CN115527434A

CN115527434A - Solar simulator capable of accurately simulating visible near-infrared wave band

Info

Publication number: CN115527434A
Application number: CN202211339181.1A
Authority: CN
Inventors: 彭月; 苏必达; 陈红; 王静; 王景峰; 孙腾
Original assignee: Beijing Institute of Environmental Features
Current assignee: Beijing Institute of Environmental Features
Priority date: 2022-10-28
Filing date: 2022-10-28
Publication date: 2022-12-27

Abstract

The invention relates to a solar simulator for accurately simulating visible near-infrared bands, which relates to the field of optical equipment and comprises xenon lamps, laser light sources, an upper reflector, side reflectors and an integrator, wherein a plurality of xenon lamps and one laser light source form a combined light source, coaxial light is emitted to the upper reflector, the upper reflector reflects the light to the side reflectors, the side reflectors reflect the light to the integrator, and a lens in the integrator is plated with a dielectric film so that the integrator emits the visible near-infrared bands of 0.4-1.7 mu m.

Description

Solar simulator capable of accurately simulating visible near-infrared wave band

Technical Field

The invention relates to the technical field of optical equipment, in particular to a solar simulator capable of accurately simulating visible and near-infrared bands.

Background

With the expansion of the field of human activities into space, the research on space targets becomes more and more important. Optical means have the advantage of being inherently thick in terms of spatial target detection. The method for acquiring the radiation and scattering characteristics of the space target mainly comprises a foundation data verification method and a space-based data verification method. The space-based photoelectric equipment realizes space-based data acquisition, such as Hubble and the like, and has the defects of highest cost and great difficulty in realization technology. The ground observation mainly adopts the observation station with large caliber established on the ground, and calibrates the detector by measuring the known fixed star, thereby realizing the star-like measurement of the space target and converting to obtain the brightness information of the target. The method has high cost and is easily influenced by the environment such as weather. In addition, since sunlight is irradiated on the earth in the daytime, various irradiation characteristics of the sunlight research target cannot be directly utilized due to the influence of the atmosphere and the rotation of the earth. Solar simulation technology needs to be researched to develop a large-caliber solar simulator, which approximately simulates the spectrum, radiation intensity, long-time stability and divergence angle of the sun.

The solar simulator generally adopts a xenon lamp as a light source, and the spectral distribution characteristic of the xenon lamp in a visible light wave band is basically equivalent to that of real solar irradiation. However, with the expansion of the application scenes of the solar simulator, the solar irradiation simulation requirements for the near-infrared band are increased, and the current requirements for the solar irradiation simulation generally require that the simulation band comprises a visible light band and a near-infrared band, namely that the irradiation simulation band of the solar simulator is required to be 0.4-1.7 μm. The common xenon lamp light source can only realize that the spectral mismatch error is less than or equal to +/-35 percent in the best state of the near infrared band, and the requirement of the spectral irradiance distribution of the B-level solar simulator can be met.

Therefore, in view of the above disadvantages, it is desirable to provide a solar simulator capable of accurately simulating the visible near infrared band.

Disclosure of Invention

Technical problem to be solved

The invention aims to solve the technical problem of realizing accurate solar irradiation simulation in a visible near-infrared band.

(II) technical scheme

In order to solve the technical problem, the invention provides a solar simulator for accurately simulating visible near-infrared bands, which comprises xenon lamps, laser light sources, an upper reflector, side reflectors and an integrator, wherein a plurality of xenon lamps and one laser light source form a combined light source, coaxial light is emitted to the upper reflector, the upper reflector reflects the light to the side reflectors, the side reflectors reflect the light to the integrator, and a lens in the integrator is plated with a dielectric film so that the integrator emits the visible near-infrared band with the wavelength of 0.4-1.7 mu m.

As a further explanation of the present invention, it is preferable that the number of the xenon lamps is four, four xenon lamps are located at four corners of the square, and the laser light source is installed at a central position of the four xenon lamps.

As a further explanation of the present invention, it is preferable that the xenon lamp is externally fitted with an ellipsoidal condenser lens so that the outgoing light is parallel light.

As a further description of the present invention, it is preferable that the laser light source is externally provided with a beam expanding optical system so that the size of the beam emitted from the laser light source is the same as the clear aperture of the integrator.

As a further description of the present invention, it is preferable that a field lens collimator and a superimposing lens are disposed in the integrator, the field lens collimator is located at the second focal plane of the ellipsoidal condenser, and the superimposing lens is located at the back row of the field lens collimator, so as to image and superimpose the field lens collimator at the same position of the illuminated surface.

As a further explanation of the present invention, it is preferable that a collimator is provided outside the integrator, and the focal position of the collimator coincides with the position of the integrator.

As a further explanation of the present invention, it is preferable that fans are disposed at the xenon lamp, the laser light source, the upper reflector and the side reflector for cooling.

(III) advantageous effects

The technical scheme of the invention has the following advantages:

the invention designs the xenon lamp and the broadband white light laser light source as coaxial radiation light sources, and plates the dielectric film on the optical integrator lens, thereby realizing the uniformity of visible near-infrared wave bands, and the spectral mismatch difference is less than or equal to +/-20 percent, and achieving the requirement of the spectral irradiance distribution of the A-level solar simulator.

Drawings

FIG. 1 is an assembly effect diagram of the present invention;

fig. 2 is a light path diagram of the present invention.

In the figure: 1. a xenon lamp; 11. an ellipsoidal condenser; 2. a laser light source; 3. an upper mirror; 4. a side mirror; 5. an integrator; 6. a fan.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

The utility model provides a solar simulator of accurate simulation of visible near-infrared band, because of concrete realization receives the place overall arrangement restriction, then designs through catadioptric formula light path as solar simulator total light path, specifically does: combine figure 1, 2, including xenon lamp 1, laser source 2, go up speculum 3, side reflector 4 and integrator 5, four xenon lamps 1 constitute the combination light source with a laser source 2, and the combination light source all sets up in the box middle part, goes up speculum 3 and links firmly at the box top, and side reflector 4 links firmly box one side between combination light source and last speculum 3, goes up speculum 3 and side reflector 4 and is the level crossing and the slope arranges for the reflection light path. The surfaces of the upper reflector 3 and the side reflector 4 can also be coated with films to filter light with different wave bands, so that the light output by the two reflections of the upper reflector 3 and the side reflector 4 meets the requirement. The integrator 5 is arranged at the other side of the box body, and a collimating mirror is further arranged outside the box body and used for converting the diffused uniform light into approximately parallel light so as to simulate the parallel light emitted by the sun.

With reference to fig. 1 and 2, the combined light source emits coaxial light to the upper reflector 3, the upper reflector 3 reflects the light to the side reflector 4, the side reflector 4 reflects the light to the integrator 5, a collimator lens is arranged outside the integrator 5, the focal point of the collimator lens coincides with the integrator 5, the collimator lens changes the divergent uniform light beam emitted by the integrator 5 into nearly parallel light, and then uniform irradiation can be formed on an irradiation surface through reflection. The xenon lamp 1, the laser light source 2, the upper reflector 3 and the side reflector 4 are respectively provided with the fan 6 for cooling, so that the probability of burning loss of each part due to heat generated by the xenon lamp 1 is reduced, and the service life of the simulator is prolonged.

With reference to fig. 1 and 2, the four xenon lamps 1 are located at four corners of a square, the laser light source 2 is installed at the central positions of the four xenon lamps 1, and the laser light source 2 is a broadband white light laser light source. Considering the high-precision requirements of the solar simulator on uniformity and spectral distribution, the four xenon lamps 1 and the broadband white light laser light source 2 need to be designed as coaxial radiation light sources, and irradiation areas need to be overlapped to form uniform solar irradiation simulation with small spectral mismatch error on an irradiation surface, so that the laser light source 2 is arranged at the central positions of the four xenon lamps 1. And the light power required by the solar simulator is ensured by adopting the combination of multiple light sources.

With reference to fig. 1 and 2, the ellipsoidal condenser 11 is sleeved outside the xenon lamp 1 to make the emergent light be parallel light, and the energy utilization rate of the system can be improved. The beam expanding optical system is arranged outside the laser light source 2, the beam expanding optical system is mainly formed by single-sided concave lenses and convex lenses in interval distribution, the range of light beams emitted by the laser light source 2 close to a point light source is increased through multiple refractions, the size of the light beams emitted by the laser light source 2 is the same as the light-passing caliber of the integrator 5 by selecting specific lenses, and the light emitted by the xenon lamp 1 and the light emitted by the broadband white light laser light source can be completely irradiated to the collimating mirror through the integrator and then reflected to an irradiation area by the collimating mirror in combination with the light condensing effect of the ellipsoid condensing mirror 11 on the xenon lamp 1.

And a field lens collimating lens and a superposed lens are arranged in the integrator 5, the field lens collimating lens is positioned at the second focal plane of the ellipsoidal condenser 11, plays a role of a field lens, and images the exit pupil of the condenser to the corresponding superposed lens. The superposition lens is positioned at the rear row of the field lens collimating lens so as to image the field lens collimating lens and overlap the field lens collimating lens to the same position of the illuminated surface. Because the contextual collimator symmetrically divides the irradiance distribution on the secondary focal plane of the ellipsoidal condenser 11, the uniformity across each lens is significantly better than across the entire secondary focal plane. When the images of all the lenses are superimposed, the uniformity errors can be compensated for each other, and therefore the superimposed lenses are arranged at the positions of the superimposed image planes, so that the light uniformity is the best. The field lens collimating lens and the superposed lens are both plated with dielectric films to attenuate the peak spectral band of energy in the wave band of 0.8-1.7 μm, so that the uniformity of the visible near-infrared wave band (0.4-1.7 μm) is finally realized, the error of the spectral mismatch rate is less than or equal to +/-20%, the requirement of the spectral irradiance distribution of the A-level solar simulator is met, and the uniform solar irradiation simulation of accurate spectrum simulation is realized.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A solar simulator capable of accurately simulating visible near-infrared bands is characterized in that: the xenon lamp integrating device comprises xenon lamps (1), laser light sources (2), an upper reflector (3), side reflectors (4) and an integrator (5), wherein a plurality of xenon lamps (1) and one laser light source (2) form a combined light source, the combined light source emits light with the same axis to the upper reflector (3), the upper reflector (3) reflects the light to the side reflectors (4), the side reflectors (4) reflect the light to the integrator (5), and a dielectric film is plated on an lens in the integrator (5) so that the integrator (5) emits a visible near-infrared waveband of 0.4-1.7 mu m.

2. The solar simulator for precise simulation of the visible near infrared band according to claim 1, wherein: the number of the xenon lamps (1) is four, the four xenon lamps (1) are located at four corners of a square, and the laser light source is installed at the center positions of the four xenon lamps (1).

3. The solar simulator for precise simulation of visible and near infrared bands according to claim 2, wherein: an ellipsoidal condenser lens (11) is sleeved outside the xenon lamp (1) to enable emergent rays to be parallel light.

4. The solar simulator for precise simulation of the visible near infrared band according to claim 3, wherein: and a beam expanding optical system is arranged outside the laser source (2) so that the size of a light beam emitted by the laser source (2) is the same as the light transmission caliber of the integrator (5).

5. The solar simulator for precise simulation of the visible near infrared band according to claim 4, wherein: a field lens collimating lens and a superposition lens are arranged in the integrator (5), the field lens collimating lens is positioned at the second focal plane of the ellipsoid condenser (11), and the superposition lens is positioned at the rear row of the field lens collimating lens so as to image the field lens collimating lens and overlap the field lens to the same position of the irradiated surface.

6. The solar simulator for precise simulation of visible and near infrared bands of claim 5, wherein: a collimating mirror is arranged outside the integrator (5), and the position of the focus of the collimating mirror is coincided with the position of the integrator (5).

7. The solar simulator for precise simulation of visible and near infrared bands of claim 6, wherein: the xenon lamp (1), the laser light source (2), the upper reflector (3) and the side reflector (4) are all provided with a fan (6) for cooling.