CN103791275B - A kind of extensive parallel optical simulator - Google Patents

Abstract

The invention discloses a kind of extensive parallel optical simulator, the present invention utilizes LED chip to have the features such as light efficiency is high, caloric value is little, response is fast, the life-span is long, use single led chip for light source, each LED adopts aspheric surface collector lens as light collecting device, Fresnel lens is as collimating element, the combination of three just can complete optically focused, is then being modified to the function of directional light.The present invention forms directional light light illuminating unit module by multiple LED illumination unit of different spectral coverage, and then form whole extensive parallel optical simulator, compare xenon lamp or halogen light source, LED chip is used to greatly reduce the requirement of power consumption, heat radiation, thus reduce construction weight, make extensive parallel optical analog become possibility, solve the problem in power, structure, optical design etc. that traditional solar simulator runs into when extensive parallel optical analog.

Description

A kind of extensive parallel optical simulator

Technical field

The present invention relates to a kind of directional light simulator, particularly relate to a kind of extensive parallel optical simulator, belong to spacecraft ground physical test technical field.

Background technology

Along with the development of China's aerospace industry, survey of deep space proposes new requirement to ground experiment checking work.Especially deep space Detection Techniques ground experiment checking in place, is all different from traditional satellite, airship project from test method, testing equipment.Especially active demand is proposed to large-area directional light simulation.Tradition solar simulator manufacturing technology, normally with xenon lamp, Halogen lamp LED for light source, under illuminating area is generally square at 1 meter, deep space detection class in place pilot project cannot be adapted to the demand of illuminating area.Because the efficiency of these two kinds of light sources is not high, very high request is proposed to the optical design of directional light analog machine, structural design and heat dissipation design, is therefore difficult to the demand meeting the simulation of large-area directional light.

Summary of the invention

Technical problem to be solved by this invention: overcome the deficiencies in the prior art, a kind of extensive parallel optical simulator is provided, this simulator structure is simple, be easy to realize, be that light source carries out extensive parallel optical analog with LED component, meet the test demand in the depth of parallelism, spectral region, irradiation intensity, the uniformity, stability etc.

Technical solution of the present invention is: a kind of extensive parallel optical simulator, be spliced by M foursquare directional light light illuminating unit module, each directional light light illuminating unit module is rearranged by N number of 600nm ~ 700nm red-light LED light illuminating unit and N number of 959nm ~ 989nm infrared light LED illumination unit interval, each 600nm ~ 700nm red-light LED light illuminating unit or each 959nm ~ 989nm red-light LED light illuminating unit include single led chip, light collecting device and collimating element, light collecting device and collimating element combination are collected and parallelization single led chip emitted light.

The light collecting device of described single led chip adopts non-spherical lens, and aspherical equation is:

$z=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-(1+k)c^2{r}^2}}+r^2+r^4+r^6+r^8$

r=11.4,c=-1,r ²=-2.144529e ^-10,r ⁴=-0.000482,r ⁶=-1.2e ^-5,r ⁸=-7.967429e ^-8

Z represents optical axis direction height; R represents vertical optical axis direction height; K represents asphericity coefficient; C represents vertex curvature.

The collimating element of described single led chip is Fresnel lens.

The number of described M is for being no less than 49, and the number of N is for being no less than 10.

The directional light light illuminating unit module of described 1m × 1m size is made up of 14 × 14 LED illumination unit.

The present invention's beneficial effect is compared with prior art: it is high that the present invention utilizes LED chip to have light efficiency, caloric value is little, response is fast, the features such as the life-span is long, use single led device for light source, each LED adopts aspheric surface collector lens as the light collecting device of LED, Fresnel lens is as the collimating element of LED, the combination of three just can complete optically focused, then the function of directional light is being modified to, LED illumination unit is formed by the single led of different spectral coverage, and then form whole extensive parallel optical simulator, compare xenon lamp or halogen light source, LED chip is used to greatly reduce power consumption, the requirement of heat radiation, thus reduce construction weight, extensive parallel optical analog is made to become possibility, solve the power that traditional solar simulator runs into when extensive parallel optical analog, structure, the problem of the aspects such as optical design, apply this technology, extensive parallel optical analog equipment can be made to measure for concrete physical simulation test, meet the physical simulation test having extensive parallel optical analog.

Accompanying drawing explanation

Fig. 1 is the shape assumption diagram of non-spherical lens;

Fig. 2 is the shape assumption diagram of Fresnel lens;

Fig. 3 is single led parallel radiation schematic diagram;

Fig. 4 is the composition structure chart of each light illuminating unit module;

Fig. 5 is the structure chart of extensive parallel optical simulator;

Fig. 6 is contour structures schematic diagram of the present invention;

Fig. 7 is the actual irradiation design sketch of extensive parallel optical analog system.

Detailed description of the invention

Realization approach of the present invention is:

(1) suitable LED chip is selected.LED is the light source of narrow spectrum, and the wavelength major part of the light that LED chip directly sends changes in the scope of tens nm.According to this attribute, according to the demand of spacecraft physical l-G simulation test, determine the spectral coverage of target optical spectrum, the LED chip selecting appropriate light spectral limit and power combines, the illumination that just can meet with a response in spectral region.Meanwhile, the power of selected LED is determined according to required intensity of illumination.

(2) light collecting device, the collimating element of single led light illuminating unit is designed.LED light source is a kind of approximate Lambertian source, namely the cosine distribution that Light distribation is is zero angle with the axis perpendicular to light-emitting area, if directly LED is applied to illumination, meeting forms a uneven circular light spot on plane of illumination, center is the brightest, and can be able to decay along with the increase brightness of radius, in order to overcome this shortcoming, need to carry out secondary optical design, need the light to each LED chip sends fully collect and collimate, make the angle of divergence of whole LED light source emergent ray as far as possible little.It is light collecting device that the present invention devises aspheric surface collector lens, and devising Fresnel lens is collimating element, and the combination of three just can complete optically focused, and then is modified to directional light.

(3) manufacture experimently light illuminating unit module, and the depth of parallelism of light illuminating unit module, intensity of illumination, the uniformity, stability are tested.Adopt modular construction mode, just must first produce the light illuminating unit met the demands, first the LED illumination unit of some is integrated in a light illuminating unit module, then the depth of parallelism, intensity of illumination, the uniformity, stability etc. of this light illuminating unit module are tested.If LEDx chip selection is suitable, and the manufacture of light collecting device and collimating element also reaches designing requirement, and so measurement result also should meet design requirement;

(4) lighting simulation device is formed.Multiple light illuminating unit module integration is got up, just can form the light source of extensive parallel light.

Finally overall directional light simulator is tested.Global illumination system is tested, comprises the depth of parallelism of global illumination, intensity of illumination, the uniformity, stability etc., to verify the effect that light illuminating unit integrates.Extensive parallel light source is placed on rotating motion, just can simulated solar elevation angle, the depth of parallelism of light illuminating unit machines by precision optical machinery, ensure the depth of parallelism of total system, in the flatness that designing points must be placed on integrated morphology and rigidity; Use truss structure to ensure the rigidity of integrated morphology, use elasticity disc spring as the pad of reconciling flatness, realize light illuminating unit conciliation at grade by adjustment bolt presses power.

Below just by reference to the accompanying drawings, to make the extensive parallel optical analog system of a 10m × 10m, the present invention is described further.Extensive parallel optical analog system in this example, will realize 600nm ~ 700nm wave band radiant power 1800W on 10m × 10m area, 959nm ~ 989nm wave band radiant power 280W, there is no the power that monomer radiation source can reach so high at present.Therefore adopt low power radiation source LED array to reach radiated power requirements, while meeting irradiated area 10m × 10m, also have compressed the thickness of radiation matrix.

Extensive parallel optical analog system in this example, will simulate directional light in 600nm ~ 700nm ruddiness and 959nm ~ 989nm infrared light two wave bands, therefore selects the LED chip in two kinds of corresponding light spectral limits.

Design the light collecting device of non-spherical lens as single led chip, as shown in Figure 1.

The light collecting device of single led chip adopts non-spherical lens, and aspherical equation is:

$z=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-(1+k)c^2{r}^2}}+r^2+r^4+r^6+r^8$

r=11.4,c=-1,r ²=-2.144529e ^-10,r ⁴=-0.000482,r ⁶=-1.2e ^-5,r ⁸=-7.967429e ^-8

Z represents optical axis direction height; R represents vertical optical axis direction height; K represents asphericity coefficient; C represents vertex curvature.

Design the collimating element of Fresnel lens as single led chip, as shown in Figure 2.

Aspheric surface collector lens and Fresnel lens combine the collection and parallelization that just can complete single led chip emitted light, as shown in Figure 3.

The directional light light illuminating unit module of design 1m × 1m size, each unit module is made up of 14 × 14 LED illumination unit, 600nm ~ 700nm ruddiness with being spaced of 959nm ~ 989nm infrared light, as shown in Figure 4.

Multiple light illuminating unit module integration is got up, just can form extensive parallel optical simulator, as shown in Figure 5.Contour structures material object as shown in Figure 6.Fig. 7 is the actual grey design sketch of extensive parallel optical analog system.As can be seen from Figure 7, the depth of parallelism effect of this system is very good.

Actual physics result of the test shows, a kind of extensive parallel optical analog of the present invention technology is used for the directional light simulation system of actual fabrication, and fidelity is high, can reproduction moonscape photoenvironment true to nature in the spectral region required.Main technical content of the present invention can be applied to the development of the extensive parallel optical simulator in the deep space such as the moon, Mars detection Physics l-G simulation test in place.

The unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.

Claims (4)

1. an extensive parallel optical simulator, it is characterized in that: be spliced by M foursquare directional light light illuminating unit module, each directional light light illuminating unit module is rearranged by N number of 600nm ~ 700nm red-light LED light illuminating unit and N number of 959nm ~ 989nm infrared light LED illumination unit interval, each 600nm ~ 700nm red-light LED light illuminating unit or each 959nm ~ 989nm red-light LED light illuminating unit include single led chip, light collecting device and collimating element, and light collecting device and collimating element combination are collected and parallelization single led chip emitted light; The light collecting device of described single led chip adopts non-spherical lens, and aspherical equation is:

$z=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-(1+k)c^2{r}^2}}+r^2+r^4+r^6+r^8$

r＝11.4,c＝-1,r ²＝-2.144529e ^-10,r ⁴＝-0.000482,r ⁶＝-1.2e ^-5,r ⁸＝-7.967429e ^-8

Z represents optical axis direction height; R represents vertical optical axis direction height; K represents asphericity coefficient; C represents vertex curvature.

2. a kind of extensive parallel optical simulator according to claim 1, is characterized in that: the collimating element of described single led chip is Fresnel lens.

3. a kind of extensive parallel optical simulator according to claim 1, is characterized in that: the number of described M is for being no less than 49, and the number of N is for being no less than 10.

4. a kind of extensive parallel optical simulator according to claim 1, is characterized in that: the directional light light illuminating unit module of described 1m × 1m size is made up of 14 × 14 LED illumination unit.