Method of nondestructive elasticity measurement by photoacoustic eigen spectrum analysis

A technique of analysis and spectrum, applied in the field of non-destructive measurement of elasticity using photoacoustic effects and optimization algorithms to achieve the effect of convenient detection

Active Publication Date: 2017-03-15
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

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  • Method of nondestructive elasticity measurement by photoacoustic eigen spectrum analysis
  • Method of nondestructive elasticity measurement by photoacoustic eigen spectrum analysis
  • Method of nondestructive elasticity measurement by photoacoustic eigen spectrum analysis

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Embodiment Construction

[0035] In the following, the present invention will be further clarified with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are only used to illustrate the present invention and not to limit the scope of the present invention. After reading the present invention, those skilled in the art will understand various aspects of the present invention. Modifications of the price form all fall within the scope defined by the appended claims of this application.

[0036] A method for non-destructive measurement of elasticity using photoacoustic intrinsic spectrum analysis. Taking the measurement of the elastic parameters of a brass ball with a diameter of 1.0 mm as an example, it specifically includes 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 cylindrical agar with a depth of 2 cm and a radius of about 2 cm. The Nd:YAG pulsed laser is used to irradiate...

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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 nondestructive measurement of elastic properties, in particular to a method for nondestructive measurement of elasticity using photoacoustic effects and optimization algorithms. Background technique [0002] The 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. In many diseases, including arteriosclerosis, liver cirrhosis, tumors, etc., tissue elasticity is an important biomedical index. Ultrasonic resonance spectroscopy can be used to measure the elasticity of objects, but in general, the sample needs to be in contact with the measuring transducer. Atomic force microscopy is a technique that can accurately measure local elasticity, but it is only limited to the surface or subsurface detection of objects. [0003] Technology based on the photoacoustic effect has attracted widespread attentio...

Claims

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Application Information

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