CN106405694B - Off-axis non-rotational symmetry superposition hot spot light-focusing Fresnel lens and preparation method thereof - Google Patents
Off-axis non-rotational symmetry superposition hot spot light-focusing Fresnel lens and preparation method thereof Download PDFInfo
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- CN106405694B CN106405694B CN201611081846.8A CN201611081846A CN106405694B CN 106405694 B CN106405694 B CN 106405694B CN 201611081846 A CN201611081846 A CN 201611081846A CN 106405694 B CN106405694 B CN 106405694B
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
Abstract
The invention discloses a kind of off-axis non-rotational symmetries to be superimposed hot spot light-focusing Fresnel lens and preparation method thereof, the Fresnel Lenses is made of four isosceles right triangle unit spliceds, four isosceles right triangle units are symmetrical along reference axis, imprinting has annulus, the annulus to be arranged using off-axis non-rotational symmetry mode on each isosceles right triangle unit.The off-axis non-rotational symmetry superposition square focus spot uniform condensing Fresnel Lenses of the present invention is spliced by four identical isosceles right triangle unit seamless, each annulus has abandoned the intrinsic donut structure of traditional Fresnel Lenses in lens face, each annulus focuses design using off-axis non-rotational symmetry, has many advantages, such as simple in structure, easy to implement.
Description
【Technical field】
The invention belongs to collector lens technical fields, and in particular to one kind being applied to light gathering photovoltaic power generating system non-rotation off axis
Turn symmetrical superposition square focus spot uniform condensing Fresnel Lenses and preparation method thereof.
【Background technology】
Photovoltaic generation is a kind of principal mode that solar energy directly utilizes, and Fresnel Lenses is the core of concentration photovoltaic system
The quality of one of component, performance directly affects the performance of whole system, and traditional point light-focusing Fresnel lens are due to optically focused
The Energy distribution of hot spot is uneven, and incident sunlight through forming hot localised points in battery surface after optically focused, deposit by hot localised points
Battery conversion efficiency can be reduced on the one hand, on the other hand can damage battery, shortened battery, led to photovoltaic
The photoelectric conversion efficiency of electricity generation system is low.In addition, the focal beam spot and solar battery sheet of traditional point light-focusing Fresnel lens
Shape mismatch, but also the utilization ratio of solar energy is generally relatively low.
【Invention content】
It is applied in view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing one kind
The off-axis non-rotational symmetry of light gathering photovoltaic power generating system is superimposed square focus spot uniform condensing Fresnel Lenses.This is off-axis non-rotating right
Claim superposition square focus spot uniform condensing Fresnel Lenses not only optically focused high uniformity, and it is the rectangular and sun to assemble light spot shape
Energy battery plate shape matching is good, can effectively improve the efficiency of solar energy power generating.
The present invention uses following technical scheme：
Off-axis non-rotational symmetry is superimposed hot spot light-focusing Fresnel lens, and the Fresnel Lenses is by four isosceles right angle trigonometries
Shape unit spliced is constituted, and four isosceles right triangle units are symmetrical along reference axis, each isosceles right angle three
Imprinting has annulus, the annulus to be arranged using off-axis non-rotational symmetry mode on corner shaped elements.
Further, annulus imprinting since the right angle of the isosceles right triangle unit.
Further, the bevel edge of the isosceles right triangle unit be the first side, two right-angle sides be respectively the second side and
Third side, the first side of four isosceles right triangle units, which joins end to end, forms the square-lens of the Fresnel Lenses
Face.
Further, it is both provided with focal axis on each isosceles right triangle unit, light passes through four respectively
The focal axis of the isosceles right triangle unit is superimposed to form hot spot.
Further, described be superimposed is specially：When light a, b (or light c, d) intersects, the institute of four quadrants generation
It is completely overlapped to state hot spot, whole light pass through out of described square-lens face, gradually subtract in focal length f foregoing description spot size
Small, the spot size reaches minimum value at the positions focal length f, and the hot spot starts to dissipate after focal length f, wherein light a and
C is the rim ray after incident beam is reflected through the Fresnel Lenses first quartile, and light b and d are that the Fresnel is saturating
The corresponding rim ray of mirror third quadrant.
A kind of preparation method of off-axis non-rotational symmetry superposition hot spot light-focusing Fresnel lens, includes the following steps：
S1：Square-lens length of side L, focal length f, focal spot length of side L are determined according to the size of solar battery sheet first0And lens
Annulus facewidth w parameters；
S2：According to off-axis non-rotational symmetry principle of stacking, corresponding lens are calculated separately using the obtained parameters of step S1
Optical axis coordinate shift amount S and lens focus focal length F off axis, specific as follows：
S3：According to formulaAnnulus number N is obtained, according to formulaObtain annulus radius of curvature rj,
According to formulaObtain annulus inclination alphaj, according to formula dj=wtg αjObtain sawtooth height
Spend dj, wherein the N of j=1,2,3 ..., n are the refractive index of lens material, and the Fresnel Lenses is prepared according to the above parameter.
Compared with prior art, the present invention at least has the advantages that：
The present invention off-axis non-rotational symmetry superposition square focus spot uniform condensing Fresnel Lenses is identical etc. by four
Waist right angled triangle unit seamless is spliced, and each annulus has abandoned the intrinsic concentric circles of traditional Fresnel Lenses in lens face
Ring structure, each annulus focus design using off-axis non-rotational symmetry, have many advantages, such as simple in structure, easy to implement.
Further, the Fresnel Lenses focal beam spot is rectangular, is matched with the shape of solar battery sheet, effectively
Improve the utilization rate of solar energy；The Fresnel Lenses has higher optically focused uniformity, effectively prevents conventional point optically focused
The hot localised points of the uneven formation of Fresnel Lenses optically focused, improve the service life of solar cell.
The invention also discloses off-axis non-rotational symmetry be superimposed square focus spot uniform condensing Fresnel Lenses preparation method,
This method is easy to operate, is easy to produce in batches, and the lens arrangement of preparation is simple, and cost is relatively low.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
【Description of the drawings】
Fig. 1 is the front view that 1 off-axis non-rotational symmetry of embodiment is superimposed square focus spot uniform condensing Fresnel Lenses；
Fig. 2 is the tomograph that 1 off-axis non-rotational symmetry of embodiment is superimposed square focus spot uniform condensing Fresnel Lenses；
Fig. 3 is the front view of 1 isosceles right triangle unit Fresnel Lenses of embodiment；
Fig. 4 is 2 off-axis non-rotational symmetry addition method principle schematic of embodiment；
Fig. 5 is irradiance distribution figure of 1 focal beam spot of embodiment in horizontal plane；
Fig. 6 is Fig. 5 focal beam spot irradiance distribution sectional views.
Wherein：1. Fresnel Lenses；2. isosceles right triangle unit；3. the first side；4. the second side；5. third side.
【Specific implementation mode】
The invention will be further described with reference to the accompanying drawings and examples.But this should not be interpreted as to the above-mentioned master of the present invention
The range of topic is only limitted to following embodiment, and all technologies realized based on foregoing invention content are all belonged to the scope of the present invention.
Off-axis non-rotational symmetry superposition square focus spot uniform condensing Fresnel Lenses of the present invention is identical etc. by four
Waist right angled triangle unit 2 is spliced.The ascending ring of the lens face imprinting of the isosceles right triangle unit 2
Band, it is intrinsic to have abandoned traditional Fresnel Lenses for each annulus in the lens face of the isosceles right triangle unit Fresnel Lenses
Donut structure, each annulus focuses design using off-axis non-rotational symmetry, and the inclination angle of each annulus, tooth are high and bent
Rate radius is not quite similar.
The lens face of the isosceles right triangle unit 2 includes first at 3, second 4 and third side 5, wherein first
Side 3 be the isosceles right triangle bevel edge, second at 4 and the 4th 5 be two waist of the isosceles right triangle, the second side
4 and the 4th the angle on side 5 be 90 °.
The lens face of the off-axis non-rotational symmetry superposition square focus spot uniform condensing Fresnel Lenses is rectangular, by four
First side 3 of isosceles right triangle unit Fresnel Lenses, which is sequentially connected end to end in turn, to be spliced, and described four the first sides 3 are mutually
90 °, four isosceles right triangle unit Fresnel Lenses distributions are completely the same and about coordinate axial symmetry.
There are one corresponding focal axis, light passes through described in four each isosceles right triangle unit 2
Four hot spots formed on respective focal axis after the Fresnel Lenses that isosceles right triangle unit 2 forms come by superposition
Improve the uniformity of optically focused.
Embodiment 1
The front view of off-axis non-rotational symmetry superposition square focus spot uniform condensing Fresnel Lenses 1 is as schemed described in the present embodiment
Shown in 1.It is sequentially connected end to end in turn by the first side 3 of four identical isosceles right triangle units 2 (as shown in Figure 3)
It is seamless spliced to form；Described four the first sides 3 are mutually in 90 °, and four isosceles right triangle unit Fresnel Lenses distributions are complete
Unanimously and about coordinate axial symmetry.
The lens face imprinting of the isosceles right triangle unit 2 ascending annulus, the lens face include
First at 3, second 4 and 5 arc side of third side；Described first while 3 two endpoints respectively with second while 4 and third side 5 connect.
Embodiment 2
The additive process of off-axis non-rotational symmetry superposition square focus spot uniform condensing Fresnel Lenses described in the present embodiment
As shown in Figure 4.
Since four quadrant annulus distributions are symmetrical, illustrated by taking the first and third quadrant as an example.As shown in figure 4, light
A, c is the rim ray after incident beam is reflected through square-lens first quartile, and light b, d are square-lens third quadrant pair
The rim ray answered.By edge optical principle it is found that when light a, b (or light c, d) intersects, the light of four quadrants generation
Spot is completely overlapped, and whole light pass through out of this square region, thus i.e. can determine uniform light spots output position focal length f and
Size L0.By geometric optics knowledge it is found that spot size is gradually reduced before focal length f, spot size reaches at the positions focal length f
To minimum value, start to dissipate later, f is the focal length of lens thus.
Embodiment 3
The preparation process of isosceles right triangle unit 2 described in the present embodiment is as follows：
S1：Square-lens length of side L, focal length f and focal spot length of side L are determined according to the size of solar battery sheet first0, lens
The parameters such as annulus facewidth w；
S2：Then corresponding optical axis coordinate shift amount S and lens are calculated according to off-axis non-rotational symmetry principle of stacking
It is off-axis to focus focal length F；
S3：Annulus number N, annulus radius of curvature r is finally calculatedj, annulus inclination alphajAnd sawtooth height djEqual Fresnels
Thoroughly
The design parameter of mirror generates solid lens.
nsinαj=sin [αj+arctg(rj/F)]；
dj=wtg αj；
Wherein, the N of j=1,2,3 ..., n are the refractive index of lens material, and the Fresnel Lenses is prepared according to the above parameter.
From fig. 5, it can be seen that the focusing of the off-axis non-rotational symmetry superposition square focus spot uniform condensing Fresnel Lenses
Light spot shape is rectangular, is matched with solar cell plate shape.
From fig. 6, it can be seen that being 8 × 10 in (- 2,2) mm range inner focusing hot spot irradiation level maximum values7W/m2, minimum value
It is 7 × 107W/m2, the optically focused uniformity is up to 93.3%.
Claims (3)
1. off-axis non-rotational symmetry is superimposed hot spot light-focusing Fresnel lens, it is characterised in that：The Fresnel Lenses (1) is by four
Isosceles right triangle unit (2) is spliced to form, and four isosceles right triangle units (2) are symmetrical along reference axis,
Imprinting has annulus, the annulus to be arranged using off-axis non-rotational symmetry mode on each isosceles right triangle unit (2),
Annulus imprinting since the right angle of the isosceles right triangle unit (2)；The isosceles right triangle unit (2)
Bevel edge is the first side (3), and two right-angle sides are respectively second at (4) and third (5), four isosceles right triangle units
(2) the first side (3), which joins end to end, forms the square-lens face of the Fresnel Lenses (1), each isosceles right angle trigonometry
Focal axis is both provided on shape unit (2), light is folded by the focal axis of four isosceles right triangle units (2) respectively
Add to form hot spot.
2. a kind of off-axis non-rotational symmetry according to claim 1 is superimposed hot spot light-focusing Fresnel lens, which is characterized in that
The superposition is specially：When light a, b (or light c, d) intersects, the hot spot that four quadrants generate is completely overlapped, entirely
Portion's light passes through out of described square-lens face, is gradually reduced in focal length f foregoing description spot sizes, at the positions focal length f
The spot size reaches minimum value, and the hot spot starts to dissipate after focal length f, wherein light a and c is incident beam through institute
The rim ray after the refraction of Fresnel Lenses (1) first quartile is stated, light b and d are the Fresnel Lenses (1) third quadrant
Corresponding rim ray.
3. a kind of preparation method of non-rotational symmetry superposition hot spot light-focusing Fresnel lens off-axis as claimed in claim 1 or 2, packet
Include following steps：
S1：Square-lens length of side L, focal length f, focal spot length of side L are determined according to the size of solar battery sheet first0With lens-ring band
Facewidth w parameters；
S2：According to off-axis non-rotational symmetry principle of stacking, corresponding lens axis is calculated separately using the obtained parameters of step S1
Coordinate shift amount S and lens focus focal length F off axis, specific as follows：
S3：According to formulaAnnulus number N is obtained, according to formulaObtain annulus radius of curvature rj, according to
Formula nsin αj=sin [αj+arctg(rj/ F)] obtain annulus inclination alphaj, according to formula dj=wtg αjObtain sawtooth height
dj, wherein the N of j=1,2,3 ..., n are the refractive index of lens material, and the Fresnel Lenses is prepared according to the above parameter.
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| CN102645686B (en) * | 2012-05-18 | 2014-04-02 | 哈尔滨工业大学 | Design method of uniformly-converging Fresnel lens |
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