公开(公告)号：WO2018064822A1

公开(公告)日：2018-04-12

申请号：PCT/CN2016/101522

申请日：2016-10-09

Applicant: SOUTH CHINA NORMAL UNIVERSITY

Inventor： ZHOU, Bin ,  SVANBERG, Sune ,  HE, Sailing

IPC: G01N21/31

CPC classification number: G01N21/39 ,  G01M3/047 ,  G01N2021/394 ,  G01N2201/0886

Abstract: A permeable optical fiber (100, 202, 304, 403, 701) for distributed gas sensing is described. The fiber (100, 202, 304, 403, 701) has got core (101, 502, 602) and cladding (102, 501, 601) structure. It can be arranged in a plurality of ways, but could have a permeable polymer cladding (102, 501, 601) to let the gas go inside the fiber (100, 202, 304, 403, 701) and a silica core (101, 502, 602) to guide light. The polymer cladding (102, 501, 601) is also designed to protect the fiber (100, 202, 304, 403, 701) from physical damage. In the optical fibers (100, 202, 304, 403, 701) some small part of light is distributed in the region of cladding (102, 501, 601), and the permeable cladding (102, 501, 601) makes the interaction between surrounding gas the guided light possible, and then the sensing of the gas surrounding the fiber (100, 202, 304, 403, 701) is realized by the laser absorption spectroscopy. The proposed sensing fiber (100, 202, 304, 403, 701) is preferentially used for long distance gas sensing system using a variety of arrangements, including the use of sections of the gas permeable fiber (100, 202, 304, 403, 701) as sensors located at various sites, and optically accessed through normal fiber transmission or by using the differential absorption lidar technique, there spatial concentrations along the same long fiber are measured by time-of-flight or phase shift techniques. Numerous gases can be monitored in connection with industrial, agricultural, mining operations, etc.

Abstract translation: 描述了用于分布式气体感测的可渗透光纤（100,202,304,403,701）。 光纤（100,202,304,403,701）具有芯部（101,502,602）和包层（102,501,601）结构。 它可以以多种方式布置，但可以具有可渗透的聚合物包层（102,501,601）以使气体进入纤维（100,202,304,403,701）内部并且二氧化硅核心（101,102） 502，602）来引导光。 聚合物包层（102,501,601）也被设计成保护光纤（100,202,304,403,701）免受物理损坏。 在光纤（100,202,304,403,701）中，光的一小部分分布在包层（102,501,601）的区域中，并且可渗透包层（102,501,601）使得 围绕气体引导可能的光，然后通过激光吸收光谱实现对光纤（100,202,304,403,701）周围的气体的感测。 所提出的传感光纤（100,202,304,403,701）优选地用于使用各种布置的长距离气体传感系统，包括使用透气纤维（100,202,304,403,701）的部分 ）作为位于不同地点的传感器，并且通过正常光纤传输或通过使用差分吸收激光雷达技术来光学访问，沿相同长光纤的空间浓度通过飞行时间或相移技术来测量。 在工业，农业，采矿作业等方面，可监测多种气体。

公开(公告)号：WO2018064821A1

公开(公告)日：2018-04-12

申请号：PCT/CN2016/101521

申请日：2016-10-09

Applicant: SOUTH CHINA NORMAL UNIVERSITY

Inventor： SVANBERG, Sune ,  ZHAO, Guangyu ,  ZHOU, Bin

IPC: G01N21/31

CPC classification number: G01N21/39 ,  G01N21/552 ,  G01N2021/394 ,  G01N2201/0886

Abstract: A distributed optical fiber gas sensing system (100) based on evanescent field sensing, spatially resolved along the fiber (105, 200, 300) and obtained by employing differential absorption lidar techniques is described. The fiber (105, 200, 300) can be arranged in a plurality of ways, and could have a porous cladding (202) sensing fiber (105, 200, 300) as the sensing unit. The sensing fiber (105, 200, 300) has a solid core (201) to guide light and a porous cladding (202) to protect the fiber (105, 200, 300) from physical damage and to enlarge the interface of the evanescent field and the test gas. A pulsed or modulated laser (103), a 3-dB optical coupler (104) and a photomultiplier tube (PMT) (107) form a typical OTDR sensing system. The pulse generator (102) is to control the pulse width, period, duty cycle of the pulsed laser (103). The data acquisition card (106) is to record the amplitude of the reflected light detected by the PMT (107). The controller (101) which usually is a computer is for signal recording and system synchronizing.

Abstract translation: 描述了基于渐逝场感测的分布式光纤气体传感系统（100），其沿光纤（105,200,300）空间分辨并通过采用差分吸收激光雷达技术获得。 纤维（105,200,300）可以以多种方式布置，并且可以具有感测纤维（105,200,300）作为感测单元的多孔包壳（202）。 传感光纤（105,200,300）具有引导光的实芯（201）和多孔包层（202），以保护光纤（105,200,300）免受物理损伤并扩大消逝场的界面 和测试气体。 脉冲或调制激光器（103），3-dB光耦合器（104）和光电倍增管（PMT）（107）形成典型的OTDR传感系统。 脉冲发生器（102）用于控制脉冲激光器（103）的脉冲宽度，周期，占空比。 数据采集​​卡（106）记录由PMT（107）检测到的反射光的振幅。 通常是计算机的控制器（101）用于信号记录和系统同步。