ISO 16823:2025 PDF

Non-destructive testing — Ultrasonic testing — Through-transmission technique

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Title (English):

ISO 16823:2025

Non-destructive testing — Ultrasonic testing — Through-transmission technique

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 12
Publication date:: January 7, 2025
Edition:: ISO IS 16823 edition 2 version 1
ICS:: 19.100

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Description (English):

This document specifies the principles of ultrasonic through-transmission techniques. Through-transmission techniques can be used for: — detection of discontinuities; — determination of sound attenuation. The general principles required for the use of ultrasonic testing of industrial products are described in ISO 16810. The through-transmission technique is used for the testing of flat products, e.g. plates and sheets. Further, it can be used for tests, for example: — where the shape, dimensions or orientation of possible discontinuities are unfavourable for direct reflection; — of materials with high sound attenuation; — on thin test objects.

Technical details

Technical committee: ISO/TC 135/SC 3 - Ultrasonic testing
SKU: ISO 16823:2025

Abstract

Overview

ISO 16823:2025 - "Non‑destructive testing - Ultrasonic testing - Through‑transmission technique" defines the principles and practical requirements for ultrasonic through‑transmission testing of flat products (e.g., plates and sheets). The standard covers use of through‑transmission to detect discontinuities and to determine sound attenuation, and it complements general ultrasonic testing principles given in ISO 16810.

Key topics and technical requirements

Scope and purpose: Detection of discontinuities and determination of attenuation in flat or thin test objects, materials with high attenuation, or cases where direct reflection is unfavourable.
NDT personnel: Personnel requirements reference ISO 16810 for qualification and responsibilities.
Test equipment:
- Instruments must comply with ISO 22232‑1.
- Probes must meet ISO 22232‑2 and be selected based on material, thickness, geometry and expected discontinuity orientation.
- Frequency selection (typically 1 MHz to 10 MHz) balances axial resolution and attenuation; probe size and frequency define near‑field length and beam divergence.
- Considerations include dead zone, damping, and use of focusing probes (improved lateral resolution and SNR).
Coupling media: Water, paste, oil, grease, etc., must be compatible with the test material, stable during verification and testing, and suitable for the operating temperature; transfer corrections are applied if conditions change (see ISO 16811).
Reference and standard blocks: Use ISO 2400 and ISO 7963 standard blocks for equipment setting and verification. Reference blocks should match acoustic properties and surface condition of the test object where possible; otherwise apply transfer corrections (ISO 16811).
Testing principles and techniques: Includes basic setup, scanning, sensitivity setting, evaluation of discontinuities, and methods to determine attenuation (comparative using a reference block or using the test object only).

Practical applications

Abstract

Overview

Key topics and technical requirements

Scope and purpose: Detection of discontinuities and determination of attenuation in flat or thin test objects, materials with high attenuation, or cases where direct reflection is unfavourable.
NDT personnel: Personnel requirements reference ISO 16810 for qualification and responsibilities.
Test equipment:
- Instruments must comply with ISO 22232‑1.
- Probes must meet ISO 22232‑2 and be selected based on material, thickness, geometry and expected discontinuity orientation.
- Frequency selection (typically 1 MHz to 10 MHz) balances axial resolution and attenuation; probe size and frequency define near‑field length and beam divergence.
- Considerations include dead zone, damping, and use of focusing probes (improved lateral resolution and SNR).
Coupling media: Water, paste, oil, grease, etc., must be compatible with the test material, stable during verification and testing, and suitable for the operating temperature; transfer corrections are applied if conditions change (see ISO 16811).
Reference and standard blocks: Use ISO 2400 and ISO 7963 standard blocks for equipment setting and verification. Reference blocks should match acoustic properties and surface condition of the test object where possible; otherwise apply transfer corrections (ISO 16811).
Testing principles and techniques: Includes basic setup, scanning, sensitivity setting, evaluation of discontinuities, and methods to determine attenuation (comparative using a reference block or using the test object only).

ISO 16823:2025 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Practical applications

Abstract

Overview

Key topics and technical requirements

Practical applications

Who uses ISO 16823:2025

Related standards

Related standards

Non-destructive testing — Ultrasonic testing — General principles

Non-destructive testing. Characterization and verification of ultrasonic test equipment. Instruments.

Non-destructive testing. Characterization and verification of ultrasonic test equipment. Probes.

Non-destructive testing. Ultrasonic testing. Sensitivity and range setting.

Non-destructive testing. Ultrasonic testing. Specification for calibration block No. 1

Non-destructive testing. Ultrasonic testing. Specification for calibration block No. 2

Non-destructive testing — Ultrasonic testing — Testing for discontinuities perpendicular to the surface

Non-destructive testing — Ultrasonic testing — Characterization and sizing of discontinuities