研究目的
To propose and demonstrate a novel pseudo-synchronous method for multi-point detection of ultrasound with fiber Bragg sensors (FBGs) connected in series, overcoming the limitations of conventional wavelength demodulators.
研究成果
The proposed pseudo-synchronous method effectively enables multi-point ultrasound detection with FBGs, showing good prospects for applications in non-destructive testing and structural health monitoring.
研究不足
The method's effectiveness is demonstrated on specific materials (aluminum plate and stainless steel tube), and its applicability to other materials or under different conditions is not explored.
1：Experimental Design and Method Selection:
The study employs a pseudo-synchronous method (PSM) for multi-point ultrasound detection using FBGs connected in series. A tunable laser source is used to scan the wavelength to the steepest slope of each FBG for linear operation.
2：Sample Selection and Data Sources:
Experiments were conducted on an aluminum plate and a stainless steel tube to demonstrate the method's effectiveness.
3：List of Experimental Equipment and Materials:
Equipment includes a tunable laser source, photo-detector, DAQ card, PZT actuator, and FBG series.
4：Experimental Procedures and Operational Workflow:
The tunable laser source scans each FBG's wavelength to detect ultrasound-induced strain changes. The photo-detector output is collected and processed by a DAQ card and PC.
5：Data Analysis Methods:
The study uses Bartlett average period to reduce random noise and achieve high SNR in the detection system.
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