研究目的
To study the application of Fiber Bragg Grating Acoustic Emission Sensors in Thin Polymer-Bonded Explosives, focusing on the sensing principle, directionality, and improving the accuracy of location experiments.
研究成果
The study demonstrates the directionality of FBG AE sensors and proposes a time coefficient location method that significantly improves the accuracy of locating AE sources on thin PBX materials compared to traditional methods.
研究不足
The FBG AE sensors have a threshold voltage of 40 dB, limiting detection to signals above this amplitude. The time coefficient location method is currently limited to surface cracks near the center of thin PBX materials.
1：Experimental Design and Method Selection:
The study involves the use of FBG AE sensors to detect AE waves on thin PBX materials, introducing a time coefficient location method to correct AE time detection.
2：Sample Selection and Data Sources:
Thin PBX materials are used as samples, with AE signals simulated using the Hsu-Nielsen broken lead method.
3：List of Experimental Equipment and Materials:
Includes FBG AE sensors, tunable narrowband laser, photodetectors, preamplifiers, and acquisition systems.
4：Experimental Procedures and Operational Workflow:
FBG AE sensors are glued onto PBX surfaces, and AE signals are generated and detected to study sensor directionality and location accuracy.
5：Data Analysis Methods:
Data is analyzed using MATLAB software for curve fitting and least squares method to calculate AE source locations.
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Tunable narrowband laser
TSL-510
Santec Corporation
Used to demodulate the AE signal in the FBG AE sensor system.
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Temperature demodulator system
FBGA-S-1525-1605-FA
BaySpec Corporation
Measures temperature changes for the FBG AE sensors.
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Photodetector
2117
New Focus Company
Detects the reflected light from the FBG AE sensor.
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Preamplifier
2/4/6
Physical Acoustics Corporation
Amplifies the signal detected by the photodetector.
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Acquisition device
Express 8
Physical Acoustics Corporation
Acquires and processes the amplified signals.
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Computer
IPC-610L
ADVANTECH Company
Processes data and adjusts the tunable narrowband laser output.
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ASE-CL-M2
ASE-CL-M2
Top Photonics Corporation
Part of the temperature demodulator system.
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