GB1348640A - Measuring apparatus and systems - Google Patents

Measuring apparatus and systems

Info

Publication number
GB1348640A
GB1348640A GB1348640DA GB1348640A GB 1348640 A GB1348640 A GB 1348640A GB 1348640D A GB1348640D A GB 1348640DA GB 1348640 A GB1348640 A GB 1348640A
Authority
GB
United Kingdom
Prior art keywords
prism
platform
light
counts
sept
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
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.)
Science Research Council
Original Assignee
Science Research Council
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 Science Research Council filed Critical Science Research Council
Publication of GB1348640A publication Critical patent/GB1348640A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/266—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light by interferometric means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Instruments For Measurement Of Length By Optical Means (AREA)

Abstract

1348640 Digital measurement SCIENCE RESEARCH COUNCIL 2 Sept 1971 [4 Sept Sept 1970] 42605/70 Heading G4H [Also in Division G1] A light beam 12 (Fig. 1) e.g. from a laser, is directed by a partially transparent mirror 6 on to a wedge shaped prism 5 so that interference bands are created between light incident on one surface of the prism and light reflected from the other surface, the interference bands being photo-electrically detected. In the embodiment of Fig. 1 light is incident on the movable prism at an angle α where sine α=n sin e (where n is the refractive index of the prism and e is the angle of the prism) so that light is reflected from the top surface of the prism and also reflected perpendicularly from the bottom surface. Several photo-electric detectors may be used in a digitizing head 10 so that the direction of movement of the prism may be determined. In the embodiment of Fig. 3, for two dimensional measurement, two prisms 5A, 5B at right angles to each other are mounted on a platform 16. An object is mounted on a platform 26, a desired point on the object being then placed beneath an objective length 24. The counts in a digitizing head 28A mounted over the prism 5A and in two heads 28B, 28C mounted above prism 5B are read out and then the platform 26 is moved to bring another desired point between the objective 24, a new reading of the count then being taken. Provided no angular movement of the platform 16 occurs the counts in heads 28B, 28C will remain in step but the counts may be combined in known manner to correct for errors induced by angular deviations.
GB1348640D 1970-09-04 1970-09-04 Measuring apparatus and systems Expired GB1348640A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4260570 1970-09-04

Publications (1)

Publication Number Publication Date
GB1348640A true GB1348640A (en) 1974-03-20

Family

ID=10425173

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1348640D Expired GB1348640A (en) 1970-09-04 1970-09-04 Measuring apparatus and systems

Country Status (1)

Country Link
GB (1) GB1348640A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2677752A1 (en) * 1991-06-11 1992-12-18 Sextant Avionique Interferometric sensor for large displacements
CN104042227A (en) * 2013-03-15 2014-09-17 西门子公司 X-ray recording system for differential phase contrast imaging of an examination object by way of phase stepping
CN107478156A (en) * 2017-07-12 2017-12-15 中国航空工业集团公司西安飞行自动控制研究所 A kind of Optical displacement sensor based on recombined white light interfered device
CN110398783A (en) * 2019-07-26 2019-11-01 南京熊猫电子股份有限公司 A kind of sensing and detecting system for gate equipment

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2677752A1 (en) * 1991-06-11 1992-12-18 Sextant Avionique Interferometric sensor for large displacements
CN104042227A (en) * 2013-03-15 2014-09-17 西门子公司 X-ray recording system for differential phase contrast imaging of an examination object by way of phase stepping
DE102013204604A1 (en) * 2013-03-15 2014-09-18 Siemens Aktiengesellschaft X-ray system for differential phase-contrast imaging of an examination object with phase-stepping
CN107478156A (en) * 2017-07-12 2017-12-15 中国航空工业集团公司西安飞行自动控制研究所 A kind of Optical displacement sensor based on recombined white light interfered device
CN110398783A (en) * 2019-07-26 2019-11-01 南京熊猫电子股份有限公司 A kind of sensing and detecting system for gate equipment

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Legal Events

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