Piezoelectric Tuning Fork Acoustic Emission Sensor Test
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Solution Overview
Problem
Existing methods for testing acoustic emission sensors lack reproducibility and practical implementation, leading to potential improper assessment of their functionality and acoustic coupling to process control devices.
Innovation Solution
A system comprising a piezoelectric tuning fork acoustically coupled to a process control device, which produces a measurable acoustic signal that is compared to a reference signal by an acoustic emission sensor, using a controller to determine the operational condition of the sensor and alert operators to any deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pencil lead break test or piezoelectric sensor reciprocity test is used, then the acoustic emission sensor can be tested, but the test lacks reproducibility and practical implementation reliability
Solution Approach 1:
The patent changes the test parameters by using a piezoelectric tuning fork with known acoustic characteristics instead of subjective pencil lead breaking or unstandardized piezoelectric reciprocity tests. The tuning fork produces consistent acoustic signals at specific frequencies, enabling objective measurement and reproduction of test results.
Solution Approach 2:
The patent creates a standardized test model by using a piezoelectric tuning fork that replicates known acoustic characteristics. This copying approach allows the same test to be performed multiple times with identical results, establishing reproducibility and reliability in sensor functionality assessment.
2Ease of operation
If existing test methods are used, then the sensor can be tested, but the operator may improperly assess the sensor functionality
Solution Approach 1:
The patent implements feedback by comparing the acoustic signal measured by the sensor against the known acoustic characteristics of the piezoelectric tuning fork. This feedback mechanism provides objective criteria for assessing sensor functionality, preventing operator error and ensuring precise assessment results.
Solution Approach 2:
The patent replaces subjective mechanical testing (pencil breaking) with a standardized acoustic signal generation system. The piezoelectric tuning fork generates controlled acoustic waves that can be objectively measured and compared, eliminating the imprecision and subjectivity inherent in manual mechanical tests.
3Reliability
If the acoustic emission sensor is used to monitor process control devices, then operational status can be detected, but the sensor must be properly acoustically coupled which is difficult to verify
Solution Approach 1:
The patent performs preliminary testing of the acoustic emission sensor using a piezoelectric tuning fork before the sensor is deployed for actual process monitoring. This preliminary action verifies that the sensor is properly acoustically coupled and functioning correctly, ensuring reliable operational status detection in subsequent applications.
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
This approach provides a reliable and reproducible method to assess the functionality and acoustic coupling of acoustic emission sensors, ensuring precise measurements and identifying any operational issues or malfunctions.
Implementation Method 1
a piezoelectric tuning fork coupled to the surface of the process control and acoustically coupled to the acoustic emission sensor, the piezoelectric tuning fork being configured to produce an acoustic signal
Implementation Method 2
an acoustic emission sensor coupled to a surface of the process control device, where the acoustic emission sensor is adapted to detect an operational condition of the process control device
Data Source
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AI summary
Methods and apparatus to test acoustic emission sensors are disclosed herein. An example apparatus includes a process control device, an acoustic emission sensor coupled to the process control device, where the acoustic emission sensor detects an operational condition of the process control device, and a piezoelectric tuning fork acoustically coupled to the acoustic emission sensor to test the operational condition of the acoustic emission sensor.