On June 5, 2024, the China National Defense Information Equipment and Technology Expo (hereinafter referred to as “CNTE”) officially opened in Beijing, and Puniu Technology brought self-developed high-performance distributed fiber optic sensing (hereinafter referred to as “HiFi-DAS”) products to the exhibition. Relying on the advanced technology achievements of the State Key Laboratory of “Regional Optical Fiber Communication Network and New Optical Communication System” of Shanghai Jiao Tong University, 100 km long distance detection, 100 kHz high response bandwidth, sub-meter spatial positioning, and the cutting-edge performance of HiFi-DAS products, Pu Niu Technology has won the recognition of peers and customers.

AVF234SF132 Photo: CNTE2024 Beijing National Defense Information Equipment and Technology Expo opens

During the exhibition, Puniu HiFi-DAS products attracted the attention of many professionals with their excellent performance indicators, highly integrated design and rich application scenarios. Guests from defense procurement and technology departments, military groups and scientific research institutes, military and civilian high-tech enterprises and other exhibition guests on the company’s product characteristics, technical parameters and potential application scenarios and on-site engineers conducted in-depth exchanges.

Figure: Expert guests at the meeting exchanged views with Pu Niu Technology on high-performance DAS products and applications

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It is reported that the Distributed Acoustic Sensing system (DAS) is an optical instrument that uses optical fiber as a sensor to sense acoustic vibration. In a DAS system, a single fiber is used as a continuous, distributed sound and vibration sensor that can monitor and analyze sound, vibration and other signals in real time. Compared with all kinds of traditional sensors, the system takes the communication cable itself as the sensing unit, with intrinsic safety, no electromagnetic interference, high sensitivity, long life and other characteristics, in the long distance, high precision, continuous distributed vibration monitoring has incomparable advantages, widely used in disaster prevention and reduction, material exploration, pipeline inspection, perimeter security, traffic safety and other fields.

AVF234SF132 Experts said that the traditional DAS is limited by its inherent technical principle, in the sensing distance, spatial resolution, response bandwidth, strain sensitivity and other key indicators are mutually restricted, if you want to improve the response bandwidth, it is necessary to reduce the spatial resolution, its performance indicators have a strong coupling relationship, can not have both.

In 2019, relying on the advanced technological achievements of the State Key Laboratory of “Regional Optical Fiber Communication Network and New Optical Communication System” of Shanghai Jiao Tong University, based on TGD-OFDR (Time-gated Digital Optical frequency Domain Reflectometer) technology, Pu Niu Technology has overcome problems such as sensing distance, spatial resolution, and coherent fading noise. The HiFi-DAS distributed optical fiber acoustic wave sensing system has been successfully developed. This high performance DAS technology route, through decoupling, comprehensively improves the four core indicators, and eliminates the measurement blind area of traditional technology, and realizes the high availability and high reliability of the system. At present, Pu Niu HiFi-DAS can achieve a sensing distance of 100 km and a spatial resolution of 1 m at the same time, the detection response frequency band is 0.001 HZ-100 kHz, and the minimum peak-to-peak value of the strain signal is better than 3 pε/√Hz.