A portable collection device for near-infrared diffuse reflectance spectrum of insulating paper

Abstract

The application provides a kind of portable collection device of insulating paper near-infrared diffuse reflectance spectroscopy, belongs to the technical field of spectrum collection, including main casing, cylindrical surface accessory, built-in cavity handle and first optical fiber channel;One end of handle is communicated with the bottom of the rear end of main casing;Two ends of first optical fiber channel are communicated with the bottom of the front end of main casing and the other end of handle respectively;The front center of main casing is provided with main light outlet;There is integrating sphere and halogen lamp light source in main casing;One light outlet of integrating sphere is communicated with main light outlet, and the other light outlet is connected with external spectrometer through first optical fiber arranged along first optical fiber channel;Light inlet and halogen lamp light source are connected through collimating mirror and second optical fiber;Groove is opened in one end face of cylindrical surface accessory, and the other end is cylindrical face;Cylindrical surface accessory is provided with light channel communicated with main light outlet along axis direction.The light outlet of the collection device can be switched to cylindrical face, and perfect fit with the outer surface of insulating paper on site is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of near-infrared spectrum acquisition device, in particular to a kind of portable acquisition device of insulating paper near-infrared diffuse reflectance spectrum. BACKGROUND

[0002] The main insulation of power transformer 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 timely oil change, while the insulating paper is difficult to replace, and its aging state determines the insulation life of the transformer. Near-infrared spectrum analysis technology is a non-destructive, rapid and efficient detection technology, which can be used as an alternative to traditional quantitative evaluation method of insulating paper aging state. To apply near-infrared spectrum analysis technology to quantitative evaluation of insulating paper aging state, first, the near-infrared spectrum and the degree of polymerization of insulating paper with different aging time need to be obtained, and then a correlation model between the near-infrared spectrum and the degree of polymerization of insulating paper is established by using chemometrics method. Therefore, it can be considered that the quality of spectral data directly affects the accuracy of near-infrared spectrum analysis.

[0003] The collection method of near-infrared spectrum is mainly divided into transmission and reflection. When collecting the near-infrared spectrum of the sample, due to the different states and shapes of the sample, different collection accessories need to be used to adapt to different types of samples. Due to the low transparency of insulating paper, the spectrum collection method of insulating paper is mainly diffuse reflection. Among various diffuse reflection collection accessories, the operation of using an integrating sphere to collect spectrum is convenient, only the surface of the light outlet of the integrating sphere needs to be closely attached to the surface of the measured sample, and the spectrum collected by the integrating sphere has the advantages of high signal-to-noise ratio and good repeatability, so it is widely used in the collection of insulating paper spectrum.

[0004] However, in the field application, the insulating paper of the transformer is closely attached to the winding structure, so that the outer surface of the insulating paper is a cylindrical surface. When collecting the spectrum of the insulating paper, due to the fact that the surface of the light outlet of the existing integrating sphere is a plane, it cannot be perfectly attached to 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 further affects the accuracy of quantitative evaluation of the aging state of the insulating paper. SUMMARY

[0005] To solve the above technical problems, the present application provides a kind of portable acquisition device of insulating paper near-infrared diffuse reflectance spectrum, the light outlet of the acquisition device can be switched to a cylindrical surface, which realizes perfect attachment with the outer surface of the insulating paper in the field.

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

[0007] The utility model provides a kind of portable collection device of insulating paper near infrared diffuse reflection spectrum, including main casing, cylindrical surface accessory, built-in cavity handle and first optical fiber channel;One end of the handle is communicated with the bottom of the rear end of the main casing;Two ends of the first optical fiber channel are communicated with the bottom of the front end of the main casing and the other end of handle respectively;The front center of the main casing is provided with main light outlet;

[0008] The integral sphere has one light inlet and two light outlets, one of which is communicated with the main light outlet and has the same diameter, and the other is connected with the external spectrometer through the first optical fiber arranged in the first optical fiber channel;The light inlet and halogen lamp light source are connected through collimating mirror and second optical fiber;

[0009] One end face of the cylindrical surface accessory is provided with a groove body matched with the front end of the main casing, and the other end has a cylindrical surface consistent with the typical curvature radius of the outer surface of the power transformer insulating paper;The cylindrical surface accessory is provided with a light channel communicated with the main light outlet and having the same diameter along the axial direction.

[0010] Preferably, a first positioning mark is provided above the front end of the main casing, a second positioning mark is provided on the upper end of the cylindrical surface accessory, and the first and second positioning marks have 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 accessory is a flexible light shield, the middle part of the flexible light shield is fixedly connected to the other end of the cylindrical surface accessory and is provided with a light outlet communicated with the light channel of the cylindrical surface accessory and having the same diameter, and the end face close to the cylindrical surface accessory of the flexible light shield is provided with two telescopic rods between the flexible light shield and the cylindrical surface accessory.

[0012] The telescopic rod includes a screw rod, a nut, a sleeve and two bracket plates, the two bracket plates are fixedly arranged on the end face of the other end of the cylindrical surface accessory, the lower end of the sleeve is rotatably connected to the two bracket plates through a rotating shaft, the nut is rotatably connected to the upper end of the sleeve, the screw rod passes through the nut and the sleeve in sequence and is threadedly connected to the nut and slidingly matched with the sleeve, and one end of the screw rod is fixedly connected to the flexible light shield through a fixed ball.

[0013] Preferably, the inner wall of the integral sphere, the inner walls of the light outlet and the light inlet, the inner wall of the main light outlet of the front end of the main casing and the inner wall of the light channel of the cylindrical surface accessory are 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 8° angle with the axis of the main light outlet of the main shell.

[0016] Preferably, the inner rear end of the main shell is provided with a heat dissipation fan; a plurality of heat dissipation holes are formed in the top of the rear end of the outer part of the main shell.

[0017] Preferably, the lower end of the heat dissipation fan is provided with a switch; an electric circuit board is fixed in the inner part of the handle, and the electric circuit board is electrically connected with the halogen lamp light source, the heat dissipation fan and the switch; the electric circuit board is electrically connected with a power line; the lower end of the handle is provided with an opening, and the power line and the first optical fiber pass out through the opening.

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

[0020] The present application has the following beneficial effects:

[0021] The present application provides a portable collection device for near-infrared diffuse reflectance spectroscopy 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 realized by the equipped 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 a power transformer. The present application solves the problem that in field application, the outer surface of the insulating paper is a cylindrical surface, the light outlet surface of the existing integrating sphere is a plane, and the light outlet surface of the integrating sphere cannot perfectly match the outer surface of the insulating paper, resulting in serious light leakage at the light outlet of the integrating sphere and seriously affecting the quality of the collected spectrum. The present application improves the quality of the spectral data. BRIEF DESCRIPTION OF DRAWINGS

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

[0023] Figure 2 is a sectional view of the present application along the median symmetrical plane;

[0024] Figure 3 is a sectional view of the cylindrical surface accessory of embodiment 1 of the present application along the symmetrical plane;

[0025] Figure 4 is a sectional view of the protective cover of embodiment 1 of the present application along the symmetrical plane;

[0026] Figure 5 is a schematic diagram of the cylindrical surface accessory of embodiment 2 of the present application;

[0027] Figure 6is another perspective view of the cylindrical surface accessory of embodiment 2 of the present application;

[0028] Figure 7 is a partial A structure diagram of the cylindrical surface accessory of embodiment 2 of the present application.

[0029] In the figure, 1 is a main housing, 2 is a handle, 3 is a first optical fiber channel, 4 is an integrating sphere, 5 is a collimating mirror, 6 is a halogen lamp light source, 7 is a heat dissipation fan, 8 is a switch, 9 is a circuit board, 10 is a first positioning mark, 11 is a first optical fiber, 12 is a second optical fiber, 13 is a power cord, 14 is a cylindrical surface accessory, 141 is a second positioning mark, 142 is a flexible light shield, 143 is a fixed ball, 144 is a screw rod, 145 is a nut, 146 is a shelf plate, 147 is a rotating shaft, 148 is a sleeve, and 15 is a protective cover. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0032] The terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features; in the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0033] Example 1

[0034] This embodiment proposes a portable acquisition device for near-infrared diffuse reflectance spectroscopy of insulating paper, as shown in Figure 1 and Figure 2 , as shown in Figure 1 is a schematic diagram of the overall structure of this embodiment, Figure 2This is a cross-sectional view taken along the central plane of symmetry in this embodiment, including a main housing 1, a cylindrical attachment 14, a handle 2 with an internal 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; both ends of the first optical fiber channel 3 are connected to the bottom of the front end of the main housing 1 and the other end of the handle 2, respectively; 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 arranged sequentially along the length direction inside the main housing 1; the integrating sphere 4 has one 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 through 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 through a collimating lens 5 and a second optical fiber 12. The acquisition principle is as follows: Near-infrared light emitted by the halogen lamp light source 6 passes sequentially through the second optical fiber 12 and the collimating lens 5 into the integrating sphere 4. Then, it shines onto the surface of the insulating paper through the light outlet of the acquisition device. The diffusely reflected near-infrared light is homogenized by multiple reflections through the inner wall of the integrating sphere 4 before passing through the first optical fiber 11 into the near-infrared spectrometer, thus completing the acquisition of the near-infrared diffuse reflectance spectrum of the insulating paper. The collimating lens 5 shapes the beam, transforming the divergent light source into a parallel light source so that the beam diameter matches the diameter of the light outlet of the integrating sphere 4.

[0035] like Figure 3 As shown, Figure 3 This is a cross-sectional view of the cylindrical attachment 14 taken along a plane of symmetry. One end of the cylindrical attachment 14 has a groove that fits into the front end of the main housing 1, and the other end has a cylindrical surface with a radius of curvature consistent with the typical outer surface of the insulating paper of a power transformer. The cylindrical attachment 14 has a light channel of the same diameter that communicates with the main light outlet along its axial direction. Preferably, for stable installation, the groove of the cylindrical attachment 14 has an internal thread; the front end of the main housing 1 has an external thread; and the cylindrical attachment 14 is threaded into the front end of the main housing 1. The cylindrical attachment 14 can be removed when using the acquisition device in a laboratory setting. Additionally, a protective cover 15 is included to protect the entire acquisition device. This cover shields the light outlet when the acquisition device is not in use, preventing dust, moisture, and other contaminants from entering the integrating sphere 4 and affecting the repeatability and consistency of the acquired spectrum. The protective cover 15 is placed on when the acquisition device is not in use and removed when in use. Figure 4 As shown, Figure 4 To protect the sectional view of the cover along the plane of symmetry, the inner side of the cover 15 is provided with an internal thread that mates with the front thread of the main housing 1.

[0036] To determine the relative position between the cylindrical attachment 14 and the main housing 1, and to facilitate the positioning of the cylindrical attachment 14 on the main housing 1, as follows: Figure 3As shown, the first positioning mark 10 is arranged on the outer front end of the main shell 1, and the second positioning mark 141 is arranged on the outer upper end of the cylindrical surface accessory 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 centers of the first positioning mark 10 and the second positioning mark 141 are aligned, the collection of the near-infrared diffuse reflectance spectrum of the insulation paper in the field can be performed.

[0037] In the embodiment, the diameter of the integrating sphere 4 is 50 mm, the diameter of the light outlet on the inner wall of the integrating sphere 4, which communicates with the front end of the first optical fiber channel 3, is 4 mm, and the axis of the light inlet on the inner wall of the integrating sphere 4 forms an 8° angle with the axis of the main light outlet of the main shell 1. The diameters of the light outlet of the cylindrical surface accessory 14, the main light outlet of the front end of the main shell 1, the light outlet on the inner wall of the integrating sphere 4, which communicates with the front end of the main shell 1, and the light inlet on the inner wall of the integrating sphere 4 are all 10 mm.

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

[0039] The interfaces of the first optical fiber and the second optical fiber both use SMA905 interfaces, the interface of the power cord uses a 5521 interface, and 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 lamp light source is selected to be 5 W.

[0040] The materials of the main shell 1, the handle 2, the first optical fiber channel 3, the integrating sphere 4, the protective cover 15, and the cylindrical surface accessory 14 are all aluminum alloys, which help the collection device dissipate heat.

[0041] The main shell, the handle, and the first optical fiber channel are connected by bolts, and the main shell, the integrating sphere, the halogen lamp light source, and the heat dissipation fan are connected by screws. The lower end of the heat dissipation fan 7 is provided with a switch 8. The inside of the handle 2 is fixed with a circuit board 9, which is electrically connected with the halogen lamp light source 6, the heat dissipation fan 7, and the switch 8. The circuit board 9 is electrically connected with the power cord 13. The lower end of the handle 2 is provided with an opening, and the power cord 13 and the first optical fiber 11 pass out through the opening. The end of the power cord 13 is connected with a direct current power supply to supply power to the collection device. The switch 8 is used to control the opening and closing of the halogen lamp light source 6 and the heat dissipation fan 7. The circuit board 9 plays a role of power distribution, control and management, and protection of the circuit in the circuit system, ensuring the normal operation of the halogen lamp light source 6 and the heat dissipation fan 7 and the overall stability of the circuit system.

[0042] For the collection of near infrared diffuse reflectance spectrum of field power transformer insulation paper:

[0043] S1: connect the first optical fiber with the near infrared spectrometer, and connect the power line with the direct current power supply.

[0044] S2: remove the protective cover 15, install the cylindrical surface accessory 14 matched with the curvature radius of the outer surface of the detected power transformer insulation paper, and align the second positioning mark 141 on the cylindrical surface accessory 14 with the first positioning mark 10 on the main shell 1.

[0045] S3: open the switch 8, and complete the corresponding calibration, dark noise removal and other operations according to the requirements of the actual near infrared spectrometer.

[0046] S4: attach the surface of the cylindrical surface accessory 14 to the outer surface of the power transformer insulation paper, and then complete the spectrum saving, processing and other operations in the actual near infrared spectrometer, so as to complete the collection of near infrared diffuse reflectance spectrum of field power transformer insulation paper.

[0047] For the collection of near infrared diffuse reflectance spectrum of laboratory power transformer insulation paper sample:

[0048] S1: connect the first optical fiber 11 with the near infrared spectrometer, and connect the power line 13 with the direct current power supply.

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

[0050] S3: attach the surface of the main shell 1 to the surface of the power transformer insulation paper sample, and then complete the spectrum saving, processing and other operations in the actual near infrared spectrometer, so as to complete the collection of near infrared diffuse reflectance spectrum of laboratory power transformer insulation paper sample.

[0051] Example 2:

[0052] As Figures 5-7 shown, Figure 5 and Figure 6 are two cylindrical surface accessories 14 with different viewing angles, Figure 7The local A structure diagram is shown. The cylindrical surface of the cylindrical surface accessory 14 is a flexible baffle 142. The middle part of the flexible baffle 142 is fixedly connected to the other end of the cylindrical surface accessory 14, and an exit light port is provided in the flexible baffle 142, which is in communication with the light channel of the cylindrical surface accessory 14 and has the same diameter. The end surface of the flexible baffle 142 close to the cylindrical surface accessory 14 is provided with two telescopic rods between the flexible baffle 142 and the cylindrical surface accessory 14. The telescopic rod includes a screw rod 144, a nut 145, a sleeve 148, and two bracket plates 146. The two bracket plates 146 are fixedly arranged on the other end surface of the cylindrical surface accessory 14. The lower end of the sleeve 148 is rotatably connected to the two bracket plates 146 through a rotating shaft 147. The nut 145 is rotatably connected to the upper end of the sleeve 148. The screw rod 144 passes through the nut 145 and the sleeve 148 in sequence, is threadedly connected to the nut 145, and is slidingly fitted with the sleeve 148. One end of the screw rod 144 is fixedly connected to the flexible baffle 142 through a fixed ball 143.

[0053] In this embodiment, the light exit surface of the collection device can be switched between a plane and a cylindrical surface, and the curvature radius can also be adjusted. When the cylindrical surface accessory 14 is installed, the light exit surface is switched from a plane to a cylindrical surface. The surface curvature radius of the cylindrical surface accessory 14 is consistent with the typical curvature radius of the outer surface of the power transformer insulation paper. The flexible baffle 142 forms a cylindrical surface with different curvature radii to adapt to power transformers of different voltage grades during on-site detection.

[0054] In this embodiment, the light exit surface of the collection device can be switched between a plane and a cylindrical surface, and the curvature radius can also be adjusted. When the cylindrical surface accessory 14 is installed, the light exit surface is switched from a plane to a cylindrical surface. The surface curvature radius of the cylindrical surface accessory 14 is consistent with the typical curvature radius of the outer surface of the power transformer insulation paper. The flexible baffle 142 forms a cylindrical surface with different curvature radii to adapt to power transformers of different voltage grades during on-site detection.

[0055] In this embodiment, the light exit surface of the collection device can be switched between a plane and a cylindrical surface, and the curvature radius can also be adjusted. When the cylindrical surface accessory 14 is installed, the light exit surface is switched from a plane to a cylindrical surface. The surface curvature radius of the cylindrical surface accessory 14 is consistent with the typical curvature radius of the outer surface of the power transformer insulation paper. The flexible baffle 142 forms a cylindrical surface with different curvature radii to adapt to power transformers of different voltage grades during on-site detection.

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

[0057] In addition, the collecting device is designed with a handle 2, so that the problem that the existing integrating spheres 4 are mostly cuboids or cylinders and are inconvenient to hold by hand during on-site detection is solved, and the portability of the collecting device is improved.

[0058] The above is only a preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A portable collection device for near infrared diffuse reflectance spectroscopy of insulating paper, characterized in that, It includes main shell (1), cylindrical surface accessory (14), handle (2) with built-in cavity and first optical fiber channel (3); one end of handle (2) is communicated with the bottom of rear end of main shell (1); two ends of first optical fiber channel (3) are communicated with the bottom of front end of main shell (1) and the other end of handle (2) respectively; the front center of main shell (1) is provided with main light outlet; The integral sphere (4) has one light inlet and two light outlets, one of which is communicated with the main light outlet and has the same diameter, and the other is connected with the external spectrometer through the first optical fiber (11) arranged in the first optical fiber channel (3); the light inlet and halogen lamp light source (6) are connected through collimating mirror (5) and second optical fiber (12); One end surface of cylindrical surface accessory (14) is provided with a groove body matched with the front end of main shell (1), and the other end has a cylindrical surface consistent with the typical curvature radius of the outer surface of the insulation paper of power transformer; the cylindrical surface accessory (14) is provided with a light channel communicated with the main light outlet and having the same diameter along the axial direction.

2. The portable collection device for near infrared diffuse reflectance spectroscopy of insulating paper according to claim 1, characterized in that, The first positioning mark (10) is arranged on the upper front end of the outer main shell (1), and the second positioning mark (141) is arranged on the upper end of the outer cylindrical surface accessory (14), and the first positioning mark (10) and the second positioning mark (141) have the same size; 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 spectroscopy of insulating paper according to claim 1, characterized in that, The cylindrical surface of the cylindrical surface accessory (14) is a flexible light shield (142); the middle part of the flexible light shield (142) is fixedly connected with the other end of the cylindrical surface accessory (14) and is provided with a light outlet communicated with the light channel of the cylindrical surface accessory (14) and having the same diameter, and the end surface close to the cylindrical surface accessory (14) of the flexible light shield (142) is provided with two telescopic rods between the cylindrical surface accessory (14); The telescopic rod includes screw rod (144), nut (145), sleeve (148) and two frame plates (146); the two frame plates (146) are fixedly arranged on the other end surface of the cylindrical surface accessory (14); the lower end of the sleeve (148) is rotatably connected with the two frame plates (146) through the rotating shaft (147); the nut (145) is rotatably connected with the upper end of the sleeve (148), the screw rod (144) passes through the nut (145) and the sleeve (148) in sequence and is threadedly connected with the nut (145) and slidingly connected with the sleeve (148); one end of the screw rod (144) is fixedly connected with the flexible light shield (142) through the fixed ball (143).

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

5. The portable collection device for near infrared diffuse reflectance spectroscopy 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 spectroscopy 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 main light outlet of the main shell or forms an 8° angle.

7. The portable collection device for near infrared diffuse reflectance spectroscopy of insulating paper according to claim 1, characterized in that, The rear end of the interior of the main shell (1) is provided with a heat dissipation fan (7); the top of the rear end of the exterior of the main shell (1) is provided with a plurality of heat dissipation holes.

8. The portable collection device for near infrared diffuse reflectance spectroscopy of insulating paper according to claim 7, characterized in that, The lower end of the heat dissipation fan (7) is provided with a switch (8); the interior of the handle (2) is fixed with a circuit board (9), the circuit board (9) is electrically connected with the halogen light source (6), the heat dissipation fan (7) and the switch (8); the circuit board (9) is electrically connected with a power cord (13); the lower end of the handle (2) is provided with an opening, the power cord (13) and the first optical fiber (11) pass out through the opening.

9. The portable collection device for near infrared diffuse reflectance spectroscopy of insulating paper according to claim 1, characterized in that, The groove of the cylindrical surface accessory (14) is internally provided with an internal thread; the front end of the main shell (1) is provided with an external thread; the cylindrical surface accessory (14) is threadedly connected with the front end of the main shell (1).

10. The portable collection device for near infrared diffuse reflectance spectroscopy of insulating paper according to claim 1, characterized in that, Further comprising a protective cover (15); the inner side of the protective cover (15) is provided with an internal thread threadedly connected with the front end of the main shell (1).

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