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PGC multi-sensor measurement system using pseudo-random code division multiplexing

A pseudo-random code and multi-sensor technology, applied in the field of photoelectric detection, can solve the problems that are not suitable for large-scale multiplexed array applications, cannot be continuously observed by a single sensor, and the precision of the limited light source can be adjusted, so as to achieve maximum design flexibility, Good temperature stability and anti-vibration stability, the effect of small changes

Active Publication Date: 2019-06-14
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Space-division multiplexing technology has the advantages of simple structure, easy implementation and no crosstalk, but its transmission efficiency is low, wasting fiber bandwidth resources, and it is not suitable for large-scale multiplexing array applications, and the system cost in remote transmission applications very big
Due to the use of multiple light sources with different wavelengths, the wavelength division multiplexing technology is expensive and limited by the adjustable accuracy of the light source
Time-division multiplexing technology cannot continuously observe a single sensor because of the query operation

Method used

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  • PGC multi-sensor measurement system using pseudo-random code division multiplexing

Examples

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Embodiment

[0076] Implementation example - three-component fiber optic seismometer for shallow wells based on random code multiplexing scheme

[0077] The optical path diagram of the embodiment is as follows figure 1 As shown, the entire optical fiber system includes a highly stable light source and modulation module 1, a sensor measurement module 2, a cascaded sensor array 3, a random code demodulation module 4, and an interference demodulation module 5. Among them, the interference demodulation module is connected to the The PC terminal on land performs demodulation, and the entire seismometer system includes two modules, the sensor measurement module 2 and the sensor cascade array 3, and there are no active components. The highly stable light source and modulation module 1, the random code demodulation module 4 and the interference demodulation module 5 are located on the well, and are separate systems that provide demodulation control over the entire seismometer.

[0078] The overal...

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Abstract

The invention discloses a PGC multi-sensor measurement system using pseudo-random code division multiplexing, and belongs to the technical field of the photoelectric detection. The system comprises anarrow-line wide-light source, a code division modulation-demodulation device, a multi-probe array, a photoelectric detector and a rear demodulation device. The laser performs modulation through an external sine signal, the modulated signal is added in the pseudo random noise code by the EOM to perform multiplexing; a corresponding signal of a sensing array of rear sensors is in interference afterbeing de-multiplexed, and then the subsequent PGC demodulation is performed. The system is sued for performing PGC multiplexing and modulation and demodulation under the condition of being limited bythe space and the cable amount; the optical interference signals of multiple back-end sensors can be demodulated in time-division, and the noise and narrow-band noise in a communication link can be effectively resisted due to the importing of the random code; the differential detection is performed at the demodulation end by utilizing the photoelectric detector characteristic, thereby eliminatingthe DC noise; the system can be used for the manufacturing of the PGC vibration sensor or used as the optical hydrophone single-fiber multi-sensor multiplexing scheme based on the PGC technology.

Description

technical field [0001] The invention belongs to the technical field of photoelectric detection, and in particular relates to a PGC multi-sensor measurement system using code division multiplexing of pseudo-random codes. Background technique [0002] The interferometric optical fiber sensor uses the phase change in the optical path to indirectly measure the physical quantity to be measured, including vibration, stress, displacement, speed, etc. This method has the characteristics of high sensitivity, good linearity, small size and large dynamic range. Typical fiber optic sensor applications include fiber optic hydrophones, fiber optic seismometers, fiber optic strain gauges, etc. Fiber-optic seismometers can monitor large-amplitude signals such as earthquakes and nuclear explosions. Optical fiber hydrophones are used to monitor underwater invisible targets and blind areas that cannot be detected by radar. [0003] The phase change in the optical path needs to be solved by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353
Inventor 杨军张毅博田帅飞邹晨祝海波苑勇贵李寒阳苑立波
Owner HARBIN ENG UNIV
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