GB1208213A - A filter system adapted to protect the eye or optical instruments against damage by optical radiation of harmful intensity - Google Patents

A filter system adapted to protect the eye or optical instruments against damage by optical radiation of harmful intensity

Info

Publication number
GB1208213A
GB1208213A GB1419668A GB1419668A GB1208213A GB 1208213 A GB1208213 A GB 1208213A GB 1419668 A GB1419668 A GB 1419668A GB 1419668 A GB1419668 A GB 1419668A GB 1208213 A GB1208213 A GB 1208213A
Authority
GB
United Kingdom
Prior art keywords
media
eye
protect
against damage
filter
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
GB1419668A
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.)
Eltro GmbH and Co
Original Assignee
Eltro GmbH and 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 Eltro GmbH and Co filed Critical Eltro GmbH and Co
Publication of GB1208213A publication Critical patent/GB1208213A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
    • G01C15/002—Active optical surveying means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/206—Filters comprising particles embedded in a solid matrix
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters
    • G02B5/24—Liquid filters
    • 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
    • G02F1/35—Non-linear optics
    • G02F1/3511—Self-focusing or self-trapping of light; Light-induced birefringence; Induced optical Kerr-effect
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping

Abstract

1,208,213. Filters. ELTRO G.m.b.H. & CO. GES FœR STRAHLUNGSTECHNIK. March 25, 1968 [March 25, 1967], No. 14196/68. Heading G2J. A filter to protect the eye or instruments against damage by optical radiation comprises two different filter media which have equal refractive indices at one radiation intensity and different refractive indices at a higher radiation intensity. Both media are preferably disposed in prismatically limited bodies, the filtering effect taking place by total internal reflection. One of the media may be a solid dielectric substance, which is dispersed in a liquid, a thermoplastic substance or a duroplastic substance as the second media. If two solid media are used, their contact may be contoured. The filter may be disposed in the plane of the entrance pupil of a telescope eye-piece.
GB1419668A 1967-03-25 1968-03-25 A filter system adapted to protect the eye or optical instruments against damage by optical radiation of harmful intensity Expired GB1208213A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEE0033684 1967-03-25

Publications (1)

Publication Number Publication Date
GB1208213A true GB1208213A (en) 1970-10-07

Family

ID=7076338

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1419668A Expired GB1208213A (en) 1967-03-25 1968-03-25 A filter system adapted to protect the eye or optical instruments against damage by optical radiation of harmful intensity

Country Status (5)

Country Link
BE (1) BE720160A (en)
CH (1) CH480642A (en)
FR (1) FR1557455A (en)
GB (1) GB1208213A (en)
NL (1) NL6804183A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4093353A (en) * 1976-12-17 1978-06-06 Honeywell Inc. Optical radiation limiter
EP0059593A1 (en) * 1981-03-02 1982-09-08 Imperial Chemical Industries Plc Method of and apparatus for monitoring gaseous pollutants
US4937442A (en) * 1983-05-27 1990-06-26 The United States Of America As Represented By The Secretary Of The Army Protective shutter
US5173811A (en) * 1991-10-11 1992-12-22 Gumbs Associates, Inc. Nonlinear optical shield
US5561541A (en) * 1984-09-05 1996-10-01 The United States Of America As Represented By The Secretary Of The Army Frustrated total internal reflection optical power limiter
US6014274A (en) * 1974-11-22 2000-01-11 Northrop Grumman Corporation Partially ablating laser resistant structures
US6016232A (en) * 1974-11-22 2000-01-18 Northrop Grumman Corporation Heat conducting laser resistant structures
US6028724A (en) * 1974-11-22 2000-02-22 Northrop Grumman Corporation Absorbent laser resistant structure
US7259925B1 (en) * 1989-10-20 2007-08-21 United States Of America As Represented By The Department Of The Army Optical power switch

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6014274A (en) * 1974-11-22 2000-01-11 Northrop Grumman Corporation Partially ablating laser resistant structures
US6016232A (en) * 1974-11-22 2000-01-18 Northrop Grumman Corporation Heat conducting laser resistant structures
US6028724A (en) * 1974-11-22 2000-02-22 Northrop Grumman Corporation Absorbent laser resistant structure
US4093353A (en) * 1976-12-17 1978-06-06 Honeywell Inc. Optical radiation limiter
EP0059593A1 (en) * 1981-03-02 1982-09-08 Imperial Chemical Industries Plc Method of and apparatus for monitoring gaseous pollutants
US4490043A (en) * 1981-03-02 1984-12-25 Imperial Chemical Industries Plc Method of and apparatus for monitoring gaseous pollutants
US4937442A (en) * 1983-05-27 1990-06-26 The United States Of America As Represented By The Secretary Of The Army Protective shutter
US5561541A (en) * 1984-09-05 1996-10-01 The United States Of America As Represented By The Secretary Of The Army Frustrated total internal reflection optical power limiter
US7259925B1 (en) * 1989-10-20 2007-08-21 United States Of America As Represented By The Department Of The Army Optical power switch
US5173811A (en) * 1991-10-11 1992-12-22 Gumbs Associates, Inc. Nonlinear optical shield

Also Published As

Publication number Publication date
DE1589721B2 (en) 1975-06-26
CH480642A (en) 1969-10-31
BE720160A (en) 1969-02-03
DE1589721A1 (en) 1970-09-10
FR1557455A (en) 1969-02-14
NL6804183A (en) 1968-09-26

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Legal Events

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