Device and method for testing aging degree of nitride fluorescent powder

Abstract

The invention relates to a device and method for testing the aging degree of nitride fluorescent powder, and belongs to the technical field of preventing optical device components from being contaminated, the device for testing the aging degree of nitride fluorescent powder comprises a spherical shell, a light inlet and a light outlet, and the light inlet and the light outlet are formed in the spherical shell; the turning plate is connected with the light outlet; a plurality of grids are uniformly distributed on the turning plate; and the photoelectric element is arranged in the grid and is used for detecting the change of luminous flux. The cleaning box is fixedly arranged at the top of the spherical shell; the supporting pipe is fixedly arranged at the top of the cleaning box; the supporting rod is arranged in the supporting pipe in a sliding mode in the vertical direction. The lead screw is fixedly connected to the bottom end of the supporting rod. The connecting pipe is rotationally arranged at the bottom end of the lead screw; the nozzle is fixedly connected to the bottom end of the connecting pipe; the transmission wheel is rotationally arranged at the bottom end of the supporting pipe and is in threaded fit with the lead screw. The method has the effect of automatically positioning the pollution position in the integrating sphere.

Description

Technical Field

[0001] The present application relates to the technical field of preventing contamination of optical device components, and in particular to a device and method for testing the aging degree of nitride phosphors. Background Art

[0002] During long-term use, nitride phosphors will age due to factors such as light, heat, and humidity, resulting in a decrease in their luminous efficiency. Integrating spheres are usually used to evaluate the aging degree of phosphors. By placing the phosphor sample to be tested in an integrating sphere, using a light source to excite the phosphor to emit light, and then using a spectrometer to measure its luminous spectrum and luminous flux, the aging degree of the phosphor can be accurately quantified.

[0003] The integrating sphere is usually made of metal or high-reflectivity material. Its inner surface is coated with a high-reflectivity diffuse reflection coating to ensure that the light is evenly distributed in the sphere. The integrating sphere is provided with one or more inlet ports for introducing the excitation light source; one or more outlet ports for connecting the spectrometer or light detector; and a sample placement area for fixing the phosphor sample to be tested. When the light source irradiates the phosphor sample, the fluorescence emitted by the sample is evenly distributed after multiple reflections in the integrating sphere, and is finally detected by the spectrometer through the outlet port, thereby achieving accurate measurement of the optical properties of the phosphor.

[0004] During the testing of nitride phosphors, the reflective coating on the inner surface of the integrating sphere may be contaminated by phosphor particles or environmental dust, resulting in a decrease in its reflective ability. This contamination directly affects the accuracy of the test results, because the reduced reflectivity of the reflective coating will lead to light signal loss, thereby underestimating the actual luminous performance of the phosphor. Currently, the main way to solve this problem is to manually locate the contamination and clean it. However, manual operation is time-consuming and inaccurate, especially when the internal space of the integrating sphere is large or the contamination is unevenly distributed. Summary of the invention

[0005] In order to improve the problem of requiring manual positioning of the contamination position in an integrating sphere, the present application provides a device and method for testing the aging degree of nitride phosphors.

[0006] The present application provides a device and method for testing the aging degree of nitride phosphors using the following technical solutions:

[0007] A device for testing the aging degree of nitride phosphors, comprising:

[0008] A spherical shell, a light inlet and a light outlet, wherein the light inlet and the light outlet are respectively arranged on the spherical shell;

[0009] A flip plate and a grid, wherein the flip plate is connected to the light outlet; a plurality of grids are evenly distributed on the flip plate;

[0010] A photoelectric element is disposed in the grid and is used to detect changes in light flux.

[0011] Optionally, it further includes: a cleaning box and a supporting tube, wherein the cleaning box is fixedly mounted on the top of the spherical shell; the supporting tube is fixedly mounted on the top of the cleaning box;

[0012] A support rod and a lead screw, wherein the support rod is vertically slidably disposed in the support tube; the lead screw is fixedly connected to the bottom end of the support rod;

[0013] A connecting pipe and a nozzle, wherein the connecting pipe is rotatably arranged at the bottom end of the lead screw; and the nozzle is fixedly connected to the bottom end of the connecting pipe;

[0014] A transmission wheel is rotatably disposed at the bottom end of the support tube and is threadably matched with the lead screw.

[0015] Optionally, an air pipe and a liquid pipe are fixedly connected to the outer peripheral surface of the connecting pipe; an air pump is provided on the air pipe, and a liquid pump is provided on the liquid pipe.

[0016] Optionally, a top pipe is fixedly provided on the top of the cleaning box, and a rotating assembly 1 is arranged inside the top pipe; the rotating assembly 1 includes:

[0017] A driving wheel, which is rotatably disposed at the bottom end of the top pipe and meshes with the transmission wheel;

[0018] A magnetic member, a plurality of the magnetic members are slidably arranged in the top pipe; a plurality of metal sheets are fixed in the top pipe; the magnetic member is an electromagnet; after being energized, the magnetic member moves by magnetically adsorbing the metal sheet;

[0019] A transmission shaft, the transmission shaft is slidably disposed in the jacking tube along the axial direction of the jacking tube, and the transmission shaft moves by magnetic adsorption with the magnetic member;

[0020] A rotating shaft is fixedly connected to the transmission shaft, and the rotating shaft cooperates with the driving wheel to make the driving wheel rotate.

[0021] Optionally, the outer circumferential surface of the rotating shaft is evenly distributed with a plurality of spiral protrusions along the circumferential direction; the driving wheel is provided with a transmission hole for passing the rotating shaft; the inner circumferential surface of the transmission hole is evenly distributed with a plurality of spiral grooves along the circumferential direction, and the spiral protrusions engage with the spiral grooves.

[0022] Optionally, a sliding hole is opened at the bottom end of the screw, and a rotating component 2 is arranged in the sliding hole; the rotating component 2 has the same structure as the rotating component 1, and the rotating component 2 is used to drive the connecting pipe to rotate.

[0023] Optionally, a magnetic sheet is fixed in the grid, and the magnetic sheet is an electromagnet; concave holes are evenly distributed on the flip plate, and a metal rod is slidably provided in the concave holes. The magnetic sheet is used to magnetically adsorb the metal rod, and a contact switch is provided between the metal rod and the concave holes. The magnetic part is electrically connected to the contact switch, and the photoelectric element is electrically connected to the magnetic sheet.

[0024] Optionally, the photoelectric element is connected to the magnetic sheet via an amplifier, a comparator and a relay.

[0025] Optionally, the air pump and the liquid pump are respectively connected to a timer.

[0026] The present application provides a method for testing the aging degree of nitride phosphors using the following technical solution: using a device for testing the aging degree of nitride phosphors to remove pollutants in the spherical shell.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. The self-cleaning device can automatically clean the inner wall of the spherical shell. When a certain reflective area is contaminated and the light reflection intensity is weakened, the photodiode detects that the light flux is lower than the preset value, triggering the contact switch to close, and then starting the magnetic part to control the rotation and descent of the nozzle, so that it can accurately align with the contaminated area for cleaning. This automated cleaning mechanism improves cleaning efficiency and reduces manual intervention, ensuring the continuous cleaning of the test environment and the accuracy of the test results.

[0029] 2. The self-cleaning device can not only automatically clean the inner wall of the ball shell, but also intelligently control cleaning and drying. The start and stop time of the liquid pump and the air pump are controlled by a timer to ensure that the cleaning liquid and the drying gas can be sprayed in sequence, thereby improving the cleaning efficiency.

[0030] 3. The device divides the reflective coating inside the spherical shell into multiple reflective areas, which correspond to the grids one by one, thus achieving precise positioning of the contaminated area. When the light reflection intensity of a certain reflective area decreases, the corresponding grid will trigger the contact switch to close, thereby controlling the nozzle to rotate and descend to the corresponding position for cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the integrating sphere according to the embodiment of the present application.

[0032] Figure 2 It is a cross-sectional view of the flap of the embodiment of the present application.

[0033] Figure 3 It is a schematic diagram of the structure of the spherical shell of the embodiment of the present application.

[0034] Figure 4It is a cross-sectional view of the top pipe according to an embodiment of the present application.

[0035] Figure numerals: 1. spherical shell; 2. light outlet; 3. flap; 4. grid; 5. magnetic sheet; 6. recessed hole; 7. metal rod; 8. cleaning box; 9. nozzle; 10. connecting pipe; 11. supporting pipe; 12. transmission shaft; 13. lead screw; 14. transmission wheel; 15. top pipe; 16. driving wheel; 17. magnetic part; 18. slide groove; 19. reset spring 1; 20. metal sheet; 21. rotating shaft; 22. slide hole; 23. photoelectric element; 24. tension spring. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-4 This application is described in further detail.

[0037] The embodiment of the present application discloses a device and method for testing the degree of aging of nitride phosphors. The device for testing the degree of aging of nitride phosphors includes a spherical shell 1 and a self-cleaning device arranged at the top of the spherical shell 1. The inner circumference of the spherical shell 1 is coated with a reflective coating; the reflective coating can be polytetrafluoroethylene. The outer circumference of the spherical shell 1 is fixedly provided with a light inlet and a light outlet 2 connected to the spherical shell 1; preferably, the light inlet and the light outlet 2 are respectively arranged on both sides of the spherical shell 1, and the lines connecting the light inlet and the light outlet 2 and the center of the spherical shell 1 are not colinear. A light source is arranged in the light inlet to project into the spherical shell 1. A detection device is arranged on the light outlet 2.

[0038] The detection device includes a flap 3 and a plurality of grids 4 fixed on the plane of the flap 3. Preferably, the flap 3 is hinged to the end face of the light outlet 2, so that the flap 3 can rotate around the end face of the light outlet 2; when in the detection state, the flap 3 flips downward so that the flap 3 covers the light outlet 2, and the grid 4 faces the direction of the light outlet 2; when in the non-detection state, the flap 3 flips upward, and the flap 3 is located above the light outlet 2. A photoelectric element 23 is fixed in each grid 4. In this embodiment, the photoelectric element 23 is a photodiode; a magnetic sheet 5 is embedded in the side wall of the grid 4 close to the flap 3, and the magnetic sheet 5 is an electromagnet. The photoelectric element 23 is connected to the magnetic sheet 5 through an amplifier, a comparator and a relay. Specifically, the photodiode is connected to the reverse input end of the amplifier; the output end of the amplifier is connected to the reverse input end of the comparator, and the positive input end of the amplifier is connected to the reference voltage; the output end of the comparator is connected to the relay coil, and the electromagnet is connected to the normally open contact of the relay; the non-reverse input end of the amplifier is grounded.

[0039] Furthermore, after the light source emits light into the spherical shell 1, when the luminous flux received by the photodiode in the grid 4 is less than the preset luminous flux, the input voltage received by the comparator is less than the reference voltage, the comparator sends a high-level signal to the relay, and the relay controls the magnetic sheet 5 to be energized.

[0040] A plurality of recessed holes 6 are provided on the flap 3, and each grid 4 corresponds to a recessed hole 6. A metal rod 7 is slidably arranged in the recessed hole 6 along the thickness direction of the flap 3; when the magnetic sheet 5 is powered on, the metal rod 7 is magnetically attracted to move it toward the photoelectric element 23. A tension spring 24 is fixed in the recessed hole 6, and the end of the tension spring 24 is fixed to the metal tube, which is used to drive the metal rod 7 to reset away from the magnetic sheet 5. A contact switch is arranged between the recessed hole 6 and the metal rod 7; when the metal rod 7 moves toward the magnetic sheet 5, the contact switch is in a closed state; when the magnetic sheet 5 is powered off and the metal rod 7 moves away from the magnetic sheet 5, the contact switch is in an open state.

[0041] The self-cleaning device includes a cleaning box 8 fixedly mounted on the top surface of the ball shell 1 and a nozzle 9 arranged to slide vertically. A connecting pipe 10 is fixedly connected to the top of the nozzle 9, and an air pipe and a liquid pipe respectively connected to the connecting pipe 10 are fixedly connected to the outer peripheral surface of the connecting pipe 10; an air pump is arranged on the air pipe, and the liquid pipe is connected to the liquid storage box through the liquid pump; the liquid pipe is used to spray cleaning liquid onto the inner wall of the ball shell 1; and the air pipe is used to spray drying gas onto the inner wall of the ball shell 1 for rapid air drying.

[0042] A support tube 11 is fixedly provided on the top surface of the cleaning box 8, and a support rod is slidably provided inside the support tube 11. The support tube 11 provides a guide for the vertical movement of the support rod; preferably, the support tube 11 and the support rod are both polygonal. A lead screw 13 is fixedly provided at the bottom end of the support rod; a transmission wheel 14 threadedly matched with the lead screw 13 is rotatably provided at the bottom end of the support tube 11, and the lead screw 13 penetrates the transmission wheel 14 and is coaxially connected with the transmission wheel 14. The top end of the connecting tube 10 is rotatably connected to the bottom end of the lead screw 13. A top tube 15 is fixedly provided on the inner wall of the cleaning box 8, and a driving wheel 16 is rotatably provided at the bottom end of the top tube 15, and the driving wheel 16 is meshed with the driving wheel 14; a rotating component 1 is provided inside the top tube 15, and the rotating component 1 drives the driving wheel 16 to rotate to move the lead screw 13 and the nozzle 9 downward. A rotating component 2 is provided inside the lead screw 13, and the rotating component 2 is used to drive the connecting tube 10 to rotate in the horizontal direction, and is used to adjust the horizontal direction of the nozzle 9. The rotating component 2 has the same structure as the rotating component 1.

[0043] The rotating assembly 1 includes a transmission shaft 12 and a rotating shaft 21 fixedly connected to each other, and a plurality of magnetic parts 17 slidably arranged in the top pipe 15 in the horizontal direction. The inner wall of the top pipe 15 is evenly provided with a plurality of slide grooves 18 along its axial direction, and the plurality of magnetic parts 17 are respectively slidably arranged in the slide grooves 18. A return spring 19 is fixedly arranged in the slide groove 18, which is used to drive the magnetic part 17 to move inwardly to the slide groove 18. A plurality of metal sheets 20 are evenly arranged on the inner wall of the top pipe 15 opposite to the slide groove 18 along the axial direction of the top pipe 15. After the magnetic part 17 is energized, it moves to the outside of the slide groove 18 by magnetic attraction with the metal sheet 20. A metal block is fixedly arranged at the top of the transmission shaft 12. After the magnetic part 17 is energized and moves to the outside of the slide groove 18, it moves upward by magnetic attraction of the transmission shaft 12. A guide piece is fixedly provided on the side wall of the transmission shaft 12, and a guide groove for accommodating the guide piece is opened on the inner wall of the top pipe 15; a second return spring is fixedly provided in the guide groove, and the second return spring is fixedly connected to the guide piece for driving the guide piece to return downward.

[0044] The rotating shaft 21 is fixed to the bottom end of the transmission shaft 12; the outer circumference of the rotating shaft 21 is uniformly provided with a plurality of spiral protrusions along its circumference; the driving wheel 16 is provided with a transmission hole for passing the rotating shaft 21; the inner circumference of the transmission hole is uniformly provided with a plurality of spiral grooves along its circumference, and the spiral protrusions engage with the spiral grooves. When the rotating shaft 21 moves vertically, the driving wheel 16 rotates by the spiral protrusions pressing against the spiral grooves.

[0045] Specifically, the magnetic member 17 in the top pipe 15 is connected to the contact switches in the several recessed holes 6, and the power supply is connected through the contact switches. In this embodiment, the magnetic member 17 in the top pipe 15 is connected to the contact switches in the several recessed holes 6 arranged along the width direction of the flap 3. When the contact switch in the recessed hole 6 is turned on, the magnetic member 17 is energized and magnetically attracts the transmission shaft 12 to move upward. During the movement of the rotating shaft 21, the driving wheel 16 is driven to rotate, and the lead screw 13 and the nozzle 9 are driven downward through the transmission wheel 14. The reflective coating in the spherical shell 1 is divided into several reflective areas, and each grid 4 corresponds to a reflective area; the several reflective areas arranged vertically in the spherical shell 1 correspond one by one to the several grids 4 arranged along the length direction of the flap 3. The height of the magnetic member 17 in the top pipe 15 corresponds to the distance the nozzle 9 moves downward, so that the nozzle 9 moves downward to the same height as the corresponding reflective area.

[0046] The top of the inner circumference of the connecting tube 10 is evenly distributed with a number of spiral grooves along its circumference. The rotating shaft 21 in the rotating assembly 2 is meshed with the connecting tube 10, and the connecting tube 10 is driven to rotate by the vertical movement of the rotating shaft 21. The bottom of the lead screw 13 is provided with a sliding hole 22 for accommodating the transmission shaft 12 of the rotating assembly 2; a number of magnetic parts 17 are evenly distributed in the sliding hole 22 of the lead screw 13 along the axial direction of the lead screw 13. The magnetic part 17 in the lead screw 13 rotates the connecting tube 10 by magnetically adsorbing the transmission shaft 12. Specifically, the magnetic part 17 in the lead screw 13 is connected to the contact switches in the several recessed holes 6 arranged along the length direction of the flap 3; after the contact switches in the recessed holes 6 are turned on, the magnetic part 17 is energized and adsorbs the transmission shaft 12 of the rotating assembly to move upward, and during the movement of the transmission shaft 12 and the rotating shaft 21, the connecting tube 10 is driven to rotate. The several reflection areas arranged along the circumference in the spherical shell 1 correspond one by one to the several grids 4 arranged along the width direction of the flap 3. The height of the magnetic member 17 in the lead screw 13 corresponds to the rotation angle of the connecting tube 10, so that the nozzle 9 rotates to the same angle as the corresponding reflection area. It should be noted that the magnetic member 17 of the rotating assembly 1 and the rotating assembly 2 are respectively connected to the contact switch.

[0047] Specifically, when a certain reflective area in the spherical shell 1 is contaminated, the intensity of the reflected light is weakened, and the light signal received by the corresponding grid 4 is reduced; when the light flux received by the photodiode is less than the preset light flux, the contact switch at the position of the grid 4 is closed. After the contact switch is closed, the corresponding magnetic member 17 in the lead screw 13 and the top tube 15 is energized; after the magnetic member 17 in the lead screw 13 is energized, the nozzle 9 is controlled to rotate to a corresponding angle; after the magnetic member 17 in the top tube 15 is energized, the nozzle 9 is controlled to descend to a corresponding height; the nozzle 9 is descended to the corresponding height of the contaminated reflective area and then faces the reflective area for subsequent cleaning operations.

[0048] The connection circuit of the liquid pump is provided with a timer 1 and a relay; the connection circuit of the air pump is provided with a timer 2 and a relay. After the timer 1 records the unit time 1, it sends a high-level signal to the relay, and the liquid pump is connected to the normally open contact of the relay, and then sends a low-level signal to the relay after the unit time. After the timer 2 records the unit time 3, it sends a high-level signal to the relay, and the air pump is connected to the normally open contact of the relay, and then sends a low-level signal to the relay after the unit time 4. Preferably, the unit time 3 is not less than the unit time 2, and after the liquid pump is turned off after the unit time 2, the air pump is turned on after the unit time 3. Timer 1 and timer 2 are respectively connected in parallel with a number of contact switches, and after any one of the contact switches is turned on, timer 1 and timer 2 start timing.

[0049] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A device for testing the aging degree of nitride phosphors, characterized in that: include: A spherical shell (1), a light inlet and a light outlet (2), wherein the light inlet and the light outlet (2) are respectively arranged on the spherical shell (1); A flip plate (3) and a grid (4), wherein the flip plate (3) is connected to the light outlet (2); a plurality of grids (4) are evenly distributed on the flip plate (3); A photoelectric element (23), wherein the photoelectric element (23) is arranged in the grid (4), and the photoelectric element (23) is used to detect changes in light flux.

2. The device for testing the aging degree of nitride phosphor according to claim 1, characterized in that: Also includes: A cleaning box (8) and a support tube (11), wherein the cleaning box (8) is fixedly mounted on the top of the spherical shell (1); and the support tube (11) is fixedly mounted on the top of the cleaning box (8); A support rod and a lead screw (13), wherein the support rod is vertically slidably disposed in the support tube (11); the lead screw (13) is fixedly connected to the bottom end of the support rod; A connecting pipe (10) and a nozzle (9), wherein the connecting pipe (10) is rotatably arranged at the bottom end of the lead screw (13); and the nozzle (9) is fixedly connected to the bottom end of the connecting pipe (10); A transmission wheel (14), the transmission wheel (14) is rotatably disposed at the bottom end of the support tube (11) and is threadably matched with the lead screw (13).

3. The device for testing the aging degree of nitride phosphor according to claim 2, characterized in that: An air pipe and a liquid pipe are fixedly connected to the outer peripheral surface of the connecting pipe (10); an air pump is arranged on the air pipe, and a liquid pump is arranged on the liquid pipe.

4. The device for testing the aging degree of nitride phosphor according to claim 2, characterized in that: A top pipe (15) is fixedly provided on the top of the cleaning box (8), and a rotating assembly 1 is arranged inside the top pipe (15); the rotating assembly 1 comprises: A driving wheel (16), the driving wheel (16) is rotatably disposed at the bottom end of the top pipe (15) and meshes with the transmission wheel (14); A magnetic member (17), wherein a plurality of the magnetic members (17) are slidably disposed in the top tube (15); a plurality of metal sheets (20) are also fixedly disposed in the top tube (15); the magnetic member (17) is an electromagnet; when the magnetic member (17) is energized, it moves by magnetically adsorbing the metal sheets (20); A transmission shaft (12), the transmission shaft (12) being slidably disposed in the top tube (15) along the axial direction of the top tube (15), and the transmission shaft (12) being moved by magnetic attraction with the magnetic member (17); A rotating shaft (21), wherein the rotating shaft (21) is fixedly connected to the transmission shaft (12), and the rotating shaft (21) cooperates with the driving wheel (16) to enable the driving wheel (16) to rotate.

5. The device for testing the aging degree of nitride phosphor according to claim 4, characterized in that: The outer circumferential surface of the rotating shaft (21) is uniformly provided with a plurality of spiral protrusions along the circumferential direction; the driving wheel (16) is provided with a transmission hole for passing the rotating shaft (21); the inner circumferential surface of the transmission hole is uniformly provided with a plurality of spiral grooves along the circumferential direction, and the spiral protrusions are engaged with the spiral grooves.

6. The device for testing the aging degree of nitride phosphor according to claim 4, characterized in that: A sliding hole (22) is provided at the bottom end of the lead screw (13), and a second rotating assembly is arranged in the sliding hole (22); the second rotating assembly has the same structure as the first rotating assembly, and the second rotating assembly is used to drive the connecting pipe (10) to rotate.

7. The device for testing the aging degree of nitride phosphor according to claim 6, characterized in that: A magnetic sheet (5) is fixedly arranged in the grid (4), and the magnetic sheet (5) is an electromagnet; concave holes (6) are evenly distributed on the flap (3), and a metal rod (7) is slidably arranged in the concave hole (6); the magnetic sheet (5) is used to magnetically adsorb the metal rod (7), and a contact switch is arranged between the metal rod (7) and the concave hole (6); the magnetic member (17) is electrically connected to the contact switch, and the photoelectric element (23) is electrically connected to the magnetic sheet (5).

8. The device for testing the aging degree of nitride phosphor according to claim 7, characterized in that: The photoelectric element (23) is connected to the magnetic sheet (5) via an amplifier, a comparator and a relay.

9. The device for testing the aging degree of nitride phosphor according to claim 3, characterized in that: The air pump and the liquid pump are connected to a timer respectively.

10. A method for testing the aging degree of nitride phosphor, characterized in that: The pollutants in the spherical shell (1) are removed by using the nitride phosphor aging degree testing device as claimed in any one of claims 1 to 9.

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