Plastic light transmittance detector

Abstract

The invention provides a plastic light transmittance detector. The plastic light transmittance detector comprises a base, a light source module, a light diffusion module, a sample table and a detection module, the light diffusion module is located between the light source module and the sample table and comprises a reflecting plate, a light guide plate and a light uniformizing plate, a plurality of optical fiber interfaces are evenly distributed in the side face of the light guide plate, light inlets of optical fibers are connected with light outlets of the light source module, and the light outlets of the optical fibers are connected with the optical fiber interfaces in a one-to-one correspondence mode. Light emitted by the light source module enters the light guide plate through the optical fiber and is guided by the light guide plate to be emitted to the reflecting plate, the reflecting plate reflects the light to the light guide plate, and the light penetrates through the light guide plate and the light uniformizing plate. The detection module obtains the light transmittance according to the light signal penetrating through the plastic sample; the device can realize simultaneous detection of multi-point light transmittance, is suitable for light transmittance test of irregular plastic samples, and improves the detection efficiency and accuracy.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of light transmittance detection, and in particular to a plastic light transmittance detector. Background Art

[0002] Laser welding of automotive plastic materials has been widely used in various automotive parts. The light transmittance of plastic materials is an important indicator of the quality of the welding process. The quality of laser welding can be guaranteed by testing the light transmittance of plastics.

[0003] Conventional light transmittance testers can only detect some transparent or translucent materials, resulting in significant errors when testing irregular plastic samples. Most light transmittance testers can only measure a single point, resulting in low accuracy. Furthermore, the laser used to weld plastics is typically near-infrared, which can easily lead to errors when using a light transmittance meter with the same wavelength. Summary of the Invention

[0004] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0005] The purpose of this application is to solve one of the technical problems existing in the related art to at least a certain extent. The embodiment of this application provides a plastic transmittance detector that can realize simultaneous detection of multi-point transmittance and improve detection efficiency.

[0006] An embodiment of the present application provides a plastic light transmittance detector, comprising:

[0007] base;

[0008] a light source module, the light source module being disposed in the base;

[0009] A light diffusion module, the light diffusion module is located between the light source module and the sample stage, the light diffusion module includes a reflector, a light guide plate and a light homogenizer, the side of the light guide plate is evenly distributed with multiple optical fiber interfaces, the light inlet of the optical fiber is connected to the light outlet of the light source module, and the multiple light outlets of the optical fiber are connected to the optical fiber interfaces one by one. The light emitted by the light source module enters the light guide plate through the optical fiber, and the light is guided by the light guide plate to be emitted toward the reflector, and the reflector reflects the light toward the light guide plate, and the light passes through the light guide plate and the light homogenizer;

[0010] A sample stage, the sample stage is arranged on the base, and the sample stage is used to place a plastic sample;

[0011] A detection module is used to obtain light transmittance based on a light signal passing through the plastic sample.

[0012] According to an embodiment of the present application, the light source module includes a light source, and the wavelength range of the light source is 800 nm to 1000 nm.

[0013] According to an embodiment of the present application, the light source includes at least one of a halogen lamp light source, an LED light source, and a xenon lamp light source.

[0014] According to an embodiment of the present application, the light source module includes an integrating sphere, and the light source is arranged at a light inlet of the integrating sphere.

[0015] According to an embodiment of the present application, the inner wall of the integrating sphere is coated with a diffuse reflection layer, and the light emitted by the light source is reflected by the diffuse reflection layer and then emitted from the light outlet of the integrating sphere.

[0016] According to an embodiment of the present application, a plurality of honeycomb light guide structures are provided inside the light guide plate.

[0017] According to an embodiment of the present application, the sample stage is provided with a clamp for clamping the plastic sample.

[0018] According to an embodiment of the present application, the sample stage is provided with a background collection point and a reference collection point, the background collection point is an opaque point, and the reference collection point is a blank point.

[0019] According to an embodiment of the present application, the detection module includes a focusing mirror, a filter, a spectroscopic element, an infrared detector and a data processor.

[0020] According to an embodiment of the present application, a light shield is movably connected to the base.

[0021] The above solution has at least the following beneficial effects: a plastic sample is placed on a sample stage, and light from the light source module enters the light guide plate via an optical fiber. The light is guided by the light guide plate toward the reflector plate, which reflects the light back toward the light guide plate. The light then passes through the light guide plate and then the light diffuser plate, irradiating the sample stage. The light then passes through the plastic sample on the sample stage; the detection module collects the light signal transmitted through the plastic sample and, based on the light signal, determines the transmittance. This system enables simultaneous multi-point transmittance detection, making it suitable for transmittance testing of irregular plastic samples and improving detection efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0023] Figure 1 This is the structural diagram of the plastic transmittance tester;

[0024] Figure 2 This is the internal structure diagram of the plastic transmittance tester;

[0025] Figure 3 This is a structural diagram of the light diffusion module;

[0026] Figure 4 This is a schematic diagram of light propagation in the light diffusion module. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0028] It should be noted that although the device schematics illustrate functional module divisions and the flowcharts illustrate logical sequences, in certain circumstances, the steps shown or described may be performed in a sequence that differs from the module divisions in the device or the sequence in the flowcharts. The terms "first," "second," and the like in the specification, claims, or accompanying drawings are used to distinguish similar items and are not necessarily used to describe a specific sequence or precedence.

[0029] The embodiments of the present application are further described below with reference to the accompanying drawings.

[0030] An embodiment of the present application provides a plastic light transmittance detector.

[0031] Reference Figure 1 and Figure 2 , a plastic transmittance detector includes: a base 100, a light source module 200, a light diffusion module 300, a sample stage 400 and a detection module 500.

[0032] Reference Figure 3 and Figure 4 , wherein the light source module 200 is arranged in the base 100; the light diffusion module 300 is located between the light source module 200 and the sample stage 400, the light diffusion module 300 includes a reflective plate 310, a light guide plate 320 and a light homogenizing plate 330, and a plurality of optical fiber interfaces 321 are evenly distributed on the side of the light guide plate 320, the light inlet of the optical fiber 210 is connected to the light outlet of the light source module 200, and the multiple light outlets of the optical fiber 210 are connected to the optical fiber interfaces 321 in a one-to-one correspondence. The light emitted by the light source module 200 enters the light guide plate 320 through the optical fiber 210, and the light is guided by the light guide plate 320 to be emitted toward the reflective plate 310. The reflective plate 310 reflects the light toward the light guide plate 320, and the light passes through the light guide plate 320 and the light homogenizing plate 330; the sample stage 400 is arranged on the base 100, and the sample stage 400 is used to place the plastic sample; the detection module 500 is used to obtain the transmittance according to the light signal passing through the plastic sample.

[0033] In this embodiment, a plastic sample is placed on a sample stage 400. Light emitted by the light source module 200 propagates through the optical fiber 210 and enters the light guide plate 320 through multiple optical fiber interfaces 321 evenly distributed on the side of the light guide plate 320, making the light entering the light guide plate 320 more uniform. The light is guided by the light guide plate 320 toward the reflector 310, which reflects the light back toward the light guide plate 320. The light then passes through the light guide plate 320 and then through the light homogenizer 330, irradiating the sample stage 400, further making the light irradiating the plastic sample more uniform. The light passes through the plastic sample on the sample stage 400; the detection module 500 collects the light signal transmitted through the plastic sample and obtains the transmittance based on the light signal transmitted through the plastic sample. By irradiating the plastic sample with uniform light, it is possible to simultaneously detect the transmittance of multiple points, which is suitable for transmittance testing of irregular plastic samples, improving detection efficiency and accuracy.

[0034] The base 100 is shaped like a cube. The base 100 has a cavity, and the light source module 200 is located within the cavity. A display 110 and buttons can be provided on the side of the base 100. The display 110 displays relevant data, such as the light transmittance of various plastic samples. The buttons are used to input relevant parameters and commands, such as parameters for setting the light intensity. The buttons can be electronic components or virtual buttons on a touch screen.

[0035] The light source module 200 includes a light source. In this embodiment, the wavelength of the light source is in the range of 800 nm to 1000 nm. The light source includes at least one of a halogen lamp light source, an LED light source, and a xenon lamp light source.

[0036] The operator can input the light intensity parameters through the buttons as needed and adjust the light intensity of the light source according to the light intensity parameters; the operator can input the wavelength parameters through the buttons as needed and adjust the wavelength of the light source according to the wavelength parameters. The wavelength of the light source can be adjusted by adjusting the discharge current of the lamp source.

[0037] Of course, in other embodiments, the light source may be other types of light sources; in other embodiments, the wavelength range of the light source may be other, which can be set according to actual production requirements.

[0038] Light source module 200 includes an integrating sphere, with a light source positioned at the light inlet. The inner wall of the sphere is coated with a diffuse reflective layer. Light from the light source enters the integrating sphere through the light inlet, is reflected by the diffuse reflective layer on the inner wall, and then exits through the light outlet. The highly reflective properties of the inner coating evenly diffuse the light, providing uniform and stable light.

[0039] Reference Figure 2Fiber 210 is a split-to-multiple fiber 210, with multiple fibers 210 connected to one fiber 210. Each fiber 210 has the same core diameter. The light inlet of fiber 210 is connected to the light outlet of the integrating sphere, and the multiple light outlets of fiber 210 are connected to the light guide plate 320. Light emitted from the light outlet of the integrating sphere enters fiber 210 through the light inlet, propagates along a single fiber 210, and then propagates along the multiple bifurcated fibers 210.

[0040] Reference Figure 3 The light diffusion module 300 includes a reflective plate 310 , a light guide plate 320 , and a light diffuser 330 . The reflective plate 310 is disposed on one side of the light guide plate 320 , and the light diffuser 330 is disposed on the other side of the light guide plate 320 .

[0041] Reference Figure 4 , the light guide plate 320 is in the shape of a rectangular parallelepiped. The side surfaces of the light guide plate 320 are the remaining four surfaces except for the side facing the reflector 310 and the side facing the light homogenizing plate 330. A plurality of optical fiber interfaces 321 are evenly arranged on the side surfaces of the light guide plate 320. In this embodiment, the plurality of optical fiber interfaces 321 are distributed in rows along the length direction of the side surfaces of the light guide plate 320. Of course, in other embodiments, the plurality of optical fiber interfaces 321 are distributed in multiple rows according to the width of the side surfaces of the light guide plate 320, the number of optical fiber interfaces 321 and actual production requirements. When the plurality of optical fiber interfaces 321 are distributed in multiple rows, the positions of the optical fiber interfaces 321 in each row correspond one to one; or, the positions of the optical fiber interfaces 321 in each row are staggered one by one.

[0042] The light guide plate 320 is a honeycomb light guide plate 320, which primarily utilizes a honeycomb structure to guide and control light. When light enters the honeycomb light guide plate 320, it undergoes multiple reflections and refractions on the various surfaces of the honeycomb structure, thereby changing the light's propagation direction and evenly distributing the light on the light-emitting surface of the light guide plate 320. This ultimately achieves the effect of converting a line or point light source into a uniform surface light source. Its interior exhibits a honeycomb-like geometric shape, typically composed of numerous small hexagonal cells. This structure not only increases the optical path through the thickness of the light guide plate 320 but also greatly increases the number of reflections and refractions of light within the light guide plate 320, helping to improve light utilization and uniformity. In addition to the honeycomb macrostructure, the surface of the light guide plate 320 may also include various optical microstructures, such as tiny prisms, lenses, gratings, or dots. These microstructures can further control light, improving its distribution and emission angle to meet different optical design requirements.

[0043] The four sides of the light guide plate 320 are each provided with a plurality of fiber optic interfaces 321, and the fiber optic interfaces 321 are respectively connected to the optical fibers 210 in a one-to-one correspondence. The light leaving the light outlet of the optical fiber 210 enters the light guide plate 320 from multiple angles through the multiple fiber optic interfaces 321 on the side of the light guide plate 320, undergoes multiple reflections and refractions on the various surfaces of the honeycomb structure, and then changes the propagation direction of the light, so that the light can be evenly distributed on the light exit surface of the light guide plate 320, and then irradiated on the reflective plate 310. The reflective plate 310 reflects the light, and the light guide plate 320 is also provided with a light-transmitting hole that penetrates the entire light guide plate 320. The reflected light passes through the light guide plate 320 from the light-transmitting hole, and then passes through the light-distributing plate 330, and then irradiates the sample stage 400.

[0044] The reflector 310 is made of PTFE material, which has good light reflection performance. The light diffuser 330 is made of acrylic material, which has good light diffuser performance.

[0045] The sample stage 400 is disposed on the base 100 and is located at the top of the cavity. The sample stage 400 is made of glass with high light transmittance.

[0046] The sample stage 400 is provided with a clamp. The clamp is used to clamp and fix the plastic sample placed on the sample stage 400. There are multiple clamps, each clamp clamping one plastic sample, and multiple plastic samples can be placed for simultaneous testing.

[0047] The sample stage 400 is provided with a background collection point and a reference collection point. The background collection point is an opaque point and the reference collection point is a blank point. There is an opaque position point on the sample stage 400 as the background collection point. The energy of the background point is recorded as T0. There is a blank point without a sample as the reference collection point. The energy of the blank point is recorded as T1. The energy of the sample after the sample is placed is recorded as T A , then the sample transmittance is T = T A / (T1-T0)*100%. The test points can be visualized and the location, size and quantity of the test points can be customized to facilitate test monitoring.

[0048] A light shield 600 is movably connected to the base 100. When the ambient light has a greater impact, the light shield 600 can be lowered during testing.

[0049] The detection module 500 includes a focusing mirror, a filter, a spectroscopic element, an infrared detector and a data processor. The detection module 500 is located above the instrument, and the detection module 500 is horizontally facing downwards and facing the sample. The focusing mirror focuses the infrared radiation light passing through the plastic sample, and the focused light passes through the filter. The filter filters out the excess light source, and the remaining infrared light with a wavelength greater than 780nm penetrates the spectroscopic element. The spectroscopic element decomposes the collected near-infrared according to the wavelength, and converts the complex light into monochromatic light to irradiate the infrared detector. The infrared detector is made of indium gallium arsenide InGaAs material. The infrared detector converts the collected infrared light signal into an electrical signal and outputs it to the data processor. The data processor converts the electrical signal into an image and the transmittance data of each wavelength and outputs and displays it on the display 110. The sample transmittance screen display is realized, which is convenient for test monitoring.

[0050] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present application, and these equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A plastic transmittance detector, characterized in that: include: base; a light source module, the light source module being disposed in the base; A light diffusion module, the light diffusion module is located between the light source module and the sample stage, the light diffusion module includes a reflector, a light guide plate and a light homogenizer, the side of the light guide plate is evenly distributed with multiple optical fiber interfaces, the light inlet of the optical fiber is connected to the light outlet of the light source module, and the multiple light outlets of the optical fiber are connected to the optical fiber interfaces one by one. The light emitted by the light source module enters the light guide plate through the optical fiber, and the light is guided by the light guide plate to be emitted toward the reflector, and the reflector reflects the light toward the light guide plate, and the light passes through the light guide plate and the light homogenizer; A sample stage, the sample stage is arranged on the base, and the sample stage is used to place a plastic sample; A detection module is used to obtain light transmittance based on a light signal passing through the plastic sample.

2. The plastic transmittance detector according to claim 1, characterized in that: The light source module includes a light source, and the wavelength range of the light source is 800nm to 1000nm.

3. The plastic transmittance detector according to claim 2, characterized in that: The light source includes at least one of a halogen lamp light source, an LED light source and a xenon lamp light source.

4. The plastic light transmittance detector according to claim 2, characterized in that: The light source module includes an integrating sphere, and the light source is arranged at a light inlet of the integrating sphere.

5. The plastic transmittance detector according to claim 4, characterized in that: The inner wall of the integrating sphere is coated with a diffuse reflection layer, and the light emitted by the light source is reflected by the diffuse reflection layer and then emitted from the light outlet of the integrating sphere.

6. The plastic transmittance detector according to claim 1, characterized in that: A plurality of honeycomb light guide structures are provided inside the light guide plate.

7. The plastic transmittance detector according to claim 1, characterized in that: The sample stage is provided with a clamp for clamping the plastic sample.

8. The plastic light transmittance detector according to claim 1, characterized in that: The sample stage is provided with a background collection point and a reference collection point, the background collection point is an opaque point, and the reference collection point is a blank point.

9. The plastic light transmittance detector according to claim 1, characterized in that: The detection module includes a focusing mirror, a filter, a spectroscopic element, an infrared detector and a data processor.

10. The plastic light transmittance detector according to claim 1, characterized in that: A light shield is movably connected to the base.

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