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Frequency-division-multiplexed OCDR for low receiver bandwidth quasi-distributed ultrasonic sensing with enhanced
Optics Letters
|November 4, 2025
Summary
This study demonstrates a new method for ultrasonic detection using optical coherence domain reflectometry (OCDR) and frequency-division multiplexing. This approach enables cost-effective, large-scale ultrasonic sensor arrays for industrial non-destructive testing.
Area of Science:
- Non-destructive testing
- Optical sensing technologies
- Industrial manufacturing applications
Background:
- Ultrasonic detection is crucial for non-destructive testing in manufacturing.
- Quasi-distributed acoustic sensing (QDAS) offers potential for large-scale ultrasonic sensor arrays.
- Existing QDAS systems face challenges in receiver bandwidth requirements.
Purpose of the Study:
- To implement an optical coherence domain reflectometry (OCDR) system for ultrasonic pulse detection.
- To reduce receiver bandwidth requirements for QDAS systems.
- To enhance the feasibility of QDAS for ultrasonic flaw detection and imaging.
Main Methods:
- Utilized an O বিলম্বDR system with frequency-division multiplexing.
- Employed an optical fiber with weak reflectors for ultrasonic pulse detection.
- Demonstrated detection of 1 MHz ultrasonic pulses over 2 km fiber.
Main Results:
- Achieved ultrasonic pulse detection with a compressed receiver bandwidth of several MHz.
- Successfully detected 1 MHz ultrasonic pulses over a 2 km optical fiber.
- The O বিলম্বDR system significantly reduced receiver bandwidth needs.
Conclusions:
- The proposed O বিলম্বDR system enhances the feasibility of QDAS for ultrasonic applications.
- This technology offers a cost-effective solution for large-scale ultrasonic sensor arrays.
- The system has significant implications for flaw detection and imaging in industrial settings.
