GB1185322A - Structures Including Position Determining Apparatus. - Google Patents

Structures Including Position Determining Apparatus.

Info

Publication number
GB1185322A
GB1185322A GB2349866A GB2349866A GB1185322A GB 1185322 A GB1185322 A GB 1185322A GB 2349866 A GB2349866 A GB 2349866A GB 2349866 A GB2349866 A GB 2349866A GB 1185322 A GB1185322 A GB 1185322A
Authority
GB
United Kingdom
Prior art keywords
photo
cell
aerial
dish
distortion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2349866A
Inventor
James Clifford North
George Archer Clark
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Post Office
Original Assignee
Post Office
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Post Office filed Critical Post Office
Priority to GB2349866A priority Critical patent/GB1185322A/en
Publication of GB1185322A publication Critical patent/GB1185322A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/095—Refractive optical elements
    • G02B27/0972—Prisms
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0905—Dividing and/or superposing multiple light beams
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/106—Beam splitting or combining systems for splitting or combining a plurality of identical beams or images, e.g. image replication
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1086—Beam splitting or combining systems operating by diffraction only
    • G02B27/1093—Beam splitting or combining systems operating by diffraction only for use with monochromatic radiation only, e.g. devices for splitting a single laser source
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/144—Beam splitting or combining systems operating by reflection only using partially transparent surfaces without spectral selectivity
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/145—Beam splitting or combining systems operating by reflection only having sequential partially reflecting surfaces
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/147—Reflecting surfaces; Equivalent structures provided with means for controlling or monitoring the shape of the reflecting surface
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal

Abstract

1,185,322. Optical detection of aerial dish distortion. POST OFFICE. 30 June, 1967 [25 May, 1966], No. 23498/66. Heading H4D. The Specification describes an 85 feet diameter parabolic dish aerial fitted with apparatus comprising a laser multibeam light source and a plurality of photo-cells mounted on the dish, for determining departure of the shape of the dish from the ideal. The dish comprises a central portion 1, Fig. 1 and 24 outer sections 2 hinged on the central portion. Pairs of photo-cells 28, 29, Fig. 4, connected in opposition, are arranged in concentric rings 3, 4, 5, 6, 7 and 8. Ring 4 will provide a reference signal/ring 3 will indicate deviation of the aerial feed from its correct position and rings 5, 6, 7 and 8 indicate distortion of adjacent parts of the respective sector. An axially mounted prism 11 directs light from laser 9 to a stacked arrangement of pentaprisms 12 (see Fig. 2) which produce five divergent beams 23, 24, 25, 26, 27, which, when the prism arrangement is rotated, exactly scan the middle of the photo-cell pairs in the respective rings 4, 5, 6, 7, 8, when no distortion of the dish is present. The plurality of beams may alternately be produced as different diffraction orders of a diffraction grating. Each photocell pair is mounted to be normal to the incident light beam, such that distortion of a surrounding sector part causes the photo-cell pair to move whereby the light beam 23 illuminates one cell more than the other and the differential output of the pair gives an error signal, giving by magnitude and sign, the magnitude and sense of the distortion. The outputs of the photocells may be displayed on a multibeam oscilloscope as shown in Fig. 4, one line to each ring of detectors. Reference ring 4 on the non- distorting central aerial portion 1, produces display 41a. The output of the photo-cells may control servo means repositioning the aerial segments. Prism 15 is mounted on the aerial feed and then reflects by angle # the laser light -axially offset by prism 13-to scan photo-cell ring 3. If the feed mount is displaced along the axis by #X and perpendicular to the axis by #r, then The direction of #r is given by the direction of the photo-cell pair giving the maximum pulse height. (Alternatively, Fig. 5, three photo-cell pairs 42a/42, 43a/43, 44a/44, are connected to the aerial feed, and are scanned by beams 45 and 46 marking angles #1, and #2 respectively with the aerial axis. The pulse outputs of cell pairs 42a/42 and 43a/43 are added together to give a pulse height proportional to #X (tan # 1 + tan # 2 ). The individual pulse height from cell pairs 42a/42 and 44a/44 are approximately proportional to #y and #z respectively, where #y and #z are orthogonal components of #r. Beams 47 and 48 may be stationary, Fig. 6, and originate from the prisms and fall on photocell groups 49/50/51/52 and 53/54 respectively. If the pulse height from a photo-cell is indicated by the number of that cell, then (50 + 51) - (49 + 52)α#y (51 + 52) - (49 + 50)α#z (54 - 53)α#y + #X tan # (54 - 53) - (50 + 51) + (49 + 52)α#x tan #.
GB2349866A 1966-05-25 1966-05-25 Structures Including Position Determining Apparatus. Expired GB1185322A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2349866A GB1185322A (en) 1966-05-25 1966-05-25 Structures Including Position Determining Apparatus.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2349866A GB1185322A (en) 1966-05-25 1966-05-25 Structures Including Position Determining Apparatus.

Publications (1)

Publication Number Publication Date
GB1185322A true GB1185322A (en) 1970-03-25

Family

ID=10196596

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2349866A Expired GB1185322A (en) 1966-05-25 1966-05-25 Structures Including Position Determining Apparatus.

Country Status (1)

Country Link
GB (1) GB1185322A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022261517A1 (en) * 2021-06-11 2022-12-15 Innovusion, Inc. Transmitter channels of light detection and ranging systems
US11614521B2 (en) 2021-04-21 2023-03-28 Innovusion, Inc. LiDAR scanner with pivot prism and mirror
US11762065B2 (en) 2019-02-11 2023-09-19 Innovusion, Inc. Multiple beam generation from a single source beam for use with a lidar system
US11789128B2 (en) 2021-03-01 2023-10-17 Innovusion, Inc. Fiber-based transmitter and receiver channels of light detection and ranging systems

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11762065B2 (en) 2019-02-11 2023-09-19 Innovusion, Inc. Multiple beam generation from a single source beam for use with a lidar system
US11789128B2 (en) 2021-03-01 2023-10-17 Innovusion, Inc. Fiber-based transmitter and receiver channels of light detection and ranging systems
US11614521B2 (en) 2021-04-21 2023-03-28 Innovusion, Inc. LiDAR scanner with pivot prism and mirror
WO2022261517A1 (en) * 2021-06-11 2022-12-15 Innovusion, Inc. Transmitter channels of light detection and ranging systems

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees