IEC 61757-2-2-2016 PDF

Full title and description

Fibre optic sensors - Part 2-2: Temperature measurement - Distributed sensing. This International Standard specifies detailed performance parameters and test procedures for distributed temperature sensing (DTS) systems based on Raman, Brillouin and Rayleigh scattering and defines a general test setup and reporting format for DTS instruments.

Abstract

IEC 61757-2-2:2016 defines the most important performance parameters for fibre‑optic distributed temperature sensing (DTS) and the procedures to determine them. It covers Raman- and Rayleigh-based measurements (single-ended configuration) and Brillouin-based measurements (single-ended or loop/BOTDA configurations), provides a general test configuration, and includes annexes with a blank performance parameter table and guidance on optional point-defect testing.

General information

• Status: International Standard (published, current edition).
• Publication date: 12 May 2016.
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 33.180.99 (Fibre optics).
• Edition / version: Edition 1.0 (2016).
• Number of pages: 31 pages (IEC publication).

Scope

This part of IEC 61757 specifies performance parameters, definitions and test procedures for distributed temperature measurement using fibre‑optic sensors (DTS). It includes methods based on Raman, Brillouin and Rayleigh scattering, identifies allowable measurement configurations (single‑ended and loop/BOTDA where applicable), and prescribes the general test setup and documentation required to report instrument performance. The publication is intended to be read together with IEC 61757-1 (generic specifications).

Key topics and requirements

• Definitions of DTS performance parameters (temperature measurement error, spatial resolution, temperature repeatability, spatial temperature uncertainty, environmental stability, etc.).
• Procedures for determining each performance parameter, including test conditions and data‑processing steps.
• Specifications for permitted measurement configurations: Raman and Rayleigh used in single‑ended configurations; Brillouin usable in single‑ended or loop (BOTDA) configurations.
• A general test setup (clause 4) that supports gathering all required parameters and guidance on splicing, reference baths, and fibre layout.
• Annex A: blank performance parameter table for reporting; Annex B: guidance for optional point‑defect effect determination.

Typical use and users

Primary users are DTS instrument manufacturers, fibre‑optic cable suppliers, test laboratories, certification bodies and research organisations. Typical applications where IEC 61757-2-2 guidance is applied include continuous temperature monitoring of underground and subsea power cables, pipeline leak and integrity monitoring, fire and linear heat detection, and environmental/hydrological measurements (streambed, borehole and soil temperature profiling). The standard is used to specify, test and compare DTS instrument performance for these operational deployments.

Related standards

IEC 61757-2-2 is part of the IEC 61757 series on fibre‑optic sensors and should be read in conjunction with IEC 61757-1 (generic specifications). It has been adopted in regional/national collections (for example EN 61757-2-2:2017) and is managed by TC 86/SC 86C (fibre optic systems, sensing and active devices).

Keywords

Distributed temperature sensing, DTS, fibre optic sensors, Raman scattering, Brillouin scattering, Rayleigh scattering, spatial resolution, temperature measurement error, test procedures, IEC 61757.

FAQ

Q: What is this standard?

A: IEC 61757-2-2:2016 is an international standard that defines performance parameters and test procedures for fibre‑optic distributed temperature sensing (DTS) systems.

Q: What does it cover?

A: It covers measurement principles based on Raman, Brillouin and Rayleigh scattering, the permitted measurement configurations (single‑ended and loop/BOTDA), detailed test procedures for key performance parameters, a general test setup, and reporting templates (annexes).

Q: Who typically uses it?

A: Instrument and cable manufacturers, independent test labs, certification bodies, system integrators and researchers working on DTS applications such as power‑cable monitoring, pipeline and LNG monitoring, fire detection and environmental/hydrological studies.

Q: Is it current or superseded?

A: The published edition (Edition 1.0) dates from 12 May 2016 and remains the published International Standard. A next‑edition project (IEC 61757-2-2 ED2) was initiated (project activity noted in late 2025), so users should check for a formal new edition or revision status before assuming long‑term stability.

Q: Is it part of a series?

A: Yes — IEC 61757 is a series on fibre‑optic sensors; Part 2-2 is the temperature/distributed sensing section and is intended to be read together with IEC 61757-1 (generic specifications) and other parts of the series as applicable.

Q: What are the key keywords?

A: Distributed temperature sensing, DTS, Raman, Brillouin, Rayleigh, spatial resolution, temperature error, fibre‑optic sensors, test procedures.