GB2176022A - Parabolic reflector system - Google Patents

Parabolic reflector system Download PDF

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Publication number
GB2176022A
GB2176022A GB08512570A GB8512570A GB2176022A GB 2176022 A GB2176022 A GB 2176022A GB 08512570 A GB08512570 A GB 08512570A GB 8512570 A GB8512570 A GB 8512570A GB 2176022 A GB2176022 A GB 2176022A
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United Kingdom
Prior art keywords
reflector
point
energy
focus
waves
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Granted
Application number
GB08512570A
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GB2176022B (en
GB8512570D0 (en
Inventor
Eric Dudley
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Individual
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Individual
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Publication date
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Priority to GB08512570A priority Critical patent/GB2176022B/en
Publication of GB8512570D0 publication Critical patent/GB8512570D0/en
Publication of GB2176022A publication Critical patent/GB2176022A/en
Application granted granted Critical
Publication of GB2176022B publication Critical patent/GB2176022B/en
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • F24S23/79—Arrangements for concentrating solar-rays for solar heat collectors with reflectors with spaced and opposed interacting reflective surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S30/00—Arrangements for moving or orienting solar heat collector modules
    • F24S30/40—Arrangements for moving or orienting solar heat collector modules for rotary movement
    • F24S30/45—Arrangements for moving or orienting solar heat collector modules for rotary movement with two rotation axes
    • F24S30/452—Vertical primary axis
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
    • G02B19/0019—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having reflective surfaces only (e.g. louvre systems, systems with multiple planar reflectors)
    • G02B19/0023—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having reflective surfaces only (e.g. louvre systems, systems with multiple planar reflectors) at least one surface having optical power
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0038—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with ambient light
    • G02B19/0042—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with ambient light for use with direct solar radiation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
    • G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
    • G02B7/183—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors specially adapted for very large mirrors, e.g. for astronomy, or solar concentrators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/20—Producing pencil beam by two cylindrical focusing devices with their focal lines orthogonally disposed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S30/00—Arrangements for moving or orienting solar heat collector modules
    • F24S2030/10—Special components
    • F24S2030/13—Transmissions
    • F24S2030/131—Transmissions in the form of articulated bars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S30/00—Arrangements for moving or orienting solar heat collector modules
    • F24S2030/10—Special components
    • F24S2030/14—Movement guiding means
    • F24S2030/145—Tracks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/47—Mountings or tracking

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Optics & Photonics (AREA)
  • Sustainable Energy (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aerials With Secondary Devices (AREA)

Abstract

A device to focus to a point parallel electromagnetic or sound waves, eg a solar power station, that consists of a reflector KLMN curved in one direction to a parabola, that reflects incoming waves onto a secondary reflector PQRS which is also curved to a parabola in one direction only. The two reflectors are so placed so as to concentrate the incoming parallel waves to a point focus F. The polar axis EG of the secondary reflector PCRS forms an acute angle theta with the axial plane ABCD of the primary reflector KLMN. The device may be mounted on a mechanism to allow the device to track the source of energy, eg in the case of a solar power station, the sun. The device can be mounted so that as it tracks the source of energy the focal point F remains stationary. The operation of the device can be reversed to create outgoing parallel waves of energy from a point source F. <IMAGE>

Description

SPECIFICATION Oblique compound parabolic reflector The concentration of parallel waves of energy, such as solar energy to a point focus, or the creation of parallel waves of energy from a point source.
There are many applications forthe 'parabolic dish', for example in the collection of solar energy and in high frequency radio communications. The parabolic dish being a 3-dimensional curved reflector that concentrates parallel waves of energy to a point focus, or creates parallel waves from a point source.
The purpose of the following invention is to replicate the performance of a 'parabolic dish' using onlytwo dimensionally curved surfaces.
The device consists of two reflective surfaces, the primary reflector and secondary reflector, each being curved parabolically in only one direction, see figure 1. When used to concentrate parallel waves of energy to a point focus, the primary reflector, KLM N, is positioned such that its axial plane, ABCD, is parallel to the incoming 'rays' of energy, such as WK,XL,YM and ZN, and its polar axis AB is perpendiculartothose rays.The secondary reflector, PORS, is placed so that its axial plane, EGHJ, is perpendicularto the polar axis AB ofthe primary reflector, and placed so asto intercept the reflected waves from the primary reflector, such as KP, LQ, MR, and NS, and concentrate those raysto a pointfocus F. e, the angle between the polar axis EG of the secondary reflector and the axial plane ABCD may vary between, but not include, 0 and 90".
The general equation for a parabola y2=4ax describes the curve of the primary reflector, where 'a'=thefocal length. If'b'= the distance between the theoretical focal line of the primary reflector and the focal point F, measured perpendiculartothefocal line ofthe primary reflection, then the curve ofthe secondary reflector can be described by the expressiony2=2bx.
When the device is being used to create parallel rays from a point source the emanating rays strikethe secondary reflector and are reflected onto the primary reflector to produce parallel outgoing rays thetareparalleltotheaxial plane, ABCD, and perpendicularto the axis AB, such as WK, XL, YM and ZN.
3 embodiments of the invention will now be described by way of examples.
First emb o diment-Solarpo werstation.
Referring to Figure 2 the focal point F is a stationary point a little above ground level allowing thefocal energy collection and conversion apparatus to be stationary and on the ground. The device is mounted on a horizontal circulartrackto allow horizontal rotation. The primary reflector, ABCD, is pivoted about the horizontal axis EG that passes through the focal point F. The secondary reflector, HJKL, also rotates aboutthe axis EG and maintains a constant geometrical relationship with the primary reflector.
Thus the whole device may rotate in the vertical plane aboutthe axis EG. The angular rotation may be determined by a conventional hydraulic system or otherstandard mechanical device, and may be controlled by an automatic system to track the sun. A sliding shield, S, is provided that can move into a position between the focus F and the secondary reflector HJKL to reduce the amount of energy reaching the focus or cut it off altogether.
Second embodiment - Demountable solar cooker.
Referring to Figure 3 the focal point F is a stationary point a little above ground level. The device is mounted on a horizontal framework with slidersto allow horizontal rotation. The cooking potorchamber is also mounted on the framework at the focal point F.
The secondary reflector HJKL and the primary reflectorABCD both rotate aboutthe horizontal axis EG. When in operation the reflectors maintain a constant geometrical relationship with each other by means of a demountable structure. The angular position of the reflectors in the vertical plane about the axis EG is determined by a sliding adjustable strut or other standard mechanical device. The cooking area around the focus F is protected by a wind shield Wto reduce heat loss. When not in use the structure can be folded flat such that the secondary reflector is stored against the primary reflector thus occupying less space.
Third embodiment - Portable telecommunications transciever.
Referring to Figure 4, the receiver or transmitter is located at the focal point F. The device is mounted on a horizontal revolving mount. The primary reflector ABCD and the secondary reflector HJKL revolve in a vertical planeabouttheaxisEG.thatpassesthrough the focus F in such a way that when in operation the two reflectors maintain a constant geometrical relationship with each other by means of a demountable structure. The angular rotation in the horizontal and vertical planes may be determined by hydraulic rams or other standard mechanical means.
When not in use the secondary reflector can be folded against the primary reflector and if desired enclosed in a housing. This portabletransciever may be mounted on the back of a lorry, the roof rack of a car, be carried by hand or by any other means of transport.
1. A device to focus to a point, or generate from a point, electromagnetic, or sound, waves by means of a pairofreflectors each curved parabolically in one direction only and located such that the polar axis of the secondary reflector forms an acute angle with the axial plane ofthe primary reflector.
2. A device as claimed in Claim 1 wherein means are provided to locate the device in the horizontal and vertical planes.
3. A device as claimed in Claims 1 and 2wherein means are provided to interuptthe incoming waves before they reach the focus to cut off or reduce the energy reaching the focus.
4. A device as claimed in Claims 1 and 2 wherein means are provided to demountthe structure to take up less space when stored.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Oblique compound parabolic reflector The concentration of parallel waves of energy, such as solar energy to a point focus, or the creation of parallel waves of energy from a point source. There are many applications forthe 'parabolic dish', for example in the collection of solar energy and in high frequency radio communications. The parabolic dish being a 3-dimensional curved reflector that concentrates parallel waves of energy to a point focus, or creates parallel waves from a point source. The purpose of the following invention is to replicate the performance of a 'parabolic dish' using onlytwo dimensionally curved surfaces. The device consists of two reflective surfaces, the primary reflector and secondary reflector, each being curved parabolically in only one direction, see figure 1. When used to concentrate parallel waves of energy to a point focus, the primary reflector, KLM N, is positioned such that its axial plane, ABCD, is parallel to the incoming 'rays' of energy, such as WK,XL,YM and ZN, and its polar axis AB is perpendiculartothose rays.The secondary reflector, PORS, is placed so that its axial plane, EGHJ, is perpendicularto the polar axis AB ofthe primary reflector, and placed so asto intercept the reflected waves from the primary reflector, such as KP, LQ, MR, and NS, and concentrate those raysto a pointfocus F. e, the angle between the polar axis EG of the secondary reflector and the axial plane ABCD may vary between, but not include, 0 and 90". The general equation for a parabola y2=4ax describes the curve of the primary reflector, where 'a'=thefocal length. If'b'= the distance between the theoretical focal line of the primary reflector and the focal point F, measured perpendiculartothefocal line ofthe primary reflection, then the curve ofthe secondary reflector can be described by the expressiony2=2bx. When the device is being used to create parallel rays from a point source the emanating rays strikethe secondary reflector and are reflected onto the primary reflector to produce parallel outgoing rays thetareparalleltotheaxial plane, ABCD, and perpendicularto the axis AB, such as WK, XL, YM and ZN. 3 embodiments of the invention will now be described by way of examples. First emb o diment-Solarpo werstation. Referring to Figure 2 the focal point F is a stationary point a little above ground level allowing thefocal energy collection and conversion apparatus to be stationary and on the ground. The device is mounted on a horizontal circulartrackto allow horizontal rotation. The primary reflector, ABCD, is pivoted about the horizontal axis EG that passes through the focal point F. The secondary reflector, HJKL, also rotates aboutthe axis EG and maintains a constant geometrical relationship with the primary reflector. Thus the whole device may rotate in the vertical plane aboutthe axis EG. The angular rotation may be determined by a conventional hydraulic system or otherstandard mechanical device, and may be controlled by an automatic system to track the sun. A sliding shield, S, is provided that can move into a position between the focus F and the secondary reflector HJKL to reduce the amount of energy reaching the focus or cut it off altogether. Second embodiment - Demountable solar cooker. Referring to Figure 3 the focal point F is a stationary point a little above ground level. The device is mounted on a horizontal framework with slidersto allow horizontal rotation. The cooking potorchamber is also mounted on the framework at the focal point F. The secondary reflector HJKL and the primary reflectorABCD both rotate aboutthe horizontal axis EG. When in operation the reflectors maintain a constant geometrical relationship with each other by means of a demountable structure. The angular position of the reflectors in the vertical plane about the axis EG is determined by a sliding adjustable strut or other standard mechanical device. The cooking area around the focus F is protected by a wind shield Wto reduce heat loss. When not in use the structure can be folded flat such that the secondary reflector is stored against the primary reflector thus occupying less space. Third embodiment - Portable telecommunications transciever. Referring to Figure 4, the receiver or transmitter is located at the focal point F. The device is mounted on a horizontal revolving mount. The primary reflector ABCD and the secondary reflector HJKL revolve in a vertical planeabouttheaxisEG.thatpassesthrough the focus F in such a way that when in operation the two reflectors maintain a constant geometrical relationship with each other by means of a demountable structure. The angular rotation in the horizontal and vertical planes may be determined by hydraulic rams or other standard mechanical means. When not in use the secondary reflector can be folded against the primary reflector and if desired enclosed in a housing. This portabletransciever may be mounted on the back of a lorry, the roof rack of a car, be carried by hand or by any other means of transport. CLAIMS
1. A device to focus to a point, or generate from a point, electromagnetic, or sound, waves by means of a pairofreflectors each curved parabolically in one direction only and located such that the polar axis of the secondary reflector forms an acute angle with the axial plane ofthe primary reflector.
2. A device as claimed in Claim 1 wherein means are provided to locate the device in the horizontal and vertical planes.
3. A device as claimed in Claims 1 and 2wherein means are provided to interuptthe incoming waves before they reach the focus to cut off or reduce the energy reaching the focus.
4. A device as claimed in Claims 1 and 2 wherein means are provided to demountthe structure to take up less space when stored.
5. A device as claimed in Claims 1,2,3 or4 wherein a wind break is provided aroundthefocal point to prevent energy loss when the device is being used to collectsolar energy.
6. A device as claimed in Claims 1,2,3,4 or5 mounted in such a way that when the device tilts and turns the focal point remains stationary.
7. A device as claimed in Claims 1,2,3,4,5 or6 wherein means are provided to automaticallytrack the energy source.
GB08512570A 1985-05-17 1985-05-17 Oblique compound parabolic reflector Expired GB2176022B (en)

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Application Number Priority Date Filing Date Title
GB08512570A GB2176022B (en) 1985-05-17 1985-05-17 Oblique compound parabolic reflector

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GB08512570A GB2176022B (en) 1985-05-17 1985-05-17 Oblique compound parabolic reflector

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GB8512570D0 GB8512570D0 (en) 1985-06-19
GB2176022A true GB2176022A (en) 1986-12-10
GB2176022B GB2176022B (en) 1988-11-02

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003006895A1 (en) * 2001-07-10 2003-01-23 Scott Frazier Double reflecting solar concentrator
US6811271B2 (en) * 2001-05-17 2004-11-02 National Aerospace Laboratory Of Japan Electromagnetic wave focusing device
CN101968274A (en) * 2010-10-25 2011-02-09 北京印刷学院 Double parabolic cylinder reflection collimated-light focusing solar water heater
CN101460788B (en) * 2006-10-05 2012-02-29 卢嫩堡铸造工程有限公司 Two-stage solar concentrating system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109316083A (en) * 2018-11-15 2019-02-12 天津金久新能源科技有限公司 Broiler

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB627310A (en) * 1943-03-13 1949-08-05 Philips Nv Improvements in or relating to searchights
GB941813A (en) * 1960-09-15 1963-11-13 Llewellyn Ernest Hunt Improved means for concentrating solar energy

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB627310A (en) * 1943-03-13 1949-08-05 Philips Nv Improvements in or relating to searchights
GB941813A (en) * 1960-09-15 1963-11-13 Llewellyn Ernest Hunt Improved means for concentrating solar energy

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6811271B2 (en) * 2001-05-17 2004-11-02 National Aerospace Laboratory Of Japan Electromagnetic wave focusing device
WO2003006895A1 (en) * 2001-07-10 2003-01-23 Scott Frazier Double reflecting solar concentrator
CN101460788B (en) * 2006-10-05 2012-02-29 卢嫩堡铸造工程有限公司 Two-stage solar concentrating system
US8471187B2 (en) 2006-10-05 2013-06-25 Lunenburg Foundry & Engineering Limited Two-stage solar concentrating system
CN101968274A (en) * 2010-10-25 2011-02-09 北京印刷学院 Double parabolic cylinder reflection collimated-light focusing solar water heater
CN101968274B (en) * 2010-10-25 2012-04-04 北京印刷学院 Double parabolic cylinder reflection collimated-light focusing solar water heater

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Publication number Publication date
GB2176022B (en) 1988-11-02
GB8512570D0 (en) 1985-06-19

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