Image demodulation method and device for temperature and pressure measurement based on fbg sensor
A technology for measuring images, temperature and pressure, applied in the direction of measuring devices, instruments, etc., can solve the problems of practical requirements and limitations without high cost, achieve strong wavelength division multiplexing ability and anti-interference ability, reduce spot, save space Effect
Active Publication Date: 2016-09-07
SHAANXI UNIV OF SCI & TECH
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For FBG sensing systems, it is usually required that the demodulation system has a high demodulation speed and accuracy, to achieve both dynamic and static detection, and to be able to detect weak light signals, the stronger the ability to detect weak light signals, the fiber Bragg grating sensing system The more sensing gratings that can be multiplexed, the more corresponding measurement points, but they are currently limited. So far, there is no recognition technology that can simultaneously meet the requirements of high-resolution, multi-physical quantity, and multi-point multiplexing. Practical requirements with low cost
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[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0020] Such as figure 1 As shown, a temperature and pressure measurement image demodulation method based on FBG sensors, multiple FBGs sensors are connected in series on two optical fibers, and the reflected light of each FBGs sensor first passes through its corresponding 1*2 coupler, and then passes through The trigger triggers and stores the FBGs information, and then the trigger selects a channel to connect with the 2*2 optical switch, gathers them in a restricted plane, and then gathers them into an array of spots through the focusing lens and is captured by the INGAAS image sensor. According to the formula Calculate the displacement Δλ of the wavelength of the FBG grating, and then identify the signal of each FBGs sensor, where p is the pixel size, Δp is the number of pixel offsets, f is the focal length of the camera, and D is the distance from the len...
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The invention relates to a temperature and pressure measurement image demodulation method based on an FBG (Fiber Bragg Grating) sensor. The temperature and pressure measurement image demodulation method comprises the following steps: connecting a plurality of FBGss (Fiber bragg Gratings) sensors on two optical fibers connected in series, enabling reflected light of the FBGs sensors to firstly pass through respective corresponding 1*2 couplers and then to be triggered by a trigger and storing FBGs sensor information; successively, connecting a trigger selector with a certain closed circuit of a 2*2 optical switch to enable the FBGs sensors to be collected in a limited plane, gathering light spots through a focusing lens to enable an INGAAS image sensor to obtain array light spots transmitted from the special optical switch, calculating all displacement amounts delta lambda of FBG wavelengths according to the formula in the description and further identifying signals of all the FBGs sensors. According to the temperature and pressure measurement image demodulation method, the micro signals of the FBGs sensors can be detected and identified, the quick and accurate measurement of temperature and pressure measurement image demodulation is realized, and a device for realizing the method is provided through taking the internal temperature and pressure of canned natural gas as an example.
Description
technical field [0001] The invention belongs to the application field of FBG sensors, and relates to multi-signal analysis and identification of FBG sensors, in particular to a temperature and pressure measurement image demodulation method and device based on FBG sensors. Background technique [0002] The essence of signal recognition technology is to monitor the reflection spectrum of the sensing grating (FBG) in real time and analyze the position of the central wavelength. That is, the process of converting the signal from an optical signal to an electrical signal, and then from an electrical signal to a digital signal. For FBG sensing systems, the demodulation system is usually required to have high demodulation speed and accuracy, to achieve both dynamic and static detection, and to be able to detect weak light signals. The stronger the ability to detect weak light signals, the fiber Bragg grating sensing system The more sensing gratings that can be multiplexed, the mor...
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IPC IPC(8): G01D21/02
Inventor 王晓霞王芬王卫林吴春英
Owner SHAANXI UNIV OF SCI & TECH