GB1381873A - Method of and an apparatus for testing optical devices or systems - Google Patents

Method of and an apparatus for testing optical devices or systems

Info

Publication number
GB1381873A
GB1381873A GB3177471A GB3177471A GB1381873A GB 1381873 A GB1381873 A GB 1381873A GB 3177471 A GB3177471 A GB 3177471A GB 3177471 A GB3177471 A GB 3177471A GB 1381873 A GB1381873 A GB 1381873A
Authority
GB
United Kingdom
Prior art keywords
component
output
photo
fed
mtf
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
GB3177471A
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.)
SIRA INSTITUTE
Original Assignee
SIRA INSTITUTE
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 SIRA INSTITUTE filed Critical SIRA INSTITUTE
Priority to GB3177471A priority Critical patent/GB1381873A/en
Publication of GB1381873A publication Critical patent/GB1381873A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/02—Testing optical properties
    • G01M11/0292—Testing optical properties of objectives by measuring the optical modulation transfer function

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

1381873 Testing lenses photo-electrically SIRA INSTITUTE 27 July 1972 [6 July 1971 24 Aug 1971] 31774/71 and 39727/71 Heading G1A To test an optical device or component 4 an image (of an object 30) formed by the component is scanned repetitively, e.g. by a rotating part-radial grating 10, to provide a modulated output from a photo-cell 12 having an A.C. and a D.C. component whose magnitudes are compared to give an indication of the modulation transfer function (MTF), of the component. Light from a slit or pinhole 30 is collimated by a lens or mirror 3. The output from photo-cell 12 is amplified at 25 and separated into A.C. and D.C. components by band-pass and low-pass filters 28 and 300 respectively. The D.C. output from 300 is compared in comparator 26 with a reference level, and the comparator output is fed-back to maintain the gain of amplifier 25 at unity. In this way the output of demodulator 29 is constantly normalized and represents the MTF of the component. In another embodiment, Figs. 6, 8 (not shown) the comparator output is fed-back to control the operating voltage of the photo-cell dynodes. A sample-and-hold circuit (160) may be provided in the feedback circuit so that the D.C. level is not monitored continuously, Fig. 7 (not shown). To make measurements at more than one spatial frequency the axis X-X of the grating 10 is rotated about the axis Y-Y of the optical system. This may be done in discrete steps or continuously, in which case the output from the demodulator 26 is smoothed by a filter (192) to produce an average MTF for the component which is fed to a meter (or lamp, if it is above a pre-set level). A way of measuring at different azimuthal angles is to divide the light from lens 7 into two beams which are directed to radially opposite portions of the grating 10, and are then supplied to different photo-cells by light guides, Figs. 9-11 (not shown). Alternatively the divided beams may be fed to separate gratings, Fig. 12, (not shown). To find a maximum MTF value for the component 4 the assembly G which may include a diffuser is driven parallel to the optical axis.
GB3177471A 1971-07-06 1971-07-06 Method of and an apparatus for testing optical devices or systems Expired GB1381873A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3177471A GB1381873A (en) 1971-07-06 1971-07-06 Method of and an apparatus for testing optical devices or systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB3177471A GB1381873A (en) 1971-07-06 1971-07-06 Method of and an apparatus for testing optical devices or systems
GB3972771 1971-08-24

Publications (1)

Publication Number Publication Date
GB1381873A true GB1381873A (en) 1975-01-29

Family

ID=26261068

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3177471A Expired GB1381873A (en) 1971-07-06 1971-07-06 Method of and an apparatus for testing optical devices or systems

Country Status (1)

Country Link
GB (1) GB1381873A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4832451A (en) * 1986-06-09 1989-05-23 The United States Of America As Represented By The Secretary Of The Army Collimator targets
FR2679654A1 (en) * 1991-07-23 1993-01-29 Thomson Csf IMAGING SYSTEM WITH INTEGRATED MEASUREMENT OF THE WEAR OF ITS OPTICAL ELEMENTS WORKING IN TRANSMISSION, AND OPTRONIC IMAGING EQUIPMENT COMPRISING SUCH AN IMAGING SYSTEM.
CN103411757A (en) * 2013-09-04 2013-11-27 中国计量科学研究院 Measuring system based on optical transfer function of endoscope with special spatial frequency and calibrating method thereof
CN113340424A (en) * 2021-06-18 2021-09-03 上海国科航星量子科技有限公司 Device and method for detecting performance of polarized light

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4832451A (en) * 1986-06-09 1989-05-23 The United States Of America As Represented By The Secretary Of The Army Collimator targets
FR2679654A1 (en) * 1991-07-23 1993-01-29 Thomson Csf IMAGING SYSTEM WITH INTEGRATED MEASUREMENT OF THE WEAR OF ITS OPTICAL ELEMENTS WORKING IN TRANSMISSION, AND OPTRONIC IMAGING EQUIPMENT COMPRISING SUCH AN IMAGING SYSTEM.
EP0528702A1 (en) * 1991-07-23 1993-02-24 Thomson-Csf Imaging system with integrated wear measurement of his optical elements working in transmission and optronic imaging equipment comprising such an imaging system
US5296705A (en) * 1991-07-23 1994-03-22 Thomson-Csf Imaging system with integrated measuring of the wear of its optical elements working in transmission mode and optronic imaging equipment comprising an imaging system such as this
CN103411757A (en) * 2013-09-04 2013-11-27 中国计量科学研究院 Measuring system based on optical transfer function of endoscope with special spatial frequency and calibrating method thereof
CN113340424A (en) * 2021-06-18 2021-09-03 上海国科航星量子科技有限公司 Device and method for detecting performance of polarized light

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee