Interference type optical fiber vibration sensing demodulation system and method based on photoelectric oscillator

A technology of photoelectric oscillator and optical fiber vibration, which is applied in the direction of transmitting sensing components, converting sensor output, and instruments by using optical devices, which can solve the problems of limiting the dynamic range and performance of vibration sensors, so as to increase the dynamic range and simplify demodulation System, the effect of improving the measurement accuracy

Inactive Publication Date: 2019-12-03
BEIJING JIAOTONG UNIV
View PDF4 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the output optical power of the interferometer has a sinusoidal relationship with the vibration signal to be measured, which greatly limits the dynamic range of the vibration sensor
At present, phase-generated carrier (PGC)

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Interference type optical fiber vibration sensing demodulation system and method based on photoelectric oscillator
  • Interference type optical fiber vibration sensing demodulation system and method based on photoelectric oscillator
  • Interference type optical fiber vibration sensing demodulation system and method based on photoelectric oscillator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The embodiment of the present invention provides a system and method for interferometric optical fiber vibration sensing and demodulation based on a photoelectric oscillator, which maps the vibration signal to be measured to the frequency change of the microwave signal generated by the photoelectric oscillator, and improves the vibration sensing system. The measurement accuracy is high, the dynamic range is increased, and the demodulation method is simplified.

[0029] Schematic structure diagram of an interferometric optical fiber vibration sensing and demodulation system for a photoelectric oscillator provided by an embodiment of the present invention Figure 1 like figure 1 As shown, the device includes: light source 1, electro-optic modulator 2, interference type vibration sensing unit 3, polarization controller 4, polarizer 5, photodetector 6, bandpass filter 7, microwave amplifier 8, power divider device 9 and frequency monitoring unit 10.

[0030] The light sou...

Embodiment 2

[0055] This embodiment provides an interferometric optical fiber vibration sensing and demodulation system based on a photoelectric oscillator, and its specific implementation structure is as follows Figure 4 As shown, the measuring device includes: a light source 1, an electro-optic modulator 2, an interferometric vibration sensing unit 3, a polarization controller 4, a polarizer 5, a photodetector 6, a bandpass filter 7, a microwave amplifier 8, a power Divider 9 and frequency monitoring unit 10.

[0056] The specific principle and implementation manner of interferometric optical fiber vibration sensing and demodulation using the system of the embodiment of the present invention are similar to the description in the first embodiment above, and will not be repeated here. The difference between the embodiment of the present invention and the first embodiment is that: in the embodiment of the present invention, the optical signal output by the light source first passes through...

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

No PUM Login to view more

Abstract

The invention provides an interference type optical fiber vibration sensing demodulation system and method based on a photoelectric oscillator, and the system mainly comprises a light source, an electro-optic modulator, an interference type vibration sensing unit, a polarization controller, a polarizer, a photodetector, a microwave amplifier, a power divider and a frequency monitoring unit. In theinvention, the electro-optic modulator is used to generate phase-dependent polarization orthogonal carrier waves of different frequency components and a first-order single-sideband, polarization characteristics are adopted to separate the carrier waves and first-order single-sideband such that the carrier waves and first-order single-sideband are transmitted along two interference arms in the interference type vibration sensing unit, and the phase difference containing the vibration signal to be measured is converted into a change in the microwave oscillation frequency of the photoelectric oscillator with a high Q value. Therefore, the vibration signal to be measured can be demodulated by monitoring the frequency change of the microwave signal output by the photoelectric oscillator. Thisamount of frequency change is proportional to the vibration signal to be measured, and the proportionality factor is determined by the frequency of the optical carrier, so that vibration detection anddemodulation with high sensitivity, high accuracy and fast response can be achieved.

Description

technical field [0001] The invention relates to the technical fields of optical fiber optics, optical fiber sensing, optical fiber hydrophones, microwave photons, etc., and in particular to an interference type optical fiber vibration sensing demodulation system and method based on a photoelectric oscillator. Background technique [0002] Vibration is an important topic in many fields of modern physics and science and technology. Vibration sensing is widely used in hydrophones, seismic monitoring, oil wells, security, and condition monitoring of construction projects and infrastructure. Compared with traditional electromagnetic vibration sensors, fiber optic vibration sensors have the characteristics of anti-electromagnetic interference, corrosion resistance, small size, easy reuse and easy networking, and have attracted the attention and research of relevant scholars. According to the different physical parameters to be modulated, fiber optic vibration sensors can be divide...

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
no application Login to view more
IPC IPC(8): G01H9/00G01D5/353
CPCG01D5/35322G01D5/35325G01D5/35329G01H9/004
Inventor 王目光张静牟宏谦武蓓蕾刘艳曹继红范国芳
Owner BEIJING JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap