Acoustic Emission Sensor Verification Using a Standardized Test Signal
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Solution Overview
Problem
Existing methods for verifying the operation of acoustic emission sensors lack reproducibility and practicality, often leading to improper assessment of their functionality.
Innovation Solution
An acoustic test apparatus and method utilizing an acoustic source, such as a DC motor or haptic device, to generate signals measured by the sensor, compared to a baseline to determine operational status, ensuring accurate characterization and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pencil lead break test or piezoelectric sensor reciprocity mode is used to verify acoustic emission sensor functionality, then the sensor can be tested, but the test lacks reproducibility and can lead to improper assessment of sensor functionality
Solution Approach 1:
The patent applies preliminary action by generating acoustic signals before sensor deployment using a standardized acoustic source (pneumatic actuator breaking material seals). This pre-generated signal serves as a reference baseline that enables consistent, reproducible verification of sensor functionality throughout its operational life, eliminating the unreproducible nature of ad-hoc tests like pencil lead breaks.
Solution Approach 2:
The patent utilizes parameter changes by monitoring variations in acoustic signal characteristics (amplitude, frequency, waveform) generated by the standardized pneumatic actuator. By comparing these controlled parameter changes against baseline measurements, the system achieves reproducible and accurate assessment of sensor functionality without relying on inconsistent manual tests.
2Reliability
If manual pencil lead break test is performed by operator or technician, then sensor functionality can be checked, but the test is time-consuming and subject to human error in assessment
Solution Approach 1:
The patent implements self-service by enabling the acoustic emission sensor to perform its own functionality verification through automated comparison of received acoustic signals against stored baseline characteristics. This self-diagnostic capability eliminates the need for manual operator intervention, reducing both time consumption and human error in assessment while maintaining high reliability.
Solution Approach 2:
The system applies feedback by continuously comparing acoustic signals received from the standardized pneumatic actuator against baseline measurements and automatically determining sensor functionality status. This automated feedback loop provides immediate, accurate assessment results without requiring manual intervention, thereby reducing test execution time and eliminating human assessment errors.
3Measurement precision
If standardized acoustic source with pneumatic actuator is used to generate test signals, then test reproducibility is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the pneumatic actuator to perform multiple functions: it serves as both the test signal generator and a representative load simulating actual operational conditions. This multi-functionality reduces the need for separate specialized test equipment, thereby improving signal consistency while limiting the increase in overall device complexity.
Solution Approach 2:
The patent uses an intermediary approach by introducing a standardized pneumatic actuator as a mediator between the acoustic emission sensor and the test environment. This intermediary device provides consistent, controllable acoustic signals that improve measurement precision while maintaining a relatively simple apparatus structure through its straightforward pneumatic mechanism.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Provides a reliable and cost-effective means to assess the operational condition of acoustic emission sensors, reducing errors in functionality assessment and ensuring precise data collection.
Implementation Method 1
an acoustic source (e.g., a DC motor, an asymmetric motor, a piezoelectric device, a resonator, a tuning fork, etc.) and/or an appropriate haptic device to generate an acoustic signal that is measured at the acoustic emissions sensor
Implementation Method 2
The example acoustic emission sensor 102 includes a housing 104 and a piezoelectric element 106 disposed in and/or at least partially surrounded by the housing 104
Data Source
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AI summary
Methods and apparatus verify operation of acoustic emission sensors are disclosed. A disclosed example apparatus includes an acoustic source acoustically coupled to a device, where the acoustic source is to generate an acoustic signal, and a processor to determine an operational condition of an acoustic emission sensor associated with the device based on measuring the generated acoustic signal at the acoustic emission sensor.