Light source system for radiometer calibration

Abstract

The present invention proposes a light source system for calibrating a radiometer, comprising a gathering shell, wherein the gathering shell comprises a multi-band reflection layer and a thermal insulation shell, a cooling channel is formed between the thermal insulation shell and the multi-band reflection layer, the inner wall of the multi-band reflection layer is densely covered with a plurality of reflection plates, the reflection plates are used to reflect the light source and converge it to a light outlet, and a filter is arranged between the uniform light channel and the light outlet; the multi-band reflection layer comprises a horizontal section and a U-shaped section, a high heat dissipation block is arranged at the end of the horizontal section, the high heat dissipation block comprises a hollow block, a temperature sensor is arranged in the hollow block, and the hollow block is connected to the cooling channel. The light source system is provided with an adjustable reflection plate, and after the light source is replaced, the reflection of the light source can be adjusted in a controllable manner, thereby greatly improving the convergence rate of the light source. In addition, by arranging an annular hollow block at the light beam convergence point, the abnormally high temperature position can be greatly reduced, thereby ensuring the stability of the light source.

Description

Technical Field

[0001] The invention relates to the field of instrument calibration, and in particular to a light source system for calibrating a radiometer. Background Art

[0002] A radiometer is a device that measures the flux of electromagnetic radiation. The term "radiometer" is sometimes used specifically to refer to infrared radiation detectors, but it can also refer to detectors that detect electromagnetic radiation of various other wavelengths. The most common radiometer is the Crookes radiometer, an early model that contained a rotor (with light and dark colored blades) in a semi-vacuum that rotated when exposed to light.

[0003] The spectrum, irradiance, spatial uniformity of the irradiation field and background radiation of the light source used for radiometer calibration are important factors that affect the metrological calibration results. In order to make the metrological calibration results accurate and reliable, the calibration light source should have the following characteristics: 1. A spectrum close to the actual use scenario of the radiometer; 2. An irradiance that reaches or exceeds the actual use scenario of the radiometer; 3. Good spatial uniformity; 4. Minimum background radiation interference. This avoids calibration errors caused by the radiometer's own spectral absorption bandwidth, linearity, spatial reset accuracy and background radiation interference.

[0004] In the prior art, for example, the invention patent with patent announcement number: CN 110657886 A discloses a light source system for calibrating a radiometer. Its structure radiates the light source to the same outlet through a barrel-shaped structure, and prevents the temperature from being too high by water cooling. However, in actual operation, the following problems exist: 1. After the light source converges at the light outlet, the temperature at the light outlet is very different from the temperature at other positions, and it is difficult to lower the temperature by uniform water cooling, which affects the use; 2. After the internal light source is adjusted and replaced, the convergence point of the light source changes. Since it cannot be adjusted, it cannot be guaranteed that the light source is well converged at one place. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes a light source system for calibrating a radiometer, comprising a collection shell, a radiation light source is arranged at the end of the collection shell, the collection shell comprises a multi-band reflection layer and a thermal insulation shell, a cooling channel is formed between the thermal insulation shell and the multi-band reflection layer, a light outlet is arranged at the other end of the multi-band reflection layer, and a uniform light channel is connected to the light outlet.

[0006] The inner wall of the multi-band reflection layer is densely covered with a plurality of reflection plates, and the reflection plates are used to reflect the light from the light source and converge it to the light outlet. A filter is arranged between the uniform light channel and the light outlet. The multi-band reflection layer includes a horizontal section and a U-shaped section, and a high heat dissipation block is arranged at the end of the horizontal section. The high heat dissipation block includes a hollow block, and a temperature sensor is arranged in the hollow block, and the hollow block is connected to the cooling channel.

[0007] Preferably, the reflective sheet comprises a silver square sheet body, a raised insertion block is provided on the back of the square sheet body, a socket is provided on the insertion block, a U-shaped seat is provided on the multi-band reflective layer, the insertion block is inserted into the U-shaped seat and connected by a latch, a spring is provided on one side of the square sheet body to connect with the multi-band reflective layer, and a ferromagnetic sheet body is provided on the other side, and an electromagnet is provided on the outside of the aggregation shell corresponding to the ferromagnetic sheet body.

[0008] Preferably, the hollow block is an annular structure and is connected to the thermal insulation shell and the multi-band reflective layer via a flange. A plurality of lead-out blocks are provided outside the hollow block, and at least two groups of inlet and outlet blocks are provided with inlet pipes.

[0009] Preferably, the optical filter is clamped on the inner wall of the hollow block, an annular step is provided inside the hollow block, the optical filter is located on the annular step and is pressed with a magnet ring.

[0010] Preferably, a thermal insulation sleeve is provided outside the light homogenizing channel, the thermal insulation sleeve is connected to the hollow block via a flange, and a water-cooling space is formed between the thermal insulation sleeve and the light homogenizing channel, and the water-cooling space is connected to the hollow block.

[0011] Preferably, the cooling channel is connected to a water cooling system, and the water cooling system allows cold water to enter the cooling channel.

[0012] Preferably, the water cooling channel is connected to the thermal insulation shell.

[0013] Preferably, a fiberglass baffle is provided at the end of the light uniforming channel.

[0014] The light source system for radiometer calibration proposed in the present invention has the following beneficial effects: by providing an adjustable reflector, the light source system can controllably adjust the reflection of the light source after replacing the light source, thereby greatly improving the light source convergence rate; in addition, by providing an annular hollow block at the light beam convergence point, the abnormally high temperature position can be greatly reduced, thereby ensuring the stability of the light source; and by internal conduction, the structural compactness of the entire light source is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0016] Figure 1 It is a side structural schematic diagram of the present invention;

[0017] Figure 2 It is a schematic diagram of installing the reflector sheet of the present invention;

[0018] Figure 3 It is a schematic diagram of a high heat dissipation block of the present invention;

[0019] Among them, 1. radiation light source; 2. multi-band reflection layer; 3. thermal insulation shell; 4. cooling channel; 5. light outlet; 6. filter; 7. high heat dissipation block; 8. hollow block; 9. reflection sheet; 10. insertion block; 11. U-shaped seat; 12. latch; 13. spring; 14. electromagnet; 15. ferromagnetic sheet; 16. lead-out block; 17. inlet pipe; 18. ring ladder; 19. magnet ring; 20. thermal insulation sleeve; 21. fiberglass baffle; 22. water cooling system. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0021] like Figure 1 As shown, the present invention proposes a light source system for calibrating a radiometer, including a collecting shell, wherein a radiation light source 1 is provided at the end of the collecting shell. The radiation light source 1 can be provided in a variety of ways, including fluorescent lamps, heating wires, incandescent lamps, gas discharge lamps, etc., which are suitable for calibrating different radiometers.

[0022] The aggregation shell includes a multi-band reflective layer 2 and a thermal insulation shell 3, a cooling channel 4 is formed between the thermal insulation shell 3 and the multi-band reflective layer 2, a light outlet 5 is provided at the other end of the multi-band reflective layer 2, and a uniform light channel is connected to the light outlet 5. The multi-band reflective layer 2 and the thermal insulation shell 3 have the same shape, including a horizontal section and a U-shaped section, and the inner walls of the horizontal section and the U-shaped section are densely covered with a number of reflective sheets 9 (only a small number of reflective sheets are drawn in the figure, and they are actually distributed throughout the inner wall of the multi-band reflective layer), as shown in FIG. Figure 2 As shown, the reflector 9 is used to reflect the light from the light source to the light outlet 5 . The function of the reflector 9 is to reflect the light radiation and thermal radiation of the radiation light source 1 to the light outlet 5 of the multi-band reflective layer 2 . Since the sizes and shapes of different light sources are different, each time the light source is replaced, it is necessary to fine-tune the angles of different reflective sheets 9 to ensure that the light radiation and heat radiation can be reflected to the light outlet 5 as much as possible. The reflective sheet 9 is set to an adjustable form. The reflective sheet 9 includes a silver square sheet, and a raised insertion block 10 is provided on the back of the square sheet. The insertion block 10 is provided with a socket. A U-shaped seat 11 is provided on the multi-band reflective layer 2. The insertion block 10 is inserted into the U-shaped seat 11 and connected by a pin 12. A spring 13 is provided on one side of the square sheet to connect with the multi-band reflective layer 2, and a ferromagnetic sheet 15 is provided on the other side. An electromagnet 14 is provided on the outside of the gathering shell corresponding to the ferromagnetic sheet 15, and the magnetic end of the electromagnet 14 is even on the inner side of the multi-band reflective layer 2, corresponding to the ferromagnetic sheet 15. The magnetism of the electromagnet 14 is controlled by adjusting the current, and the reflective sheet 9 is pulled in cooperation with the spring 13 to adjust the folding angle of the reflective sheet 9 to adapt to the light source convergence problem after the light source is replaced.

[0023] In order to ensure that different light transmission bands can be adjusted when light is emitted from the light outlet 5, a filter 6 is particularly provided between the light uniforming channel and the light outlet 5. Different filters 6 are placed according to different calibration requirements to adjust the light irradiance. In addition, it should be noted that: the filter 6 is clamped on the inner wall of the hollow block 8, and the inner ring of the hollow block 8 is provided with an annular step 18. The filter 6 is located on the annular step 18 and is pressed with a magnet ring 19. The filter 6 is pressed on the annular step 18 in the form of the magnet ring 19, and the replacement is extremely convenient. The magnet ring 19 and the magnetic step attract each other, and the filter 6 can be fixed. Compared with the traditional fixing method, the adjustability is better.

[0024] Since the heat generated by the light source is relatively high during the entire calibration process, the entire aggregation shell includes a multi-band reflective layer 2 and a thermal insulation shell 3. A water cooling system 22 is connected between the thermal insulation shell 3 and the multi-band reflective layer 2. The water cooling system 22 can pass cold water to achieve cooling, and the thermal insulation shell 3 can be made of high-strength fiberglass to achieve temperature isolation. The high temperature in the lower end reflective layer of the inner layer is greatly reduced by the water cooling system 22. It should be particularly noted that after the light source is gathered at the light outlet 5, the heat at the light outlet 5 is much greater than the overall heat of the multi-band reflective layer 2. Therefore, a high heat dissipation block 7 is provided at the end of its horizontal section, such as Figure 1 , Figure 3 As shown, the high heat dissipation block 7 includes a hollow block 8, a temperature sensor is arranged inside the hollow block 8, the hollow block 8 is connected with the cooling channel 4, the temperature sensor is used to measure the temperature of the position in real time, if ultra-high temperature occurs, the cold water is accelerated to enter, and the hollow block 8 is an annular structure, on the one hand, in order to match the shape of the light outlet 5, and connected and fixed to the thermal insulation shell 3 through a flange, and the multi-band reflection layer 2 is pressed on the hollow block 8, and the surface of the hollow block 8 is provided with water, and the water outlet corresponds to the cooling channel 4, on the other hand, a plurality of lead-out blocks 16 are arranged on the outside of the hollow block 8, and at least two groups of inlet and outlet blocks are provided with introduction pipes 17, and a plurality of lead-out blocks 16 are arranged at the position of the light outlet 5, and the lead-out block 1 6 is integrally formed with the hollow block 8, and can divert the cooling water in the hollow block 8, increase the water flow rate, so as to reduce the problem. At the same time, an inlet pipe 17 is added to the outlet block 16, and an external water cooling system 22 is connected. When the sensor senses high temperature, the outlet pipe is controlled to enter cold water to further control the temperature. In addition, in the present invention, multiple water inlets and outlets are arranged on both sides of the hollow block 8, which are directly connected to the cooling channel 4 respectively, rather than external water pipes, to reduce the water pipe settings to ensure the reasonable shape of the entire equipment, and increase the water flow rate. Compared with the traditional water pipe setting, the water flow rate is increased by at least 2 times, which greatly increases the cooling effect. At the same time, the water cooling space of the uniform light channel is also connected to form a front-to-back connected refrigeration form.

[0025] Specifically, a thermal insulation sleeve 20 is provided on the outside of the uniform light channel, and the thermal insulation sleeve 20 is connected to the hollow block 8 by a flange, and a water-cooling space is formed between the thermal insulation sleeve 20 and the uniform light channel, and the water-cooling space is connected to the hollow block 8. The function of the uniform light channel is to reflect the concentrated light source through the uniform light arm multiple times before transmitting, so as to ensure uniform light output. A reflective coating is provided on the inner wall of the uniform light channel, which can be polytetrafluoroethylene, etc. Of course, the uniform light channel also needs to be cooled, so the uniform light channel is also connected to the hollow block 8, and cooling is achieved by passing cold water therein.

[0026] In addition, traditional light sources usually have a baffle at the end of the uniform light channel to limit external background radiation and ensure zero background calibration conditions during radiometer calibration. The baffle must also be connected to the water cooling system 22, which adds another step to the water cooling system 22. In the present design, a baffle is also provided, but no water cooling is required. It is only necessary to adjust the angle of the reflector 9 mentioned above to ensure that the light source reflection is not concentrated. In this way, only a small amount of light source heat is generated. The baffle is a fiberglass baffle 21, which can completely withstand the heat. After the radiometer is calibrated to zero background, it is only necessary to input a preset current to adjust the reflector 9 to a preset angle to achieve convergent output of the light source, thereby greatly reducing the structure of the water cooling equipment and increasing the compactness of the equipment.

Claims

1. A light source system for calibrating a radiometer, comprising a collection shell, a radiation light source is arranged at the end of the collection shell, the collection shell comprises a multi-band reflection layer and a thermal insulation shell, a cooling channel is formed between the thermal insulation shell and the multi-band reflection layer, a light outlet is arranged at the other end of the multi-band reflection layer, and a uniform light channel is connected to the light outlet, characterized in that: The inner wall of the multi-band reflection layer is densely covered with a plurality of reflection sheets, and the reflection sheets are used to reflect the light from the light source and converge it to the light outlet. A filter is provided between the light uniforming channel and the light outlet. The multi-band reflective layer includes a horizontal section and a U-shaped section, a high heat dissipation block is provided at the end of the horizontal section, the high heat dissipation block includes a hollow block, a temperature sensor is provided in the hollow block, and the hollow block is connected to the cooling channel; The reflector sheet comprises a silver square sheet body, a raised insertion block is provided on the back of the square sheet body, a socket is provided on the insertion block, a U-shaped seat is provided on the multi-band reflective layer, the insertion block is inserted into the U-shaped seat and connected by a latch, a spring is provided on one side of the square sheet body to connect with the multi-band reflective layer, and a ferromagnetic sheet body is provided on the other side, and an electromagnet is provided on the outside of the aggregation shell corresponding to the ferromagnetic sheet body.

2. The radiometer calibration light source system according to claim 1, characterized in that: The hollow block is an annular structure and is connected to the thermal insulation shell through a flange. A plurality of lead-out blocks are arranged outside the hollow block, and at least two groups of inlet and outlet blocks are provided with introduction pipes.

3. The radiometer calibration light source system according to claim 1, characterized in that: The optical filter is clamped on the inner wall of the hollow block, an annular step is arranged in the inner ring of the hollow block, the optical filter is located on the annular step and is pressed with a magnet ring.

4. The radiometer calibration light source system according to claim 1, characterized in that: A thermal insulation sleeve is provided outside the light homogenizing channel, the thermal insulation sleeve is connected to the hollow block through a flange, and a water cooling space is formed between the thermal insulation sleeve and the light homogenizing channel, and the water cooling space is communicated with the hollow block.

5. The radiometer calibration light source system according to claim 2, characterized in that: The cooling channel is connected to a water cooling system, and the water cooling system allows cold water to enter the cooling channel.

6. The radiometer calibration light source system according to claim 5, characterized in that: The water cooling system is connected to the temperature-insulating housing.

7. The radiometer calibration light source system according to claim 1, characterized in that: A glass fiber reinforced plastic baffle is provided at the end of the light uniforming channel.

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