Intensity-adjustable wide-spectrum light source device and adjustment method

Abstract

The present application relates to a kind of intensity adjustable wide spectrum light source device, including solar tracking system, secondary mirror array system, sample support.Solar tracking system receives and reflects sunlight to secondary mirror array system, secondary mirror array system is reflected to secondary reflection, secondary reflection light is focused to the irradiation experimental sample fixed by sample support on it.This application also relates to a kind of light intensity time-varying adjustment method, including the steps of sun tracking, light intensity adjustment, irradiation experiment.The present application can realize automatic sun tracking, ensure the accurate positioning of the irradiation area of the light spot formed by secondary reflection light, and the positioning accuracy is less than 1mrad.The intensity of secondary reflection light irradiated to sample can be adjusted, the irradiation light spot is uniform, the power consumption is small, the maintenance is simple, the use efficiency is high, the floor area is smaller, and the use requirements in laboratory environment are met.

Description

Technical Field

[0001] This invention belongs to the technical field of optical radiation experimental devices, specifically relating to an intensity-adjustable broadband light source device and its adjustment method. Background Technology

[0002] Since light has been recognized as a usable resource, it has seen significant development in fields such as national defense, people's livelihood, and energy. Therefore, research in the field of light radiation has become a promising research direction. While strong explosions are a primary means of generating high-intensity light radiation, practical considerations such as experimental safety, cost, and sustainability must be taken into account. Therefore, using strong explosions as the primary means of generating light radiation in laboratory settings is not the optimal choice.

[0003] Existing research indicates that the spectral composition of light radiation produced by a strong explosion is essentially similar to that of sunlight, and can be considered a broadband light source. Sunlight naturally solves the problem of uniformity in light spot irradiance; therefore, using sunlight as a source for simulating light radiation is a novel research approach. In conducting research on light radiation simulation technology, a light radiation simulation source is indispensable as a foundational light source. Existing mature light radiation simulation source technologies include quartz lamp arrays, solar furnaces, and chemical reaction heat sources. These technologies have been used in numerous basic and applied studies in materials science, chemistry, chemical engineering, aerospace, and energy utilization. However, existing light radiation simulation technologies cannot simultaneously achieve uniformity of light spot, accurate spot positioning, and time-varying adjustable light intensity. Therefore, these issues urgently need to be addressed in the research of light radiation simulation technology.

[0004] This invention addresses the shortcomings of existing optical radiation simulation technologies by designing and inventing a broadband light source device with uniform light spot, high focusing and positioning accuracy (less than 1 mrad), and adjustable light intensity over time. It also proposes a time-varying light intensity adjustment method, solving the existing technical problems of optical radiation simulation sources. Furthermore, this invention features high modularity, low power consumption, and easy calibration and amplification, meeting the needs of different application scenarios and showing great application prospects. Summary of the Invention

[0005] To overcome the shortcomings of existing optical radiation simulation sources, such as uneven light spot, non-time-varying light intensity, and low positioning accuracy, this invention proposes a broadband light source device and adjustment method with adjustable intensity.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] An intensity-adjustable broadband light source device mainly includes a solar tracking system, a secondary reflector array system, and a sample holder.

[0008] Using sunlight as the incident light source, the solar tracking system receives and reflects sunlight to the secondary reflector array system; the secondary reflector array system performs secondary reflection of the sunlight reflected by the solar tracking system, and finally reflects the sunlight onto the irradiated experimental sample fixed by the sample holder.

[0009] The sample holder is fixed to the secondary reflector array system.

[0010] The aforementioned intensity-adjustable broadband light source device includes a solar tracking system comprising a heliostat, a mirror support, and a tracking system base connected in sequence.

[0011] The tracking system base supports the solar tracking system, the mirror bracket is mounted on the tracking system base, and the heliostat is mounted on the mirror bracket. The heliostat reflects sunlight.

[0012] The aforementioned intensity-adjustable broadband light source device has a heliostat mirror with a surface area of ​​1.5m × 1.5m, which is a recommended but not limited size. The heliostat mirror is made of silver-plated mirror material, which is a recommended but not limited material.

[0013] The aforementioned intensity-adjustable broadband light source device also includes a pitch turntable on the mirror support. The pitch turntable is located on both sides of the mirror support and drives the pitch movement of the heliostat mirror to realize the pitch rotation of the heliostat mirror during the heliostating and tracking process of the solar tracking system.

[0014] The tracking system base also includes a horizontal turntable, which is located below the mirror support and drives the horizontal movement of the mirror support to realize the horizontal rotation of the sun-fixing reflector during the sun-fixing and sun-tracking processes of the solar tracking system.

[0015] The pitch and horizontal turntables work together to drive the pitch and horizontal movement of the heliostat mirror according to the initial geographical location and time identified by the solar tracking system and the local solar trajectory preset by the system. This enables the mirror to be oriented towards the sun and accurately track the sun according to its trajectory, thus achieving sun tracking.

[0016] The aforementioned intensity-adjustable broadband light source device includes a secondary reflector array system comprising a secondary reflector array, a mirror frame, and a reflector array base.

[0017] The base of the reflector array supports the secondary reflector array system. The mirror frame is mounted on the base of the reflector array, and the secondary reflector array is mounted on the mirror frame.

[0018] The secondary reflector array comprises several secondary reflectors arranged according to a certain pattern. The secondary reflectors are located in the same plane and are symmetrically distributed to form an array structure.

[0019] The geometric center of the heliostat mirror is aligned with the geometric center of the secondary mirror array, meaning that the geometric center of the heliostat mirror and the geometric center of the secondary mirror array are located on the same horizontal line.

[0020] The secondary reflector array reflects the reflected light from the heliostat of the solar tracking system a second time, accurately reflecting the sunlight to a fixed position.

[0021] The aforementioned intensity-adjustable broadband light source device uses silver-plated mirrors as the secondary reflectors. Each secondary reflector provides an illuminance of 1 solar constant. The secondary reflector array adopts a symmetrical structure design, with 11 secondary reflectors on each half-axis and 94 secondary reflectors recommended for each quadrant, for a total of 420 secondary reflectors.

[0022] The aforementioned intensity-adjustable broadband light source device further includes a secondary mirror array control system in the secondary mirror array system.

[0023] The secondary reflector array control system is equipped with a reflector array control unit. The control unit can adjust the number of secondary reflectors at the position of reflecting sunlight by means of a time-varying signal input from the control system, thereby adjusting the light intensity reflected to the sample to change over time and achieving time-varying adjustment of light intensity.

[0024] The aforementioned intensity-adjustable broadband light source device includes a sample holder comprising a rod and a sample clamp.

[0025] The rod is mounted on the mirror frame of the secondary reflector array system, the sample holder is fixed on the rod, and the experimental sample is fixed on the sample holder.

[0026] The center of the experimental sample, the center of the secondary mirror array system, and the center of the heliostat of the solar tracking system are on the same axis, i.e., the axes are aligned. The secondary reflected light formed by the secondary mirror array is focused onto the irradiation area of ​​the experimental sample.

[0027] A method for time-varying light intensity adjustment, the specific steps of which are as follows:

[0028] Step 1, Fixed-day tracking

[0029] First, activate the solar tracking system, input and confirm the initial position and time information. Equipped with a position recognition function, the system automatically controls the elevation and azimuth rotations based on the current position and the preset local solar trajectory to achieve solar orientation. It then precisely adjusts the attitude of the heliostat mirrors in real time to achieve sun-tracking, reflecting the incident sunlight onto the secondary reflector array system. The center of the secondary reflector array system and the center of the heliostat mirrors in the solar tracking system are always strictly aligned.

[0030] Secondly, sunlight reflected from the solar tracking system to the secondary reflector array system is accurately reflected onto the experimental sample area after being reflected by a certain number of secondary reflectors positioned at preset sunlight-reflecting locations. The light intensity at the sample is maximum when all secondary reflectors are in their sunlight-reflecting positions, and minimum (0) when none of the secondary reflectors are in their sunlight-reflecting positions.

[0031] Step 2, Light Intensity Modulation

[0032] Designed according to experimental parameters, the broadband light source device of this invention can provide both fixed power irradiance and time-varying power irradiance.

[0033] If a fixed power of irradiation intensity is required, the target power signal is input into the control terminal of the secondary reflector array system. The system will automatically adjust a certain number of secondary reflectors required to provide the irradiation power so that they are positioned to reflect sunlight, accurately reflecting sunlight to the sample irradiation area.

[0034] If the power of the irradiated area needs to be time-varying and adjustable, the target time-varying power signal is input into the control terminal of the secondary reflector array system. The system will adjust the number of secondary reflectors at the position of reflecting sunlight required for the corresponding power according to the input signal over time (i.e., the number of secondary reflectors that effectively participate in reflecting sunlight), so that the light intensity reflected to the sample irradiated area can be time-varying and adjustable.

[0035] Step 3, Spot Uniformity

[0036] After sunlight travels through the atmosphere to the ground, it can be considered as uniform light radiation. The light source of this device is sunlight, which naturally solves the problem of uniform light spot.

[0037] Step 4, Experimental Testing

[0038] Place the irradiation test sample in the sample holder, set up the required testing equipment, and begin the irradiation experiment.

[0039] In the aforementioned time-varying light intensity adjustment method, during step 1 (sun tracking), the center of the heliostat is located at the intersection of the axes of symmetry of the elevation turntable mechanism and the azimuth turntable mechanism. That is, the center of the heliostat coincides with the intersection of the axes of symmetry of the elevation and azimuth turntable mechanisms. This special structural design ensures that the positioning accuracy of the reflected light to the secondary mirror array system is less than 1 mrad.

[0040] The beneficial effects of this invention are:

[0041] An intensity-adjustable broadband light source device is disclosed. The solar tracking system has a position information recognition function and can achieve accurate and automatic sun tracking after startup. The solar tracking system achieves horizontal and vertical rotation through its azimuth and elevation turntables, accurately reflecting incident sunlight to the secondary reflector array system. Through special mechanical design and calculation, the heliostat is installed at the intersection of the geometric rotation axes of the azimuth and elevation turntable mechanisms of the solar tracking system, ensuring that the center of the heliostat coincides with the intersection axis when the heliostat is installed. During the sun tracking process, the center of the heliostat and the center of the secondary reflector array are strictly aligned, achieving accurate positioning of the irradiation area of ​​the light spot formed by the secondary reflected light, with a positioning accuracy of less than 1 mrad.

[0042] An intensity-adjustable broadband light source device comprises a secondary reflector array system consisting of small reflectors arranged in a specific position. Each small reflector has its working position determined during design and installation. When each small reflector is in its designated position, it accurately directs sunlight reflected from the solar tracking system to the irradiation area of ​​the experimental sample on the sample holder. Except for its preset working position, each reflector will not reflect sunlight to the sample holder in any other position. The secondary reflector array system has an external controller interface, which can control the position of each small reflector through a time-varying input signal. This allows for time-varying adjustment of the light spot by controlling the number of small reflectors reflecting sunlight to the sample holder according to the input time-varying signal. Because sunlight naturally exhibits uniform irradiation, this system simultaneously solves the problem of light spot uniformity, meeting the light source requirements of irradiation experiments.

[0043] An adjustable intensity broadband light source device is proposed. It adopts a modular design, which makes it easy to maintain. Its functions can be expanded or components can be replaced as needed to improve its efficiency. At the same time, it has a small footprint, which meets the requirements of laboratory environment. The device consumes little power by using sunlight throughout its operation. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the light source device of the present invention;

[0045] Figure 2 This is a schematic diagram of the light source device structure of the present invention;

[0046] Figure 3 This is a schematic diagram of a solar tracking system.

[0047] Figure 4 This is a schematic diagram of the combination of the mirror array and the sample holder.

[0048] In the figure: 1. Solar tracking system; 2. Secondary reflector array system; 3. Sample holder; 12. Heliostat; 13. Reflector holder; 14. Pitch stage; 15. Horizontal stage; 16. Tracking system base; 21. Secondary reflector array; 22. Mirror frame; 23. Reflector array base; 31. Rod holder; 32. Sample holder. Detailed Implementation

[0049] Example 1

[0050] An intensity-adjustable broadband light source device includes a solar tracking system 1, a secondary reflector array system 2, and a sample holder 3, such as... Figure 1 , Figure 2 As shown.

[0051] The solar tracking system 1 includes a heliostat 12, a reflector bracket 13, and a tracking system base 16. All of these components are mounted on the tracking system base 16. Figure 1 As shown. The reflector bracket 13 also includes a pitch turntable 14, and the tracking system base 16 also includes a horizontal turntable 15, as shown. Figure 2 , Figure 3 As shown.

[0052] The secondary mirror array system 2 includes a secondary mirror array 21, a mirror mount 22, and a mirror array base 23, all of which are mounted on the mirror array base 23. Figure 2 , Figure 4 As shown.

[0053] The sample holder 3 includes a rod 31 and a sample holder 32. The rod 31 and the sample holder 32 are fixed to the mirror array frame 22, as shown below. Figure 2 , Figure 4 As shown.

[0054] The working principle of this light source device is as follows:

[0055] The solar tracking system 1 is based on a tracking system base 16. A horizontal turntable 15 is mounted on the base 16, and a horizontal drive mechanism is installed within the turntable 15 to control the horizontal rotation of the heliostat 12. A reflector bracket 13 supports the heliostat 12; that is, the heliostat 12 is mounted on the reflector bracket 13. Pitch drive mechanisms are installed on both sides of the reflector bracket 13 to control the pitch movement of the heliostat 12. The center of the heliostat 12's mirror surface must be perfectly aligned with the intersection of the central axes of the horizontal and pitch drive mechanisms to ensure the positioning accuracy of the reflected light during sunlight reflection. The recommended size for the heliostat 12 is 1.5m × 1.5m, but it is not limited to this size. The recommended material for the heliostat 12 is a silver-plated mirror, but it is not limited to this material.

[0056] The secondary reflector array system 2 is based on the reflector array base 23, on which a mirror frame 22 is mounted. The secondary reflectors form a secondary reflector array 21, which adopts a symmetrical structure design. It is recommended that there be 11 secondary reflectors 21 on each half-axis and 94 secondary reflectors 21 in each quadrant, for a total of 420 secondary reflectors. These are recommended numbers, but not limited to them. The recommended material for the secondary reflectors is a silver-plated mirror, but it is not limited to this material. Each secondary reflector has two orientations: each reflector has a preset working position and can be popped up to the preset position as needed. When each small reflector is in this working position, it reflects sunlight and focuses it onto the sample holder. It can also be switched to other positions and not reflect sunlight. The secondary reflector array system 2 has an external secondary reflection control interface. By inputting a time-varying signal, the number of working secondary reflectors in the secondary reflector array system 2 can be adjusted, thereby changing the intensity of the reflected sunlight reaching the sample over time, achieving time-varying adjustable light intensity.

[0057] During operation, the heliostat 12 of the solar tracking system 1 and the secondary mirror array system 2 must ensure that the geometric center of the mirror surface of the heliostat 12 of the solar tracking system 1 is aligned with the geometric center of the secondary mirror array to ensure the positioning accuracy of the focusing area of ​​the secondary reflected light spot.

[0058] The time-varying light intensity adjustment method includes the following steps:

[0059] Step 1, Date tracking:

[0060] First, activate the solar tracking system, input and confirm the initial position and time information. Equipped with a position recognition function, the system automatically controls the elevation and azimuth rotations to orient itself towards the sun based on the current position and the preset local solar trajectory. It then precisely adjusts the attitude of the heliostat to achieve sun-tracking, reflecting the incident sunlight onto the secondary reflector array system. The center of the secondary reflector array system and the center of the heliostat in the solar tracking system are always strictly aligned.

[0061] Secondly, sunlight reflected from the solar tracking system to the secondary reflector array system is accurately reflected onto the experimental sample area after being reflected by a certain number of secondary reflectors positioned at the sunlight reflection location. The light intensity at the sample is maximum when all secondary reflectors are in the sunlight reflection location, and minimum (0) when all secondary reflectors are not in the sunlight reflection location.

[0062] Step 2, Light Intensity Adjustment:

[0063] Designed according to experimental parameters, the broadband light source device of this invention can provide both fixed power irradiance and time-varying power irradiance.

[0064] If a fixed power of irradiation intensity is required, the target power signal is input into the control terminal of the secondary reflector array system. The system will automatically adjust a certain number of secondary reflectors required to provide the irradiation power so that they are positioned to reflect sunlight, accurately reflecting sunlight to the sample irradiation area.

[0065] If the power of the irradiated area needs to be time-varying and adjustable, the target time-varying power signal is input into the control terminal of the secondary reflector array system. The system will adjust the number of secondary reflectors at the position of reflecting sunlight required for the corresponding power according to the input signal over time (i.e., the number of secondary reflectors that effectively participate in reflecting sunlight), so that the light intensity reflected to the sample irradiated area can be time-varying and adjustable.

[0066] Step 3, Spot Uniformity:

[0067] After sunlight travels through the atmosphere to the ground, it can be considered as uniform irradiance. The sunlight reflected back to the system by the solar tracking system naturally solves the problem of uniform light spot.

[0068] Step 4, Experimental Testing:

[0069] Place the irradiation test sample in the sample holder, set up the required testing equipment, and begin the irradiation experiment.

Claims

1. A broadband light source device with adjustable intensity, characterized in that, Includes a solar tracking system (1), a secondary reflector array system (2), and a sample holder (3); Using sunlight as the incident light source, the solar tracking system (1) receives and reflects sunlight to the secondary reflector array system (2); the secondary reflector array system (2) performs secondary reflection on the sunlight reflected by the solar tracking system (1), and the secondary reflected light is reflected onto the irradiated experimental sample fixed by the sample holder (3); The sample holder (3) is fixed to the secondary reflector array system (2); The solar tracking system (1) includes a heliostat (12), a mirror bracket (13), and a tracking system base (16) connected in sequence. The tracking system base (16) supports the solar tracking system (1), the mirror bracket (13) is mounted on the tracking system base (16), and the heliostat (12) is mounted on the mirror bracket (13); the heliostat (12) reflects sunlight; The secondary mirror array system (2) includes a secondary mirror array (21), a mirror frame (22), and a mirror array base (23). The base (23) of the reflector array supports the secondary reflector array system (2), the mirror frame (22) is mounted on the base (23), and the secondary reflector array (21) is mounted on the mirror frame (22). The secondary reflector array (21) includes several secondary reflectors arranged according to a certain pattern. The secondary reflectors are located in the same plane and are symmetrically distributed to form an array structure. The geometric center of the heliostat (12) mirror is aligned with the geometric center of the secondary mirror array (21), that is, the geometric center of the heliostat (12) mirror and the geometric center of the secondary mirror array (21) are located on the same horizontal line. The secondary reflector array (21) reflects the reflected light from the heliostat (12) of the solar tracking system (1), forming secondary reflected light and accurately reflecting the sunlight to a fixed position; The secondary reflector array (21) adopts a symmetrical structure; The secondary mirror array system (2) also includes a secondary mirror array control system; The secondary reflector array control system is equipped with a reflector array control unit. Through the time-varying signal input to the system, the control unit adjusts the number of secondary reflectors participating in the reflection of sunlight at different times, thereby realizing the time-varying adjustment of the light intensity reflected to the sample.

2. The intensity-adjustable broadband light source device according to claim 1, characterized in that, The heliostat (12) has a mirror surface of 1.5m × 1.5m; the heliostat (12) is made of silver-plated mirror surface.

3. The intensity-adjustable broadband light source device according to claim 1, characterized in that, The mirror support (13) also includes a pitch turntable (14), which is located at both ends of the mirror support (13) to drive the pitch movement of the heliostat (12) and drive the pitch rotation of the heliostat during the heliostating and tracking process of the solar tracking system. The tracking system base (16) also includes a horizontal turntable (15), which is located below the mirror support (13) and drives the horizontal movement of the mirror support (13) to drive the horizontal rotation of the sun-tracking system's sun-fixing reflector during the sun-tracking process. The pitch turntable (14) and the horizontal turntable (15) work together to control and drive the pitch and horizontal movement of the heliostat (12) according to the geographical location and time information input and identified by the solar tracking system, combined with the local solar trajectory information preset by the system, thus realizing the heliostat tracking.

4. The intensity-adjustable broadband light source device according to claim 1, characterized in that, The secondary reflector is made of silver-plated mirror; each secondary reflector provides illuminance of 1 solar constant; there are 11 secondary reflectors on each half-axis, and 94 secondary reflectors are recommended for each quadrant, for a total of 420 secondary reflectors.

5. The intensity-adjustable broadband light source device according to claim 3, characterized in that, The sample holder (3) includes a rod frame (31) and a sample holder (32); The rod (31) is mounted on the mirror frame (22) of the secondary reflector array system (2), the sample holder (32) is fixed on the rod (31), and the experimental sample is fixed on the sample holder (32). The center of the experimental sample, the center of the secondary mirror array (21) of the secondary mirror array system (2), and the center of the heliostat (12) of the solar tracking system (1) are on the same axis, i.e., the axis is aligned. The secondary reflected light formed by the secondary mirror array is focused onto the irradiation area of ​​the experimental sample.

6. A method for adjusting light intensity over time, utilizing a broadband light source device with adjustable intensity as described in any one of claims 1 to 5, characterized in that, The specific steps are as follows: Step 1, Date tracking: First, turn on the solar tracking system, input and confirm the initial position and time information. The solar tracking system is equipped with a position recognition function. The system will automatically control the pitch and azimuth rotation to achieve solar orientation based on the current position information and the preset local solar trajectory. It will also adjust the attitude of the heliostat in real time to achieve solar tracking and reflect the incident sunlight to the secondary reflector array system. The center of the secondary reflector array system and the center of the heliostat in the solar tracking system will always be strictly aligned. The center of the heliostat (12) is located at the intersection of the axis of symmetry of the pitch turntable mechanism and the axis of symmetry of the azimuth turntable mechanism; that is, the center of the heliostat (12) coincides with the intersection of the axis of symmetry of the pitch turntable mechanism and the axis of symmetry of the azimuth turntable mechanism; this special structural design ensures that the positioning accuracy of the reflected light reflected to the secondary reflector array system (2) is less than 1 mrad. Secondly, each secondary mirror in the secondary mirror array (21) has two selectable positions: one is the working position, which is preset during installation, and each mirror can accurately reflect sunlight to the sample irradiation area when in this position; the other is the non-working position, where each secondary mirror will not reflect sunlight to the sample irradiation area when in this position. The sunlight reflected by the solar tracking system (1) to the secondary reflector array system (2) is reflected by a certain number of secondary reflectors located at preset sunlight reflection positions, and then accurately reflected to the experimental sample area. Therefore, the light intensity at the sample is the maximum when all secondary reflectors are at the sunlight reflection positions, and the light intensity at the sample is the minimum of 0 when all secondary reflectors are not at the sunlight reflection positions. Step 2, Light Intensity Adjustment: Designed according to experimental parameters, the broadband light source device can provide both fixed power irradiance and time-varying power irradiance. If a fixed power of irradiation intensity is required, the target power signal is input into the control terminal of the secondary reflector array system (2), and the system will automatically adjust a certain number of secondary reflectors required to provide irradiation power so that they are in the position to reflect sunlight, and accurately reflect sunlight to the sample irradiation area. If the power of the irradiation area needs to be time-varying and adjustable, the target time-varying power signal is input into the control terminal of the secondary reflector array system (2). The system will adjust the number of secondary reflectors at the position of reflecting sunlight required for the corresponding power according to the input signal and the time change. The number of secondary reflectors is the number of secondary reflectors that effectively participate in reflecting sunlight, so that the light intensity reflected to the sample irradiation area can be time-varying and adjustable. Step 3, Spot Uniformity: Sunlight reaches the ground through the atmosphere and is considered as uniform irradiance. The sunlight reflected to the system by the solar tracking system (1) naturally solves the problem of uniformity of light spot and achieves uniform light spot irradiance. Step 4, Experimental Testing: Place the irradiation test sample in the sample holder (32), set up the test equipment required for the experiment, and start the irradiation experiment.

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