Portable acquisition device for near-infrared diffuse reflection spectrum of insulation paper

Abstract

The invention provides a portable acquisition device for a near infrared diffuse reflection spectrum of insulation paper, which belongs to the technical field of spectrum acquisition and comprises a main shell, a cylindrical surface accessory, a handle with a built-in cavity and a first optical fiber channel, one end of the handle is communicated with the bottom of the rear end of the main shell; two ends of the first optical fiber channel are respectively communicated with the bottom of the front end of the main shell and the other end of the handle; a main light outlet is formed in the center of the front end of the main shell; an integrating sphere and a halogen lamp light source are arranged in the main shell; one light outlet of the integrating sphere is communicated with the main light outlet, and the other light outlet of the integrating sphere is connected with an external spectrograph through a first optical fiber arranged in the first optical fiber channel; the light inlet and the halogen lamp light source are connected through a collimating mirror and a second optical fiber; a groove body is formed in one end face of the cylindrical accessory; and the cylindrical surface accessory is provided with a light channel communicated with the main light outlet along the axis direction. The light outlet of the acquisition device can be switched into a cylindrical surface, so that the light outlet can be perfectly attached to the outer surface of field insulation paper.

Description

Technical Field

[0001] The invention relates to the technical field of near-infrared spectrum collection devices, and in particular to a portable collection device for near-infrared diffuse reflection spectrum of insulating paper. Background Art

[0002] The main insulation of power transformers is oil-paper insulation, which is composed of insulating paper and insulating oil. Its aging state determines whether the equipment can operate stably. Among them, the aging state of insulating oil can be reversed by filtering impurities and changing oil in time, while insulating paper is difficult to replace, and its aging state determines the insulation life of the transformer. Near-infrared spectroscopy analysis technology is a non-destructive, rapid and efficient detection technology, which can be used as an advantageous alternative to traditional quantitative evaluation methods for the aging state of insulating paper. To apply near-infrared spectroscopy analysis technology to the quantitative evaluation of the aging state of insulating paper, it is first necessary to obtain the near-infrared spectrum and degree of polymerization of insulating paper with different aging times, and then use chemometric methods to establish a correlation model between the near-infrared spectrum of insulating paper and the degree of polymerization. Therefore, it can be considered that the quality of spectral data directly affects the accuracy of near-infrared spectroscopy analysis.

[0003] There are two main methods for collecting near-infrared spectra: transmission and reflection. When collecting near-infrared spectra of samples, different collection accessories are needed to adapt to different types of samples due to the various physical states and shapes of the samples. Due to the low transparency of insulating paper, the spectrum collection method of insulating paper is mainly diffuse reflection. Among the various diffuse reflection collection accessories, the use of an integrating sphere for spectrum collection is convenient. You only need to place the light outlet surface of the integrating sphere close to the surface of the sample to be measured. Moreover, the spectrum collected by the integrating sphere has the advantages of high signal-to-noise ratio and good repeatability. Therefore, it is widely used in the collection of insulating paper spectra.

[0004] However, in field applications, the insulating paper of the transformer is tightly attached to structures such as windings, resulting in the outer surface of the insulating paper being a cylindrical surface. When collecting the spectrum of the insulating paper, the light outlet surface of the existing integrating sphere is flat and cannot perfectly fit the outer surface of the insulating paper, resulting in serious light leakage at the light outlet of the integrating sphere, which seriously affects the quality of the collected spectrum and, in turn, affects the accuracy of the quantitative assessment of the aging state of the insulating paper. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes a portable collection device for near-infrared diffuse reflectance spectrum of insulating paper. The light outlet of the collection device can be switched to a cylindrical surface to achieve perfect fit with the outer surface of the insulating paper on site.

[0006] The present invention provides the following technical solutions:

[0007] A portable collection device for near-infrared diffuse reflectance spectrum of insulating paper, comprising a main shell, a cylindrical attachment, a handle with a built-in cavity, and a first optical fiber channel; one end of the handle is connected to the bottom of the rear end of the main shell; the two ends of the first optical fiber channel are respectively connected to the bottom of the front end of the main shell and the other end of the handle; a main light outlet is arranged at the center of the front end of the main shell;

[0008] An integrating sphere and a halogen lamp light source are sequentially arranged in the main housing along the length direction; the integrating sphere has a light inlet and two light outlets, one of which is in communication with the main light outlet and has the same diameter as the main light outlet, and the other light outlet is connected to an external spectrometer via a first optical fiber arranged along the first optical fiber channel; the light inlet and the halogen lamp light source are connected via a collimator and a second optical fiber;

[0009] One end face of the cylindrical attachment is provided with a groove body which is sleeved with the front end of the main shell, and the other end has a cylindrical surface with a typical curvature radius consistent with the outer surface of the insulating paper of the power transformer; the cylindrical attachment is provided with an optical channel which is connected with the main light outlet and has the same diameter along the axial direction.

[0010] Preferably, a first positioning mark is arranged above the external front end of the main shell, and a second positioning mark is arranged at the external upper end of the cylindrical attachment, and the first positioning mark and the second positioning mark are of the same size; the axis of the cylindrical surface is in the direction of the second positioning mark.

[0011] Preferably, the cylindrical surface of the cylindrical surface attachment is a flexible shading plate; the middle portion of the flexible shading plate is fixedly connected to the other end of the cylindrical surface attachment, and is provided with a light outlet that is in communication with the light channel of the cylindrical surface attachment and has the same diameter; one end surface of the flexible shading plate close to the cylindrical surface attachment is provided with two telescopic rods between the flexible shading plate and the cylindrical surface attachment;

[0012] The telescopic rod includes a screw, a nut, a sleeve and two frame plates; the two frame plates are fixedly arranged on the other end surface of the cylindrical attachment; the lower end of the sleeve is rotatably connected to the two frame plates through a rotating shaft; the nut is rotatably connected to the upper end of the sleeve, and the screw passes through the nut and the sleeve in turn, is threadedly connected to the nut, and slidably cooperates with the sleeve; one end of the screw is fixedly connected to the flexible sunshade through a fixing ball.

[0013] Preferably, the inner wall of the integrating sphere and the inner walls of the light outlet and light inlet, the inner wall of the main light outlet at the front end of the main shell, and the inner wall of the cylindrical accessory light channel are all coated with white polytetrafluoroethylene or barium sulfate coating.

[0014] Preferably, the first optical fiber and the second optical fiber are both near-infrared quartz optical fibers.

[0015] Preferably, the axis of the light inlet of the inner wall of the integrating sphere coincides with or forms an angle of 0.3° with the axis of the light outlet of the main housing.

[0016] Preferably, a heat dissipation fan is provided at the rear end of the interior of the main shell; and a plurality of heat dissipation holes are provided at the top of the rear end of the exterior of the main shell.

[0017] Preferably, a switch is provided at the lower end of the cooling fan; a circuit board is fixed inside the handle, and the circuit board is electrically connected to the halogen lamp light source, the cooling fan and the switch; the circuit board is electrically connected to a power cord; an opening is provided at the lower end of the handle, and the power cord and the first optical fiber pass through the opening.

[0018] Preferably, the groove of the cylindrical surface attachment is provided with an internal thread; the front end of the main shell is provided with an external thread; the cylindrical surface attachment is matched with the front end thread of the main shell.

[0019] Preferably, a protective cover is further included; the inner side of the protective cover is provided with an internal thread that matches the front end thread of the main shell.

[0020] Beneficial effects of the present invention:

[0021] The present invention provides a portable collection device for near-infrared diffuse reflectance spectrum of insulating paper. The light outlet surface of the collection device can be switched between a plane and a cylindrical surface. The switching of the light outlet surface is achieved by a cylindrical surface accessory. The surface curvature radius of the cylindrical surface accessory is consistent with the typical curvature radius of the outer surface of the insulating paper of the power transformer. The problem that in field applications, the outer surface of the insulating paper is a cylindrical surface, and the light outlet surface of the existing integrating sphere is a plane, which cannot perfectly fit the outer surface of the insulating paper, resulting in serious light leakage at the light outlet of the integrating sphere, seriously affecting the quality of the collected spectrum, is solved, thereby improving the quality of the spectral data. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a cross-sectional view of the present invention cut along the middle symmetry plane;

[0024] Figure 3 is a cross-sectional view of a cylindrical attachment cut along a symmetry plane in Example 1 of the present invention;

[0025] Figure 4 is a cross-sectional view of the protective cover of Embodiment 1 of the present invention cut along the symmetry plane;

[0026] Figure 5 It is a schematic diagram of the three-dimensional structure of the cylindrical surface attachment of Example 2 of the present invention;

[0027] Figure 6It is a schematic diagram of the three-dimensional structure of the cylindrical surface attachment of Embodiment 2 of the present invention from another angle;

[0028] Figure 7 It is a schematic diagram of the partial structure A of the cylindrical surface attachment of Example 2 of the present invention.

[0029] In the figure, 1. main shell; 2. handle; 3. first optical fiber channel; 4. integrating sphere; 5. collimator; 6. halogen lamp light source; 7. cooling fan; 8. switch; 9. circuit board; 10. first positioning mark; 11. first optical fiber; 12. second optical fiber; 13. power cord; 14. cylindrical attachment; 141. second positioning mark; 142. flexible sunshade; 143. fixing ball; 144. screw; 145. nut; 146. frame; 147. rotating shaft; 148. sleeve; 15. protective cover. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0033] Example 1

[0034] This embodiment proposes a portable device for collecting near-infrared diffuse reflectance spectra of insulating paper, such as Figure 1 and Figure 2 As shown, Figure 1 is a schematic diagram of the overall structure of this embodiment, Figure 2It is a cross-sectional view of the present embodiment taken along the middle symmetry plane, comprising a main shell 1, a cylindrical attachment 14, a handle 2 with a built-in cavity and a first optical fiber channel 3; one end of the handle 2 is connected to the bottom of the rear end of the main shell 1; the two ends of the first optical fiber channel 3 are respectively connected to the bottom of the front end of the main shell 1 and the other end of the handle 2; a main light outlet is arranged at the center of the front end of the main shell 1; an integrating sphere 4 and a halogen lamp light source 6 are sequentially arranged in the main shell 1 along the length direction; the integrating sphere 4 has a light inlet and two light outlets, one of which is connected to the main light outlet and has the same diameter, and the other light outlet is connected to an external spectrometer via a first optical fiber 11 arranged along the first optical fiber channel 3; the light inlet and the halogen lamp light source 6 are connected via a collimator 5 and a second optical fiber 12. The collection principle is as follows: the near-infrared light emitted by the halogen light source 6 passes through the second optical fiber 12 and the collimator 5 in turn into the integrating sphere 4, and then irradiates the surface of the insulating paper through the light outlet of the collection device. The diffusely reflected near-infrared light is evenly reflected multiple times by the inner wall of the integrating sphere 4, and then passes through the first optical fiber 11 into the near-infrared spectrometer, thus completing the collection of the near-infrared diffuse reflection spectrum of the insulating paper. Among them, the function of the collimator 5 is to shape the light beam, converting the divergent light source into a parallel light source, so that the beam diameter can match the light outlet diameter of the integrating sphere 4.

[0035] like Figure 3 As shown, Figure 3 It is a cross-sectional view of the cylindrical accessory 14 cut along the symmetry plane. One end face of the cylindrical accessory 14 is provided with a groove body that is sleeved with the front end of the main shell 1, and the other end has a cylindrical surface that is consistent with the typical curvature radius of the outer surface of the insulating paper of the power transformer; the cylindrical accessory 14 is provided with an optical channel with the same diameter as the main light outlet along the axial direction. Preferably, in order to ensure stable installation, the groove body of the cylindrical accessory 14 is provided with an internal thread; the front end of the main shell 1 is provided with an external thread; the cylindrical accessory 14 is matched with the front end thread of the main shell 1. Among them, the cylindrical accessory 14 can be removed when the collection device is used in the laboratory. In addition, in order to protect the entire collection device, it also includes a protective cover 15, which is used to block the light outlet when the collection device is not in use, so as to prevent dust, moisture and other pollutants from entering the integrating sphere 4 and affecting the repeatability and consistency of the collected spectrum. When the collection device is not in use, the protective cover 15 is covered, and when it is used, the protective cover 15 is removed. Figure 4 As shown, Figure 4 This is a cross-sectional view of the protective cover cut along a symmetric plane. The inner side of the protective cover 15 is provided with an internal thread that matches the front end thread of the main housing 1 .

[0036] In order to determine the relative position between the cylindrical surface attachment 14 and the main housing 1, it is convenient to position the cylindrical surface attachment 14 on the main housing 1, such as Figure 3As shown, a first positioning mark 10 is provided above the external front end of the main housing 1, and a second positioning mark 141 is provided at the external upper end of the cylindrical surface attachment 14. The first positioning mark 10 and the second positioning mark 141 are of the same size; the axis of the cylindrical surface is in the direction of the second positioning mark 141. When the first positioning mark 10 and the second positioning mark 141 are aligned in the center, the near-infrared diffuse reflectance spectrum of the insulating paper can be collected on site.

[0037] In this embodiment, the diameter of the integrating sphere 4 is set to 50 mm, the diameter of the light outlet on the inner wall of the integrating sphere 4 communicating with the front end of the first optical fiber channel 3 is set to 4 mm, and the axis of the light inlet on the inner wall of the integrating sphere 4 forms an angle of 8° with the axis of the main light outlet of the main housing 1. The diameters of the light outlet of the cylindrical attachment 14, the main light outlet at the front end of the main housing 1, the light outlet on the inner wall of the integrating sphere 4 communicating with the front end of the main housing 1, and the light inlet on the inner wall of the integrating sphere 4 are all set to 10 mm.

[0038] The inner wall of the integrating sphere 4, the inner wall of the light outlet and the inner wall of the light inlet, the inner wall of the light outlet at the front end of the main housing 1, and the inner wall of the light outlet of the cylindrical attachment 14 are all coated with a white polytetrafluoroethylene coating with high diffuse reflectivity, and the coating thickness is 0.8mm. The surface curvature radius of the cylindrical attachment 14 is set to 498mm, which is consistent with the curvature radius of the outer surface of the insulating paper of a 110kV power transformer. The shape of the heat dissipation holes is set to be rectangular, with a total of 10.

[0039] The interfaces of the first optical fiber and the second optical fiber are both SMA905 interfaces, the interface of the power line is 5521 interface, the first optical fiber 11 and the second optical fiber 12 are both near-infrared quartz optical fibers, which have good transmission performance for near-infrared light. The power of the halogen light source is selected to be 5W.

[0040] The main housing 1, the handle 2, the first optical fiber channel 3, the integrating sphere 4, the protective cover 15, and the cylindrical attachment 14 are all made of aluminum alloy to assist the heat dissipation of the collection device.

[0041] The main housing is connected to the handle and the first optical fiber channel by bolts, and the main housing is connected to the integrating sphere, the halogen light source, and the cooling fan by screws. A switch 8 is provided at the lower end of the cooling fan 7; a circuit board 9 is fixed inside the handle 2, and the circuit board 9 is electrically connected to the halogen light source 6, the cooling fan 7, and the switch 8; the circuit board 9 is electrically connected to a power cord 13; an opening is provided at the lower end of the handle 2, and the power cord 13 and the first optical fiber 11 pass through the opening. The end of the power cord 13 is connected to a DC power supply to power the acquisition device. Among them, the switch 8 is used to control the opening and closing of the halogen light source 6 and the cooling fan 7. The circuit board 9 plays the role of power distribution, control and management, and protection circuit in the circuit system, ensuring the normal operation of the halogen light source 6 and the cooling fan 7 and the overall stability of the circuit system.

[0042] For the collection of near-infrared diffuse reflectance spectra of on-site power transformer insulation paper:

[0043] S1: Connect the first optical fiber to the near-infrared spectrometer, and connect the power cord to the DC power supply.

[0044] S2: Remove the protective cover 15, install the cylindrical attachment 14 that matches the radius of curvature of the outer surface of the insulating paper of the power transformer being tested, and align the second positioning mark 141 on the cylindrical attachment 14 with the center of the first positioning mark 10 on the main shell 1.

[0045] S3: Turn on switch 8 and complete corresponding operations such as calibration and dark noise removal according to the actual requirements of the near-infrared spectrometer.

[0046] S4: The surface of the cylindrical attachment 14 is fitted with the outer surface of the power transformer insulation paper, and then the spectrum preservation, processing and other operations are completed in the actual near-infrared spectrometer, thereby completing the collection of the near-infrared diffuse reflectance spectrum of the power transformer insulation paper on site.

[0047] For the collection of near-infrared diffuse reflectance spectra of laboratory power transformer insulation paper samples:

[0048] S1: Connect the first optical fiber 11 to the near-infrared spectrometer, and connect the power line 13 to the DC power supply.

[0049] S2: Remove the protective cover 15, turn on the switch 8, and complete corresponding calibration, dark noise removal and other operations according to the actual requirements of the near-infrared spectrometer.

[0050] S3: The light outlet surface of the main shell 1 is fitted with the surface of the power transformer insulation paper sample, and then the spectrum preservation, processing and other operations are completed in the actual near-infrared spectrometer, thereby completing the collection of the near-infrared diffuse reflectance spectrum of the laboratory power transformer insulation paper sample.

[0051] Embodiment 2:

[0052] like Figure 5-Figure 7 As shown, Figure 5 and Figure 6 The cylindrical attachment 14 is shown in two different viewing angles. Figure 7It is a partial structural diagram of A. The cylindrical surface of the cylindrical surface attachment 14 is a flexible shading plate 142; the middle part of the flexible shading plate 142 is fixedly connected to the other end of the cylindrical surface attachment 14, and is provided with a light outlet that is in communication with the light channel of the cylindrical surface attachment 14 and has the same diameter as that of the cylindrical surface attachment 14; one end surface of the flexible shading plate 142 close to the cylindrical surface attachment 14 is provided with two telescopic rods between the cylindrical surface attachment 14 and the flexible shading plate 142. The telescopic rod includes a screw 144, a nut 145, a sleeve 148 and two frame plates 146; the two frame plates 146 are fixedly arranged on the other end surface of the cylindrical attachment 14; the lower end of the sleeve 148 is rotatably connected to the two frame plates 146 through a rotating shaft 147; the nut 145 is rotatably connected to the upper end of the sleeve 148, the screw 144 passes through the nut 145 and the sleeve 148 in turn, is threadedly connected to the nut 145, and is slidably matched with the sleeve 148; one end of the screw 144 is fixedly connected to the flexible sunshade 142 through a fixing ball 143.

[0053] The screw 144 can be controlled to move in the sleeve 148 by rotating the nut 145, and its end pushes or pulls the flexible shading plate 142 to form an arc surface with a certain curvature radius. The two sides of the flexible shading plate 142 cooperate with each other to form a cylindrical surface, which can adapt to the outer surface of the power transformer insulation paper with different curvature radii.

[0054] In this embodiment, the light outlet surface of the acquisition device can be switched between a plane and a cylindrical surface, and the curvature radius can also be adjusted. When the cylindrical surface attachment 14 is installed, the light outlet surface is switched from a plane to a cylindrical surface. The surface curvature radius of the cylindrical surface attachment 14 is consistent with the typical curvature radius of the outer surface of the insulating paper of the power transformer. The cylindrical surfaces with different curvature radii are formed by the flexible shading plate 142 to adapt to power transformers of different voltage levels during on-site detection.

[0055] In this embodiment, the light outlet surface of the acquisition device can be switched between a plane and a cylindrical surface, and the switching of the light outlet surface is achieved by the equipped cylindrical surface attachment 14, and the surface curvature radius of the cylindrical surface attachment 14 is consistent with the typical curvature radius of the outer surface of the power transformer insulation paper. The problem that in field applications, the outer surface of the insulation paper is a cylindrical surface, and the light outlet surface of the existing integrating sphere 4 is a plane, which cannot perfectly fit the outer surface of the insulation paper, resulting in serious light leakage at the light outlet of the integrating sphere 4, which seriously affects the quality of the collected spectrum, is solved, and the quality of the spectrum data is improved.

[0056] When the light outlet surface of the acquisition device is a cylindrical surface, it is suitable for collecting the near-infrared diffuse reflectance spectrum of the insulation paper of the power transformer on site; when the light outlet surface of the acquisition device is a plane, it is suitable for collecting the near-infrared diffuse reflectance spectrum of the insulation paper of the power transformer in the laboratory. Therefore, the acquisition device can be used not only for collecting the near-infrared diffuse reflectance spectrum of the insulation paper of the power transformer on site, but also for collecting the near-infrared diffuse reflectance spectrum of the insulation paper of the power transformer in the laboratory, realizing multiple uses of one machine and improving the utilization rate of the equipment.

[0057] In addition, the collection device is designed with a handle 2, which solves the problem that the existing integrating sphere 4 is mostly rectangular or cylindrical and is inconvenient for human hands to hold during on-site testing, thereby improving the portability of the collection device.

[0058] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A portable collection device for near-infrared diffuse reflectance spectrum of insulating paper, characterized in that: It comprises a main housing (1), a cylindrical attachment (14), a handle (2) with a built-in cavity, and a first optical fiber channel (3); one end of the handle (2) is connected to the bottom of the rear end of the main housing (1); the two ends of the first optical fiber channel (3) are respectively connected to the bottom of the front end of the main housing (1) and the other end of the handle (2); a main light outlet is provided at the center of the front end of the main housing (1); An integrating sphere (4) and a halogen lamp light source (6) are sequentially arranged in the main housing (1) along the length direction; the integrating sphere (4) has a light inlet and two light outlets, one of which is in communication with the main light outlet and has the same diameter as the main light outlet, and the other light outlet is connected to an external spectrometer via a first optical fiber (11) arranged along the first optical fiber channel (3); the light inlet and the halogen lamp light source (6) are connected via a collimator (5) and a second optical fiber (12); One end face of the cylindrical surface attachment (14) is provided with a groove body that is sleeved with the front end of the main shell (1), and the other end has a cylindrical surface with a typical curvature radius consistent with the outer surface of the power transformer insulation paper; the cylindrical surface attachment (14) is provided with an optical channel in the axial direction that is connected with the main light outlet and has the same diameter.

2. The portable collection device for near-infrared diffuse reflectance spectrum of insulating paper according to claim 1, characterized in that: A first positioning mark (10) is arranged above the external front end of the main shell (1), and a second positioning mark (141) is arranged at the external upper end of the cylindrical attachment (14); the first positioning mark (10) and the second positioning mark (141) are of the same size; and the axis of the cylindrical surface is in the direction of the second positioning mark (141).

3. The portable collection device for near-infrared diffuse reflectance spectrum of insulating paper according to claim 1, characterized in that: The cylindrical surface of the cylindrical surface attachment (14) is a flexible shading plate (142); the middle portion of the flexible shading plate (142) is fixedly connected to the other end of the cylindrical surface attachment (14), and is provided with a light outlet that is in communication with the light channel of the cylindrical surface attachment (14) and has the same diameter as that of the cylindrical surface attachment (14); and two telescopic rods are provided between the end surface of the flexible shading plate (142) that is close to the cylindrical surface attachment (14) and the cylindrical surface attachment (14); The telescopic rod comprises a screw (144), a nut (145), a sleeve (148) and two frames (146); the two frames (146) are fixedly arranged on the other end surface of the cylindrical attachment (14); the lower end of the sleeve (148) is rotatably connected to the two frames (146) via a rotating shaft (147); the nut (145) is rotatably connected to the upper end of the sleeve (148); the screw (144) passes through the nut (145) and the sleeve (148) in sequence, is threadedly connected to the nut (145), and is slidably matched with the sleeve (148); one end of the screw (144) is fixedly connected to the flexible sunshade (142) via a fixing ball (143).

4. The portable collection device for near-infrared diffuse reflectance spectrum of insulating paper according to claim 1, characterized in that: The inner wall and the inner wall of the light outlet and the light inlet of the integrating sphere (4), the inner wall of the main light outlet at the front end of the main housing (1), and the inner wall of the light channel of the cylindrical accessory (14) are all coated with white polytetrafluoroethylene or barium sulfate coating.

5. The portable collection device for near-infrared diffuse reflectance spectrum of insulating paper according to claim 1, characterized in that: The first optical fiber (11) and the second optical fiber (12) are both near-infrared quartz optical fibers.

6. The portable collection device for near-infrared diffuse reflectance spectrum of insulating paper according to claim 1, characterized in that: The axis of the light inlet of the inner wall of the integrating sphere (4) coincides with the axis of the light outlet of the main housing or forms an angle of 8°.

7. The portable collection device for near-infrared diffuse reflectance spectrum of insulating paper according to claim 1, characterized in that: A heat dissipation fan (7) is provided at the rear end of the interior of the main housing (1); and a plurality of heat dissipation holes are provided at the top of the rear end of the exterior of the main housing (1).

8. The portable collection device for near-infrared diffuse reflectance spectrum of insulating paper according to claim 1, characterized in that: A switch (8) is provided at the lower end of the cooling fan (7); a circuit board (9) is fixed inside the handle (2), and the circuit board (9) is electrically connected to the halogen light source (6), the cooling fan (7) and the switch (8); the circuit board (9) is electrically connected to a power line (13); an opening is provided at the lower end of the handle (2), and the power line (13) and the first optical fiber (11) pass through the opening.

9. The portable collection device for near-infrared diffuse reflectance spectrum of insulating paper according to claim 1, characterized in that: The groove of the cylindrical surface attachment (14) is provided with an internal thread; the front end of the main housing (1) is provided with an external thread; the cylindrical surface attachment (14) is matched with the front end thread of the main housing (1).

10. The portable collection device for near-infrared diffuse reflectance spectrum of insulating paper according to claim 1, characterized in that: It also comprises a protective cover (15); the inner side of the protective cover (15) is provided with an internal thread which matches with the front end thread of the main housing (1).

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