A high spatial resolution distributed raman fiber temperature measurement system and method

By using a picosecond-level narrow-pulse laser and asynchronous equivalent time sampling technology, combined with a high-bandwidth avalanche photodetector and a low-sampling-rate ADC module, the problem of low spatial resolution in traditional Raman fiber optic temperature measurement systems has been solved, achieving high-precision and low-cost temperature measurement results.

CN121702571BActive Publication Date: 2026-07-21JIUZHANG (JINAN) QUANTUM TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JIUZHANG (JINAN) QUANTUM TECHNOLOGY CO LTD
Filing Date
2025-12-25
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Traditional Raman fiber optic temperature measurement systems have low spatial resolution, limited by laser pulse width, weak scattered light intensity, and limitations of the signal acquisition module, making it difficult to achieve higher spatial resolution and reduce costs.

Method used

By employing a picosecond-level narrow-pulse laser, asynchronous equivalent time sampling technology, and a high-bandwidth avalanche photodetector, high spatial resolution is achieved through asynchronous equivalent time sampling technology combined with a low sampling rate ADC module, thereby reducing system complexity and cost.

Benefits of technology

It achieves a high spatial resolution of 10cm, reduces system cost and complexity, and is suitable for high-precision temperature measurement scenarios.

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Abstract

The application relates to the technical field of optical fiber sensing, and provides a high-spatial-resolution distributed Raman optical fiber temperature measurement system and method.The system comprises a pulse laser, an avalanche photodetector, a signal acquisition module and an upper computer; the pulse laser outputs high-repetition-frequency narrow pulse laser to inject a sensing optical fiber, and excites a backscattering Raman effect; the avalanche photodetector converts scattered light into an electric signal; the signal acquisition module adopts an asynchronous equivalent time sampling technology, controls an ADC module through an FPGA module to collect signals point by point at a low sampling rate, recombines a high-resolution waveform by using a slight frequency difference between a sampling clock and a laser pulse repetition frequency, and improves a signal-to-noise ratio through a plurality of times of accumulation and averaging algorithms; and the upper computer reconstructs a complete time-domain waveform and demodulates temperature information of each position of the optical fiber.The high-spatial-resolution of 10 cm is realized, the system cost and complexity are reduced, and the system is suitable for high-precision temperature measurement scenes.
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