GB/T 45391-2025Non-destructive testing instruments - Equipment for eddy current examination - Array probe characteristics and verification (English PDF)
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Issued by
State Administration for Market Regulation, China National Standardization Administration
Level / Type
National · Recommended
Issue date
March 28, 2025
Implementation date
October 1, 2025
Scope
GB/T 45391-2025 (Non-destructive testing instruments - Equipment for eddy current examination - Array probe characteristics and verification) is available as an English-translated PDF.
GB/T 45391-2025 — This document specifies the functional characteristics of eddy current array probes and their connected components and provides measurement and verification methods.
Evaluation of these characteristics allows eddy current array probes to be clearly described and compared. Where necessary, this document recommends acceptance criteria for characteristics.
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Document preview — GB/T 45391-2025
National Standard of the People's Republic of China
- ICS
- 19.100
- Classification
- N 78
Issued by: State Administration for Market Regulation, China National Standardization Administration
Contents
- Preface
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Characteristics of probes and connected components
- 4.1 General characteristics
- 4.1.1 Application
- 4.1.2 Probe Type
- 4.1.3 Connecting components
- 4.1.4 Physical properties
- 4.1.5 Security
- 4.1.6 Environmental conditions
- 4.2 Electrical Characteristics
- 4.3 Features
- 5 Inspection
- 5.1 Verification Level
- 5.2 Features to be verified
- 6 Measurement of electrical and functional characteristics of array probes
- 6.1 Electrical Characteristics
- 6.1.1 General
- 6.1.2 Measurement conditions
- 6.1.3 Coil Element Impedance
- 6.1.4 Impedance of the detection unit
- 6.1.5 Channel Configuration --- Timing
- 6.1.6 Crosstalk
- 6.2 Features
- 6.2.1 General
- 6.2.2 Measurement conditions
- 7 Surface array probe
- 7.1 Reference test block
- 7.2 Probe Scanning
- 7.3 Reference signal --- normalization
- 7.4 Edge effect (measurable in geometric shapes such as metal plates and disks)
- 7.5 Response to Slots
- 7.6 Response to Holes
- 7.7 Coverage Length
- 7.8 Variation of sensitivity between detection units
- 7.9 Minimum slot length for constant probe response
- 7.10 Lift-off Effect
- 7.11 Response of the probe to the groove after lift-off
- 7.12 Effective detection depth of near-surface grooves
- 7.13 Resolution
- 7.14 Failed array element or detection unit
- 8 Coaxial array probe
- 8.1 General Conditions
- 8.2 Reference test block
- 8.3 Reference Signal
- 8.4 Failed Array Element
- 8.5 Probe position mark (mainly used for positioning)
- 8.6 End Effects
- 8.7 Coverage Length
- 8.8 Axial response uniformity
- 8.9 Effect of eccentricity
- 8.10 Influence of Fill Rate
- 8.11 Effective penetration depth
- 8.12 Effective detection depth under cover
- 9 Influence of Connected Components
- Appendix A (Informative) Surface Probe Resolution Simulation
- A.1 Simulation 1
- A.2 Simulation 2
- A.3 Simulation 3
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.
This document is equivalent to ISO 20339:2017 "Performance and verification of array probes for non-destructive testing eddy current testing equipment".
The following minimal editorial changes were made to this document.
--- Change the name of the standard to "Performance and inspection of array probes for non-destructive testing instruments and eddy current testing equipment".
1 Scope
This document specifies the functional characteristics of eddy current array probes and their connected components and provides measurement and verification methods.
Evaluation of these characteristics allows eddy current array probes to be clearly described and compared.
Where necessary, this document recommends acceptance criteria for characteristics.
2 Normative references
The contents of the following documents constitute essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.
ISO 12718 Non-destructive testing - Eddy current testing - Vocabulary lary) Note. GB/T 12604.6-2021 Non-destructive testing terminology Eddy current testing (ISO 12718:2019, IDT) ISO 15548-1 Non-destructive testing Eddy current testing equipment Part 1: Instrument performance and verification (Non-destructivetesting-Note. GB/T 14480.1-2015 Non-destructive testing instruments Eddy current testing equipment Part 1: Instrument performance and verification (ISO 15548-1:2008, IDT) ISO 15548-2:2013 Non-destructive testing Eddy current testing equipment Part 2: Probe performance and verification Note. GB/T 14480.2-2015 Non-destructive testing instruments Eddy current testing equipment Part 2: Probe performance and inspection (ISO 15548-2:2008, IDT)
3 Terms and definitions
For the purpose of this document, the terms and definitions defined in ISO 12718 and the following apply.
Element
A single physical element (such as a coil, giant magnetoresistance, or Hall element) that has a basic function (excitation or reception).
Detection unit pattern A single physical and electronic operating mode consisting of elements operating simultaneously.
Sequencing
The activation sequence of the detection unit.
Threshold
The lowest acceptable sensitivity value specified in the application documentation.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 21 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 12604.6-2021Non-destructive testing - Terminology - Eddy current testing
- GB/T 14480.1-2015Non-destructive testing instruments -- Equipment for eddy current examination -- Part 1: Instrument characteristics and verification
- GB/T 14480.2-2015Non-destructive testing instruments -- Equipment for eddy current examination -- Part 2: Probe characteristics and verification
ISO 12718 · ISO 15548
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Related Standards
GB/T 12604.6-2021 — Non-destructive testing - Terminology - Eddy current testing
GB/T 14480.1-2015 — Non-destructive testing instruments -- Equipment for eddy current examination -- Part 1: Instrument characteristics and verification
GB/T 14480.2-2015 — Non-destructive testing instruments -- Equipment for eddy current examination -- Part 2: Probe characteristics and verification
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