CA954720A - Thickness measuring method - Google Patents

Thickness measuring method

Info

Publication number
CA954720A
CA954720A CA138,646A CA138646A CA954720A CA 954720 A CA954720 A CA 954720A CA 138646 A CA138646 A CA 138646A CA 954720 A CA954720 A CA 954720A
Authority
CA
Canada
Prior art keywords
measuring method
thickness measuring
thickness
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
Application number
CA138,646A
Other versions
CA138646S (en
Inventor
James L. Fergason
Thomas B. Harsch
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.)
International Liquid Xtal Co
Original Assignee
International Liquid Xtal Co
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 International Liquid Xtal Co filed Critical International Liquid Xtal Co
Application granted granted Critical
Publication of CA954720A publication Critical patent/CA954720A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/132—Thermal activation of liquid crystals exhibiting a thermo-optic effect
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
    • G01B15/02—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring thickness

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
CA138,646A 1971-04-07 1972-03-30 Thickness measuring method Expired CA954720A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13206071A 1971-04-07 1971-04-07
US22646872A 1972-02-15 1972-02-15

Publications (1)

Publication Number Publication Date
CA954720A true CA954720A (en) 1974-09-17

Family

ID=26830061

Family Applications (1)

Application Number Title Priority Date Filing Date
CA138,646A Expired CA954720A (en) 1971-04-07 1972-03-30 Thickness measuring method

Country Status (3)

Country Link
CA (1) CA954720A (en)
DE (1) DE2216567A1 (en)
FR (1) FR2136279A5 (en)

Also Published As

Publication number Publication date
DE2216567A1 (en) 1972-10-19
FR2136279A5 (en) 1972-12-22

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