Infrared microscopic nondestructive testing method for fabric fibers

Abstract

An infrared microscopic nondestructive testing method for fabric fibers, comprising: instrument initialization; Fourier infrared spectrum detection; infrared microscopic imaging detection; and fabric fiber analysis. The method can perform precise infrared spectrum analysis and infrared broadband imaging while satisfying volume requirements, and perform pattern recognition and component analysis of fabric fibers by means of information fusion, to meet market regulatory requirements.

Description

A nondestructive testing method for textile fibers using infrared microscopy Technical Field

[0001] The present invention relates to the technical field of textile detection, and in particular to an infrared microscopic nondestructive detection method for textile fibers. Background Art

[0002] Fabrics come in a wide variety of types, including cotton, linen, wool / viscose, silk, viscose, and down. Fabric fiber testing is a key quality assessment indicator for textile inspection and a key component of clothing labeling. Testing for fabric fiber composition involves both qualitative and quantitative analysis, with the traditional method of qualitative analysis followed by quantitative analysis.

[0003] Qualitative analysis is to determine the type of fiber contained in the sample, usually referring to the fiber composition; quantitative analysis is to determine the amount of fiber contained, usually referring to the fiber content.

[0004] Currently, qualitative testing methods for textile fibers include microscopic observation, combustion, chemical dissolution, drug staining, melting point testing, and infrared absorption spectroscopy. However, these methods all have limitations. Microscopic observation and combustion can only distinguish natural or synthetic fibers. While chemical dissolution can identify blended products, the organic solvents used are harmful to the health of testers and pollute the environment. Infrared absorption spectroscopy requires very high test temperature, complex sample preparation, and long testing cycles, making it inadequate for rapid testing. Quantitative testing, however, places high demands on reagent concentration, test temperature, reaction time, equipment performance, and operator experience. Consequently, fiber composition testing is a complex process, and the results are subject to significant uncertainty.

[0005] Near-infrared spectroscopy (NIRS) is primarily used for non-destructive measurement of electromagnetic waves in the 800nm ​​to 2500nm range. Unlike mass spectrometry and chromatography, this technique requires no purification and has been widely used in the food, agriculture, pharmaceuticals, oil refining, and chemical industries. Qualitative analysis using NIRS involves establishing a NIRS identification model based on samples of known classes, then examining whether unknown samples belong to that class. It is primarily used for cluster analysis and discriminant analysis.

[0006] The existing technology lacks the ability to simultaneously acquire high-resolution infrared spectra and wide-spectrum infrared images to detect the texture of fabric fibers, such as the coarse weave and interweaving pattern, as well as joint detection technology for component analysis and pattern recognition. It is impossible to perform fine infrared spectral analysis of specific small areas, and it is impossible to perform joint detection of the interweaving pattern of the detection object within the field of view. Summary of the Invention

[0007] The purpose of the present invention is to provide an infrared microscopic non-destructive testing method for textile fibers in order to solve the problems in the prior art.

[0008] To this end, the above-mentioned purpose of the present invention is achieved through the following technical solutions:

[0009] An infrared microscopic nondestructive testing method for textile fibers, characterized in that: a textile fiber detector including a Fourier infrared spectrum detection optical path and an infrared microscopic imaging optical path is used for testing, wherein the Fourier infrared spectrum detection optical path includes an infrared light source, a beam splitter, a moving mirror, a static mirror, a second reflector with a hole, an first reflector with a hole, a cassette microscope objective lens, a cassette microscope image lens, and an infrared surface array; the orthogonal optical axis is perpendicular to the infrared optical axis; the beam splitter is placed at an angle of 45 degrees to the orthogonal optical axis; and a moving mirror mechanism controls the moving mirror to translate along the orthogonal optical axis.

[0010] The infrared microscopic imaging optical path and the Fourier infrared spectrum detection optical path multiplex an infrared light source, a perforated reflector B, a perforated reflector A, a cassette microscope objective lens, a cassette microscope image lens and an infrared outer array, and are further provided with an entry mirror and a total reflector. The entry mechanism controls the entry mirror to cut into or out of the infrared optical axis. When the entry mirror cuts into the infrared optical axis, the infrared microscopic imaging optical path works, and when the entry mirror cuts out of the infrared optical axis, the Fourier infrared spectrum detection optical path works. The infrared microscopic fabric detector is provided with a positioning cover, the size of which enables the fabric fiber sample to be located at the focal plane of the cassette microscope objective lens.

[0011] When the infrared microscopic fabric detector performs non-destructive testing on fabric fibers, the following steps are included:

[0012] Step 1: Turn on the infrared light source, send instructions to the moving mirror mechanism, set the scanning step size and start and end positions of the moving mirror along the orthogonal optical axis, and move the moving mirror to the starting position;

[0013] Step 2: Control the cutting mirror to cut out the infrared light axis, and start the infrared array working mode to the integration mode to perform Fourier infrared spectrum detection.

[0014] Step 3, controlling the cutting mirror to cut into the infrared optical axis, and starting the infrared outer array working mode to the imaging mode to perform infrared microscopic imaging detection;

[0015] Step 4: Perform spectral analysis on the reflectivity or infrared absorption of the fabric fiber sample to be tested obtained in step 2 to obtain the molecular composition and content in the fabric fiber; perform image processing and analysis on the infrared wide-spectrum image of the same fabric fiber sample to be tested obtained in step 3 to obtain the thickness and interweaving information of the fabric fiber, and assist in component determination and pattern recognition.

[0016] While adopting the above technical solutions, the present invention may also adopt or combine the following technical solutions:

[0017] As a preferred technical solution of the present invention: the infrared microscopic fabric detector controls the turning on of the infrared light source through the equipped controller, sends instructions to the moving mirror mechanism, controls the cutting mirror to cut into or out of the infrared light axis, and controls the working mode of the infrared outer array to be the integration mode or the imaging mode, and receives its data.

[0018] As a preferred technical solution of the present invention: Step 2 includes the following steps:

[0019] Step 2.1: Detect the intensity value of the reflection from the standard white plate at each wavelength within the wavelength range. The controller controls the moving mirror mechanism to move the mirror at a set scanning step size while performing Fourier transform infrared spectroscopy detection. Any position in the scan corresponds to a certain infrared wavelength. The scanning step size corresponds to the spectral resolution, and the start and end positions of the scan correspond to the starting and ending wavelengths of the infrared detection. When the moving mirror moves to the end position, the detection ends. The controller records the intensity value of the reflection from the standard white plate at each wavelength within the detection wavelength range.

[0020] Step 2.2, detect the intensity value of the reflection of the test fabric fiber sample at each wavelength within the wavelength range, replace the standard white board with the test fabric fiber sample, move the movable mirror in the opposite direction from the end position to the starting position with the same step length, and perform Fourier infrared spectrum detection at the same time. When the movable mirror moves to the starting position, the detection ends, and the controller records the intensity value of the reflection of the test fabric fiber sample at each wavelength within the detection wavelength range.

[0021] Step 2.3: Divide the reflection intensity value of the fabric fiber sample to be tested measured in step 2.2 by the reflection intensity value of the standard white board measured in step 2.1 to obtain the reflectivity distribution of the fabric fiber sample to be tested within the detection wavelength range.

[0022] As a preferred technical solution of the present invention: a controller is provided, which controls the turning on of the infrared light source, and controls the infrared array, specifies its working mode and receives its data.

[0023] As a preferred technical solution of the present invention: in the Fourier transform infrared spectroscopy detection optical path, the infrared light emitted by the infrared light source along the infrared optical axis is divided into two paths by the beam splitter: one path is reflected by the beam splitter and then emitted along the orthogonal optical axis to the moving mirror, reflected back by the moving mirror, and then passes through the beam splitter; the other path passes through the beam splitter, emitted along the infrared optical axis to the static mirror, reflected back by the static mirror, and then reflected by the beam splitter;

[0024] The moving mirror and the static mirror are at different distances from the center of the beam splitter, resulting in an optical path difference. The two infrared lights are coherent lights, and after merging, they form an equi-inclined interference ring distribution. During the translational scanning process of the moving mirror along the orthogonal optical axis, the center of the interference ring corresponds to the central main maximum infrared light intensity distribution of different wavelengths. After passing through the central hole of the perforated reflector B, only the central main maximum infrared light passes through, and then after being reflected by the perforated reflector A, it turns to the main optical axis perpendicular to the orthogonal optical axis, and then is focused to the fabric fiber sample on the focal plane through the cassette microscope objective. A part of the main maximum infrared light corresponding to a specific wavelength reflected by the fabric fiber sample is turned back along the main optical axis, passed through the cassette microscope objective, passed through the central hole of the perforated reflector A, and then focused onto the infrared array through the cassette microscope image lens;

[0025] The infrared array starts the integration mode under the control of the main controller, accumulates the intensity values ​​of all pixels, and records the accumulated intensity values.

[0026] As a preferred technical solution of the present invention: in the infrared microscopic imaging optical path, the wide-spectrum infrared light emitted by the infrared light source along the infrared optical axis is reflected by the cutting mirror and turned to the cutting optical axis perpendicular to the infrared optical axis, and then reflected by the total reflection mirror to turn to the turning optical axis parallel to the infrared optical axis, and after being reflected by the perforated reflector B and the perforated reflector A, it is turned to the main optical axis perpendicular to the orthogonal optical axis, and then is focused to the fabric fiber sample on the focal plane by the cassette microscope objective lens. The wide-spectrum infrared light reflected by the fabric fiber sample is returned along the main optical axis, passes through the cassette microscope objective lens, passes through the central hole of the perforated reflector A, and is then focused and imaged onto the infrared surface array by the cassette microscope. The infrared surface array starts the imaging mode under the control of the main controller and records the wide-spectrum infrared image for subsequent analysis.

[0027] As a preferred technical solution of the present invention: the card microscope contains an imaging secondary mirror and an imaging primary mirror, the card microscope objective contains an object side primary mirror and an object side secondary mirror, the card microscope and the card microscope objective are both designed for infinite imaging, and are coaxially symmetrically placed conjugately on the main optical axis. The card microscope objective first reflects the light emitted by the textile fiber sample on its focal plane successively by the object side primary mirror and the object side secondary mirror, and turns it into parallel light with a certain magnification, and then reflects it through the imaging secondary mirror and the imaging primary mirror of the card microscope, and the parallel light is reduced according to the magnification of the card microscope and focused to form an image onto the infrared surface array on the focal plane.

[0028] As a preferred technical solution of the present invention: the surfaces of the imaging secondary mirror, the imaging primary mirror, the object side primary mirror, the object side secondary mirror, the moving mirror, the static mirror, the cutting mirror, the perforated reflector B, and the perforated reflector A are all coated with an infrared high-reflection film, which efficiently reflects infrared light within the emission range of the infrared light source.

[0029] As a preferred technical solution of the present invention: different magnification ratios of the card microscope image lens and the card microscope objective lens are used to obtain different image-to-object magnification ratios on the infrared array.

[0030] As a preferred technical solution of the present invention: the beam splitter is formed by laminating two identical thin pieces of infrared high-transmittance optical glass, the laminating surface is coated with an infrared semi-reflective and semi-transparent film, and is placed at an angle of 45 degrees to the orthogonal optical axis.

[0031] As a preferred technical solution of the present invention: the fabric fiber detector uses a lithium battery as a driving power source.

[0032] As a preferred technical solution of the present invention: the fabric fiber detector is equipped with an operating handle for the operator to carry it.

[0033] The present invention has the following beneficial effects: an infrared microscopic nondestructive testing method for textile fibers of the present invention utilizes a Fourier infrared spectrum detection optical path, an infrared microscopic imaging optical path multiplexing infrared light source, a hole-carrying reflector B, a hole-carrying reflector A, a cassette microscope objective lens, a cassette microscope image lens and an infrared surface array, controls the cutting-in mirror to cut in or out of the infrared optical axis through a cutting-in mechanism, realizes switching between the infrared microscopic imaging optical path and the Fourier infrared spectrum detection optical path, obtains high-resolution infrared spectra and wide-spectrum infrared images of completely overlapping detection targets, realizes texture detection of coarse weaving, interweaving methods, etc. at the same position of textile fibers, and realizes comprehensive detection of fiber composition analysis and pattern recognition.

[0034] The infrared microscopic nondestructive testing method for fabric fibers of the present invention utilizes a multiplexed structure of a Fourier infrared spectrum detection optical path and an infrared microscopic imaging optical path, providing a method for preparing a more compact and miniaturized fabric fiber detector. By providing a positioning cover and the size of the positioning cover, the part to be tested can be quickly placed on the focal plane of the cassette microscope objective lens, thereby enabling faster inspection of the fabric. Thus, the present invention provides a compact and miniaturized fabric detector capable of rapid inspection.

[0035] The infrared microscopic nondestructive testing method for textile fibers of the present invention adopts two working modes, simultaneously performing precise infrared spectral analysis and infrared wide-spectrum imaging, and performing pattern recognition and component analysis of textile fibers through information fusion, which has great application prospects in the field of on-site textile fiber testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIG1 is a flow chart of the infrared microscopic nondestructive testing method for textile fibers of the present invention;

[0037] FIG2 is a structural diagram of a fabric fiber detector used in the infrared microscopic fabric fiber nondestructive testing method of the present invention;

[0038] In the accompanying drawings, the detector body 1; lithium battery 2; charging port 3; switch 4; power supply line 5; moving mirror 6; orthogonal optical axis 7; beam splitter 8; moving mirror mechanism 9; cutting mirror 10; cutting mechanism 11; main controller 12; infrared light source 13; operating handle 14; infrared optical axis 15; cutting optical axis 16; static mirror 17; total reflector 18; infrared surface array 19; cassette microscope 20; imaging secondary mirror 21; imaging primary mirror 22; turning optical axis 23; perforated reflector A 24; perforated reflector B 25; object side primary mirror 26; main optical axis 27; object side secondary mirror 28; textile fiber sample 29; positioning cover 30; cassette microscope objective lens 31. DETAILED DESCRIPTION

[0039] The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. Example 1

[0040] As shown in Figure 1, an infrared microscopic non-destructive testing method for textile fibers of the present invention adopts a textile fiber detector including a Fourier infrared spectrum detection optical path and an infrared microscopic imaging optical path for detection. The textile fiber detector includes a detector body 1, including a lithium battery 2, a moving mirror 6, a beam splitter 8, a moving mirror mechanism 9, an incision mirror 10, an incision mechanism 11, a main controller 12, an infrared light source 13, a static mirror 17, a total reflector 18, an infrared outer array 19, a cassette microscope 20, a perforated reflector A 24, a perforated reflector B 25 and a cassette microscope objective lens 31.

[0041] The card microscope 20 contains an imaging secondary mirror 21 and an imaging primary mirror 22. The card microscope objective lens 31 contains an object side primary mirror 26 and an object side secondary mirror 28. Both the card microscope 20 and the card microscope objective lens 31 are designed for infinite imaging and are placed coaxially symmetrically and conjugately on the main optical axis 27. The card microscope objective lens 31 first reflects the light emitted by the textile fiber sample 29 on its focal plane from the object side primary mirror 26 and the object side secondary mirror 28 in succession, and then converts it into parallel light with a certain magnification (the magnification of the card microscope objective lens 31, which is 20 in this embodiment). The parallel light is then reflected by the imaging secondary mirror 21 and the imaging primary mirror 22 of the card microscope 20, and the parallel light is reduced and focused according to the magnification of the card microscope 20, which is 5 in this embodiment, to form an image on the infrared array 19 on the focal plane. Different magnification ratios of the cassette microscope image lens 20 and the cassette microscope objective lens 31 can be selected to obtain different image-object magnification ratios on the infrared array 19. In this embodiment, the magnification ratio is 4.

[0042] The moving mirror mechanism 9 can control the moving mirror 6 to translate along the orthogonal optical axis 7. The cutting mechanism 11 can control the cutting mirror 10 to cut into or out of the infrared optical axis 15.

[0043] The infrared light source 13 emits a broad spectrum of infrared light within a certain range, in this embodiment, between 1000 cm⁻¹ and 3300 cm⁻¹. The corresponding infrared surface array 19 senses and forms an image of infrared light within this range. The surfaces of the imaging secondary mirror 21, imaging primary mirror 22, object primary mirror 26, object secondary mirror 28, moving mirror 6, static mirror 17, cutting mirror 10, perforated reflector B 25, and perforated reflector A 24 are all coated with a highly infrared reflective coating, effectively reflecting infrared light within the range emitted by the infrared light source 13.

[0044] The Fourier transform infrared spectroscopy detection optical path consists of an infrared light source 13, a beam splitter 8, a moving mirror 6, a static mirror 17, a perforated reflector B 25, a perforated reflector A 24, a cassette microscope objective 31, a cassette microscope image lens 20, and an infrared surface array 19. The orthogonal optical axis 7 is perpendicular to the infrared optical axis 15. The beam splitter 8 is formed by laminating two identical thin pieces of infrared high-transmittance optical glass, with the laminating surface coated with an infrared semi-reflective and semi-transmissive film. It is positioned at a 45-degree angle to the orthogonal optical axis 7. In the Fourier transform infrared spectroscopy detection mode, infrared light emitted by the infrared light source 13 along the infrared optical axis 15 is split into two paths by the beam splitter 8: one path is reflected by the beam splitter 8, then emitted along the orthogonal optical axis 7 toward the moving mirror 6, where it is reflected back by the moving mirror 6 and then passes through the beam splitter 8; the other path passes through the beam splitter 8, emitted along the infrared optical axis 15 toward the static mirror 17, where it is reflected back by the static mirror 17 and then reflected by the beam splitter 8. The moving mirror 6 and the static mirror 17 have different center distances to the beam splitter 8, resulting in an optical path difference. Therefore, the two infrared lights are coherent lights, and after merging, they form an equi-inclined interference ring distribution. When the moving mirror 6 is translated or scanned along the orthogonal optical axis 7, the center of the interference ring corresponds to the central main maximum infrared light intensity distribution of different wavelengths. At a certain detection moment, it is a certain wavelength value. After passing through the central hole of the perforated reflector B 25, only the central main maximum infrared light passes through, and then after being reflected by the perforated reflector A 24, it turns to the main optical axis 27 perpendicular to the orthogonal optical axis 7, and then is focused to the fabric fiber sample 29 on the focal plane through the cassette microscope objective lens 31. A part of the main maximum infrared light corresponding to a certain wavelength reflected by the fabric fiber sample 29 is turned back along the main optical axis 27, passed through the cassette microscope objective lens 31, passed through the central hole of the perforated reflector A 24, and then focused onto the infrared array 19 through the cassette microscope image lens 20. The infrared array 19 starts the integration mode under the control of the main controller 12, that is, accumulates the intensity values ​​of all pixels, which is equivalent to a unit detector, and records the accumulated intensity value.

[0045] The infrared microscopic imaging optical path and the Fourier transform infrared spectroscopy detection optical path reuse an infrared light source 13, a perforated reflector B 25, a perforated reflector A 24, a cassette microscope objective 31, a cassette microscope imager 20, and an infrared array 19. Furthermore, the optical path includes a cutting mirror 10 and a total reflector 18. When the cutting mirror 10, under the control of the cutting mechanism 11, cuts into the infrared optical axis 15, the infrared microscopic imaging optical path operates; conversely, when the cutting mirror 10, under the control of the cutting mechanism 11, cuts out of the infrared optical axis 15, the Fourier transform infrared spectroscopy detection optical path operates. In infrared microscopy imaging mode, the infrared light source 13 emits broad-spectrum infrared light along the infrared optical axis 15. This light is reflected by the entry mirror 10 and directed toward the entry optical axis 16, which is perpendicular to the infrared optical axis 15. It is then reflected by the total reflector 18 and directed toward the turning optical axis 23, which is parallel to the infrared optical axis 15. After being reflected by the apertured reflector B 25 and the apertured reflector A 24, it is directed toward the main optical axis 27, which is perpendicular to the orthogonal optical axis 7. The broad-spectrum infrared light is then focused by the cassette microscope objective 31 onto the fabric fiber sample 29 on the focal plane. The broad-spectrum infrared light reflected by the fabric fiber sample 29 is then reflected back along the main optical axis 27, passed through the cassette microscope objective 31, and passed through the center hole of the apertured reflector A 24. It is then focused by the cassette microscope imager 20 and imaged onto the infrared array 19. Under the control of the main controller 12, the infrared array 19 activates the imaging mode and records the broad-spectrum infrared image for subsequent analysis.

[0046] The lithium battery 2 has a charging port 3 and a switch 4. A battery charger can charge the lithium battery 2 through the charging port 3. When the switch 4 is turned on, the lithium battery 2 supplies power to the moving mirror mechanism 9, the cutting mechanism 11, the main controller 12, the infrared light source 13, and the infrared array 19 via the power supply line 5.

[0047] During on-site inspection, the operator lifts the operating handle 14 to make the positioning cover 30 close to the fabric fiber sample 29. The size of the positioning cover 30 can make the fabric fiber sample 29 be on the focal plane of the cassette microscope objective lens 31, which is convenient for on-site quick inspection.

[0048] The controller 12 is used to activate the infrared light source 13 and control the infrared array 19, specifying its operating mode and receiving its data. The controller 12 is also used to issue instructions to the moving mirror mechanism 9 and the cutting mechanism 11, thereby controlling the scanning step size and starting and ending positions of the moving mirror 6 along the orthogonal optical axis 7, and controlling the cutting mirror 10 to cut into and out of the infrared optical axis 15.

[0049] The present invention provides an infrared microscopic nondestructive testing method for textile fibers, which specifically comprises the following steps:

[0050] (1) Instrument initialization

[0051] Before on-site testing, charge the lithium battery 2 through the charging port 3. During on-site testing, the operator turns on the switch 4, and the lithium battery 2 powers the instrument. The controller 12 activates the infrared light source 13 and sends instructions to the moving mirror mechanism 9, setting the scanning step size and starting and ending positions for the translation of the moving mirror 6 along the orthogonal optical axis 7, and then moves the moving mirror 6 to the starting position.

[0052] (2) Fourier transform infrared spectroscopy detection

[0053] The controller 12 sends instructions to the cutting mechanism 11, controlling the cutting mirror 10 to cut out the infrared optical axis 15 and starting the infrared array 19 in the integration mode. The operator lifts the operating handle 14 to make the positioning cover 30 close to a standard whiteboard. The controller 12 sends instructions to the moving mirror mechanism 9 to control the moving mirror 6 to translate at a set scanning step length. At the same time, Fourier transform infrared spectroscopy detection is performed. At any position in the scan, a certain infrared wavelength corresponds to the scan step length. The spectral resolution corresponds to the spectral resolution, and the start and end positions of the scan correspond to the starting and ending wavelengths of the infrared detection. The detection ends when the moving mirror 6 translates to the end position. The controller 12 records the intensity value of the standard whiteboard reflection at each wavelength within the detection wavelength range, which in this embodiment is 1000 cm-1-3300 cm-1, that is, the spectral distribution of the infrared light source 13.

[0054] The standard whiteboard is replaced with a fabric fiber sample 29 to be tested. The movable mirror 6 moves in the opposite direction from the end position to the start position using the same step size, while simultaneously performing Fourier transform infrared spectroscopy. The detection ends when the movable mirror 6 reaches the start position. The controller 12 records the intensity values ​​reflected by the fabric fiber sample 29 to be tested at each wavelength within the detection wavelength range and divides these values ​​by the intensity value reflected by the standard whiteboard to obtain the reflectivity distribution of the fabric fiber sample 29 to be tested within the detection wavelength range.

[0055] (3) Infrared microscopic imaging detection

[0056] Controller 12 sends instructions to the cutting mechanism 11, controlling the cutting mirror 10 to cut into the infrared optical axis 15 and activating the infrared outer array 19 in imaging mode. Controller 12 records a broadband infrared image reflected by the fabric fiber sample 29 within the detection wavelength range. This image removes the interference of fabric fiber color, and the image texture contains information about the thickness and interweaving of the fabric fibers, while the image grayscale contains information about the composition of the fibers.

[0057] (4) Fabric fiber analysis

[0058] Spectral analysis of the reflectivity or infrared absorption of the fabric fiber sample 29 obtained in step 2 can reveal the molecular composition and content of the fabric fibers. Image processing and analysis of the infrared broadband image of the same fabric fiber sample 29 obtained in step 3 can reveal information about the thickness and interweaving of the fabric fibers, assisting in component determination and pattern recognition.

[0059] The present invention provides an infrared microscopic nondestructive testing method for textile fibers. This method utilizes a textile fiber detector equipped with a Fourier transform infrared spectroscopy detection optical path and an infrared microscopic imaging optical path. The instrument employs two operating modes: a Fourier transform infrared spectroscopy detection mode and a broadband infrared reflectance microscopic imaging mode. The infrared light source, infrared surface array, and cassette microscope imaging system are reused. While meeting certain volume requirements, the instrument simultaneously performs precise infrared spectroscopy analysis and broadband infrared imaging. Information fusion is used to perform pattern recognition and composition analysis of textile fibers, meeting market regulatory requirements.

[0060] The above-mentioned specific implementation methods are used to illustrate the present invention and are only preferred embodiments of the present invention, rather than limiting the present invention. Any modifications, equivalent substitutions, improvements, etc. made to the present invention within the spirit of the present invention and the scope of protection of the claims shall fall within the scope of protection of the present invention.

Claims

1. An infrared microscopic nondestructive testing method for textile fibers, characterized in that: The fabric fiber detector including the Fourier infrared spectrum detection optical path and the infrared microscopic imaging optical path is used for detection. The Fourier infrared spectrum detection optical path includes an infrared light source, a beam splitter, a moving mirror, a static mirror, a perforated reflector B, a perforated reflector A, a cassette microscope objective lens, a cassette microscope image lens and an infrared surface array. The orthogonal optical axis is perpendicular to the infrared optical axis. The beam splitter is placed at an angle of 45 degrees to the orthogonal optical axis. The moving mirror mechanism controls the moving mirror to translate along the orthogonal optical axis. The infrared microscopic imaging optical path and the Fourier infrared spectrum detection optical path multiplex an infrared light source, a perforated reflector B, a perforated reflector A, a cassette microscope objective lens, a cassette microscope image lens and an infrared surface array, and are also provided with a cutting-in mirror and a total reflecting mirror. The cutting-in mechanism controls the cutting-in mirror to cut in or out of the infrared optical axis. When the cutting-in mirror cuts in the infrared optical axis, the infrared microscopic imaging optical path works, and when the cutting-in mirror cuts out of the infrared optical axis, the Fourier infrared spectrum detection optical path works. The infrared microscopic fabric detector is provided with a positioning cover, and the size of the positioning cover makes the fabric fiber sample be on the focal plane of the cassette microscope objective lens. When the infrared microscopic fabric detector performs non-destructive testing on fabric fibers, the following steps are included: Step 1: Initialize the instrument, turn on the infrared light source, send instructions to the moving mirror mechanism, set the scanning step length and start and end positions of the moving mirror along the orthogonal optical axis, and move the moving mirror to the starting position; Step 2: Control the cutting mirror to cut out the infrared light axis, and start the infrared array in the integration mode to perform Fourier infrared spectrum detection. Step 3, controlling the cutting mirror to cut into the infrared optical axis, and starting the infrared outer array working mode to the imaging mode, and performing infrared microscopic imaging detection; Step 4, fabric fiber analysis, performing spectral analysis on the reflectivity or infrared absorption of the fabric fiber sample to be tested obtained in step 2 to obtain the molecular composition and content in the fabric fiber; performing image processing and analysis on the infrared wide-spectrum image of the same fabric fiber sample to be tested obtained in step 3 to obtain the thickness and interweaving information of the fabric fiber, and assist in component determination and pattern recognition.

2. The infrared microscopic nondestructive testing method for textile fibers according to claim 1, characterized in that: The infrared microscopic fabric detector controls the infrared light source to be turned on through the equipped controller, sends instructions to the moving mirror mechanism, controls the cutting mirror to cut in or out of the infrared light axis, controls the working mode of the infrared outer array to be the integration mode or the imaging mode, and receives its data.

3. The infrared microscopic nondestructive testing method for textile fibers according to claim 2, characterized in that: The step 2 comprises the following steps: Step 2.1, detecting the intensity value of the standard white plate reflection of each wavelength within the wavelength range, the controller controls the moving mirror mechanism, controls the moving mirror to translate with the set scanning step length, and performs Fourier infrared spectrum detection at the same time. Any position of the scan corresponds to a certain infrared wavelength, the scanning step length corresponds to the spectral resolution, and the start and end positions of the scan correspond to the start and end wavelengths of the infrared detection. When the moving mirror translates to the end position, the detection ends, and the controller records the intensity value of the standard white plate reflection of each wavelength within the detection wavelength range; Step 2.2, detect the intensity value of the reflection of the fabric fiber sample to be tested at each wavelength within the wavelength range, replace the standard white board with the fabric fiber sample to be tested, move the moving mirror in the opposite direction from the end position to the start position with the same step length, and perform Fourier infrared spectrum detection at the same time. When the moving mirror moves to the start position, the detection ends, and the controller records the intensity value of the reflection of the fabric fiber sample to be tested at each wavelength within the detection wavelength range. Step 2.3, dividing the reflection intensity value of the tested fabric fiber sample measured in step 2.2 by the reflection intensity value of the standard white board measured in step 2.1, to obtain the reflectivity distribution of the tested fabric fiber sample within the detection wavelength range.

4. The infrared microscopic nondestructive testing method for textile fibers according to claim 2, characterized in that: In step 3, the controller sends a command to the cutting mechanism to control the cutting mirror to cut into the infrared optical axis, and starts the infrared array to work in the imaging mode. The controller records the wide-spectrum infrared image reflected by the fabric fiber sample to be tested within the detection wavelength range. The image removes the color interference of the fabric fiber, the image texture contains the thickness and interweaving information of the fabric fiber, and the image grayscale contains the composition information.

5. The infrared microscopic nondestructive testing method for textile fibers according to claim 1, characterized in that: In the Fourier infrared spectrum detection optical path, the infrared light emitted by the infrared light source along the infrared optical axis is divided into two paths by the beam splitter: one path is reflected by the beam splitter and then emitted to the moving mirror along the orthogonal optical axis, reflected by the moving mirror and then passed through the beam splitter; the other path passes through the beam splitter, emitted to the static mirror along the infrared optical axis, reflected by the static mirror and then reflected by the beam splitter; The moving mirror and the static mirror have different center distances to the beam splitter, resulting in an optical path difference. The two infrared lights are coherent lights, and after merging, they form an equi-inclined interference ring distribution. When the moving mirror is moving and scanning along the orthogonal optical axis, the center of the interference ring corresponds to the central main maximum infrared light intensity distribution of different wavelengths. After passing through the central hole of the perforated reflector B, only the central main maximum infrared light passes through, and then after being reflected by the perforated reflector A, it turns to the main optical axis perpendicular to the orthogonal optical axis, and then is focused to the fabric fiber sample on the focal plane through the cassette microscope objective. A part of the main maximum infrared light corresponding to a specific wavelength reflected by the fabric fiber sample is folded back along the main optical axis, passes through the cassette microscope objective, passes through the central hole of the perforated reflector A, and then is focused to the infrared surface array through the cassette microscope image lens; The infrared array starts the integration mode under the control of the main controller, accumulates the intensity values ​​of all pixels, and records the accumulated intensity values.

6. The infrared microscopic nondestructive testing method for textile fibers according to claim 1, characterized in that: In the infrared microscope imaging optical path, the wide-spectrum infrared light emitted by the infrared light source along the infrared optical axis is reflected by the cutting-in mirror, turned to the cutting-in optical axis perpendicular to the infrared optical axis, and then reflected by the total reflection mirror to turn to the turning optical axis parallel to the infrared optical axis. After being reflected by the perforated reflector B and the perforated reflector A, it is turned to the main optical axis perpendicular to the orthogonal optical axis, and then focused to the fabric fiber sample on the focal plane by the cassette microscope objective. The wide-spectrum infrared light reflected by the fabric fiber sample is turned back along the main optical axis, passed through the cassette microscope objective, passed through the central hole of the perforated reflector A, and then focused and imaged onto the infrared surface array by the cassette microscope image lens. The infrared surface array starts the imaging mode under the control of the main controller and records the wide-spectrum infrared image for subsequent analysis.

7. The infrared microscopic nondestructive testing method for textile fibers according to claim 1, characterized in that: The cassette microscope image lens contains an imaging secondary mirror and an imaging primary mirror, and the cassette microscope objective lens contains an object side primary mirror and an object side secondary mirror. Both the cassette microscope image lens and the cassette microscope objective lens are designed for infinite imaging and are coaxially symmetrically placed conjugately on the main optical axis. The cassette microscope objective lens first reflects the light emitted by the fabric fiber sample on its focal plane through the object side primary mirror and the object side secondary mirror in turn, and turns it into parallel light with a certain magnification, and then reflects it through the imaging secondary mirror and the imaging primary mirror of the cassette microscope image lens, and reduces the parallel light according to the magnification of the cassette microscope image lens and focuses it to form an infrared surface array on the focal plane; Or, the surfaces of the imaging secondary mirror, the imaging primary mirror, the object primary mirror, the object secondary mirror, the moving mirror, the static mirror, the cutting mirror, the perforated reflector B, and the perforated reflector A are all coated with an infrared high-reflection film, which efficiently reflects infrared light within the emission range of the infrared light source.

8. The infrared microscopic nondestructive testing method for textile fibers according to claim 1, characterized in that: Different magnification ratios of cassette microscope image lenses and cassette microscope objective lenses are used to obtain different image-object magnification ratios on the infrared array.

9. The infrared microscopic nondestructive testing method for textile fibers according to claim 1, characterized in that: The beam splitter is made of two identical thin pieces of infrared high-transmittance optical glass bonded together. The bonding surface is coated with an infrared semi-reflective and semi-transparent film and is placed at an angle of 45 degrees to the orthogonal optical axis.

10. The infrared microscopic nondestructive testing method for textile fibers according to claim 1, characterized in that: The fabric fiber detector uses lithium batteries as the driving power source; The fabric fiber tester is equipped with an operating handle for the operator to carry it.

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