Device for testing illumination uniformity of fluorescent glass

Abstract

The invention discloses a device for testing illumination uniformity of fluorescent glass, and relates to the technical field of fluorescent glass illumination. The device comprises a carrying platform module, a laser light source module, an optical collection module and a spectral analysis module, the carrying platform module is used for carrying and fixing a fluorescent glass sample to be detected and driving the fluorescent glass sample to rotate; the laser light source module is used for generating and outputting an excitation light beam to act on the fluorescent glass sample, and a light emitting path is adjustable; the optical collection module is used for collecting an optical signal emitted by the fluorescent glass sample; and the spectral analysis module is connected with the optical path of the optical output port of the optical collection module and is used for receiving and analyzing the optical signal. The device is simple in structure, controllable in cost, convenient to operate, capable of achieving high-spatial-resolution automatic scanning, high in measurement precision and good in repeatability.

Description

Technical Field

[0001] This invention relates to the field of fluorescent glass lighting technology, and more specifically to an apparatus for testing the uniformity of fluorescent glass lighting. Background Technology

[0002] Fluorescent glass, as a high-performance optical conversion material, can absorb blue light and emit fluorescence with a longer wavelength, and is widely used in high-end displays, solid-state lighting, and laser projection. Especially in the field of high-power LED lighting, fluorescent glass is becoming a key material to replace traditional phosphor coating solutions due to its superior performance. Compared with the process of coating phosphors mixed in resin, fluorescent glass has higher thermal stability, anti-aging properties, and material consistency, effectively solving problems such as color drift and luminous efficacy decay caused by resin yellowing and phosphor sedimentation in traditional LEDs. It is particularly suitable for high-end commercial lighting, automotive headlights, and special lighting scenarios with extremely high requirements for light quality and reliability.

[0003] The uniformity of illumination on the emitting surface of fluorescent glass is a core factor determining the light output quality of the final optical system. In the industrialization of fluorescent glass, it is typically made into a 2-inch ingot, which is then cut into thin sheets. If there are problems such as uneven distribution of phosphor or differences in thermal stress distribution within these 2-inch fluorescent glass sheets, it will directly lead to uneven spatial distribution of luminous intensity or color, ultimately resulting in poor product consistency and significant difficulties in industrialization. Furthermore, for LED lighting, this non-uniformity will directly cause obvious color spots, color differences, or yellow ring phenomena on the emitting surface of the lamp, seriously affecting the quality of the light spot and visual comfort. Therefore, in the production and quality control of fluorescent glass, there is an urgent need for a precise and rapid testing method to quantify its illumination uniformity.

[0004] Currently, the most common uniformity testing methods in the industry are as follows: (1) Imaging spectroradiometer method. This method uses a CCD or CMOS camera to photograph the entire luminescent surface of the fluorescent glass. Although this method can obtain full-field distribution information at once, its system cost is high, and the measurement accuracy is easily affected by factors such as lens distortion and uneven camera pixel response. More importantly, this method measures surface brightness, which is difficult to accurately reflect the intrinsic luminescence characteristics of the material under the excitation of a specific small-sized laser spot, and there is a difference from the excitation mode of the small-sized luminescent point of the LED chip; (2) Multi-point mechanical scanning method. This method usually uses a multi-dimensional motion platform to measure the sample point by point. Although the measurement accuracy is high, the system structure is complex, the footprint is large, and the scanning efficiency is low. The complex mechanical motion not only introduces higher positioning errors and vibration interference, but also increases the cost of the entire system and reduces its stability, making it difficult to meet the needs of rapid and stable detection on industrial production lines; (3) Single-point measurement method. Some simple devices use a fixed laser spot and a fixed sample for single-point measurement, and then manually move the sample to change its position. This method is extremely inefficient, and manual operation introduces a large amount of random error, which cannot guarantee the accuracy of the measurement point and the consistency of the data, and it cannot achieve automated full radial up-scan system scanning.

[0005] In summary, existing technologies cannot simultaneously achieve high precision and high efficiency, resulting in complex systems and high costs. With the increasing application of fluorescent glass in high-end LED lighting and other fields, developing a fluorescent glass illumination uniformity testing device that is simple in structure, cost-effective, easy to operate, and capable of high spatial resolution automated scanning has become an urgent technological need for improving product quality and driving industry development. Summary of the Invention

[0006] To address the aforementioned problems, this invention discloses a device for testing the uniformity of fluorescent glass illumination. It has a simple structure, controllable cost, convenient operation, and can achieve automated scanning with high spatial resolution, high measurement accuracy, and good repeatability.

[0007] An apparatus for testing the illumination uniformity of fluorescent glass according to the present invention includes a stage module, a laser source module, an optical collection module, and a spectral analysis module. The stage module is used to carry and fix the fluorescent glass sample to be tested and drive the fluorescent glass sample to rotate. The laser source module is used to generate and output an excitation beam that acts on the fluorescent glass sample, and the output optical path is adjustable. The optical collection module is used to collect the light signal emitted through the fluorescent glass sample. The spectral analysis module is connected to the optical output port of the optical collection module and is used to receive and analyze the light signal.

[0008] Preferably, the laser source module includes a blue fiber laser, a first optical fiber, and an optical shaping element. The excitation beam of the blue fiber laser is led out through the first optical fiber and shaped by the optical shaping element to form a circular spot with a diameter of less than or equal to 1 mm on the lower surface of the fluorescent glass sample.

[0009] Preferably, the optical shaping element includes a collimating lens and a focusing lens.

[0010] Preferably, the laser source module further includes an adjustment bracket for fixing the light-emitting end of the first optical fiber and the light-shaping element; the adjustment bracket includes at least two orthogonally arranged linear motion modules to provide two-dimensional precision positioning in the plane and to manually or electrically adjust their spatial position.

[0011] Preferably, the stage module includes a hollow electric rotary stage and a sample clamp fixedly mounted on the electric rotary stage, wherein the fluorescent glass sample is fixed on the electric rotary stage by the sample clamp.

[0012] Preferably, the optical collection module is an integrating sphere, and the size of its sampling port is greater than or equal to the size of the fluorescent glass sample to be tested.

[0013] Preferably, the spectral analysis module is a spectrometer, which is connected to the optical output port of the integrating sphere via a second optical fiber.

[0014] Preferably, the device further includes a control and data processing unit, which is communicatively connected to the stage module, the spectral analysis module, and the laser source module. During the test, the control and data processing unit coordinates the output power of the laser source module, the rotation and positioning of the stage module, and the acquisition timing of the spectral analysis module, and automatically stores and processes the acquired spectral data to calculate uniformity parameters.

[0015] Preferably, the control and data processing unit is also communicatively connected to the electrically adjustable adjustment bracket to automatically adjust the initial irradiation position of the excitation beam before the start of the test or during the test sequence.

[0016] Compared with the prior art, the advantages of the device for testing the uniformity of fluorescent glass illumination disclosed in this invention are: (1) The present invention replaces the complex two-dimensional XY motion with a single rotational motion, which greatly simplifies the mechanical structure and reduces manufacturing costs and maintenance difficulty.

[0017] (2) By setting the rotary table to have extremely high angular positioning accuracy and repeatability, and combining it with a small-sized light spot, the present invention ensures high spatial resolution and data reliability of each measurement point on the scanning path.

[0018] (3) The entire testing process of this invention can be completed automatically and can achieve fully automatic multi-circle scanning, avoiding human operation errors and greatly improving detection efficiency and consistency.

[0019] (4) The excitation optical path and the collection optical path of the present invention are both kept fixed, avoiding optical path deviation or vibration interference that may be caused by movement, thus ensuring the stability of the measurement signal. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a device for testing the uniformity of fluorescent glass illumination disclosed in this invention.

[0022] Figure 2This is a flowchart of the testing method in Example 1.

[0023] In the figure: 1-Blue fiber laser; 2-First fiber; 3-Collimating lens; 4-Focusing lens; 5-Electric rotary stage; 6-Sample clamp; 7-Integrating sphere; 8-Second fiber; 9-Spectrometer; 10-Computer. Detailed Implementation

[0024] The specific embodiments of the present invention will be briefly described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] Figures 1-2 A preferred embodiment of the present invention is shown and analyzed in detail.

[0026] Example 1 like Figure 1 As shown, this embodiment provides a basic and cost-effective testing solution, namely a testing device and method for manually adjusting the excitation position, to demonstrate the core principle of the present invention and the feasibility of manual operation.

[0027] This embodiment discloses an apparatus for testing the uniformity of illumination of fluorescent glass, including a stage module, a laser source module, an optical collection module, a spectral analysis module, and a control and data processing unit.

[0028] The stage module includes a hollow electric rotary stage 5 and a sample holder 6 fixedly mounted on the electric rotary stage 5. The stage module is designed to support and fix the fluorescent glass sample to be tested. The fluorescent glass sample is fixed to the electric rotary stage 5 by the sample holder 6, and the center of the fluorescent glass sample coincides with the rotation axis of the electric rotary stage 5, rotating under the drive of the electric rotary stage 5. The electric rotary stage 5 is electrically connected to the control and data processing unit, enabling precise rotation and positioning at a predetermined angle.

[0029] The laser source module includes a blue fiber-coupled laser 1, a first optical fiber 2, an optical shaping element, and an adjustment bracket. The excitation beam from the blue fiber-coupled laser 1 is led out through the first optical fiber 2 and optically shaped by a collimating lens 3 and a focusing lens 4, forming a circular spot with a diameter of less than or equal to 1 mm on the lower surface of the fluorescent glass sample. The adjustment bracket includes two orthogonally arranged linear motion modules, which are used to fix the light-emitting end of the first optical fiber 2 and the optical shaping element, respectively. By manually adjusting the adjustment bracket, the spatial position of the light-emitting end of the first optical fiber 2 and the optical shaping element can be changed, thereby adjusting the irradiation position of the excitation beam on the surface of the fluorescent glass sample under test.

[0030] The optical collection module is an integrating sphere 7, the size of which is greater than or equal to the size of the fluorescent glass sample to be tested. The sampling port is directly opposite and close to the upper surface of the fluorescent glass sample to collect the light signal emitted through the fluorescent glass sample. This light signal includes the remaining excitation light and the fluorescence generated by the excitation.

[0031] The spectral analysis module is a spectrometer 9, which is connected to the optical output port of the integrating sphere 7 via a second optical fiber 8, and is used to receive and analyze optical signals.

[0032] The control and data processing unit is a computer 10, which is communicatively connected to the stage module, the spectral analysis module, and the laser source module. During the test, it coordinates the output power of the laser source module, the rotation and positioning of the stage module, and the acquisition timing of the spectral analysis module, and automatically stores and processes the acquired spectral data to calculate uniformity parameters.

[0033] This invention sets the initial irradiation position by adjusting the light output path of the laser source module, and changes the irradiation position of the excitation beam on the surface of the fluorescent glass sample by rotating the electric rotary stage 5. Combined with the data collected by the spectrometer 9 at different positions, the invention achieves the test of the illumination uniformity of the fluorescent glass sample.

[0034] like Figure 2 As shown, the testing method in this embodiment includes the following steps: S1. Start the test: Start the entire test device, powering on the blue fiber laser 1, spectrometer 9, electric rotary table 5 and computer 10 in sequence, and perform system self-test.

[0035] S2. Device initialization: Securely mount the two-inch fluorescent glass sample to be tested onto the electric rotary stage 5 using the sample clamp 6. Use tools such as a dial indicator to align the sample, ensuring that the geometric center of the fluorescent glass sample is precisely aligned with the rotation axis of the electric rotary stage 5.

[0036] S3. Adjusting the laser excitation position: This is the core step of this embodiment. By observation (or with the aid of a CCD for positioning), manually adjust the knobs on the adjustment bracket to change the emission angle and position of the excitation beam, precisely adjusting the 1mm diameter circular excitation spot to the predetermined starting measurement position. This starting position is usually selected at the edge of the sample (i.e., at the maximum radius), but it can also be flexibly adjusted to any position, such as near the center or other specific radius points, depending on the testing requirements.

[0037] S4. Calibrate integrating sphere 7 and set zero position: Adjust the spatial position of integrating sphere 7 so that its sampling port is directly facing and close to the upper surface of the fluorescent glass sample. In the computer control software 10, set the current angular position of the electric rotary stage 5 as the zero reference.

[0038] S5. Set test parameters: Input the specific parameters for this test through the computer 10 control software, including: ① Measurement path: for example, starting angle 0°, ending angle 360°; ② Measurement step size: 15°, which means that 24 data points will be collected on a circular path of the sample; ③ Laser parameters: set the power of the excitation light; ④ Spectrometer parameters: set the integration time, averaging times, etc., to ensure that the signal intensity is moderate and unsaturated.

[0039] S6. Move the electric rotary table 5 to the first measurement point: Drive the electric rotary table 5 to move the sample to the starting measurement position.

[0040] S7. Spectrometer 9 collects fluorescence data at the current point: Spectrometer 9 performs one or multiple average measurements at the current location to obtain a complete fluorescence spectrum.

[0041] S8. Data saving and recording: The control computer 10 automatically saves the spectral and intensity data of the current measurement point and stores it in association with the current location information (such as angle).

[0042] S9. Determine whether all predetermined position measurements have been completed: The control software determines whether all positions from the starting point to the ending point have been measured based on the parameters set in S5.

[0043] S10. Control the electric rotary table 5 to rotate and move to the next measurement point: If all measurements are not completed, the control unit calculates the rotation angle required to move to the next point and drives the electric rotary table 5 to move precisely.

[0044] S11. Data Processing and Analysis: After all predetermined locations have been measured, the software automatically processes all collected data. This includes: ① Extracting characteristic values ​​for each point (such as fluorescence peak intensity and dominant wavelength). ② Plotting a "fluorescence intensity - sample rotation angle" curve. ③ Calculating the uniformity of illumination (e.g., maximum, minimum, average, standard deviation, and non-uniformity of fluorescence intensity).

[0045] S12, Output Test Report: Generate a comprehensive report that includes test conditions, raw data, analysis charts, and uniformity conclusions.

[0046] S13. End of test: The operator can turn off the equipment or manually adjust the laser spot to a new radial position to perform the uniformity test of the next circular path on the sample.

[0047] Example 2 Based on Embodiment 1, this embodiment equips the laser source module with an electrically adjustable bracket. This bracket includes two orthogonally arranged linear motion modules, used to fix the light-emitting end of the first optical fiber 2 and the light-shaping element, respectively, thereby precisely changing the irradiation position of the excitation beam on the surface of the fluorescent glass sample. The computer 10 is communicatively connected to the adjustable bracket to automatically adjust the initial irradiation position of the excitation beam before the test begins or during the test sequence.

[0048] The testing method in this embodiment includes the following steps: S1. Start the test: Start the entire test device, powering on the blue fiber laser 1, electric adjustment bracket, spectrometer 9, electric rotary table 5 and computer 10 in sequence, and perform system self-test.

[0049] S2. Device initialization: Securely mount the two-inch fluorescent glass sample to be tested onto the electric rotary stage 5 using the sample clamp 6. Use tools such as a dial indicator to align the sample, ensuring that the geometric center of the fluorescent glass sample is precisely aligned with the rotation axis of the electric rotary stage 5.

[0050] S3. Adjusting the laser excitation position: This is the core step of this embodiment and is automatically adjusted. A sequence of radius values ​​to be measured is set through software, such as R = 25.4mm, 20mm, 10mm, 0mm. Subsequently, the circular excitation spot with a diameter of 1mm is precisely adjusted to the predetermined starting measurement position, i.e., the edge point of R = 25.4mm, by controlling the electric adjustment bracket.

[0051] S4. Calibrate integrating sphere 7 and set zero position: Adjust the spatial position of integrating sphere 7 so that its sampling port is directly facing and close to the upper surface of the fluorescent glass sample. In the computer control software 10, set the current angular position of the electric rotary stage 5 as the zero reference.

[0052] S5. Set test parameters: Input the specific parameters for this test through the computer 10 control software, including: ① Measurement path: for example, starting angle 0°, ending angle 360°; ② Measurement step size: 15°, which means that 24 data points will be collected on a circular path of the sample; ③ Laser parameters: set the power of the excitation light; ④ Spectrometer parameters: set the integration time, averaging times, etc., to ensure that the signal intensity is moderate and unsaturated.

[0053] S6. Move the electric rotary table 5 to the first measurement point: Drive the electric rotary table 5 to move the sample to the starting measurement position.

[0054] S7. Spectrometer 9 collects fluorescence data at the current point: Spectrometer 9 performs one or multiple average measurements at the current location to obtain a complete fluorescence spectrum.

[0055] S8. Data saving and recording: The control computer 10 automatically saves the spectral and intensity data of the current measurement point and stores it in association with the current location information (such as angle).

[0056] S9. Determine whether all predetermined position measurements have been completed: The control software determines whether all positions from the starting point to the ending point have been measured based on the parameters set in S5.

[0057] S10. Control the stage rotation to move to the next measurement point: If not all measurements are completed, the control unit calculates the rotation angle required to move to the next point and drives the electric rotary table 5 to move precisely. After the first path scan is completed, the system does not stop but automatically instructs the electric adjustment bracket to move the light spot to the next starting position (R=20mm) and begin a new round of circular path scanning. This process repeats until all preset path measurements are completed, without any manual intervention.

[0058] S11. Data Processing and Analysis: After all predetermined locations have been measured, the software automatically processes all collected data. In addition to generating a uniformity curve for a single path, it can also utilize data from multiple paths to synthesize a two-dimensional fluorescence intensity distribution cloud map of the sample, providing the most intuitive display of uniformity.

[0059] S12. Output Test Report: Generate a comprehensive report that includes a two-dimensional cloud map and a comparison of uniformity data for each path.

[0060] S13. End of test: The fully automated test process is complete. The device is ready to test the next sample.

[0061] The above description of the disclosed embodiments enables those skilled in the art to make and use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit and scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An apparatus for testing the uniformity of illumination from fluorescent glass, characterized in that, The system includes a stage module, a laser source module, an optical collection module, and a spectral analysis module. The stage module is used to carry and fix the fluorescent glass sample to be tested and drive the fluorescent glass sample to rotate. The laser source module is used to generate and output an excitation beam that acts on the fluorescent glass sample, and the output optical path is adjustable. The optical collection module is used to collect the light signal emitted through the fluorescent glass sample. The spectral analysis module is connected to the optical output port of the optical collection module and is used to receive and analyze the light signal.

2. The apparatus for testing the uniformity of fluorescent glass illumination according to claim 1, characterized in that, The laser source module includes a blue fiber laser (1), a first optical fiber (2), and an optical shaping element. The excitation beam of the blue fiber laser (1) is led out through the first optical fiber (2) and shaped by the optical shaping element to form a circular spot with a diameter of less than or equal to 1 mm on the lower surface of the fluorescent glass sample.

3. The apparatus for testing the uniformity of fluorescent glass illumination according to claim 2, characterized in that, The optical shaping element includes a collimating lens (3) and a focusing lens (4).

4. The apparatus for testing the uniformity of fluorescent glass illumination according to claim 2, characterized in that, The laser source module also includes an adjustment bracket for fixing the light-emitting end of the first optical fiber (2) and the light-shaping element; the adjustment bracket includes at least two orthogonally arranged linear motion modules to provide two-dimensional precision positioning in the plane and to manually or electrically adjust its spatial position.

5. The apparatus for testing the uniformity of fluorescent glass illumination according to claim 1, characterized in that, The stage module includes a hollow electric rotary stage (5) and a sample clamp (6) fixedly installed on the electric rotary stage (5). The fluorescent glass sample is fixed on the electric rotary stage (5) by the sample clamp (6).

6. The apparatus for testing the uniformity of illumination of fluorescent glass according to claim 1, characterized in that, The optical collection module is an integrating sphere (7), and the size of its sampling port is greater than or equal to the size of the fluorescent glass sample to be tested.

7. The apparatus for testing the uniformity of fluorescent glass illumination according to claim 6, characterized in that, The spectral analysis module is a spectrometer (9), which is connected to the optical output port of the integrating sphere (7) via a second optical fiber (8).

8. The apparatus for testing the uniformity of fluorescent glass illumination according to claim 4, characterized in that, The device also includes a control and data processing unit, which is communicatively connected to the stage module, the spectral analysis module, and the laser source module. During the test, it coordinates the output power of the laser source module, the rotation and positioning of the stage module, and the acquisition timing of the spectral analysis module, and automatically stores and processes the acquired spectral data to calculate uniformity parameters.

9. The apparatus for testing the uniformity of fluorescent glass illumination according to claim 8, characterized in that, The control and data processing unit is also communicatively connected to the electrically adjustable adjustment bracket to automatically adjust the initial irradiation position of the excitation beam before the start of the test or during the test sequence.

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