A high-matching ultraviolet band solar simulator

Abstract

A highly matched ultraviolet band solar simulator belongs to the field of solar simulator light sources, and is characterized in that: it includes a light source composed of a low-pressure mercury lamp and an ultraviolet LED lamp; the low-pressure mercury lamp and the ultraviolet LED lamp are arranged alternately; the spectral band of the low-pressure mercury lamp is 280‑360nm; the spectral band of the ultraviolet LED lamp is 340‑410nm. By improving the existing solar simulator, a low-pressure mercury lamp (UVA) and an ultraviolet LED lamp are organically combined to form a light source, and a better match with the standard solar spectrum is achieved in the 280‑400nm band. The low-pressure mercury lamp (UVA) is used to replace the expensive LED lamp beads in the 280‑360nm band, thereby saving costs; at the same time, the ultraviolet LED lamp makes up for the insufficient spectrum of the low-pressure mercury lamp (UVA), and achieves a perfect match with the standard solar spectrum. The structure is simple, easy to operate, and suitable for popularization and application.

Description

Technical Field

[0001] The invention belongs to the field of solar simulator light sources, and in particular relates to a high-matching ultraviolet band solar simulator. Background Art

[0002] In the process of production and scientific research, various materials and devices used outdoors and indoors need to be subjected to UV aging tests, which requires the use of UV lighting devices.

[0003] In the prior art, commonly used ultraviolet light sources include low-pressure mercury lamps (UVA, UVB) and metal halide lamps. As they are used, the spectrum will drift significantly. In addition, the matching degree between the 280-400nm band and the standard solar spectrum AM1.5 or AM1.0 is quite different, and the matching degree is low. In addition, the differences between different light sources are also very large, which often results in large differences in the test results of the same material on different ultraviolet aging equipment and poor compatibility between different testing institutions. At the same time, when using an ultraviolet light source that is very different from the standard solar spectrum, the light aging test results will deviate greatly from the actual usage. Summary of the invention

[0004] The present invention aims to solve the above-mentioned problem and provide a high-matching ultraviolet band solar simulator that makes the ultraviolet light aging test effect more consistent with the actual ground usage.

[0005] The high-matching ultraviolet band solar simulator of the present invention comprises a light source composed of a low-pressure mercury lamp and an ultraviolet LED lamp; The low-pressure mercury lamps and ultraviolet LED lamps are arranged alternately, so that the light of the low-pressure mercury lamps and the LED lamps can achieve better irradiation uniformity, thereby reducing the problem of large spectrum differences in different areas; The spectrum band of the low-pressure mercury lamp is 280-360nm; the spectrum band of the ultraviolet LED lamp is 340-410nm. The low-pressure mercury lamp (UVA) mainly contributes to the spectrum of the 280-360nm band; the ultraviolet LED lamp is used to make up for the deficiency of the low-pressure mercury lamp (UVA) in the 280-400nm spectrum band compared with the standard spectrum, and achieves a good match between the 280-400nm band and the standard solar spectrum AM1.5 or AM1.0, so that the ultraviolet light aging test effect is more consistent with the actual use on the ground.

[0006] Furthermore, in the highly matched ultraviolet band solar simulator of the present invention, the ultraviolet LED lamp is a mixture of three lamp beads with peak wavelengths of 360-370nm, 380-390nm, and 390-410nm. These three bands of LED lamp beads are cost-effective and can be well matched with the spectrum of low-pressure mercury lamps.

[0007] Furthermore, in the high-matching ultraviolet band solar simulator of the present invention, the optical power ratio of the three lamp beads is 1:m:n; wherein, 1≤m≤2, 1≤n≤4.

[0008] Furthermore, the high-matching ultraviolet band solar simulator of the present invention further includes a concave-convex reflector; The concave-convex reflector is located on the backlight side of the aforementioned low-pressure mercury lamp and ultraviolet LED lamp; The low-pressure mercury lamp is arranged at the concave point of the concave-convex reflector; The ultraviolet LED lamp is arranged at the convex point of the concave-convex reflector.

[0009] Since the ultraviolet LED lamp is greatly affected by the ambient temperature, setting it at the convex point is conducive to heat dissipation, thereby increasing the service life; and setting the low-pressure mercury lamp at the concave point can avoid blocking the light beam of the ultraviolet LED lamp and improve the lighting simulation effect of the simulator.

[0010] Furthermore, in the high-matching ultraviolet band solar simulator of the present invention, the specifications of the concave-convex reflector are as follows: assuming that the diameter of the low-pressure mercury lamp is R, the depth d of the concave-convex reflector is in the range of R / 2-3R; the opening width k of the concave-convex reflector is in the range of 2R-8R.

[0011] Furthermore, the high-matching ultraviolet band solar simulator of the present invention further includes a spectrum testing unit and a control and storage unit; The spectrum testing unit is electrically connected to the aforementioned control and storage unit; The control and storage unit is electrically connected to the aforementioned low-pressure mercury lamp and ultraviolet LED lamp.

[0012] Furthermore, the high-matching ultraviolet band solar simulator of the present invention further includes a concave-convex reflector; The concave-convex reflector is located on the backlight side of the aforementioned low-pressure mercury lamp and ultraviolet LED lamp; The low-pressure mercury lamp is arranged at the concave point of the concave-convex reflector; The ultraviolet LED lamp is arranged at the convex point of the concave-convex reflector.

[0013] Furthermore, in the high-matching ultraviolet band solar simulator of the present invention, the specifications of the concave-convex reflector are as follows: assuming that the diameter of the low-pressure mercury lamp is R, the depth d of the concave-convex reflector is in the range of R / 2-3R; the opening width k of the concave-convex reflector is in the range of 2R-8R.

[0014] Furthermore, in the high-matching ultraviolet band solar simulator of the present invention, the spectrum test unit is used to monitor the spectrum of the test light source; When the test result exceeds the threshold, the spectrum test unit sends a feedback signal to the aforementioned control and storage unit; After receiving the feedback signal, the control and storage unit adjusts the light source according to a preset scheme.

[0015] Furthermore, in the high-matching ultraviolet band solar simulator of the present invention, when the spectral testing unit monitors the test light source, the 280nm-400nm band is divided into an interval of 20nm, and then the spectral matching in each interval is monitored; a more rigorous and detailed UV band spectral matching evaluation scheme is provided.

[0016] Furthermore, in the high-matching ultraviolet band solar simulator of the present invention, the control and storage unit independently adjusts the low-pressure mercury lamp and the ultraviolet LED lamp when adjusting the light source. Because the spectrum of the lamp tube constituting the light source will drift and change to a certain extent with the remaining life, this solution can ensure that the spectrum matching of the UV band light is still maintained after the spectrum of the individual lamp tube drifts by independently adjusting the power of each light source, thereby providing a high-matching ultraviolet band solar simulator.

[0017] The high-matching ultraviolet band solar simulator of the present invention improves the existing solar simulator, adopts a low-pressure mercury lamp (UVA) and an ultraviolet LED lamp to form a light source, and achieves a better match with the standard solar spectrum in the 280-400nm band. The low-pressure mercury lamp (UVA) is used to replace the expensive LED lamp beads in the 280-360nm band, thereby saving costs; at the same time, the ultraviolet LED lamp makes up for the spectrum deficiency of the low-pressure mercury lamp (UVA), achieving a perfect match with the standard solar spectrum, with a simple structure, easy operation, and suitable for popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front view of the high-matching ultraviolet band solar simulator described in an embodiment of the present invention; Figure 2 This is a side view of a high-matching ultraviolet band solar simulator according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the concave-convex reflector plate according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the arrangement structure of the ultraviolet LED lamp according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the arrangement structure of the ultraviolet LED lamp according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the spectrum test unit and the control and storage unit according to an embodiment of the present invention; Figure 7 This is a test effect diagram of a high-matching ultraviolet band solar simulator according to an embodiment of the present invention; Among them, 1-light box, 2-UV reflector, 3-low-pressure mercury lamp, 4-ultraviolet LED lamp, 5-air inlet channel, 6-air outlet channel, 7-solar cell to be tested, 8-concave-convex reflector, 9-heat dissipation part, 10-lamp bead 1, 11-lamp bead 2, 12-lamp bead 3, 13-human-computer interaction unit, 14 control and storage unit, 15-power supply execution unit, 16-spectrum test unit. DETAILED DESCRIPTION

[0019] The highly matched ultraviolet band solar simulator of the present invention is described in detail below through the accompanying drawings and embodiments.

[0020] Embodiment 1 This embodiment discloses a high-matching ultraviolet band solar simulator, the light source and the light box 1 of which are structured as follows: Figure 1 As shown, one end of the light box 1 is open, and the light source consists of a low-pressure mercury lamp 3 and an ultraviolet LED lamp 4; the low-pressure mercury lamp 3 and the ultraviolet LED lamp 4 are staggered at the closed end of the light box 1; the low-pressure mercury lamp 3 and the ultraviolet LED lamp 4 are alternately arranged; thereby, the light of the low-pressure mercury lamp 3 and the LED lamp can achieve better irradiation uniformity, thereby reducing the problem of large spectral differences in different regions; the spectral band of the low-pressure mercury lamp 3 is 280-360nm; the spectral band of the ultraviolet LED lamp 4 is 340-410nm.

[0021] In the disclosed embodiment, 17 low-pressure mercury lamps 3 and 416 ultraviolet LED lamps are arranged at equal intervals of 75 mm. At the same time, in order to better reflect ultraviolet light, the inner wall of the light box 1 adopts a UV reflector 2. In this case, the UV reflector 2 is made of a mirror aluminum plate. At the same time, the simulator described in this embodiment is also provided with two ventilation channels, which serve as an air inlet and an air outlet respectively. Fans are installed on the ventilation channels to dissipate heat inside the light box 1. The fan blows inward through the air inlet channel 5, and the fan blows outward through the air outlet channel 6 to achieve heat dissipation.

[0022] The ultraviolet LED lamp 4 is composed of three lamp beads with peak wavelengths of 360-370nm, 380-390nm, and 390-410nm. In the embodiment of the present disclosure, the lamp beads of the ultraviolet LED lamp 4 are as follows: Figure 4 The arrangement shown is divided into 4 groups, each group has three different colors of lamp beads, the quantity ratio is 1:2:2, but the light power ratio is: 1:1:2; each group consists of 5 LED lamp beads, including 1 LED lamp bead 10 with a peak wavelength of 360-370nm, 2 LED lamp beads 11 with a peak wavelength of 380-390nm, and 2 LED lamp beads 12 with a peak wavelength of 390-410nm. Such staggered distribution of LED lamp beads can make the spectrum more uniform.

[0023] You can also use Figure 5 The arrangement of the lamp beads shown is divided into 4 groups, each group contains three different colors of lamp beads. This arrangement helps each color of LED lamp beads to have better irradiation uniformity. This arrangement is also easier to route.

[0024] It should be noted that in specific applications, the inventor can adjust the arrangement of the three types of lamp beads according to actual practical scenarios and needs to adapt to corresponding application scenarios.

[0025] During operation, the light emitted by the low-pressure mercury lamp 3 and the ultraviolet LED lamp 4 is mixed in the light box 1 and irradiated onto the sample to be tested to achieve a good match between the 280-400nm band and the standard solar spectrum AM1.5 or AM1.0, making the ultraviolet light aging test effect more consistent with the actual use on the ground.

[0026] Embodiment 2 Based on the above-mentioned embodiment 1, the difference of the high-matching ultraviolet band solar simulator disclosed in this embodiment is that it also includes a concave-convex reflector 8; Figure 2 As shown, the concave-convex reflector 8 is located on the backlight side of the aforementioned low-pressure mercury lamp 3 and the ultraviolet LED lamp 4; the low-pressure mercury lamp 3 is arranged at the concave point of the concave-convex reflector 8; the ultraviolet LED lamp 4 is arranged at the convex point of the concave-convex reflector 8; and the solar cell 7 to be tested is arranged on the lighting direction side of the aforementioned low-pressure mercury lamp 3 and the ultraviolet LED lamp 4.

[0027] In the disclosed embodiment, the specifications of the concave-convex reflector 8 are as follows: Figure 3 As shown, assuming that the diameter of the low-pressure mercury lamp 3 is R, the depth d of the concave-convex reflector 8 is in the range of R / 2-3R; the opening width k of the concave-convex reflector 8 is in the range of 2R-8R. If the depth d of the concave-convex reflector 8 is too large or too small, the low-pressure mercury lamp 3 and the LED lamp beads will easily block each other's light, and the same is true for the opening width K.

[0028] Since the ultraviolet LED lamp 4 is greatly affected by the ambient temperature, setting it at a convex point is conducive to heat dissipation, thereby increasing the service life; and setting the low-pressure mercury lamp 3 at a concave point avoids blocking the light beam of the ultraviolet LED lamp 4, thereby improving the lighting simulation effect of the simulator. In the disclosed embodiment, a heat dissipation part 9 is provided between the concave-convex reflector 8 and the light box 1, and the heat dissipation part 9 can adopt air cooling or water cooling according to actual conditions.

[0029] Embodiment 3 Based on the above-mentioned embodiment 1 and embodiment 2, the high-matching ultraviolet band solar simulator disclosed in this embodiment further includes a spectrum testing unit 16 and a control and storage unit 14; Figure 6As shown, the spectrum test unit 16 is electrically connected to the aforementioned control and storage unit 14 ; the control and storage unit 14 is electrically connected to the aforementioned low-pressure mercury lamp 3 and ultraviolet LED lamp 4 of the lamp box 1 .

[0030] In the embodiments of the present disclosure, Figure 6 As shown, the human-machine interaction unit 13, the control and storage unit 14, the power supply execution unit 15 and the light box 1 are connected in sequence. These components are already mature existing technologies on the market. The human-machine interaction unit 13 can adjust the output power of each light source through the operator, and can be a knob, a display, or a touch screen. The control and storage unit 14 stores, analyzes and transmits the information instructions transmitted by the human-machine interaction unit 13, and can be a computer or a PLC controller. The power supply execution unit 15 supplies power to the light box 1 and controls the output power of the light box 1. It is composed of a power supply POWER and a number of control circuits. The control circuit includes MOS tubes, thyristors, IGBTs and other devices. In the example disclosed in the present invention, Figure 6 As shown, G1 and G2 are the control circuits of the low-pressure mercury lamp 3, and L1, L2, and L3 are the control circuits of the ultraviolet LED lamp 4. The control circuit increases or decreases the resistance in the circuit loop where the power supply POWER and each light source in the light box 1 are located, so as to independently adjust the output power of each light source in the light box 1. The above functions can also be achieved by using a number of constant current / constant voltage power supplies that integrate the power supply POWER and the control circuit, such as the Mean Well LRS-350 series power supply.

[0031] The spectrum test unit 16 in the embodiment of the present disclosure is used to monitor the spectrum of the light source in the light box 1. When the test result exceeds the threshold, the spectrum test unit 16 sends a feedback signal to the control and storage unit 14; after receiving the feedback signal, the control and storage unit 14 adjusts the light source according to the preset scheme. This ensures that the spectrum will not drift significantly as the life of the light source decreases. Of course, after receiving the feedback signal, the control and storage unit 14 can also only give an information prompt, in which case manual intervention is required to adjust the power of each light source.

[0032] like Figure 7 As shown, the high-matching ultraviolet band solar simulator described in this embodiment is used, and the low-pressure mercury lamp 3 and the LED lamp are organically combined to achieve a matching degree with the standard solar spectrum in the 280-400nm band, and the measured effect is good.

[0033] In the disclosed embodiment, when the spectrum is monitored by the spectrum test unit 16, the method is as follows: the 280nm-400nm band is divided into an interval every 20nm, and the spectrum matching degree in each interval is examined. The spectrum proportion of each interval achieved by this technical solution is compared with the spectrum proportion of the corresponding interval of the standard sun, that is, the spectrum matching degree. The comparison results of this embodiment and the AM1.5 standard spectrum are as follows: As can be seen from the above table, the maximum positive deviation is 11%, and the maximum negative deviation is -5%, both of which are less than the A+ level requirement of ±12.5%, which is enough to show that the actual effect of this technical solution is very good.

[0034] The high-matching UV band solar simulator described in this embodiment uses a low-pressure mercury lamp 3 to replace the expensive 280-360nm band LED lamp beads, thereby saving costs; the UV LED lamp 4 fills the insufficient part (360-400nm) of the output power of the low-pressure mercury lamp 3, achieves a perfect match with the standard spectrum, and improves the overall UV radiation power density, which is conducive to accelerating the progress of UV aging and saving aging time.

Claims

1. A highly matched ultraviolet band solar simulator, characterized in that: A light source comprising a low-pressure mercury lamp and an ultraviolet LED lamp; The low-pressure mercury lamps and ultraviolet LED lamps are arranged alternately; The spectral band of the low-pressure mercury lamp is 280-360nm; the spectral band of the ultraviolet LED lamp is 340-410nm.

2. The high-matching ultraviolet band solar simulator according to claim 1, characterized in that: The ultraviolet LED lamp is a mixture of three lamp beads with peak wavelengths of 360-370nm, 380-390nm, and 390-410nm.

3. The high-matching ultraviolet band solar simulator according to claim 2, characterized in that: The optical power ratio of the three types of lamp beads is 1:m:n; wherein, 1≤m≤2, 1≤n≤4.

4. The high-matching ultraviolet band solar simulator according to claim 1 or 3, characterized in that: Also includes concave and convex reflectors; The concave-convex reflector is located on the backlight side of the aforementioned low-pressure mercury lamp and ultraviolet LED lamp; The low-pressure mercury lamp is arranged at the concave point of the concave-convex reflector; The ultraviolet LED lamp is arranged at the convex point of the concave-convex reflector.

5. The high-matching ultraviolet band solar simulator according to claim 4, characterized in that: The specifications of the concave-convex reflector are as follows: assuming that the diameter of the low-pressure mercury lamp is R, the depth d of the concave-convex reflector is in the range of R / 2-3R; and the opening width k of the concave-convex reflector is in the range of 2R-8R.

6. The high-matching ultraviolet band solar simulator according to claim 1, 2 or 3, characterized in that: Also includes a spectrum test unit and a control and storage unit; The spectrum testing unit is electrically connected to the aforementioned control and storage unit; The control and storage unit is electrically connected to the aforementioned low-pressure mercury lamp and ultraviolet LED lamp.

7. The high-matching ultraviolet band solar simulator according to claim 6, characterized in that: Also includes concave and convex reflectors; The concave-convex reflector is located on the backlight side of the aforementioned low-pressure mercury lamp and ultraviolet LED lamp; The low-pressure mercury lamp is arranged at the concave point of the concave-convex reflector; The ultraviolet LED lamp is arranged at the convex point of the concave-convex reflector; The specifications of the concave-convex reflector are as follows: assuming that the diameter of the low-pressure mercury lamp is R, the depth d of the concave-convex reflector is in the range of R / 2-3R; and the opening width k of the concave-convex reflector is in the range of 2R-8R.

8. The high-matching ultraviolet band solar simulator according to claim 6, characterized in that: The spectrum testing unit is used to monitor the spectrum of the test light source; When the test result exceeds the threshold, the spectrum test unit sends a feedback signal to the aforementioned control and storage unit; After receiving the feedback signal, the control and storage unit adjusts the light source according to a preset scheme.

9. The high-matching ultraviolet band solar simulator according to claim 8, characterized in that: When the spectrum test unit monitors the test light source, the wavelength band of 280nm-400nm is divided into an interval every 20nm, and then the spectrum matching degree in each interval is monitored.

10. The high-matching ultraviolet band solar simulator according to claim 9, characterized in that: When the control and storage unit adjusts the light source, the low-pressure mercury lamp and the ultraviolet LED lamp are independently adjusted respectively.

Images