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China’s Submarine Fleet, Evolution & news

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9月14日,国务院派驻中船重工监事会主席刘顺达到渤船调研。
 
95 is a nuclear attack sub. 96 is a nuclear missile sub. One is used for conventional warfare while the other is for nuclear deterrence.
095 is still strictly classified````the "newest nu-sub" is actually a modified 093, but huge boost of its arsenals, sonars and control-and-command system````we are all holding breath for 095, wish it will surprise us like new AIP-subs do``:lol:
 
China's ultra-sensitive magnetic sensor technology to capture all submarines [SOSUS]

The new magnetometer developed by the Chinese Academy of Sciences can capture the weakest magnetic field in a few kilometers away. The basis of this instrument is the Superconducting Quantum Interferometer (SQUID), which utilizes the principles of quantum mechanics. The SQUID can record changes in the electronic interference situation under the influence of an external magnetic field, which has a discontinuous stepped characteristic.

China's new SOSUS system 中国新打造的SOSUS系统原理图 - Schematic diagram.jpg

China's new SOSUS system- Schematic diagram 中国新打造的SOSUS系统原理图

In the Chinese Navy's SOSUS or sound surveillance system, this new technology is currently China's leading technology in the world, called superconducting quantum interferometer (SQUID). SQUID utilizes the principles of quantum mechanics and a new set of Chinese scientists to develop a new algorithm that captures the weakest disturbance of objects on the Earth's magnetic field in a few kilometers, and its acquired signals are transmitted through the submarine fiber to the ultra-high-speed information processing center, so that experienced anti-submarine experts locked the enemy underwater attack platform accurate location. Once China has applied this technology to the underwater detection network, then all the submarine noise reduction efforts in the United States, Japan and NATO are lost. Because even if the American advanced "Sea Wolf" class nuclear submarines shut down the engines and all equipment for their own safety, do not make any sound, but will still be found by the SQUID based ultra-sensitive magnetometer network.

China's new SOSUS system 中国海军SOSUS系统的模型 - Model.jpg

China's new SOSUS system - Model 中国海军SOSUS系统的模型

中国研制出超灵敏磁力传感器技术 能捕获一切潜艇 [2017-08-29]
http://mil.news.sina.com.cn/jssd/2017-08-29/doc-ifykiurx2626638.shtml

See also:

An Ultra-Sensitive Magnetic Field Sensor Based on Extrinsic Fiber-Optic Fabry–Perot Interferometer and Terfenol-D
http://ieeexplore.ieee.org/document/7112460/

Abstract:
We report a fiber-optic magnetic field sensor with ultra-high sensitivity based on a precisely configured extrinsic fiber-optic Fabry-Perot interferometer (EFFPI) and Terfenol-D slab. The EFFPI was simply formed by placing two well-cleaved single-mode fibers with carefully designed spacing and it was bonded to the surface of a Terfenol-D slab by epoxy resin. The experiments demonstrate good linear relationship between the applied magnetic field strength and the wavelength shift up to 560 Oe and the measurement range is only limited by the available bandwidth of the light source. The maximal sensitivity of the magnetic field measured by the proposed sensor is 854.73 pm/Oe through monitoring the shift of wavelength dip of the spectrum reflected from the EFFPI, which is significantly larger than most of the reported results. We also evaluated the repeatability of the proposed sensor and the performance of the proposed sensor working at a direct-current (dc)-biased magnetic field. Results indicated that the proposed fiber-optic magnetic field sensor exhibits good restorable measurement performance up to 140 Oe and a preapplied dc magnetic field can be used to extend the linear measurement dynamic range.

Published in: Journal of Lightwave Technology ( Volume: 33, Issue: 15, Aug.1, 1 2015 )

I. Introduction
The magnetic field sensor can be widely used in the information storage, navigation, aerospace, military, and biomedical detection [1], etc. In the past few years, magneto-optical sensors have attracted great attention due to their unique advantages, such as small size, compact design, low cost, and immunity to electromagnetic interference as compared with their conventional competitors [2]. In principle, the fiber-optic system can detect magnetic field directly by measure the Faraday rotation of the light polarization [3]. Since no external transducer is required, this mechanism is ideal as an intrinsic sensor. However, its sensitivity is low due to the small Verdet constant of silica fibers. In order to employ fiber-optics to sense magnetic field and overcome the drawback of small magnetic sensitivity, the concept of fiber-optic strain sensor in conjunction with magnetostrictive material to detect tiny magnetic fields was first proposed in 1980 [4] and then achieved in 1983 [5]. In this kind of fiber-optic magnetic sensor, the magnetostrictive material functions as a magnetic actuator with magnetostrictive strain as the output, while the fiber-optic strain sensor operates as a strain sensor with the magnetostrictive strain from the magnetostrictive materials as the input [6].

Authors:

ZHANG Peng
National Engineering Laboratory for Next Generation Internet Access System, School of Optics and Electronic Information, Huazhong University of Science and Technology, Wuhan, China

TANG Ming
National Engineering Laboratory for Next Generation Internet Access System, School of Optics and Electronic Information, Huazhong University of Science and Technology, Wuhan, China

GAO Feng
National Engineering Laboratory for Next Generation Internet Access System, School of Optics and Electronic Information, Huazhong University of Science and Technology, Wuhan, China
 

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