CN105044016B - The glass fiber compound material defect inspection method of terahertz time-domain spectroscopic technology - Google Patents
The glass fiber compound material defect inspection method of terahertz time-domain spectroscopic technology Download PDFInfo
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Abstract
The invention discloses a kind of glass fiber compound material defect inspection methods of terahertz time-domain spectroscopic technology, this method is first popped one's head in THz wave and carries out scanning to sample with 0.1mm/ times~1 stepping of mm/ times, obtain the terahertz time-domain transmitted pulse of each scanning point of sample, obtained time domain transmitted pulse data are analyzed, obtain the time domain transmitted pulse amplitude of each scanning point of sample, to all sample time domain pulse amplitudesIt is compared, obtains the maximum value and minimum value of sample time domain pulse amplitude, by the pulse amplitude in obtained each sample spot, settingCorresponding grey scale value andCorresponding grey scale value acquires the corresponding gray value of images of sample spot i；The corresponding gray value of image of all samples point is calculated, ultimately generates the gray-scale map of sample.The present invention is detected composite material using transmission-type terahertz time-domain spectroscopy system, extracts time-domain spectroscopy data, and without obtaining frequency domain data, operating process is simple, and data acquisition is convenient.
Description
Technical field
The invention belongs to Terahertz field of non destructive testing, the glass fibre for being based especially on terahertz time-domain spectroscopic technology is answered
Condensation material defect inspection method.
Background technology
It is existing strong in itself to effectively improve raw material for the material that composite material is made of two or more elements
The deficiencies of spending the low physical characteristics such as low with fatigue resistance, and overcoming metal material not corrosion-resistant, instead of metal pressure container and
Pressure pipeline.Usually, composite material surface hardness and strength are all lower than metal material, by taking impact injury as an example, metal material
Material absorbs extraneous impact force by certain plastic deformations of impact site, and what composite material relied on is that the elastic of material becomes
Shape and damage and failure absorb energy, and damage mode is increasingly complex, and specific manifestation may generate a variety of simultaneously after the blow
Defect is such as layered, and is scratched, fibrous fracture etc..Traditional NDT of composite uses ultrasonic detection method more, but grasps
It is not accurate enough to make process complexity, defect location.Therefore, it is necessary to seek a kind of side easy to operate, defects detection is with obvious effects
Method solves the problems, such as composite material safety detection.
Terahertz time-domain spectroscopy (Terahertz time-domain spectroscopy, abbreviation THz-TDS) technology is
Far infrared band spectral measurement new technology based on ultrafast laser technique, using substance to the characteristic absorption analyte of THz radiation
The information such as matter ingredient, structure.The frequency range of THz wave is 0.1THz to 10THz, wavelength 0.3mm, in electromagnetic spectrum
Between microwave and infrared band.THz-TDS technologies are to develop more rapid non-destructive testing technology in recent years, to most
The all transparent property of number apolar substance, and with penetration capacity is strong, photon energy is low, can carry out time-resolved spectral measurement
Etc. characteristics.The advantages of based on tera-hertz spectra, the technology are with a wide range of applications in NDT of composite field.Profit
It is relatively fewer with the defect detection of composite materials method of terahertz imaging.
Invention content
In view of the deficiencies of the prior art, the present invention provides a kind of glass fibre composite woods of terahertz time-domain spectroscopic technology
Expect defect inspection method.
The glass fiber compound material defect inspection method of terahertz time-domain spectroscopic technology of the present invention, includes the following steps：
(1) under the conditions of at room temperature, Terahertz light path is covered in the babinet filled with nitrogen, and relative humidity is in babinet
4.0% hereinafter, the glass fiber sample of well cutting is placed on specimen holder, is 1000dB in signal-to-noise ratio, spectral resolution is more than
Under conditions of 40GHz, THz wave probe carries out scanning with the stepping of 0.1mm/ times~1mm/ times to sample, and it is each to obtain sample
The terahertz time-domain transmitted pulse of scanning point.
(2) the time domain transmitted pulse data that step (1) obtains are analyzed, the time domain for obtaining each scanning point of sample is saturating
Penetrate pulse amplitude Ii, to all sample time domain pulse amplitude IiIt is compared, obtains the maximum value of sample time domain pulse amplitude
Imax=max (I1,I2,I3…IN) and minimum value Imin=min (I1,I2,I3…IN), N is natural number.
(3) the pulse amplitude I in each sample spot obtained using step (2)i, set IminCorresponding grey scale value is Gray
(Imin)=0, ImaxCorresponding grey scale value Gray (Imax)=255, then the corresponding gray value of images of sample spot i be：
Gray(Ii)=255* (Ii-Imin)/(Imax-Imin)
The corresponding gray value of image of all samples point is calculated, ultimately generates the gray-scale map of sample.
Advantageous effect：Composite material is detected using transmission-type terahertz time-domain spectroscopy system, extracts time-domain spectroscopy
Data, without obtaining frequency domain data, operating process is simple, and data acquisition is convenient.Simultaneously using the method for image procossing, pass through one
The data of dimension obtain two dimensional image, improve the precision of defect detection of composite materials and reduce what composite material was detected
Difficulty.A kind of new trial is provided for glass fiber compound material defects detection, one is provided for existing non-destructive testing technology problem
A little references, improve the safe to use of glass fiber compound material, mostly a kind of choosing are provided for glass fiber compound material defects detection
It selects.
Description of the drawings
Fig. 1 is existing terahertz time-domain spectroscopy system construction drawing；
Fig. 2 is the terahertz pulse of A, B point in embodiment；
Fig. 3 is that the optics of glass fiber sample illustrates；
Fig. 4 is the imaging results of the present invention.
Specific embodiment
The glass fiber compound material defect inspection method of terahertz time-domain spectroscopic technology, includes the following steps：
(1) under the conditions of at room temperature, Terahertz light path is covered in the babinet filled with nitrogen, and relative humidity is in babinet
4.0% hereinafter, the glass fiber sample of well cutting is placed on specimen holder, is 1000dB in signal-to-noise ratio, spectral resolution is more than
Under conditions of 40GHz, THz wave probe carries out scanning with the stepping of 0.1mm/ times~1mm/ times to sample, and it is each to obtain sample
The terahertz time-domain transmitted pulse of scanning point.
(2) the time domain transmitted pulse data that step (1) obtains are analyzed, the time domain for obtaining each scanning point of sample is saturating
Penetrate pulse amplitude Ii, to all sample time domain pulse amplitude IiIt is compared, obtains the maximum value of sample time domain pulse amplitude
Imax=max (I1,I2,I3…IN) and minimum value Imin=min (I1,I2,I3…IN), N is natural number.
(3) the pulse amplitude I in each sample spot obtained using step (2)i, set IminCorresponding grey scale value is Gray
(Imin)=0, ImaxCorresponding grey scale value Gray (Imax)=255, then the corresponding gray value of images of sample spot i be：
Gray(Ii)=255* (Ii-Imin)/(Imax-Imin)
The corresponding gray value of image of all samples point is calculated, ultimately generates the gray-scale map of sample.
Of the present invention is transmission-type terahertz time-domain spectroscopy system, internal light path as shown in Figure 1, by the U.S.
The Terahertz system composition that the titanium sapphire femto-second laser of Coherent companies manufacture and Zomega companies of the U.S. develop.This is
System core component is Ti∶Sapphire laser femtosecond pulse laser, and centre wavelength 800nm, pulsewidth is less than 100fs, and repetition rate is
80MHz, output power 960mw.It is as shown in Figure 1 terahertz time-domain spectroscopy system construction drawing, experiment is at room temperature (about 292K)
It carries out, Terahertz light path is covered in the babinet filled with nitrogen, and relative humidity is 4.0% in case.During signal scanning, experiment
The signal-to-noise ratio of system is 1000dB, spectral resolution 43GHz.
The detecting step of glass fibre tramp metal defect sample as shown in Figure 3 is as follows：
(1) length × width × height of well cutting (mm)=25 × 20 × 5 glass fiber sample is placed on specimen holder, Terahertz
Wave probe carries out scanning with the stepping of 0.5mm/ times to sample, obtains the terahertz time-domain transmitted pulse of each scanning point of sample.
(2) the time domain transmitted pulse data that step (1) obtains are analyzed, the time domain for obtaining each scanning point of sample is saturating
Penetrate pulse amplitude Ii, to all sample time domain pulse amplitude IiIt is compared, obtains the maximum value of sample time domain pulse amplitude
Imax=max (I1,I2,I3…IN) and minimum value Imin=min (I1,I2,I3…IN), N is natural number.As shown in Fig. 2, for sample
Take up an official post and take the terahertz time-domain transmitted pulse amplitude I of two point A and BAAnd IB；
(3) the pulse amplitude I in each sample spot obtained using step (2)i, set IminCorresponding grey scale value is Gray
(Imin)=0, ImaxCorresponding grey scale value Gray (Imax)=255, then the corresponding gray value of images of sample spot i be：
Gray(Ii)=255* (Ii-Imin)/(Imax-Imin)
The corresponding gray value of image of all samples point is calculated, ultimately generates the gray-scale map of sample, as shown in Figure 4.
Claims (1)
1. the glass fiber compound material defect inspection method of terahertz time-domain spectroscopic technology, includes the following steps：
(1) under the conditions of at room temperature, Terahertz light path is covered in the babinet filled with nitrogen, in babinet relative humidity for 4.0% with
Under, the glass fiber sample of well cutting is placed on specimen holder, is 1000dB in signal-to-noise ratio, spectral resolution is more than the item of 40GHz
Under part, THz wave probe carries out scanning with the stepping of 0.1mm/ times~1mm/ times to sample, obtains each scanning point of sample
Terahertz time-domain transmitted pulse；
(2) the time domain transmitted pulse data that step (1) obtains are analyzed, obtains the time domain transmission arteries and veins of each scanning point of sample
Rush amplitude Ii, to all sample time domain pulse amplitude IiIt is compared, obtains the maximum value I of sample time domain pulse amplitudemax=
max(I1,I2,I3…IN) and minimum value Imin=min (I1,I2,I3…IN), N is natural number；
(3) the pulse amplitude I in each sample spot obtained using step (2)i, set IminCorresponding grey scale value is Gray (Imin)
=0, ImaxCorresponding grey scale value Gray (Imax)=255, then the corresponding gray value of images of sample spot i be：
Gray(Ii)=255* (Ii-Imin)/(Imax-Imin)
The corresponding gray value of image of all samples point is calculated, ultimately generates the gray-scale map of sample.
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| US10648937B2 (en) * | 2016-10-27 | 2020-05-12 | General Electric Company | Nondestructive inspection method for coatings and ceramic matrix composites |
| CN107356599B (en) * | 2017-06-23 | 2020-02-18 | 厦门大学 | Terahertz nondestructive testing method for ceramic matrix composite material |
| CN109211974B (en) * | 2018-08-07 | 2021-06-08 | 哈尔滨商业大学 | Pulse femtosecond laser infrared thermal wave detection device and method for debonding defect of thermal barrier coating |
| CN109102455B (en) * | 2018-08-27 | 2022-09-09 | 国网江苏省电力有限公司电力科学研究院 | Defect detection method, detection image generation method, system and storage device |
| CN109870460A (en) * | 2019-03-24 | 2019-06-11 | 哈尔滨理工大学 | A kind of composite material battery case surfaces quality determining method based on machine vision |
| CN110596142A (en) * | 2019-10-18 | 2019-12-20 | 云南电网有限责任公司电力科学研究院 | Terahertz imaging-based defect detection method and system |
| CN111220564B (en) * | 2019-12-31 | 2023-04-04 | 长春理工大学 | Terahertz detection optimization method for bonding pressurization parameters of multilayer structure |
| CN111272690B (en) * | 2019-12-31 | 2023-04-07 | 长春理工大学 | Terahertz characterization method for bonding and curing characteristics of organic adhesive |
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