Plastic light transmittance detector

Abstract

The utility model 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 homogenizing plate, light rays emitted by the light source module enter the light guide plate through optical fibers and are guided by the light guide plate to be emitted to the reflecting plate, the reflecting plate reflects the light rays to the light guide plate, and the light rays penetrate through the light guide plate and the light homogenizing 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] This application relates to the field of light transmittance testing, and more particularly to a plastic light transmittance tester. Background Technology

[0002] Laser welding of automotive plastic materials is widely used in various automotive parts, and the light transmittance of plastic materials is an important indicator of welding process quality. By detecting the light transmittance of plastics, the quality of laser welding can be guaranteed.

[0003] Conventional transmittance meters can only test some transparent or translucent materials, and the testing error is large for irregular plastic samples. Most transmittance meters can only measure a single point, resulting in low accuracy. Furthermore, the lasers used for welding plastics are mostly near-infrared lasers, which can easily lead to errors when using transmittance meters with the same light source wavelength. Utility Model Content

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

[0005] The purpose of this application is to at least partially solve one of the technical problems existing in the related art. The embodiments of this application provide a plastic transmittance detector that can realize simultaneous detection of transmittance at multiple points and improve detection efficiency.

[0006] An embodiment of this application provides a plastic transmittance meter, comprising:

[0007] Base;

[0008] A light source module, wherein the light source module is disposed within the base;

[0009] A 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 homogenizing plate. The light emitted by the light source module enters the light guide plate through an optical fiber. The light is guided by the light guide plate to the reflector. The reflector reflects the light back to the light guide plate. The light passes through the light guide plate and the light homogenizing plate.

[0010] A sample stage, which is mounted on the base, is used to place plastic samples.

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

[0012] According to an embodiment of this application, the light source module includes a light source with a wavelength range of 800nm ​​to 1000nm.

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

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

[0015] According to an embodiment of this 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 this application, the optical fiber is a multi-fiber splitter, the light inlet of the optical fiber is connected to the light outlet of the integrating sphere, and the multiple light outlets of the optical fiber are connected to the light guide plate.

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

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

[0019] According to an embodiment of this application, the detection module includes a focusing lens, a filter, a beam splitter, an infrared detector, and a data processor.

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

[0021] The above scheme has at least the following beneficial effects: A plastic sample is placed on the sample stage. Light emitted from the light source module enters the light guide plate via an optical fiber. The light is guided by the light guide plate to the reflector plate, which reflects the light back to the light guide plate. The light passes through the light guide plate, then through the light homogenizer plate, and finally onto the sample stage. The light passes through the plastic sample on the sample stage. The detection module collects the light signal transmitted through the plastic sample and obtains the transmittance based on the transmitted light signal. This scheme enables simultaneous multi-point transmittance detection, is suitable for transmitting transmittance testing of irregular plastic samples, and improves detection efficiency and accuracy. Attached Figure Description

[0022] The accompanying drawings are used to provide a further understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0023] Figure 1 This is a structural diagram of a plastic transmittance meter;

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

[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 Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0028] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, or the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0029] The embodiments of this application will be further described below with reference to the accompanying drawings.

[0030] An embodiment of this application provides a plastic transmittance tester.

[0031] Reference Figure 1 and Figure 2 A plastic transmittance tester 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 The light source module 200 is disposed within 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 reflector 310, a light guide plate 320, and a light homogenizing plate 330. The light emitted by the light source module 200 enters the light guide plate 320 through the optical fiber 210. The light is guided by the light guide plate 320 to the reflector 310. The reflector 310 reflects the light to the light guide plate 320. The light passes through the light guide plate 320 and the light homogenizing plate 330; the sample stage 400 is disposed on the base 100 and is used to place a plastic sample; the detection module 500 is used to obtain the transmittance based on the light signal transmitted through the plastic sample.

[0033] In this embodiment, a plastic sample is placed on the sample stage 400. Light emitted from the light source module 200 enters the light guide plate 320 via the optical fiber 210. The light is guided by the light guide plate 320 to the reflector plate 310, which reflects the light back to the light guide plate 320. The light then passes through the light guide plate 320 and then through the uniform light plate 330 before illuminating the sample stage 400. 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. This method enables simultaneous multi-point transmittance detection and is suitable for transmitting transmittance testing of irregular plastic samples, improving detection efficiency and accuracy.

[0034] The base 100 is cube-shaped. The base 100 has a cavity, within which the light source module 200 is located. A display 110 and buttons can be mounted on the side of the base 100. The display 110 shows relevant data, and the buttons allow for the input of relevant parameters and commands.

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

[0036] Of course, in other embodiments, other types of light sources may be used; in other embodiments, the wavelength range of the light source may also be different. This can be set according to actual production needs.

[0037] The light source module 200 includes an integrating sphere, with the light source positioned at the light inlet of the integrating sphere. The inner wall of the integrating sphere is coated with a diffuse reflection layer. Light emitted from the light source enters the integrating sphere through the light inlet, is reflected by the diffuse reflection layer on the inner wall, and then exits from the light outlet. The high reflectivity of the internal coating uniformly diffuses the light, thus providing uniform and stable light.

[0038] Reference Figure 2 Optical fiber 210 is a multi-fiber splitter, with multiple optical fibers 210 connected after a single optical fiber 210; each optical fiber 210 has the same core diameter. The light inlet of optical fiber 210 is connected to the light outlet of the integrating sphere, and the multiple light outlets of optical fiber 210 are connected to the light guide plate 320. Light rays emitted from the light outlet of the integrating sphere enter optical fiber 210 through the light inlet, propagate along the single optical fiber 210, and then propagate along the branched multiple optical fibers 210.

[0039] Reference Figure 4 The light diffusion module 300 includes a reflector 310, a light guide plate 320, and a light homogenizing plate 330. The reflector 310 is disposed on one side of the light guide plate 320, and the light homogenizing plate 330 is disposed on the other side of the light guide plate 320.

[0040] The light guide plate 320 is a honeycomb light guide plate 320, which mainly utilizes the honeycomb structure to guide and control light. When light enters the honeycomb light guide plate 320, it undergoes multiple reflections and refractions on various surfaces of the honeycomb structure, thereby changing the direction of light propagation and enabling the light to be evenly distributed 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 internal structure exhibits a honeycomb geometry, typically composed of numerous small hexagonal honeycombs. This structure not only increases the optical path in the thickness direction of the light guide plate 320 but also significantly increases the number of reflections and refractions of light within the light guide plate 320, contributing to improved light utilization and uniformity of light emission. In addition to the honeycomb macrostructure, the surface of the light guide plate 320 may also contain various optical microstructures, such as tiny prisms, lenses, gratings, or dots. These microstructures can further modulate the light, improving the light distribution and emission angle to meet different optical design requirements.

[0041] Multiple fiber optic interfaces 321 are provided on each of the four sides of the light guide plate 320, and each fiber optic interface 321 is connected to a fiber optic cable 210. Light rays exiting from the light outlet of the fiber optic cable 210 enter the light guide plate 320 from multiple angles through the multiple fiber optic interfaces 321 on the sides of the light guide plate 320. Multiple reflections and refractions occur on the various surfaces of the honeycomb structure, thereby changing the direction of light propagation and allowing the light to be evenly distributed on the light-emitting surface of the light guide plate 320 before illuminating the reflector plate 310. The reflector plate 310 reflects the light. The light guide plate 320 also has a light-transmitting hole that penetrates the entire light guide plate 320. The reflected light passes through the light-transmitting hole, through the light guide plate 320, then through the light-diffusing plate 330, and finally illuminates the sample stage 400.

[0042] The reflector 310 is made of PTFE material, and the light-diffusing plate 330 is made of acrylic material.

[0043] The sample stage 400 is mounted on the base 100 and located at the top of the cavity. The sample stage 400 is made of high-transmittance glass.

[0044] The sample stage 400 is equipped with clamps. These clamps hold and secure the plastic samples placed on the sample stage 400. Multiple clamps are provided, each holding one plastic sample, allowing for simultaneous testing of multiple plastic samples.

[0045] The sample stage 400 is equipped with a background acquisition point and a reference acquisition point. The background acquisition point is an opaque point, and the reference acquisition point is a blank point. One opaque location on the sample stage 400 serves as the background acquisition point, and the energy acquired from this location is denoted as T0. Another blank point without a sample serves as the reference acquisition point, and the energy acquired from this blank point is denoted as T1. The energy transmitted through the sample after it is placed in the stage is denoted as T. A Then the transmittance of the sample is T = T A / (T1-T0)*100%. This enables visualization of test points, and allows for customization of the location, size, and number of test points, facilitating test monitoring.

[0046] A light shield 600 is movably connected to the base 100. When the ambient light has a significant impact, the light shield 600 can be lowered during testing.

[0047] The detection module 500 includes a focusing lens, a filter, a beam splitter, an infrared detector, and a data processor. The detection module 500 is located above the instrument, horizontally facing downwards towards the sample. The focusing lens focuses the infrared radiation passing through the plastic sample. The focused light passes through the filter, which removes excess light, leaving infrared light with wavelengths greater than 780 nm that passes through the beam splitter. The beam splitter decomposes the collected near-infrared light according to wavelength, converting polychromatic light into monochromatic light that illuminates the infrared detector. The infrared detector is made of indium gallium arsenide (InGaAs). 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 transmittance data for each wavelength, which is then output and displayed on the display 110. This provides a display of the sample's transmittance, facilitating testing and monitoring.

[0048] The above is a detailed description of the preferred embodiments of this application, but this application is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A plastic transmittance tester, characterized in that, include: Base; A light source module, wherein the light source module is disposed within the base; A 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 homogenizing plate. The light emitted by the light source module enters the light guide plate through an optical fiber. The light is guided by the light guide plate to the reflector. The reflector reflects the light back to the light guide plate. The light passes through the light guide plate and the light homogenizing plate. A sample stage, which is mounted on the base, is used to place plastic samples. A detection module is used to obtain the transmittance based on the light signal transmitted through the plastic sample.

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

3. The plastic light transmission detector according to claim 2, characterized in that, The light source includes at least one of halogen lamps, LEDs, and xenon lamps.

4. The plastic light transmittance detector according to claim 2, wherein The light source module includes an integrating sphere, and the light source is disposed at the light inlet of the integrating sphere.

5. The plastic light transmittance detector according to claim 4, wherein 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 light transmission detector according to claim 4, wherein The optical fiber is a multi-fiber splitter, with the optical fiber's inlet connected to the integrating sphere's outlet, and the multiple outlets of the optical fiber connected to the light guide plate.

7. The plastic light transmission detector according to claim 1, wherein The sample stage is equipped with clamps for holding the plastic sample.

8. The plastic light transmission detector according to claim 1, wherein The sample stage is equipped with a background acquisition point and a reference acquisition point. The background acquisition point is an opaque point, and the reference acquisition point is a blank point.

9. The plastic light transmission detector according to claim 1, wherein The detection module includes a focusing lens, a filter, a beam splitter, an infrared detector, and a data processor.

10. The plastic light transmission detector according to claim 1, wherein A light shield is movably connected to the base.

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