ISO/FDIS 9335

Optics and photonics — Optical transfer function — Principles and procedures of measurement

ISO 9335:2012 gives general guidance for the construction and use of equipment for measurement of the optical transfer function (OTF) of imaging systems. It specifies important factors that can influence the measurement of the OTF, and gives general rules for equipment performance requirements and environmental controls. It specifies important precautions that should be taken to ensure accurate measurements and correction factors to be applied to the collected data.

Optique et photonique — Fonction de transfert optique — Principes et procédures de mesure

L'ISO 9335:2012 fournit des lignes directrices concernant la construction et l'utilisation d'équipements pour mesurer la fonction de transfert optique (OTF) de systèmes de formation d'image. L'ISO 9335:2012 spécifie les facteurs importants pouvant influencer le mesurage de I'OTF, et donne des règles générales concernant les exigences de performance de l'équipement et les conditions d'environnement. Elle spécifie les précautions majeures à prendre pour assurer l'exactitude des mesurages et indique les facteurs de correction à appliquer éventuellement aux données recueillies.

General Information

• Status: Not Published
• ICS: 17.180.01 - Optics and optical measurements in general
• Technical Committee: ISO/TC 172/SC 1 - Fundamental standards
• Drafting Committee: ISO/TC 172/SC 1 - Fundamental standards
• Current Stage: 4060 - Close of voting
• Start Date: 12-Aug-2024
• Due Date: 13-Aug-2024
• Completion Date: 13-Aug-2024

Relations

• Revises: ISO 9335:2012 - Optics and photonics — Optical transfer function — Principles and procedures of measurement
• Effective Date: 05-Nov-2022

Standards Content (Sample)

FINAL DRAFT
International
Standard
ISO/TC 172/SC 1
Optics and photonics — Optical
Secretariat: DIN
transfer function — Principles and
Voting begins on:
procedures of measurement
2024-11-26
Optique et photonique — Fonction de transfert optique —
Voting terminates on:
Principes et procédures de mesure
2025-01-21
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 172/SC 1
Optics and photonics — Optical
Secretariat: DIN
transfer function — Principles and
Voting begins on:
procedures of measurement
Optique et photonique — Fonction de transfert optique —
Voting terminates on:
Principes et procédures de mesure
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2024
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ii
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Measuring equipment and environment . 1
4.1 General aspects .1
4.1.1 Measuring conditions .1
4.1.2 Uncertainty of measurement .1
4.2 Environment .2
4.2.1 General .2
4.2.2 Temperature and humidity control .2
4.2.3 Vibration .2
4.2.4 Electromagnetic disturbances .2
4.3 Measuring equipment .2
4.3.1 Optical mounts .2
4.3.2 Defocusing tolerance .3
4.3.3 Provision of measuring scales .3
4.4 System components .3
4.4.1 General .3
4.4.2 Optical benches . .3
4.4.3 Test target unit .4
4.4.4 Mounting of the test specimen .9
4.4.5 Image evaluation system .9
4.4.6 Auxiliary imaging systems .10
5 Measurement procedures .10
5.1 General .10
5.2 Setting the measuring conditions .10
5.2.1 General .10
5.2.2 Environmental conditions .10
5.2.3 Spectral characteristics .11
5.2.4 Angular distribution and aperture considerations .11
5.2.5 Image scale and magnification .11
5.2.6 Focusing .11
5.3 Additional considerations of measurement. 12
5.3.1 General . 12
5.3.2 Linear range of test specimen . 12
5.3.3 Isoplanatic region . 12
5.3.4 Fixed pattern noise . 12
5.3.5 Analysed area . 12
5.3.6 Background radiation . 12
5.3.7 Veiling glare . 13
5.3.8 Parallelism of image and analysing element . 13
5.3.9 Signal-to-noise ratio . 13
5.4 Particular measuring conditions .14
5.4.1 Azimuths.14
5.4.2 Selection of image heights or field angles .14
5.4.3 Reference angles of the test specimen .14
6 Corrections to measured data . 14
6.1 Normalization.14
6.2 Correction of the frequency scale .14
6.3 Correction of the measured modulation . 15
6.4 Auxiliary imaging systems . 15

iii
7 Presentation of OTF data .15
7.1 General . 15
7.2 Statement of identification and measuring conditions . 15
7.3 Graphical presentation of OTF data .16
7.4 Numerical presentation .17
8 Uncertainty checks . 17
Annex A (informative) Examples of the presentation of OTF data . 19
Bibliography .24

iv
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). T
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ISO /TC 172/SC 1/WG 1
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Secretariat: DIN
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Date: 2024-11-02xx
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Optics and photonics — Optical transfer function — Principles and
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procedures of measurement
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Optique et photonique — Fonction de transfert optique — Principes et procédures de mesure
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ISO/DIS FDIS 9335:2024(Een) Formatted: Font: 11 pt, Bold
Formatted: Font: 11 pt, Bold
Formatted: Font: 11 pt, Bold
© ISO 2024
Formatted: HeaderCentered, Space After: 0 pt, Line
spacing: single
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, Commented [eXtyles1]: The reference "ISO 2024" is to a
withdrawn standard
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either
ISO at the address below or ISO’s member body in the country of the requester.
Commented [eXtyles2]: The reference "ISO 2024" is to a
withdrawn standard
ISO copyright office
Formatted: Default Paragraph Font
CP 401 • Ch. de Blandonnet 8
Formatted: Default Paragraph Font
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
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EmailE-mail: [e-mail]
Before: 0 pt, No page break before, Adjust space
Website: www.iso.orgwww.iso.org
between Latin and Asian text, Adjust space between
Asian text and numbers
Published in Switzerland
Formatted: French (France)
Formatted: French (France)
Formatted: French (France)
Formatted: Font: 10 pt
Formatted: Font: 10 pt
Formatted: Font: 10 pt
Formatted: Font: 11 pt
Formatted: FooterPageRomanNumber, Space After: 0
pt, Line spacing: single
ii © ISO 2024 – All rights reserved
ii
Formatted: Font: 11 pt, Bold
Formatted: Font: Bold
Formatted: HeaderCentered, Left
Contents
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
Foreword . vi
Introduction . vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Measuring equipment and environment . 1
4.1 General aspects . 1
4.2 Environment . 2
4.3 Measuring equipment . 3
4.4 System components . 3
5 Measurement procedures . 10
5.1 General. 10
5.2 Setting the measuring conditions . 11
5.3 Additional considerations of measurement. 12
5.4 Particular measuring conditions . 14
6 Corrections to measured data . 15
6.1 Normalization . 15
6.2 Correction of the frequency scale . 15
6.3 Correction of the measured modulation . 15
6.4 Auxiliary imaging systems . 16
7 Presentation of OTF data . 16
7.1 General. 16
7.2 Statement of identification and measuring conditions . 16
7.3 Graphical presentation of OTF data . 17
7.4 Numerical presentation . 18
8 Uncertainty checks . 18
Annex A (informative) Examples of the presentation of OTF data . 20
Bibliography . 25

Forewod . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
Formatted: Font: 10 pt
4 Measuring equipment and environment . 1
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4.1 General aspects . 1
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4.1.1 Measuring conditions . 1
4.1.2 Uncertainty of measurement . 1
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4.2 Environment . 2
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iii
ISO/DIS FDIS 9335:2024(Een) Formatted: Font: 11 pt, Bold
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4.2.1 General. 2
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4.2.2 Temperature and humidity control . 2
spacing: single
4.2.3 Vibration . 2
4.2.4 Electromagnetic disturbances . 2
4.3 Measuring equipment . 2
4.3.1 Optical mounts . 2
4.3.2 Defocusing tolerance . 2
4.3.3 Provision of measuring scales . 3
4.4 System components . 3
4.4.1 General. 3
4.4.2 Optical benches. 3
4.4.3 Test target unit . 4
4.4.4 Mounting of the test specimen . 8
4.4.5 Image evaluation system . 8
4.4.6 Auxiliary imaging systems . 9
5 Measurement procedures . 9
5.1 General. 9
5.2 Setting the measuring conditions . 10
5.2.1 General. 10
5.2.2 Environmental conditions . 10
5.2.3 Spectral characteristics . 10
5.2.4 Angular distribution and aperture considerations . 10
5.2.5 Image scale and magnification . 10
5.2.6 Focusing. 10
5.3 Additional considerations of measurement. 11
5.3.1 General. 11
5.3.2 Linear range of test specimen . 11
5.3.3 Isoplanatic region . 11
5.3.4 Fixed pattern noise. 11
5.3.5 Analysed area . 11
5.3.6 Background radiation .
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