A Distributed Optical Fiber Vibration and Temperature Dual Physical Quantity Sensing and Positioning System
A distributed optical fiber, sensing and positioning technology, applied in the field of sensing and detection, can solve the problems of immature and unengineerable practical applications, and achieve the effect of reducing occupancy
Active Publication Date: 2020-07-31
TIANJIN UNIV
View PDF12 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, there are few and immature methods to realize the monitoring of the two at the same time, such as OFDR, which cannot realize the practical application of engineering
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0020] Embodiment: the present invention is used for the polarization control in the distributed optical fiber disturbance location system, such as figure 2 As shown, the system includes the following components:
[0021] Light source: Two light sources are used, one light source is a pulsed laser with a center wavelength around 1550nm, and the other light source is a narrow bandwidth distributed feedback laser (DFB) with a center wavelength around 1310nm, which is used to realize fiber vibration sensing.
[0022] Optical isolator 3: used to ensure the one-way passage of light, and isolate the 1310nm light from entering the laser 1, so as to ensure that the laser is not damaged;
[0023] Optical circulators 4 and 5: used to transmit the light emitted by the light source to the object to be detected and collect the reflected signal light, and isolate the opposite light from entering the laser;
[0024] Fiber couplers 4, 7, 8 and 9: include three 50:50 fiber couplers 4, 7 and...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a distributed optical fiber vibration and temperature double physical quantity sensing and positioning system, which is based on double Mach-Zehnder interference and Raman backscattering. The system includes a light source, an optical circulator, a wavelength division multiplexer WDM, and a photoelectric detector. Optical fiber coupler, sensing cable, data acquisition card, optical isolator and computer; among them, the light source uses two lasers with different wavelengths, adopts wavelength division multiplexing technology, and utilizes a sensor in the Mach‑Zehnder interferometer The temperature sensing is realized on the arm, and at the same time, it does not interfere with the optical signal used for vibration sensing. Finally, the sensing and positioning of the two physical quantities of vibration and temperature can be realized in at least two sensing fibers, and this method can effectively reduce the Occupancy of sensing fibers in fiber optic links. Compared with using two technologies to detect vibration signals and temperature signals respectively, this method effectively saves optical fiber resources and can realize uninterrupted real-time sensing.
Description
technical field [0001] The invention belongs to the technical field of sensing and detection, in particular to a distributed optical fiber vibration and temperature dual physical quantity sensing and positioning system based on interference and Raman scattering. Background technique [0002] With the continuous development of society, the safety inspection of important places and facilities such as oil depots, power plants, and oil pipelines is particularly important. Among them, distributed optical fiber sensing has many characteristics such as no charge, high voltage resistance, corrosion resistance, and anti-electromagnetic interference, and has increasingly become an important means and method in the field of safety detection. Among them, the monitoring of two physical quantities, vibration perception and temperature change, is particularly important. For example, vibration detection can be used to realize intrusion detection, and temperature perception can be used to pr...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00G01K11/32G01K11/324
CPCG01H9/004G01K11/32G01K11/324
Inventor 刘琨刘铁根潘亮江俊峰马春宇田苗
Owner TIANJIN UNIV