CN103791275A - Large-area parallel-light simulator - Google Patents

Abstract

The invention discloses a large-area parallel-light simulator. According to the characteristics of high luminous effect, low heating capacity, fast response, long service life and the like of LED chips, single LED chip is used as a light source, each LED uses an aspheric condenser lens as a condensation element, each Fresnel lens is used as a collimator, light condensation is completed by means of combination of the LED chips, the condensing elements and the collimators, and then modified to be of functions of parallel light. Multiple LED lighting units of different bands are combined to form a parallel-light lighting unit module to further form an overall large-area parallel-light simulator. Compared with the light sources of xenon lamps or halogen lamps, the light sources of the LED chips have the advantages that power consumption and radiating requirements are lowered greatly so that structural weight is reduced, the large-area parallel-light simulator becomes possible, and the problems about power, structure, optical design and the like during large-area parallel light simulation of conventional solar simulator are solved.

Description

A kind of large area directional light simulator

Technical field

The present invention relates to a kind of directional light simulator, relate in particular to a kind of large area directional light simulator, belong to spacecraft ground physical test technical field.

Background technology

Along with the development of China's aerospace industry, survey of deep space has proposed 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 large-area directional light simulation has been proposed to active demand.Tradition solar simulator manufacturing technology, normally take xenon lamp, Halogen lamp LED as light source, illuminating area generally 1 meter square under, cannot adapt to the demand of deep space detection class in place pilot project to illuminating area.Because the efficiency of these two kinds of light sources is not high, optical design, structural design and heat dissipation design to directional light analog machine have all proposed very high request, are therefore difficult to meet the demand of large-area directional light simulation.

Summary of the invention

Technical problem to be solved by this invention: overcome the deficiencies in the prior art, a kind of large area directional light simulator is provided, this simulator structure is simple, be easy to realize, carry out the simulation of large area directional light take LED device as light source, meet the test demand at aspects such as the depth of parallelism, spectral region, irradiation intensity, the uniformity, stabilitys.

Technical solution of the present invention is: a kind of large area directional light simulator, be spliced by M foursquare directional light light illuminating unit module, each directional light light illuminating unit module is spaced and is formed by N 600nm～700nm red-light LED light illuminating unit and N 959nm～989nm infrared light LED light illuminating unit, 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 light illuminating units.

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 the light collecting device of aspheric surface collector lens as LED, Fresnel lens is as the collimating element of LED, three's combination just can complete optically focused, then be modified to the function of directional light, by the single led LED light illuminating unit that forms of different spectral coverage, and then form whole large area directional light simulator, compare xenon lamp or halogen light source, use LED chip to greatly reduce power consumption, the requirement of heat radiation, thereby reduce construction weight, make the simulation of large area directional light become possibility, solve the power that traditional solar simulator runs in the time that large area directional light is simulated, structure, the problem of the aspects such as optical design, apply this technology, can make large area directional light analog machine to measure for concrete physical simulation test, meet the physical simulation test that has the simulation of large area directional light.

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 large area directional light simulator;

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

Fig. 7 is the actual irradiation design sketch of large area directional light simulation system.

The specific embodiment

Realization approach of the present invention is:

(1) select suitable LED chip.LED is the light source of narrow spectrum, and the light wavelength major part 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 of selecting appropriate light spectral limit and power combines, the illumination that just can meet with a response in spectral region.Meanwhile, determine the power of selected LED according to desired intensity of illumination.

(2) design light collecting device, the collimating element of single led light illuminating unit.LED light source is a kind of approximate Lambertian source, be that light distribution is the cosine distribution take the axis perpendicular to light-emitting area as zero angle, if directly LED is applied to illumination, can on plane of illumination, form an inhomogeneous circular light spot, center is the brightest, and can be along with the increase brightness meeting decay of radius, in order to overcome this shortcoming, need to carry out secondary optical design, the light that need to send each LED chip is fully collected and collimates, and makes 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 has designed aspheric surface collector lens, and having designed Fresnel lens is collimating element, and three's combination just can complete optically focused, and then is modified to directional light.

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

(4) form lighting simulation device.Multiple light illuminating unit module integrations are got up, just can form the light source of large area directional light.

Finally overall directional light simulator is tested.Global illumination system is tested, comprise depth of parallelism, intensity of illumination, the uniformity, stability of global illumination etc., with the effect of verifying that light illuminating unit integrates.Large area source of parallel light is placed on rotating motion, just can simulated solar elevation angle, the depth of parallelism of light illuminating unit machines by precision optical machinery, guarantee the depth of parallelism of total system, design main points must be placed in the flatness and rigidity of integrated morphology; Use truss structure to guarantee the rigidity of integrated morphology, use elasticity dish spring as the pad of reconciling flatness, realize light illuminating unit conciliation at grade by adjusting bolt thrust.

Just by reference to the accompanying drawings, to make the large area directional light simulation system of a 10m × 10m, the present invention is described further below.Large area directional light simulation system in this example realize 600nm～700nm wave band radiant power 1800W on 10m × 10m area, and 959nm～989nm wave band radiant power 280W there is no at present monomer radiation source and can reach so high power.Therefore adopt low power radiation source LED array to reach radiant power requirement, in meeting irradiated area 10m × 10m, also compressed the thickness of radiation matrix.

Large area directional light simulation system in this example be simulated directional light in 600nm～700nm ruddiness and two wave bands of 959nm～989nm infrared light, therefore selects two kinds of LED chips in corresponding light spectral limit.

Design non-spherical lens is as the light collecting device of 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 Fresnel lens is as the collimating element of single led chip, as shown in Figure 2.

Aspheric surface collector lens and Fresnel lens are combined collection and the 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, is made up of 14 × 14 LED light illuminating units on each unit module, 600nm～700nm ruddiness and being spaced of 959nm～989nm infrared light, as shown in Figure 4.

Multiple light illuminating unit module integrations are got up, just can form large area directional light simulator, as shown in Figure 5.Contour structures material object as shown in Figure 6.Fig. 7 is the actual grey design sketch of large area directional light simulation 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 large area directional light of the present invention analogue technique is for the directional light simulation system of actual fabrication, and fidelity is high, can reproduction moonscape photoenvironment true to nature in the spectral region requiring.Main technical content of the present invention can be applied to the development of the large area directional light 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 (5)

1. a large area directional light 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 spaced and is formed by N 600nm～700nm red-light LED light illuminating unit and N 959nm～989nm infrared light LED light illuminating unit, 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.

2. a kind of large area directional light simulator according to claim 1, is characterized in that: 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.

3. a kind of large area directional light simulator according to claim 1, is characterized in that: the collimating element of described single led chip is Fresnel lens.

4. a kind of large area directional light 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.

5. a kind of large area directional light 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 light illuminating units.

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