CN211291815U - External self-calibration device of distributed optical fiber temperature sensing system - Google Patents
External self-calibration device of distributed optical fiber temperature sensing system Download PDFInfo
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- CN211291815U CN211291815U CN202020138483.2U CN202020138483U CN211291815U CN 211291815 U CN211291815 U CN 211291815U CN 202020138483 U CN202020138483 U CN 202020138483U CN 211291815 U CN211291815 U CN 211291815U
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Abstract
The utility model discloses an external self-calibration device of a distributed optical fiber temperature sensing system, which comprises an inner box shell, an outer box shell, sensing optical fibers, a temperature measuring probe, a temperature testing circuit board, a heat-conducting liquid medium and a heat-insulating material; the sensing optical fiber, the temperature measuring probe and the heat-conducting liquid medium are arranged in the inner box shell; the inner box shell, the heat insulation material and the temperature test circuit board are arranged in the outer box shell; the sensing optical fiber is used for acquiring the power of Raman backward scattering optical signals and providing parameter reference values for the subsequent signal processing flow of the distributed optical fiber temperature sensing system; the temperature measuring probe is used for measuring the real-time temperature of the inner box; the temperature test circuit board is used for controlling the temperature measurement probe; the sensing optical fiber and the temperature measuring probe are immersed in the heat-conducting liquid medium; the heat insulating material is filled in the gap between the inner case shell and the outer case shell. The utility model discloses the device is portable, reliable, low-power consumption.
Description
Technical Field
The utility model relates to a distributed optical fiber sensing technology field, especially a distributed optical fiber temperature sensing system's external from calibration arrangement.
Background
In 1928, Indian scientists discovered Raman scattering experimental phenomena, and Raman spectroscopy developed rapidly after the experimental phenomena, especially after laser light appeared, the Raman spectroscopy gradually developed into a conventional spectral measurement means and was gradually applied to the fields of parameter measurement, spectral analysis, optical fiber sensing and the like. The distributed optical fiber temperature sensing system is used for measuring the temperature based on the temperature effect of Raman scattering light, and when incident light enters an optical fiber, photons and molecules act due to the nonuniformity of the refractive index of a fiber core of the optical fiber to generate backward Raman scattering light. The intensity of the backward Raman scattering light is influenced by the ambient temperature of the backward Raman scattering light, so that the temperature field information can be acquired by detecting the intensity change of the power of the Raman scattering light through the photoelectric detector.
From the commercial market perspective, the distributed optical fiber temperature sensing system is an optical fiber sensing product for measuring a space temperature field in real time, which is developed in recent years, the system utilizes the Raman scattering effect and the optical time domain reflection technology to realize distributed measurement of the temperature field where the sensitive optical fiber is located.
Although the academic research of the distributed optical fiber temperature sensing system is relatively mature at present, some practical problems still exist. At present, the problem affecting the practical application of engineering is that each machine of the distributed optical fiber temperature sensing system needs to perform an on-site temperature calibration experiment to provide a temperature reference for the subsequent temperature demodulation process before performing temperature measurement. In the use of the distributed optical fiber temperature sensing system, besides the noise of the system, the accuracy of the calibration parameters is also an important factor influencing the temperature measurement precision of the system. The more accurate the parameter calibration of the system is, the higher the measurement accuracy and temperature measurement accuracy of the system are.
At present, in a temperature calibration experiment of a distributed optical fiber temperature sensing system in a parameter calibration stage, a water bath is generally used for carrying out local constant temperature heating on a part of a system connecting optical fiber, and the heated temperature and the power of a backward raman scattering optical signal in the part of the optical fiber are recorded and provided for subsequent signal processing for temperature demodulation. The conventional method has the disadvantages of difficult operation, difficult repeated operation, and uneven heating of the optical fiber in the constant temperature heating process because of a certain temperature gradient in the water bath, which greatly influences the calibration of parameters. In addition to the above disadvantages, it is very inconvenient to perform such temperature calibration experiments on the site in some application occasions, which brings great difficulty to the site construction. Therefore, in the research of the distributed optical fiber temperature sensing system facing the practical engineering application, the problem of temperature calibration needs to be solved urgently.
At present distributed optical fiber temperature sensing system is in the parameter calibration stage, mainly uses water bath constant temperature heating to carry out the temperature calibration experiment, and the operation is more difficult, be unfavorable for repetitive operation, and water bath is inside to have certain temperature gradient moreover, and optic fibre is heated in the middle of the process of constant temperature heating and is not even, has influenced the calibration of parameter to a great extent.
Disclosure of Invention
The utility model aims to solve the technical problem that overcome prior art not enough and provide a distributing type optic fibre temperature sensing system's external from calibration device, the utility model discloses the device is portable, reliable, low-power consumption.
The utility model discloses a solve above-mentioned technical problem and adopt following technical scheme:
according to the utility model provides an external self-calibration device of a distributed optical fiber temperature sensing system, which comprises an inner box shell, an outer box shell, sensing optical fibers, a temperature measuring probe, a temperature testing circuit board, a heat-conducting liquid medium and a heat-insulating material; wherein:
the sensing optical fiber, the temperature measuring probe and the heat-conducting liquid medium are arranged in the inner box shell;
the inner box shell, the heat insulation material and the temperature test circuit board are arranged in the outer box shell;
the sensing optical fiber is used for acquiring the power of Raman backward scattering optical signals and providing parameter reference values for the subsequent signal processing flow of the distributed optical fiber temperature sensing system;
the temperature measuring probe is used for measuring the real-time temperature of the inner box shell;
the temperature test circuit board is used for controlling the temperature measuring probe, so that the temperature measuring probe finishes temperature reading and data uploading in real time;
the sensing optical fiber and the temperature measuring probe are immersed in the heat-conducting liquid medium;
the heat insulating material is filled in the gap between the inner case shell and the outer case shell.
As a further optimization scheme of the external self-calibration device of the distributed optical fiber temperature sensing system of the present invention, the external self-calibration device further comprises a sensing optical fiber flange interface and a USB interface, wherein the sensing optical fiber flange interface is used for connecting the external self-calibration device of the distributed optical fiber temperature sensing system in series in an optical fiber circuit through a flange; the USB interface is used for supplying power to the external self-calibration device of the distributed optical fiber temperature sensing system and communicating with a computer.
The utility model adopts the above technical scheme to compare with prior art, have following technological effect:
compared with the prior structure, the utility model has smaller volume, which greatly facilitates the operation of the distributed optical fiber temperature sensing system during temperature calibration; the precision is higher, and the temperature measurement error of the temperature sensing probe is smaller; the reliability is higher, the problem that the optical fiber is heated unevenly is solved by using the heat-conducting liquid medium, and the temperature measurement precision and accuracy of the distributed optical fiber temperature sensing system are improved.
Drawings
Fig. 1 is a schematic diagram of an external self-calibration device internal box of a distributed optical fiber temperature sensing system.
FIG. 2 is a schematic diagram of an external self-calibration device casing of the distributed optical fiber temperature sensing system.
FIG. 3 is a schematic diagram of the connection mode of the external self-calibration device of the distributed optical fiber temperature sensing system.
The reference numerals in the figures are to be interpreted: 1-an external self-calibration device inner box shell of a distributed optical fiber temperature sensing system, 2-a sensing optical fiber, 3-a temperature measuring probe, 4-a heat-conducting liquid medium, 5-an external self-calibration device outer box shell of the distributed optical fiber temperature sensing system, 6-a heat insulation material, 7-a temperature testing circuit board, 8-a USB interface, 9-an optical fiber flange interface and 10-the distributed optical fiber temperature sensing system.
Detailed Description
The technical scheme of the utility model is further explained in detail with the attached drawings as follows:
the external self-calibration device of the distributed optical fiber temperature sensing system mainly comprises an outer box shell 5 and an inner box shell 1. The structure of the internal box of the external self-calibration device of the distributed optical fiber temperature sensing system is shown in fig. 1, a temperature measuring probe 3 and a sensing optical fiber 2 which has a certain length and is coiled into a ring shape are packaged in the internal box of the external self-calibration device of the distributed optical fiber temperature sensing system, and the temperature measuring probe and the sensing optical fiber are immersed by using a heat-conducting liquid medium so as to ensure the consistency of the temperature. The internal box of the external self-calibration device of the distributed optical fiber temperature sensing system is also provided with two optical fibers which are led out from the shell part, namely the head part and the tail part of the annular sensing optical fiber, and a connecting wire for the temperature measuring probe and the temperature testing circuit board 7.
When an internal box of an external self-calibration device of the distributed optical fiber temperature sensing system is sealed and stored, the selection of a heat-conducting liquid medium, the selection of a temperature measuring probe and the selection of a shell material and glue are considered. The heat conduction liquid medium 4 is selected by considering heat conductivity coefficient, expansion coefficient and specific heat capacity, the higher the heat conductivity coefficient is, the more beneficial the distributed optical fiber temperature sensing system is, the expansion coefficient determines the filling degree of the heat conduction liquid medium in an external self-calibration device inner box of the distributed optical fiber temperature sensing system, and the specific heat capacity ensures that the temperature calibration is completed within the time that the temperature variation is less than 1 ℃. The temperature measuring probe needs to select a type with high resolution, high temperature measuring precision and simple operation. The shell material and the glue used for fixing are required to achieve the sealing effect and have certain corrosion resistance.
The external self-calibration device of the distributed optical fiber temperature sensing system has an external box structure as shown in fig. 2, the external self-calibration device of the distributed optical fiber temperature sensing system is packaged in the external box of the external self-calibration device of the distributed optical fiber temperature sensing system, and a heat insulation material 6 is used for filling gaps between the external box and the internal box. The external self-calibration device of the distributed optical fiber temperature sensing system is provided with two optical fiber flange interfaces 9 on an outer box shell, and the two optical fiber flange interfaces can be connected to an optical fiber circuit in series. The external self-calibration device of the distributed optical fiber temperature sensing system is provided with a USB interface 8 on an outer box shell, and can supply power and communicate with a computer.
The external self-calibration device of the distributed optical fiber temperature sensing system 10 is specifically used as shown in fig. 3. The external self-calibration device of the distributed optical fiber temperature sensing system is connected with a measuring channel optical fiber flange joint of the distributed optical fiber temperature sensing system and a sensing optical fiber joint of a measuring line in engineering respectively through two optical fiber flange interfaces, and the three form a series connection relation. The USB interface of the external self-calibration device of the distributed optical fiber temperature sensing system is connected with the USB interface on the computer host of the distributed optical fiber temperature sensing system for power supply and communication. The computer host of the distributed optical fiber temperature sensing system sends an instruction through the USB interface, and the external self-calibration device of the distributed optical fiber temperature sensing system reads and uploads the temperature after receiving the instruction.
The utility model discloses an in a concrete embodiment, distributed optical fiber temperature sensing system's external interior outer box shell material from calibration arrangement adopts the ya keli material, sealing glue adopts ya keli glue and AB glue, these materials all can reach sealed effect, and have certain corrosion resisting property, sensing optical fiber has selected 50m single mode fiber, temperature measurement probe has selected model DS18B 20's temperature probe, it has the resolution ratio height, easy operation's characteristics, the temperature measurement precision is 0.5 ℃. heat conduction liquid medium has selected the coefficient of heat conductivity to be 0.466KJ/(m.hr. degree C.), the specific heat capacity is 2.30KJ/(KG. ℃), the coefficient of expansion is 6.38 × 10-4/° C to 7.04 × 10-4Heat conducting oil at/° c. The heat insulation material adopts aluminum film heat insulation cotton, the heat conductivity coefficient of the aluminum film heat insulation cotton is 0.032w/(m.k), the thickness of the aluminum film heat insulation cotton is 0.001m, and the area of the aluminum film heat insulation cotton is 0.03m2. According to the volume of an internal box of the external self-calibration device of the distributed optical fiber temperature sensing system, the volume is 0.00025m3The weight of the heat-conducting liquid medium is 219.5g, so that the temperature calibration can be completed within the time that the temperature change is less than 1 ℃. The temperature test circuit board adopts a single chip microcomputer of model STM32F103C8T6, temperature reading and data uploading of the temperature measurement probe DS18B20 can be completed, the time sequence of temperature measurement adopts an instruction form, an upper computer sends an instruction through a USB interface, the temperature test circuit board receives the instruction, reads the temperature and uploads the temperature, and the temperature test circuit board and the upper computer simultaneously read the temperature and upload the temperatureAnd the upper computer also needs to identify the validity of the data of the uploaded result.
What has been described above and shown in the drawings is merely a preferred embodiment of the invention. Without departing from the principles of the present invention, one of ordinary skill in the art can also make several modifications and improvements, which should also be considered as falling within the scope of the present invention.
Claims (2)
1. An external self-calibration device of a distributed optical fiber temperature sensing system is characterized by comprising an inner box shell, an outer box shell, a sensing optical fiber, a temperature measuring probe, a temperature testing circuit board, a heat-conducting liquid medium and a heat-insulating material; wherein:
the sensing optical fiber, the temperature measuring probe and the heat-conducting liquid medium are arranged in the inner box shell;
the inner box shell, the heat insulation material and the temperature test circuit board are arranged in the outer box shell;
the sensing optical fiber is used for acquiring the power of Raman backward scattering optical signals and providing parameter reference values for the subsequent signal processing flow of the distributed optical fiber temperature sensing system;
the temperature measuring probe is used for measuring the real-time temperature of the inner box shell;
the temperature test circuit board is used for controlling the temperature measuring probe, so that the temperature measuring probe finishes temperature reading and data uploading in real time;
the sensing optical fiber and the temperature measuring probe are immersed in the heat-conducting liquid medium;
the heat insulating material is filled in the gap between the inner case shell and the outer case shell.
2. The external self-calibration device of the distributed optical fiber temperature sensing system according to claim 1, further comprising a sensing optical fiber flange interface and a USB interface, wherein the sensing optical fiber flange interface is used for connecting the external self-calibration device of the distributed optical fiber temperature sensing system in series in an optical fiber circuit through a flange; the USB interface is used for supplying power to the external self-calibration device of the distributed optical fiber temperature sensing system and communicating with a computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020138483.2U CN211291815U (en) | 2020-01-21 | 2020-01-21 | External self-calibration device of distributed optical fiber temperature sensing system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020138483.2U CN211291815U (en) | 2020-01-21 | 2020-01-21 | External self-calibration device of distributed optical fiber temperature sensing system |
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| Publication Number | Publication Date |
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| CN211291815U true CN211291815U (en) | 2020-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020138483.2U Expired - Fee Related CN211291815U (en) | 2020-01-21 | 2020-01-21 | External self-calibration device of distributed optical fiber temperature sensing system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116817175A (en) * | 2023-08-31 | 2023-09-29 | 四川雅韵能源开发有限责任公司 | Liquefied natural gas storage tank monitoring and early warning method based on optical fiber sensing |
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2020
- 2020-01-21 CN CN202020138483.2U patent/CN211291815U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116817175A (en) * | 2023-08-31 | 2023-09-29 | 四川雅韵能源开发有限责任公司 | Liquefied natural gas storage tank monitoring and early warning method based on optical fiber sensing |
| CN116817175B (en) * | 2023-08-31 | 2023-11-14 | 四川雅韵能源开发有限责任公司 | Liquefied natural gas storage tank monitoring and early warning method based on optical fiber sensing |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200818 Termination date: 20210121 |
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| CF01 | Termination of patent right due to non-payment of annual fee |