Optical fiber grating temperature-pressure sensor for high-pressure flow liquid testing
A fiber grating and high-pressure fluid technology, applied in the field of sensors, can solve the problems of affecting the accuracy of pressure measurement, not being able to withstand large pressure changes for a long time, and limited working life, so as to achieve long service life, loose tolerance and extended life.
Inactive Publication Date: 2011-11-16
北京融文贸易有限公司
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[0008] Chinese patent 02121327.5 discloses a fiber grating temperature-pressure sensor that can simultaneously measure temperature and pressure. Its basic principle is based on the cantilever beam technology; The change of the reflected wavelength of the fiber grating is subject to a wide range of pressure changes due to long-term mechanical movement. The current packaging process cannot guarantee that the wavelength is stable and does not drift, and the working life is limited in the low pressure range. This mechanism cannot be applied to large pressure. variation range
[0009] It can be seen from the above that the existing technology has the following problems: first, the temperature and pressure of the ordinary fiber grating sensor cannot be separated, and the temperature change of the fiber grating greatly affects the accuracy of pressure measurement; second, the packaging method of the ordinary fiber grating temperature and pressure sensor cannot Guaranteed measurement reliability and longevity
The third is that the use of cantilever beams and other methods with mechanical movement cannot withstand large pressure changes for a long time
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[0034] A fiber grating sensor for detecting the temperature or pressure of high-pressure fluid of the present invention will be described in detail below with reference to the embodiments and the accompanying drawings.
[0035] Such as figure 1 , figure 2 , image 3 As shown, a fiber grating sensor for detecting high-pressure fluid temperature or pressure of the present invention includes: a porous metal protective cover 5, a sheath 4 located in the protective cover 5, silicone oil 3 filled in the sheath 4, And the fiber grating sensing element 15 composed of the fiber grating sensing head 1 composed of dual-hole single-mode photosensitive optical fiber and the single-mode transmission optical fiber 2 connected to the two ends of the fiber grating sensing head 1, which is arranged in the sheath 4; The stainless steel tube 6 of the grating sensing element 15 has a thickness of more than 5 mm so as to withstand high pressure without deformation. ; The metal mesh cover 7 that...
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Abstract
The present invention relates to a fiber grating sensor for detecting temperature or pressure of high-pressure fluid, wherein it comprises; a porous metal protective frame, a sleeve inside the protective frame, the silicon oil filled into the sleeve, the fiber grating sensor inside the sleeve formed by dual-hole single-mode light-sensing fiber, and the fiber grating sensor connected to two ends of fiber grating sensor and formed by single-mode transmission fiber, the stainless steel tube packing the fiber grating sensor, the metal frame at the bottom of stainless steel tube, the locking nut for fixing the metal frame on the bottom of stainless steel tube, the cable joint tube at the top of stainless steel tube, the upper cap covering the cable jointing tube, and the wire tube of fiber grating sensor at the top of upper cap. The fiber grating sensor is through the cable jointing tube into the upper cap; at said end, the single-mode transmission fiber is extended outside the wire tube. The invention has high accuracy, large pressure range, and long service life.
Description
technical field [0001] The invention relates to a sensor. In particular, it relates to an optical fiber grating sensor with high precision and large pressure range for detecting the temperature or pressure of high-pressure fluid. Background technique [0002] Fiber Bragg grating sensor is a new type of sensor being developed in recent years. Fiber Bragg grating sensor can integrate information sensing and transmission. Compared with traditional sensors, it has many advantages: such as explosion-proof, anti-electromagnetic interference, anti-corrosion, anti-vibration , high temperature resistance, small size, light weight, flexible and convenient. In particular, it can be used in harsh environments. In the development and production of oil fields, people need to know the distribution and flow parameters (temperature, pressure, flow, etc.) of fluids (oil, gas and water) in the relevant formations in order to control them. So as to obtain the best running state. In order to ...
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IPC IPC(8): E21B47/06
Inventor 董苏姗郭转运张强马琳萍
Owner 北京融文贸易有限公司