Phase shift signal modulation based sensor array modulation and demodulation method and device

A sensor array, signal modulation technology

Inactive Publication Date: 2017-10-20
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a modulation and demodulation method and device for a sensor array based on phase-shift signal modula...

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  • Phase shift signal modulation based sensor array modulation and demodulation method and device
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  • Phase shift signal modulation based sensor array modulation and demodulation method and device

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Embodiment 1

[0054] Experimentally tested the vibration information of four optical fiber Michelson optical fiber sensors 7 at 100 Hz, the length difference between the reference arm 13 and the signal arm 14 is 2.8 m, the sampling time is 0.02 s, the frequency of optical pulse generation is 1 MHz, and the optical pulse width is 200ns, the frequency of the phase modulation is 1MHz, the pulse width of the phase modulation in one cycle is 28ns, and the rising edge of the phase modulation pulse is 86ns after the rising edge of the optical pulse. The central wavelengths of the laser light source wavelengths are 1561.4nm, 1560.6nm, 1559.8nm, 1559.0nm, and the sensitivities of the four fiber optic sensors are slightly different. The selected wavelength of the optical add-drop multiplexer corresponds to the wavelength of the light source one by one. The measuring device is as figure 1 As shown, the measurement steps are:

[0055] Step 1, turn on the laser light source 1 and the micro-vibration ta...

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Abstract

The invention discloses a phase shift signal modulation based sensor array modulation and demodulation method and device. The device includes a laser light source, an isolator, an optical switch, a phase modulator, an optical add-drop multiplexer, sensors, a delay optical fiber, a signal generator, a photovoltaic detector, a data collection and processing module and a micro-vibration table. The light source generates optical pulses through the optical switch and the optical pulses are subjected to pulse phase modulation and are then sent into the sensor array. Laser pulses of corresponding wavelengths are selected by the optical add-drop multiplexer and are allowed into sensors. Generation of multi-channel phase shift signals is achieved at output terminals. Then interference signals with vibration phase information are merged into the photovoltaic detector. Through calibrating the multi-channel signals and with the association of a phase shift algorithm, vibration phase demodulation of the optical fiber sensors are realized. The method provided by the invention is simple in optical paths, simple in demodulation circuits, high in real time performance, high in precision, wide in dynamic range, high in anti-environment interference, low in device use and low in cost.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a modulation and demodulation method and device for a sensor array based on phase-shift signal modulation. Background technique [0002] Optical fiber sensing technology is a new technology developed rapidly in the late 1970s in the world. Compared with traditional detectors, optical fiber sensors have the advantages of light weight, anti-electromagnetic interference, high sensitivity, safety, reliability, corrosion resistance, and strong multiplexing ability. , can achieve long-distance distributed applications. It has been applied in oil well temperature and pressure measurement, oil pipeline monitoring, logging technology, seismic wave monitoring, bridge and building monitoring, etc. Distributed application of fiber optic sensors is a hot spot in research and engineering applications in recent years. [0003] Distributed sensing uses a hybrid multip...

Claims

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Application Information

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IPC IPC(8): G01J9/02G01D5/26
CPCG01J9/02G01D5/266G01D5/268G01J2009/0226
Inventor 朱日宏任仲杰王海林李建欣王晓烨
Owner NANJING UNIV OF SCI & TECH
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