ASTM E976-15(2021) PDF
Standard Guide for Determining the Reproducibility of Acoustic Emission Sensor Response
Standard Guide for Determining the Reproducibility of Acoustic Emission Sensor Response
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 7
- Дата публикации:
- 1 ноября 2021 г.
- Издание:
- E976
- ICS:
- 17.140.01
SIGNIFICANCE AND USE 3.1 Acoustic emission data is affected by several characteristics of the instrumentation. The most obvious of these is the system sensitivity. Of all the parameters and components contributing to the sensitivity, the acoustic emission sensor is the one most subject to variation. This variation can be a result of damage or aging, or there can be variations between nominally identical sensors. To detect such variations, it is desirable to have a method for measuring the response of a sensor to an acoustic wave. Specific purposes for checking sensors include: (1) checking the stability of its response with time; (2) checking the sensor for possible damage after accident or abuse; (3) comparing a number of sensors for use in a multichannel system to ensure that their responses are adequately matched; and (4) checking the response after thermal cycling or exposure to a hostile environment. It is very important that the sensor characteristics be always measured with the same sensor cable length and impedance as well as the same preamplifier or equivalent. This guide presents several procedures for measuring sensor response. Some of these procedures require a minimum of special equipment. 3.2 It is not the intent of this guide to evaluate AE system performance. Refer to Practice E750 for characterizing acoustic instrumentation and refer to Guide E2374 for AE system performance verification. 3.3 The procedures given in this guide are designed to measure the response of an acoustic emission sensor to an arbitrary but repeatable acoustic wave. These procedures in no way constitute a calibration of the sensor. The absolute calibration of a sensor requires a complete knowledge of the characteristics of the acoustic wave exciting the sensor or a previously calibrated reference sensor. In either case, such a calibration is beyond the scope of this guide. 3.4 The fundamental requirement for comparing sensor responses is a source of repeatable acoustic waves. The character... SCOPE 1.1 This guide defines simple economical procedures for testing or comparing the performance of acoustic emission sensors. These procedures allow the user to check for degradation of a sensor or to select sets of sensors with nearly identical performances. The procedures are not capable of providing an absolute calibration of the sensor nor do they assure transferability of data sets between organizations. 1.2 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Abstract
Overview
ASTM E976-15(2021), titled "Standard Guide for Determining the Reproducibility of Acoustic Emission Sensor Response," provides a reliable framework for comparing and testing the performance of acoustic emission (AE) sensors. Developed by ASTM International, this guide is crucial for nondestructive testing where the stability and reliability of AE sensor measurements are essential. The standard defines straightforward and cost-effective procedures that help users detect degradation, match sensor sets for multichannel systems, and identify physical or operational inconsistencies in acoustic emission sensors over time.
By following this guide, users can efficiently verify sensor performance under consistent testing conditions, ensuring accurate AE data and supporting effective decision-making in quality control, process monitoring, and system diagnostics.
Key Topics
- Measurement of Sensor Response: Guidance on procedures for measuring AE sensor response to repeatable acoustic waves, without claiming absolute calibration.
- Stability Verification: Methods to monitor how sensor characteristics change over time, after incidents, or due to environmental stress (e.g., thermal cycling).
- Comparison of Sensors: Approaches for comparing nominally identical AE sensors to ensure well-matched responses in multi-channel setups.
- Testing Procedures: Use of standard test blocks or rods, recommended signal sources (ultrasonic transducers, gas jets, pencil lead breaks), and configuration guidelines for consistent and repeatable testing.
- Critical Setup Parameters: Emphasis on maintaining the same sensor cable length, impedance, and preamplifier configuration during tests to ensure valid comparisons.
- Measurement Equipment: Recommendations for preamplifiers, waveform acquisition instruments, oscilloscopes, spectrum analyzers, and voltmeters.
Applications
The ASTM E976-15(2021) standard is widely applicable in industries and environments where the integrity of acoustic emission data is critical:
- Nondestructive Testing (NDT): Regular checks and validation of AE sensors in structural health monitoring, pipeline testing, and pressure vessel inspection.
- Sensor Fleet Management: Selection and grouping of AE sensors for multi-channel systems to assure uniform performance across all channels.
- Quality Control: Detecting early sensor degradation to maintain reliable monitoring in manufacturing and construction.
- Post-Event Inspection: Rapid assessment of sensors following incidents such as mechanical impacts or exposure to extreme environments.
- Research and Development: Establishing baseline response and monitoring changes in prototype or experimental AE sensors.
By implementing this standard, organizations can improve the consistency and repeatability of AE measurements, ensure integrity in test results, and reduce the risk of false readings caused by sensor drift or malfunction.
Related Standards
For comprehensive coverage of AE sensor and system performance, the following ASTM standards are closely related:
- ASTM E750: Practice for Characterizing Acoustic Emission Instrumentation - guidelines for characterizing overall AE systems.
- ASTM E2075: Practice for Verifying the Consistency of AE-Sensor Response Using an Acrylic Rod - focused methods for AE sensor consistency checks.
- ASTM E2374: Guide for Acoustic Emission System Performance Verification - procedures to verify the performance of complete AE systems.
These documents complement ASTM E976-15(2021) and help ensure a robust acoustic emission testing program that meets international best practices.
Keywords: ASTM E976-15(2021), acoustic emission sensor, reproducibility, sensor response, nondestructive testing, quality control, AE system, sensor validation, sensor performance, standard guide, ASTM standard
Технические детали
- Технический комитет
- E07 - Nondestructive Testing
- SKU
- ASTM E976-15(2021)
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