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Time division multiplexing (TDM)-based low-reflectivity triangle spectrum-shaped fiber grating sensing system

A technology of fiber grating and time division multiplexing, which is applied in the direction of using optical devices to transmit sensing components, etc., can solve the problems of high price, limited application, difficult application, etc., and achieve the effect of reducing costs

Inactive Publication Date: 2012-02-15
WUHAN UNIV OF TECH
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Problems solved by technology

[0007] Among these methods, the space division multiplexing method can improve the system capacity limited, and is limited by the service life of the optical switch device, and the application is limited; the time division multiplexing technology can greatly increase the system capacity, but it needs to use a high-power broadband light source, and the price Expensive, difficult to apply in practical engineering

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  • Time division multiplexing (TDM)-based low-reflectivity triangle spectrum-shaped fiber grating sensing system
  • Time division multiplexing (TDM)-based low-reflectivity triangle spectrum-shaped fiber grating sensing system
  • Time division multiplexing (TDM)-based low-reflectivity triangle spectrum-shaped fiber grating sensing system

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Embodiment Construction

[0019] An embodiment of the present invention is figure 2 shown. A low-reflectivity triangular spectrum fiber Bragg grating sensing system based on time division multiplexing, mainly composed of a distributed feedback laser 6, an electro-optical modulator 7, a circulator 8, an optical amplifier 9, a triangular spectrum fiber Bragg grating sensor 10, and a high-speed optical detector 11 , pulse signal generator 12, signal acquisition device 13 and other components.

[0020] The fiber grating sensor is obtained by excimer laser through ultraviolet exposure method, image 3 In the spectral response diagram of the triangular spectral fiber grating sensor shown, the spectral shape of the sensor is triangular, which is obtained by using a chirped fiber grating phase mask and non-uniform exposure. Each triangular spectrum fiber grating sensor in the system uses exactly the same process parameters in the production process, so it has the same spectral response, and through the expo...

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Abstract

The invention discloses a time division multiplexing (TDM)-based low-reflectivity triangle spectrum-shaped fiber grating sensing system. The system mainly comprises a distribution feedback laser, an electro-optical modulator, a circulator, an optical amplifier, a triangle spectrum-shaped fiber grating sensor, a high-speed optical detector, a pulse signal generator and a signal acquisition device, wherein the distribution feedback laser is used for emitting narrow line-width laser; pulse signal light is formed by the narrow line-width laser through the electro-optical modulator or is generated by internal modulation through the distribution feedback laser; the pulse light passes through the circulator and then is reflected by a triangle spectrum-shaped fiber grating; the reflected light passes through the circulator to enter the optical amplifier and is amplified into the high-speed optical detector; and a light signal is converted into an electrical signal through the high-speed optical detector, and the electrical signal is converted into a digital signal and is processed through the signal acquisition device. In the system, the distribution feedback laser and the low-reflectivity triangle spectrum-shaped fiber grating sensor are combined, a large-scale fiber grating sensing network is constructed through TDM, and thousands of sensors are multiplexed on a single fiber, so that the costs of a light source and a wavelength detection device are reduced.

Description

technical field [0001] The invention belongs to the field of optical fiber sensing, in particular to a large-capacity optical fiber grating sensing system and a construction method thereof. Background technique [0002] Optical fiber sensing is a new type of sensing technology emerging with the development of optical fiber communication, and it is an important part of the Internet of Things technology. Optical fiber sensing technology has many unique advantages such as anti-electromagnetic interference, good long-term stability, integration of sensing and transmission, small size, light weight, etc., and is being widely used in many fields such as civil engineering, electric power, petrochemical, and transportation. Among them, fiber grating sensing is one of the most researched and applied technologies. In addition to the characteristics of general optical fiber sensing, the fiber grating sensing system also has the characteristics of wavelength encoding. It adopts the mea...

Claims

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Application Information

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IPC IPC(8): G01D5/353
Inventor 文泓桥
Owner WUHAN UNIV OF TECH
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