PMMA Rod Sensor Bench for Acoustic Emission Sensitivity Screening
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Solution Overview
Problem
Existing acoustic emission sensor calibration methods are complex, costly, and lack consistency testing, leading to inaccurate detection results due to sensitivity variations among sensors, especially in harsh environments.
Innovation Solution
A simplified apparatus and method using a PMMA rod test bench with a signal generator and acoustic emission instrument to test sensitivity consistency of multiple sensors, eliminating the need for reference sensors and complex calculations, and ensuring consistent sensor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional calibration methods using capillary glass tubes and standard capacitive sensors are used, then calibration can be performed, but the apparatus becomes complex and costly
Solution Approach 1:
The patent replaces expensive, complex standard capacitive sensors and capillary glass tubes with inexpensive aluminum blocks and simple impact hammers. The aluminum blocks serve as disposable test specimens that can be easily replaced, eliminating the need for costly reference sensors while maintaining calibration reliability.
Solution Approach 2:
The patent substitutes the complex mechanical capillary tube breaking system with a simple impact hammer mechanism. The hammer delivers controlled impacts to the aluminum block, generating acoustic emission signals without requiring the fragile capillary glass tube apparatus, thereby simplifying the mechanical system while maintaining calibration effectiveness.
2Reliability
If conventional calibration methods are used, then sensor calibration can be performed, but the test block becomes large and heavy
Solution Approach 1:
The patent changes the material parameter from steel (conventional test block) to aluminum (new test block). Aluminum has lower density and weight while maintaining suitable acoustic emission properties for calibration. This parameter change allows the test block to be much lighter and more portable while preserving calibration accuracy.
3Reliability
If conventional calibration methods are used, then sensor calibration can be performed, but the test procedure becomes time-consuming and complex
Solution Approach 1:
The patent enables users to perform calibration themselves using simple aluminum blocks and impact hammers, without requiring specialized reference sensors or complex equipment. This self-service approach eliminates the need to send sensors to metrology institutes, significantly reducing calibration time and making the process accessible to general users while maintaining validity.
4Measurement precision
If conventional calibration methods are used, then single sensor sensitivity can be tested, but sensitivity consistency among multiple sensors cannot be evaluated
Solution Approach 1:
The patent makes the aluminum block test specimen universal for testing multiple sensors. The same aluminum block can be used to calibrate and compare any number of sensors by performing repeated impacts, enabling evaluation of sensitivity consistency across the entire sensor array without requiring different reference standards for each sensor.
5Productivity
If conventional calibration methods are used, then calibration can be performed annually, but sensitivity changes due to wear and environmental factors cannot be detected
Solution Approach 1:
The patent enables preliminary sensitivity consistency testing of the entire sensor array before actual detection tasks. By using the simple aluminum block and impact hammer method, users can quickly verify that all sensors are functioning consistently before deployment, preventing reliability issues from arising during actual detection work.
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
The method provides efficient, low-cost, and reliable sensitivity consistency testing, enabling accurate sensor selection and improving detection efficiency by ensuring uniform sensor response, thus enhancing the reliability and precision of acoustic emission inspections.
Implementation Method 1
Acoustic emission inspection is commonly used for integrity detection and safety evaluation of large-scale structures
Data Source
AI summary
An apparatus and method for testing sensitivity consistency of an acoustic emission sensor are provided. The apparatus uses a cylindrical polymethyl methacrylate (PMMA) rod as a test bench. A clamping seat, a clamping block, and a mounting cylinder are mounted on one end of the test bench in cooperation. Under an action of a pressure spring, an end face of a tested sensor keeps pressure-stable coupling contact with an end face of the test bench. A bracket is mounted on another end face of the test bench, and keeps, together with a fixing seat and the clamping seat, the test bench horizontally placed on a desktop. By adjusting a width and an amplitude of a pulse excitation signal of a signal generator, and according to sensitivity distribution and aggregation between tested sensors, a consistency calculation method is used to screen out tested sensors with first, second, and third sensitivity consistency.