IEC 61757-1-1-2020 PDF

Full title and description

Fibre optic sensors - Part 1-1: Strain measurement - Strain sensors based on fibre Bragg gratings. This document specifies detailed requirements, performance parameters and test methods for strain sensors that use one or more fibre Bragg gratings (FBG) as the sensing element, and for the associated interrogation/readout instruments.

Abstract

IEC 61757-1-1:2020 (Ed. 2.0) defines the most important characteristics and measurement procedures for FBG-based strain sensors, covering both static and dynamic strain measurements over a range of frequencies. The standard provides test methods to determine sensor and interrogation unit performance and includes a blank (detail) specification template in an informative annex to support product specification. It updates cited references and clarifies several definitions and test specifications compared with the previous edition.

General information

• Status: Published (International Standard).
• Publication date: 27 March 2020.
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 33.180.99 (Other fibre optic equipment / Fibre optic sensors).
• Edition / version: Edition 2.0 (2020).
• Number of pages: 108 pages (official IEC publication metadata).

Scope

Specifies detailed subject-matter requirements for FBG-based strain sensors: definitions, sensor characteristics (wavelength response, reflectivity, signal-to-noise, side-lobes, polarization effects), required test procedures for determining metrological and operational parameters, and minimum performance parameters for the interrogation/readout instrumentation. The scope explicitly applies to both static and dynamic strain measurement and is to be used together with the generic IEC 61757 series framework for fibre optic sensors.

Key topics and requirements

• Terminology and definitions specific to FBG strain sensors (Bragg wavelength, side-lobes, spectral metrics).
• Sensor performance parameters: sensitivity, linearity, measurement range, resolution, hysteresis and dynamic response.
• Optical characteristics: reflectance/transmittance, spectral width, polarization sensitivity and signal-to-noise requirements.
• Test methods to determine static and dynamic strain response and to characterise interrogation units/readout electronics.
• Environmental and durability considerations relevant to strain sensing (where applicable) and reporting requirements.
• Provision of a blank detail specification template (informative annex) to facilitate supplier–buyer agreements.

Typical use and users

Intended for manufacturers of FBG strain sensors and interrogation instruments, test laboratories, system integrators and end-users who specify, procure or verify strain-sensing products — for example in structural health monitoring, civil and mechanical engineering, aerospace, energy and research applications. The standard supports clear product specification, testing and conformity assessment within the IEC 61757 series framework.

Related standards

Part of the IEC 61757 series (generic specification IEC 61757 and other parts addressing temperature, distributed sensing, acoustic/distributed sensing, pressure and additional measurands). Notable related parts and documents include the IEC 61757 generic specification and several measurand-specific parts (examples: IEC 61757-2-1 for FBG temperature sensors, IEC 61757-3-2 for acoustic/distributed sensing); national and regional adoptions exist as EN/BS/UNE/CZN variants. A further revision (third edition) for IEC 61757-1-1 has been progressed as a project in IEC technical committee records (ED3 in development at time of record).

Keywords

fibre optic sensors; fibre Bragg grating; FBG; strain measurement; interrogation unit; sensor test methods; IEC 61757; metrological parameters; static strain; dynamic strain.

FAQ

Q: What is this standard?

A: IEC 61757-1-1:2020 is an international standard that defines detailed specifications and test methods for strain sensors that use fibre Bragg gratings (FBGs) as the sensing element, and for the corresponding readout/interrogation equipment.

Q: What does it cover?

A: It covers sensor definitions, optical and metrological characteristics (wavelength, reflectance, SNR, side-lobes, polarization effects), test procedures for static and dynamic strain measurements, required performance parameters for interrogation units, and includes an informative blank detail specification to help produce product specifications.

Q: Who typically uses it?

A: Manufacturers, test laboratories, system integrators and engineers in applications such as structural health monitoring, civil and mechanical engineering, aerospace, energy industries and research organizations — anyone who specifies, produces or verifies FBG strain sensors and their readout systems.

Q: Is it current or superseded?

A: The 2020 edition (Ed. 2.0) is the published, normative edition for IEC 61757-1-1. IEC metadata lists the 2020 edition as the active published edition; separately, IEC technical committee records show work toward a further revision (ED3) in the IEC project system (an ED3 project has been recorded). Users should check national/regional adoption notices or the IEC webstore for the absolute latest status before relying on the standard for procurement or compliance.

Q: Is it part of a series?

A: Yes — IEC 61757 is a multi-part series providing a generic specification (IEC 61757) and multiple parts that address specific measurands and sensor technologies; IEC 61757-1-1:2020 is the FBG-based strain-sensor part of that series.

Q: What are the key keywords?

A: fibre Bragg grating (FBG), strain sensor, interrogation unit, test methods, spectral characteristics, IEC 61757, metrological parameters.