ISO 18251-1:2017

Non-destructive testing — Infrared thermography — Part 1: Characteristics of system and equipment

ISO 18251-1:2017 describes the main components, and their characteristics, constituting an infrared (IR) imaging system and related equipment used in non-destructive testing (NDT). It also aims to assist the user in the selection of an appropriate system for a particular measurement task. The following items are specified: - objective lens; - detector; - image processor; - display; - thermal stimulation source; - accessories.

Essais non destructifs — Thermographie infrarouge — Partie 1: Caractéristiques du système et des équipements

General Information

• Status: Published
• Publication Date: 12-Jan-2017
• ICS: 19.100 - Non-destructive testing
• Technical Committee: ISO/TC 135/SC 8 - Thermographic testing
• Drafting Committee: ISO/TC 135/SC 8/WG 3 - NDT-IR-System and equipment
• Current Stage: 9060 - Close of review
• Completion Date: 02-Sep-2027

Relations

• Consolidated By: ISO 178:2019 - Plastics — Determination of flexural properties
• Effective Date: 06-Jun-2022

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 18251-1
First edition
2017-02
Non-destructive testing — Infrared
thermography —
Part 1:
Characteristics of system and
equipment
Essais non destructifs — Thermographie infrarouge —
Partie 1: Caractéristiques du système et des équipements
Reference number
©
ISO 2017
© ISO 2017, Published in Switzerland
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ii © ISO 2017 – All rights reserved

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 IR system setup . 1
5 Objective lens . 2
5.1 General . 2
5.2 Spectral response. 2
5.3 Focal length (mm) . 2
5.4 Aperture f-number . 2
5.5 Interchangeable object lenses . 3
6 Detector . 3
6.1 General . 3
6.2 Detector types . 3
6.3 Detector arrays . 3
6.4 Scanning systems . 3
6.5 Working wavelength range . 3
6.6 Number of pixels . 4
6.7 Bad/dead pixel . 4
6.8 Detector operability . 4
6.9 Thermal time constant . 4
6.10 Integration time . 4
6.11 Temperature range . 4
7 Image processor . 4
7.1 General . 4
7.2 Image acquisition . 4
7.2.1 Timing acquisition . 4
7.2.2 Trigger acquisition . 5
7.2.3 Image freeze . 5
7.3 Image display . 5
7.4 Image analysis . 5
7.5 Image processing . 5
7.5.1 General. 5
7.5.2 Bad/dead pixel replacement . 5
7.5.3 Non-uniformity correction . 5
7.5.4 Image enhancement . 5
7.5.5 Filtering . 6
7.5.6 Time correlated processing method . 6
7.5.7 Visible-infrared image fusion. 6
7.6 Image recording . 6
8 Thermal stimulation source . 6
8.1 General . 6
8.2 Optical radiation devices . 6
8.3 Convective excitation devices . 6
8.4 Electromagnetic induction devices . 7
8.5 Mechanical excitation devices . 7
8.6 Advantages and drawbacks of thermal stimulation sources . 7
9 Integrated characteristics and functions of infrared systems and equipment.7
9.1 Integrated performance parameters. 7
9.1.1 Noise equivalent temperature difference (NETD) . 7
9.1.2 Minimum resolvable temperature difference (MRTD) . 8
9.1.3 Minimum detectable temperature difference (MDTD) . 8
9.1.4 Field of view (FOV) . 8
9.1.5 Instantaneous field of view (IFOV) . 8
9.1.6 Minimum working distance . 8
9.1.7 Maximum temperature measurement range . 8
9.1.8 Temperature measurement uniformity . 8
9.1.9 Operating temperature range . 9
9.2 Integrated functions . 9
9.2.1 Digital input/output interface . 9
9.2.2 Data transfer interface . 9
9.2.3 Video output interface . 9
10 Accessories . 9
10.1 Infrared mirror . 9
10.2 Attenuation filter . 9
10.3 Spectral filters . 9
10.4 Tripod . 9
10.5 Reference blocks . 9
Bibliography .10
iv © ISO 2017 – All rights reserved

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Stand
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