Glass fiber composite defect detecting method based on terahertz time-domain spectroscopy

A technology of terahertz time domain and glass fiber, which is applied in the direction of optical testing of flaws/defects, material analysis through optical means, and material analysis. Ease of acquisition and improved safety of use

Active Publication Date: 2015-11-11
开地(江苏)信息技术研究院有限公司
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Problems solved by technology

The traditional non-destructive testing of composite materials mostly uses ultrasonic testin...

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  • Glass fiber composite defect detecting method based on terahertz time-domain spectroscopy
  • Glass fiber composite defect detecting method based on terahertz time-domain spectroscopy
  • Glass fiber composite defect detecting method based on terahertz time-domain spectroscopy

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Embodiment Construction

[0016] The glass fiber composite material defect detection method of the terahertz time-domain spectroscopy technology comprises the following steps:

[0017] (1) Under room temperature conditions, the terahertz optical path is covered in a box filled with nitrogen, and the relative humidity in the box is below 4.0%. The cut glass fiber sample is placed on the sample holder, and the signal-to-noise ratio is 1000dB. Under the condition that the spectral resolution exceeds 40 GHz, the terahertz wave probe scans the sample at a step of 0.1mm / time to 1mm / time, and obtains the terahertz time-domain transmission pulse of each scanning point of the sample.

[0018] (2) Analyze the time-domain transmission pulse data obtained in step (1) to obtain the time-domain transmission pulse amplitude I of each scan point of the sample i , for all samples the time-domain pulse amplitude I i For comparison, the maximum value I of the sample time-domain pulse amplitude is obtained max =max(I 1...

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Abstract

The invention discloses a glass fiber composite defect detecting method based on terahertz time-domain spectroscopy. The method comprises the following steps: firstly, using a terahertz wave probe to scan a sample with the stepping frequency of 0.1mm/each time to 1mm/each time so as to obtain the terahertz time-domain transmission pulse of each scanning point of the sample; then analyzing the obtained time-domain transmission pulse data so as to obtain the time-domain transmission pulse amplitude Ii of each scanning point of the sample; comparing the time-domain pulse amplitude Ii of all samples so as to obtain the maximal value and the minimum value of the time-domain pulse amplitude of the sample; setting Imin corresponding gray value and Imax corresponding gray value for the obtained pulse amplitude Ii of each sample point, and solving the corresponding image gray value of the sample point i; and calculating the corresponding image gray values of all sample points so as to generate the gray-scale map of the sample. According to the invention, a transmission type terahertz time-domain spectral system is adopted to detect the composite material to extract the time-domain spectral data without the need of obtaining frequency domain data, the operation procedure is simple, and data acquisition is convenient.

Description

technical field [0001] The invention belongs to the field of terahertz non-destructive testing, in particular to a glass fiber composite material defect detection method based on terahertz time-domain spectroscopy technology. Background technique [0002] Composite materials are materials composed of two or more elements, which effectively improve the physical properties of raw materials such as low strength and low fatigue resistance, and overcome the shortcomings of metal materials such as corrosion resistance, replacing metal pressure vessels and Pressure piping. Generally speaking, the surface hardness and strength of composite materials are lower than those of metal materials. Taking impact damage as an example, metal materials rely on some plastic deformation of the impact part to absorb external impact force, while composite materials rely on the elastic deformation and To absorb energy through damage and destruction, the damage mode is more complex, specifically man...

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Application Information

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IPC IPC(8): G01N21/3586G01N21/3563G01N21/95
Inventor 王强郭小弟谷小红廖晓玲
Owner 开地(江苏)信息技术研究院有限公司
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