GB2236181B - Optical measuring instruments - Google Patents

Optical measuring instruments

Info

Publication number
GB2236181B
GB2236181B GB9019648A GB9019648A GB2236181B GB 2236181 B GB2236181 B GB 2236181B GB 9019648 A GB9019648 A GB 9019648A GB 9019648 A GB9019648 A GB 9019648A GB 2236181 B GB2236181 B GB 2236181B
Authority
GB
United Kingdom
Prior art keywords
optical measuring
measuring instruments
instruments
optical
measuring
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 - Fee Related
Application number
GB9019648A
Other versions
GB2236181A (en
GB9019648D0 (en
Inventor
Michael John Downs
Keith Patrick Birch
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.)
BTG International Ltd
National Research Development Corp UK
Original Assignee
National Research Development Corp UK
British Technology Group Ltd
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 National Research Development Corp UK, British Technology Group Ltd filed Critical National Research Development Corp UK
Publication of GB9019648D0 publication Critical patent/GB9019648D0/en
Publication of GB2236181A publication Critical patent/GB2236181A/en
Application granted granted Critical
Publication of GB2236181B publication Critical patent/GB2236181B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
    • G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
GB9019648A 1989-09-08 1990-09-07 Optical measuring instruments Expired - Fee Related GB2236181B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB898920366A GB8920366D0 (en) 1989-09-08 1989-09-08 Optical measuring instruments

Publications (3)

Publication Number Publication Date
GB9019648D0 GB9019648D0 (en) 1990-10-24
GB2236181A GB2236181A (en) 1991-03-27
GB2236181B true GB2236181B (en) 1993-07-28

Family

ID=10662775

Family Applications (2)

Application Number Title Priority Date Filing Date
GB898920366A Pending GB8920366D0 (en) 1989-09-08 1989-09-08 Optical measuring instruments
GB9019648A Expired - Fee Related GB2236181B (en) 1989-09-08 1990-09-07 Optical measuring instruments

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB898920366A Pending GB8920366D0 (en) 1989-09-08 1989-09-08 Optical measuring instruments

Country Status (4)

Country Link
EP (1) EP0490957A1 (en)
JP (1) JPH05500419A (en)
GB (2) GB8920366D0 (en)
WO (1) WO1991003729A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3351527B2 (en) * 1991-11-08 2002-11-25 ブリテイッシュ・テクノロジー・グループ・リミテッド Measuring device
US6124931A (en) * 1997-10-02 2000-09-26 Zygo Corporation Apparatus and methods for measuring intrinsic optical properties of a gas
US6330065B1 (en) 1997-10-02 2001-12-11 Zygo Corporation Gas insensitive interferometric apparatus and methods
EP1019703A1 (en) * 1997-10-02 2000-07-19 Zygo Corporation Interferometric method and apparatus
US6219144B1 (en) 1997-10-02 2001-04-17 Zygo Corporation Apparatus and method for measuring the refractive index and optical path length effects of air using multiple-pass interferometry
JP3332366B2 (en) * 1998-02-23 2002-10-07 ザイゴ コーポレイション Apparatus and method for measuring intrinsic optical properties of gas

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2455271A1 (en) * 1979-04-24 1980-11-21 Electricite De France Measuring leakage from pressurised container - is determined by calculator from change in refractive index of contents
EP0094836A1 (en) * 1982-05-18 1983-11-23 National Research Development Corporation Apparatus and method for measuring refractive index
EP0163847A2 (en) * 1984-04-14 1985-12-11 Firma Carl Zeiss Interferential refractometer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4558952A (en) * 1983-02-22 1985-12-17 Kules Vladimir P Method for measuring an optical length of light path and a laser interferometer for carrying same into effect

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2455271A1 (en) * 1979-04-24 1980-11-21 Electricite De France Measuring leakage from pressurised container - is determined by calculator from change in refractive index of contents
EP0094836A1 (en) * 1982-05-18 1983-11-23 National Research Development Corporation Apparatus and method for measuring refractive index
EP0163847A2 (en) * 1984-04-14 1985-12-11 Firma Carl Zeiss Interferential refractometer

Also Published As

Publication number Publication date
JPH05500419A (en) 1993-01-28
EP0490957A1 (en) 1992-06-24
WO1991003729A1 (en) 1991-03-21
GB8920366D0 (en) 1989-10-25
GB2236181A (en) 1991-03-27
GB9019648D0 (en) 1990-10-24

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19950907