TWI848792B - Light source system - Google Patents

Abstract

A light source system includes: a xenon lamp; an elliptical reflector; a first plane reflector; a homogenizer; a second plane reflector; an optical lens; a power supply; an aperture; a photo sensor; a first drive device connected to the xenon lamp or the elliptical reflector; a second drive device connected to the aperture; and a control device connected to the photo sensor, the power supply, the first drive device and the second drive device; wherein the control device controls the power supply, the first drive device and the second drive device according to the properties of the analog light source sensed by the photo sensor. The light source system of the present invention is suitable for providing a simulated light source with intensity, stability, uniformity and spectrum similar to that of sunlight.

Description

Light source system

The present invention relates to a light source system, in particular to a light source system including a control device.

Global climate change has become a crisis for human survival, so countries around the world are making every effort to develop green energy, and solar power generation plays a core role. The technology of silicon-based solar cells has matured, and its photoelectric conversion efficiency has reached a bottleneck. Therefore, most scientists and researchers are currently focusing on developing new solar cells with higher photoelectric conversion efficiency, such as calcium-titanium-crystalline silicon stacked solar cells and multi-junction cells.

As the type of solar cells evolves from "single junction" cells to "stacked" and "multi-junction" cells, the demand for solar simulators that can provide perfect AM1.5G spectrum and adjustable spectrum is increasing day by day in response to the requirements of test conditions, and gradually becomes a necessary condition.

IEC 60904 is a world-recognized international standard for the quality of solar simulators. IEC 60904 specifies three indicators for evaluating the quality of solar simulators, namely "spatial irradiance uniformity", "irradiance intensity stability" and "spectral consistency". These three indicators are often referred to as "light uniformity", "light stability" and "spectrum".

Looking at the solar simulators of various brands currently on the market, if a single xenon lamp is used as the light source, the best light uniformity, light stability, and spectral performance level are mostly at the AAA level. If it is to achieve the A+ level, especially the "spectral consistency" indicator, none of the single xenon lamp bulbs with existing technology can currently meet this standard.

In order to achieve spectral matching of A+ (or even better than A+) and meet the requirements for measuring stacked and multi-junction solar cells, many manufacturers have turned to developing "multi-light" systems. By combining two or more light sources with different wavelength ranges, cutting off the strengths to make up for the weaknesses or using wavelength splicing, the spectral matching can reach or exceed the A+ level.

Whether it is a dual-lamp (xenon lamp + halogen lamp) solar simulator or an LED solar simulator, it belongs to a "multi-lamp" light source system. Although the spectrum of the multi-lamp system is adjustable, the service life of each light source is inconsistent, resulting in the system inevitably needing frequent calibration.

Take the dual-lamp system (xenon lamp + halogen lamp) as an example: for the measurement of solar cells, its light source must meet the specifications of IEC 60904, and the light intensity must reach one solar light intensity (1 sun), that is, 1000W/ ^m2 or more, to meet the STC test conditions. According to actual statistics, the usable hours of halogen lamps (QTH) are less than 50 hours. Once it exceeds 50 hours, although the bulb will still light up, it is no longer possible for the dual-lamp system to reach the 1000W/ ^m2 standard of irradiation intensity, so new lamps need to be replaced frequently.

Take the LED light source system as an example: Although the life of LED light sources is said to be "tens of thousands of hours", this can only be achieved under the premise of appropriate junction temperature (Tj), such as: Tj < 85℃ or Tj < 105℃. Once the use conditions cause Tj to be too high, the life of the LED will decline rapidly, or even burn out. This is why the LED light source system must be equipped with a cooling module for the LED light panel. We tested many commercially available LED solar simulators, all of which claimed that their irradiance intensity specifications were greater than 1.2 sun (i.e. greater than 1200W/ ^m2 ), but we found that: less than 1500 hours, their maximum light intensity could not exceed 1000W/ ^m2 . To comply with IEC light intensity regulations, LED lamp beads need to be overdriven, which undoubtedly worsens the operating conditions of LED light sources and increases the risk of excessive Tj.

Furthermore, the LED light source system is composed of many LED lamp beads of different wavelengths. In short, the aging speed of RGB LED lamp beads is different. After lighting, they must face different dynamic changes in the decay speed. From many usage experiences, it is found that its long-term spectral stability is not good.

Finally, through market research, when the performance of LED light sources/lamp panels declines, it is very difficult to repair a single lamp bead, and the entire set can only be replaced. In addition, the cost of LED light sources/lamp panels accounts for 40%~50% of the entire LED simulator system, resulting in users having to bear extremely high cost pressure.

From this, we can see that the dual-lamp system solar simulator and the LED light source system solar simulator each have their own insurmountable product weaknesses. Therefore, there is a need to develop a novel light source system to solve the above problems.

The technical problem to be solved by the present invention is to provide a light source system to address the deficiencies of the existing technology.

The innovation of this invention lies in that the coating design on the optical element makes the reflected and transmitted spectrum of the optical element change significantly with the different angles of the incident light, thereby achieving the use of a single bulb light source, adjusting the spatial position and angle of the optical element, and changing the spectrum output by the solar simulator.

Although it is known that the reflectivity spectrum changes with the angle of incidence, there are infinite possibilities for what coating material and optical path design to use, the selection of optical components, the control range of the spatial position and angle of optical components, etc. Non-obvious designs and combinations can achieve the requirements of 3A solar simulator light source output performance (IEC 60904-9:2017; light intensity 1000W/ ^m2 , spatial uniformity <2%, light intensity instability <1%; spectrum can achieve IEC 60904-3 matching).

As shown in Figure 1, the phenomenon that the transmitted spectrum changes at different incident angles (which can be used in the homogenizer and optical lens in this case) is used in the design of the solar simulator to achieve an innovative device with a single light source and adjustable spectrum.

Figure 1 shows the transmission spectra after the designed optical film at incident angles of 0 and 45 degrees. It can be clearly seen in the figure that the spectrum at an incident angle of 45 degrees has a significant "blue shift" phenomenon (the peak is blue-shifted from 550nm to 500nm).

As shown in Figures 2 and 3, by utilizing the design of the reflective coating of the reflector (film thickness, material) and controlling the angle of the incident light, the spectrum of the reflected light can be adjusted. When used in the design of a solar simulator, an innovative device with a single light source and adjustable spectrum can be achieved.

As shown in Figure 2, the optical coating thickness of the optical reflector (elliptical reflector, plane reflector) can change the optical reflectivity of different bands (i.e. the intensity of reflected light in each band).

As shown in Figure 3, changing the angle of the incident light can change the optical reflectance spectrum of different bands (reference: DOI: 10.1109/JPHOT.2013.2278983).

The technical solution adopted in this innovation case uses selected (specific) optical components (lenses, reflectors), applies specific optical coating treatment (film thickness, material), and uses a specific combination of optical components (short arc xenon lamp, elliptical reflector, first reflector, mechanical aperture, homogenizer, second reflector, first optical lens) and a drive device (1st to nth drive device) to control the angle of the xenon lamp beam incident on each optical component. After changing the spectrum after reflection (or transmission) at different angles, the spectrum is modulated, and the quality of the beam output by the entire solar simulator (spectrum, uniformity, light intensity) is adjusted and controlled to meet the requirements of the solar simulator required by the IEC 60904-9 international standard.

The optical coating material mentioned above can be metal oxides, such as tantalum pentoxide (Ta ₂ O ₅ ) and/or aluminum oxide (Aluminum Oxide (Al ₂ O ₃ )) and other dielectric materials, and metal materials, as shown in Table 1 below.

The above-mentioned number of layers can be a single layer or a combination of multiple layers of different materials.

The above coating methods can be evaporation deposition, ion beam sputtering (IBS), plasma sputtering, atomic layer deposition, sub-wavelength structure surface or mixed coating of the above methods.

In order to solve the above technical problems, one of the technical solutions adopted by the present invention is a light source system, which includes: a xenon lamp; an elliptical reflector, which is arranged at a position adjacent to the xenon lamp to reflect the light source emitted by the xenon lamp; a homogenizer, which is arranged on the path of the light source reflected by the elliptical reflector; an optical lens, which is arranged on the path of the light source homogenized by the homogenizer to refract the light source to output a simulated light source; A power supply electrically connected to the xenon lamp; a first driving device connected to the xenon lamp or the elliptical reflector to drive the xenon lamp or the elliptical reflector to change the relative position between the xenon lamp and the elliptical reflector; and a control device connected to the power supply and the first driving device; wherein the control device controls the power supply and the first driving device according to the properties of the analog light source.

The above-mentioned light source system may further include: a first plane reflector, which is arranged on the path of the light source reflected by the elliptical reflector to reflect the light source reflected by the elliptical reflector to the light homogenizer, and the light homogenizer is arranged on the path of the light source reflected by the first plane reflector; a second plane reflector, which is arranged on the path of the light source homogenized by the light homogenizer to reflect the light source homogenized by the light homogenizer to the optical lens, and the optical lens is arranged on the path of the light source reflected by the first plane reflector. The second plane reflector is disposed on the path of the light source reflected by the second plane reflector; an aperture is disposed between the first plane reflector and the light homogenizer; a photoelectric sensor is disposed on the path of the light source refracted by the optical lens; and a second driving device is connected to the aperture to control the size of the aperture; wherein the control device controls the power supply, the first driving device and the second driving device according to the properties of the simulated light source sensed by the photoelectric sensor.

The above-mentioned light source system, wherein the surface of at least one of the elliptical reflector, the first plane reflector, the light homogenizer and the second plane reflector may have a coating.

In the above-mentioned light source system, the coating layer can be selected from a group consisting of an aluminum reflective film, a silver reflective film, a gold reflective film, a multi-layer dielectric film and a special coating film.

The above-mentioned light source system, wherein the thickness of the coating can be between 1nm and 150μm.

The above-mentioned light source system may further include: a third driving device, which is connected to the first plane reflector to control the angle between the first plane reflector and the incident light source.

The above-mentioned light source system may further include: a fourth driving device connected to the light homogenizer to control the angle between the light homogenizer and the incident light source.

The above-mentioned light source system may further include: a fifth driving device, which is connected to the second plane reflector to control the angle between the first plane reflector and the incident light source.

In the above-mentioned light source system, the curvature of the elliptical reflector can be between 1.4 and 2.25. The curvature of the elliptical reflector is defined as the distance from the opening of the elliptical reflector to the focal point, divided by the opening diameter of the elliptical reflector.

The above-mentioned light source system, wherein the first driving device can drive the xenon lamp or the elliptical reflector to move 10 mm up and down along a z direction.

The above-mentioned light source system, wherein, by the control of the control device, the output power of the power supply can be between 20% and 100% of its maximum output power, and by the control of the control device, the size of the aperture opening can be between 0% and 100% of its maximum value.

Accordingly, the light source system of the present invention can continuously and stably provide a simulated light source with an intensity and spectrum similar to that of sunlight.

To further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only for reference and description and are not used to limit the present invention.

100: Light source system

101: Xenon lamp

102: Elliptical reflector

104: Light homogenizer

106:Optical lens

107: Power supply

110: First driving device

112: Control device

120:Simulated light source

200: Light source system

201: Xenon lamp

202: Elliptical reflector

203: First plane reflector

204: Homogenizer

205: Second plane reflector

206:Optical lens

207: Power supply

208: Aperture

209: Photoelectric sensor

210: First drive device

211: Second drive device

212: Control device

220:Simulated light source

[Figure 1] is a diagram showing the changes in the transmitted light spectrum caused by different incident angles; [Figure 2] is a diagram showing the effects of different optical coating thicknesses on the optical reflectivity of different wavelength bands; [Figure 3] is a diagram showing the effects of different incident light angles on the optical reflectivity spectra of different wavelength bands; [Figure 4] is a schematic diagram of the light source system of embodiment 1 of the present invention; and [Figure 5] is a schematic diagram of the light source system of embodiment 2 of the present invention.

The following is a specific embodiment to illustrate the implementation of the light source system disclosed by the present invention. Those with ordinary knowledge in the technical field to which the present invention belongs can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed in various ways based on different viewpoints and applications without deviating from the concept of the present invention. The following implementation will further explain the relevant technical content of the present invention in detail, but the disclosed content is not used to limit the scope of protection of the present invention.

Implementation Example 1

As shown in FIG. 4 , the light source system 100 of this embodiment includes: a xenon lamp 101; an elliptical reflector 102; a homogenizer 104; an optical lens 106; a power supply 107; a first driving device 110; and a control device 112.

The xenon lamp 101 is used to emit a light source.

The elliptical reflector 102 is disposed at a position adjacent to the xenon lamp 101 to reflect the light source emitted by the xenon lamp 101.

The light homogenizer 104 is disposed on the path of the light source reflected by the elliptical reflector 102 to homogenize the light source. In this embodiment, the angle between the light homogenizer 104 and the incident light is 90°, but the present invention is not limited thereto, and the angle is preferably between 85° and 95°.

The optical lens 106 is disposed on the path of the light source homogenized by the light homogenizer 104 to refract the light source to output a simulated light source 120.

The power supply 107 is electrically connected to the xenon lamp 101 to supply the power required by the xenon lamp 101.

The first driving device 110 is connected to the xenon lamp 101 to drive the xenon lamp 101, thereby changing the relative position between the xenon lamp 101 and the elliptical reflector 102. In this embodiment, the first driving device 110 drives the xenon lamp 101 to move 10 mm up and down along a z direction, but the present invention is not limited thereto, as long as the relative position between the xenon lamp 101 and the elliptical reflector 102 can be changed. In another embodiment, the first driving device 110 is connected to the elliptical reflector 102 to drive the elliptical reflector 102 to move up and down along a z direction, thereby changing the relative position between the xenon lamp 101 and the elliptical reflector 102.

The moving distance of the xenon lamp 101 or the elliptical reflector 102 can be between +-10mm. By changing the distance between the xenon lamp 101 and the elliptical reflector 102, the angle of the light source incident on the homogenizer 104 is changed, thereby changing the spectrum of the light source after homogenization. However, the present invention is not limited to this. The spatial position between the elliptical reflector 102 and the homogenizer 104 or the xenon lamp 101 and the homogenizer 104 can also be adjusted (i.e., the relative position of the two in the x, y or z direction is adjusted) (this also adjusts the angle of the light source incident on the homogenizer 104).

The control device 112 is connected to the power supply 107 and the first driving device 110.

The control device 112 controls the power supply 107 and the first driving device 110 according to the properties of the simulated light source 120.

Specifically, the intensity of the simulated light source 120 can be sensed, and the control device 112 can adjust the output power of the power supply 107 according to the intensity of the simulated light source 120. When the intensity of the simulated light source 120 declines with the service life of the xenon lamp 101, the intensity of the simulated light source 120 can be kept constant by increasing the output power of the power supply 107 in real time. In this embodiment, the output power of the power supply is between 20% and 100% of its maximum output power under the control of the control device, but the present invention is not limited to this.

In addition, the spectrum of the simulated light source 120 can be sensed, and the control device 112 can adjust the position of the xenon lamp 101 according to the spectrum of the simulated light source 120 through the first driving device 110. When the spectrum of the simulated light source 120 deviates from the spectrum of sunlight as the xenon lamp 101 ages, the position of the xenon lamp 101 can be adjusted in real time to keep the spectrum of the simulated light source 120 constant.

In summary, the light source system 100 of this embodiment can make appropriate adjustments to the properties of the simulated light source 120 in real time, so that the light source system 100 can continuously and stably provide the simulated light source 120 with a spectrum consistency of A+ with the sunlight. The light source system 100 of this embodiment has a certain degree of stability. When the light source system 100 is adjusted to the optimal state, its optimal state can be reasonably maintained for a period of time without being out of control immediately.

Example 2

As shown in FIG. 5 , the light source system 200 of this embodiment includes: a xenon lamp 201; an elliptical reflector 202; a first plane reflector 203; a homogenizer 204; a second plane reflector 205; an optical lens 206; a power supply 207; an aperture 208; a photoelectric sensor 209; a first driving device 210; a second driving device 211; and a control device 212.

The xenon lamp 201 is used to emit a light source.

The elliptical reflector 202 is disposed at a position adjacent to the xenon lamp 201 to reflect the light source emitted by the xenon lamp 201.

Compared to Embodiment 1, the light source system 200 of this embodiment further includes: a first plane reflector 203. The first plane reflector 203 is disposed on the path of the light source reflected by the elliptical reflector 202 to reflect the light source reflected by the elliptical reflector 202. In this embodiment, the angle between the first plane reflector 203 and the incident light is 45°, but the present invention is not limited thereto, and the angle is preferably between 40° and 50°.

The light homogenizer 204 is disposed on the path of the light source reflected by the first plane reflector 203 to homogenize the light source. In this embodiment, the angle between the light homogenizer 204 and the incident light is 90°, but the present invention is not limited thereto, and the angle is preferably between 85° and 95°.

Compared with Embodiment 1, the light source system 200 of this embodiment further includes: a second plane reflector 205. The second plane reflector 205 is disposed on the path of the light source homogenized by the light homogenizer 204 to reflect the light source homogenized by the light homogenizer 204. In this embodiment, the angle between the second plane reflector 205 and the incident light is 45°, but the present invention is not limited thereto, and the angle is preferably between 40° and 50°.

The optical lens 206 is disposed on the path of the light source reflected by the second plane reflector 205 to refract the light source to output a simulated light source 220.

The power supply 207 is electrically connected to the xenon lamp 201 to supply the power required by the xenon lamp 201.

Compared to Embodiment 1, the light source system 200 of this embodiment further includes: an aperture 208. The aperture 208 is disposed between the first plane reflector 203 and the light homogenizer 204 to control the size of the light source passing through.

Compared to Embodiment 1, the light source system 200 of this embodiment further includes: a photo sensor 209. The photo sensor 209 is disposed on the path of the light source refracted by the optical lens 206 to sense the intensity and spectrum of the simulated light source 220.

The first driving device 210 is connected to the xenon lamp 201 to drive the xenon lamp 201, thereby changing the relative position between the xenon lamp 201 and the elliptical reflector 202. In this embodiment, the first driving device 210 drives the xenon lamp 201 to move up and down 10 mm along a z direction, but the present invention is not limited thereto. In another embodiment, the first driving device 210 is connected to the elliptical reflector 202 to drive the elliptical reflector 202 to move up and down along a z direction, thereby changing the relative position between the xenon lamp 201 and the elliptical reflector 202.

The moving distance of the xenon lamp 201 or the elliptical reflector 202 can be between +-10mm, and the distance between the xenon lamp 201 and the first plane reflector 203 can be changed, thereby changing the angle of the light source incident on the first plane reflector 203, thereby changing the spectrum of the light source after reflection. However, the present invention is not limited to this, and the spatial position between the elliptical reflector 202 and the first plane reflector 203 or the xenon lamp 201 and the first plane reflector 203 can also be adjusted (i.e., the relative position of the two in the x, y or z direction is adjusted) (this also adjusts the angle of the light source incident on the first plane reflector 203).

Compared to Embodiment 1, the light source system 200 of this embodiment further includes: a second driving device 211. The second driving device 211 is connected to the aperture 208 to control the size of the aperture 208.

The control device 212 is connected to the photoelectric sensor 209, the power supply 207, the first driving device 210 and the second driving device 211.

The control device 212 controls the power supply 207, the first driving device 210 and the second driving device 211 according to the properties of the analog light source 220 sensed by the photo sensor 209.

Specifically, the photosensor 209 can sense the intensity of the simulated light source 220, and the control device 212 can adjust the output power of the power supply 207 according to the intensity of the simulated light source 220 and adjust the size of the aperture 208 through the second driving device 211. When the intensity of the simulated light source 220 declines with the service life of the xenon lamp 201, the intensity of the simulated light source 220 can be maintained constant by increasing the output power of the power supply 207 or enlarging the aperture 208. In this embodiment, the output power of the power supply is between 20% and 100% of its maximum output power by the control of the control device, and the size of the aperture opening is between 0% and 100% of its maximum value by the control of the control device, but the present invention is not limited thereto.

In addition, the photoelectric sensor 209 can sense the spectrum of the analog light source 220, and the control device 212 can adjust the position of the xenon lamp 201 through the first driving device 210 according to the spectrum of the analog light source 220. When the spectrum of the analog light source 220 deviates from the spectrum of sunlight as the xenon lamp 201 ages, the position of the xenon lamp 201 can be adjusted in real time to keep the spectrum of the analog light source 220 constant.

In summary, the light source system 200 of this embodiment can monitor the properties of the simulated light source 220 in real time and make appropriate adjustments, so that the light source system 200 continuously and stably provides the simulated light source 220 with a spectrum matching the sunlight at the A+ level. The light source system 200 of this embodiment has a certain degree of stability. After the light source system 200 is adjusted to the optimal state, even if the photoelectric sensor 209 is removed, its optimal state can still be reasonably maintained and will not be out of control immediately.

In a preferred embodiment, at least one of the elliptical reflector, the first plane reflector, the light homogenizer and the second plane reflector may have a coating on its surface, and the coating may be selected from a group consisting of an aluminum reflective film, a silver reflective film, a gold reflective film, a multi-layer dielectric film and a special coating, and the thickness of the coating may be between 1nm and 150μm, but the present invention is not limited thereto. By setting the coating, the spectrum of the analog light source can be further adjusted.

In a preferred embodiment, it may further include: a third driving device, which is connected to the first plane reflector to control the angle between the first plane reflector and the incident light source, but the present invention is not limited thereto. By controlling the angle between the first plane reflector and the incident light source, the spectrum of the simulated light source can be further adjusted.

In a preferred embodiment, it may further include: a fourth driving device, which is connected to the light homogenizer to control the angle between the light homogenizer and the incident light source, but the present invention is not limited thereto. By controlling the angle between the light homogenizer and the incident light source, the spectrum of the simulated light source can be further adjusted.

In a preferred embodiment, it may further include: a fifth driving device, which is connected to the second plane reflector to control the angle between the second plane reflector and the incident light source, but the present invention is not limited thereto. By controlling the angle between the second plane reflector and the incident light source, the spectrum of the simulated light source can be further adjusted.

In a preferred embodiment, the curvature of the elliptical reflector can be between 1.4 and 2.25, but the present invention is not limited thereto. By adjusting the curvature of the elliptical reflector, the spectrum of the simulated light source can be further adjusted. The curvature of the elliptical reflector is defined as the distance from the opening of the elliptical reflector to the focal point, minus the diameter of the opening of the elliptical reflector.

In summary, the light source system of the present invention can continuously and stably provide a simulated light source with an intensity and spectrum similar to that of sunlight, and the spectral consistency between the simulated light source and sunlight can reach the A+ level.

The contents disclosed above are only the best feasible embodiments of the present invention, and do not limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made by using the contents of the description and drawings of the present invention are included in the scope of the patent application of the present invention.

100: Light source system

101: Xenon lamp

102: Elliptical reflector

104: Light homogenizer

106:Optical lens

107: Power supply

110: First driving device

112: Control device

120:Simulated light source

Claims (11)

A light source system includes: a xenon lamp; an elliptical reflector, which is arranged at a position adjacent to the xenon lamp to reflect the light source emitted by the xenon lamp; a homogenizer, which is arranged on the path of the light source reflected by the elliptical reflector; an optical lens, which is arranged on the path of the light source homogenized by the homogenizer to refract the light source to output a simulated light source; a power supply, which is connected to the xenon lamp Electrically connected; a first driving device, which is connected to the xenon lamp or the elliptical reflector to drive the xenon lamp or the elliptical reflector to change the relative position between the xenon lamp and the elliptical reflector; and a control device, which is connected to the power supply and the first driving device; wherein the control device controls the power supply and the first driving device according to the properties of the analog light source. The light source system as described in claim 1 further comprises: a first plane reflector, which is arranged on the path of the light source reflected by the elliptical reflector to reflect the light source reflected by the elliptical reflector to the homogenizer, and the homogenizer is arranged on the path of the light source reflected by the first plane reflector; a second plane reflector, which is arranged on the path of the light source homogenized by the homogenizer to reflect the light source homogenized by the homogenizer to the optical lens, and the optical lens is arranged on the path of the light source reflected by the second plane reflector; an aperture, which is arranged between the first plane reflector and the light homogenizer; a photoelectric sensor, which is arranged on the path of the light source refracted by the optical lens; and a second driving device, which is connected to the aperture to control the size of the aperture; wherein the control device controls the power supply, the first driving device and the second driving device according to the properties of the simulated light source sensed by the photoelectric sensor. A light source system as described in claim 2, wherein the surface of at least one of the elliptical reflector, the first plane reflector, the light homogenizer and the second plane reflector has a coating. A light source system as described in claim 3, wherein the coating is selected from the group consisting of an aluminum reflective film, a silver reflective film, a gold reflective film, a multi-layer dielectric film, and a special coating. A light source system as described in claim 3, wherein the thickness of the coating is between 1 nm and 150 μm. The light source system as described in claim 2 further includes: a third driving device connected to the first plane reflector to control the angle between the first plane reflector and the incident light source. The light source system as described in claim 2 further comprises: a fourth driving device connected to the light homogenizer to control the angle between the light homogenizer and the incident light source. The light source system as described in claim 2 further comprises: a fifth driving device connected to the second plane reflector to control the angle between the first plane reflector and the incident light source. A light source system as described in claim 1 or 2, wherein the curvature of the elliptical reflector is between 1.4 and 2.25. A light source system as described in claim 1 or 2, wherein the first driving device drives the xenon lamp or the elliptical reflector to move 10 mm up and down along a z direction. A light source system as described in claim 2, wherein the output power of the power supply is between 20% and 100% of its maximum output power under the control of the control device, and the size of the aperture opening is between 0% and 100% of its maximum value under the control of the control device.