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Time division multiplexing optical fiber sensing method and apparatus

A technology of optical fiber sensing and time division multiplexing, which is applied in the direction of using optical devices to transmit sensing components, can solve the problems of small number of optical fiber sensors and complex wavelength demodulation equipment, and achieve the goal of increasing the number of sensors, simplifying the structure, and reducing the price Effect

Active Publication Date: 2009-07-08
冷劲松
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  • Abstract
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Problems solved by technology

[0003] The purpose of the present invention is to provide a time-division multiplexing optical fiber sensing method and device thereof, to overcome the existing optical fiber sensing demodulation technology based on wavelength division multiplexing. Since each optical fiber sensor uses a different center wavelength, the wavelength demodulation The defects of complex equipment and the small number of fiber optic sensors that can be set by the system due to bandwidth limitations

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  • Time division multiplexing optical fiber sensing method and apparatus
  • Time division multiplexing optical fiber sensing method and apparatus
  • Time division multiplexing optical fiber sensing method and apparatus

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specific Embodiment approach 1

[0007] Specific implementation mode one: the following combination figure 1 This embodiment will be specifically described. The method of this embodiment is composed of the following steps: 1. Using a semiconductor optical amplifier to generate a pulsed light signal to enter the sensor array; the sensor array is composed of a plurality of sensors connected in series through an optical fiber, and the sensors are low reflection The center wavelength of multiple fiber gratings is the same; second, the pulsed optical signal is reflected back to the semiconductor optical amplifier by each sensor in turn, and the optical signal reflected by a certain sensor is selectively passed through by controlling the switching time of the semiconductor optical amplifier; 1. After the signal passing through the semiconductor optical amplifier is amplified, it enters the wavelength measurement module to realize the wavelength measurement of the selected sensor.

[0008] The device of this embodi...

specific Embodiment approach 2

[0013] Specific implementation mode two: the following combination figure 1 This embodiment will be specifically described. The difference between this embodiment and Embodiment 1 is that in step 3 of the method, the optical signal amplified by the semiconductor optical amplifier is partially reflected back to the sensor array by the optical reflection device, and then reflected back by the sensor array, and passes through the semiconductor optical amplifier. After being amplified, it is reflected by the optical reflective device, and this is repeated many times until the semiconductor optical amplifier is saturated; the optical signal transmitted through the optical reflective device enters the wavelength measurement module to realize the wavelength measurement of the sensor.

[0014] Since the sensor array is composed of multiple sensors connected in series, each sensor must be a low-reflectivity grating to ensure that the signal transmitted to the remote sensor is not exces...

specific Embodiment approach 3

[0015] Specific implementation mode three: the following combination image 3 This embodiment will be specifically described. The difference between this embodiment and Embodiment 1 is that its device also includes a No. 1 coupler 9 and a No. 2 coupler 10, the No. 2 coupler 10 is a 20:80 coupler, and the wavelength measurement module 3 and the No. 2 coupler 20% of the splitting end of No. 10 is connected, and 80% of the splitting end of No. 2 coupler 10 is connected with a splitting end of No. 1 coupler 9, and another splitting end of No. 1 coupler 9 is connected with the reflected signal of semiconductor optical amplifier 1. The input end is connected, the other end of the first coupler 9 is connected with one end of the fiber ring 4 , and the other end of the second coupler 10 is connected with the amplified signal output end of the semiconductor optical amplifier 1 .

[0016]In this embodiment, taking the addressable sensor G1 as an example, the period of the pulse signal ...

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Abstract

The invention discloses a time division multiplexing optical fiber sensing method and a device thereof, relates to an optical sensing method and a device thereof and overcomes the drawback of the wavelength division multiplexing optical fiber sensing demodulation technology of complicated wavelength demodulation equipment due to the use of different central wavelengths of optical fiber sensors and a small number of configured optical sensors due to the bandwidth limitation of the system. The method comprises: a semiconductor optical amplifier generates a pulse optical signal which enters a sensor array; the pulse optical signal is sequentially reflected by all sensors back to the semiconductor optical amplifier, and the opening and closing time of the semiconductor optical amplifier is controlled to allow an optical signal reflected back by a certain sensor to pass through selectively; and the measurement of a selected sensor is realized. The device comprises the semiconductor optical amplifier, a pulse signal generator, a wavelength measuring block, an optical fiber ring and a plurality of sensors, wherein the sensors, the wavelength measuring blocks and the pulse signal generator are communicated with a reflected signal input end, an amplified signal output end and a controlled end of the semiconductor optical amplifier respectively.

Description

technical field [0001] The invention relates to an optical fiber sensing method and a device thereof, in particular to a sensing method and a device thereof which can increase the number of optical fiber sensors connected with a single optical fiber. Background technique [0002] Optical fiber sensor is a functional optical fiber sensor using fiber grating as a sensitive element, which can measure physical quantities such as temperature and strain. Compared with traditional sensors, it has the advantages of light weight, anti-electromagnetic interference, and corrosion resistance. In addition, due to the use of wavelength as the sensor signal code, an optical fiber sensor network can be established, and the sensor has high precision and is easy to integrate. Therefore, optical fiber sensing technology has become a research hotspot at home and abroad. Now the key issue of this kind of sensing technology research is how to design a demodulation system with high precision, lo...

Claims

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Application Information

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IPC IPC(8): G01D5/26
Inventor 冷劲松刘彦菊代勇波
Owner 冷劲松
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