonance spectroscopy can be used to measure the elasticity of objects, but generally requires the sample to be in contact with the measuring transducer. Atomic force microscopy is a technique that can accurately measure local elasticity, but it is limited to surface or subsurface detection of objects. [0003] Technologies based on the photoacoustic effect have attracted extensive attent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/17
CPCG01N21/1702G01N2021/1706
Inventor 陶超郜晓翔刘晓峻王学鼎
Owner NANJING UNIV