CN215338637U - Optical fiber sensing system for online temperature measurement of electrolytic aluminum cell - Google Patents
Optical fiber sensing system for online temperature measurement of electrolytic aluminum cell Download PDFInfo
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- CN215338637U CN215338637U CN202121169550.8U CN202121169550U CN215338637U CN 215338637 U CN215338637 U CN 215338637U CN 202121169550 U CN202121169550 U CN 202121169550U CN 215338637 U CN215338637 U CN 215338637U
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Abstract
The utility model provides an optical fiber sensing system for online temperature measurement of an electrolytic aluminum cell. The optical fiber sensing system comprises an optical fiber demodulating system and a plurality of optical fiber sensing heads distributed on the bottom plate of the electrolytic aluminum tank and the cathode point and the radiating hole of each cathode steel bar, wherein the plurality of optical fiber sensing heads are connected in series through a high-temperature conducting optical cable and transmit back scattering or reflecting signals back to the optical fiber demodulating system for temperature signal demodulation; the optical fiber sensing head comprises a sealing shell, a heat conductor packaged in the sealing shell and a high-temperature measurement optical fiber coil wound on the heat conductor, wherein two ends of a high-temperature conduction optical cable connected with two adjacent optical fiber sensing heads in series are sealed and respectively extend into the sealing shell of the two adjacent optical fiber sensing heads and are connected with the high-temperature measurement optical fiber coil wound on the corresponding heat conductor. The utility model realizes the accurate real-time online measurement and characterization of large and dense temperature under extreme conditions such as an electrolytic aluminum cell, and has high measurement precision and good environmental resistance adaptability.
Description
Technical Field
The utility model relates to the field of extreme environment parameter measurement, in particular to an optical fiber type online temperature measurement system in an extreme application environment of an electrolytic aluminum cell.
Background
The optical fiber temperature sensor can realize real-time measurement and positioning of the temperature along an optical fiber link through the reflection or scattering effect of optical signals in optical fibers, has the advantages of all-optical-electricity passivity, strong electricity/strong magnetism/strong radiation interference resistance, single-point/quasi-distributed/distributed measurement, easiness in sensing, transmission, fusion and networking and the like, and has great application potential in extreme industrial application environments such as electrolytic aluminum tanks and the like.
The on-line detection of the temperature of the cathode steel bar of the electrolytic aluminum cell, the on-line detection of the temperature of the heat dissipation holes and the on-line detection of the temperature of the cell bottom plate of the electrolytic aluminum cell are very critical steps for ensuring the safe production of the electrolytic aluminum cell when the electrolytic aluminum cell works in a high-temperature environment of strong electricity (the cathode electrified steel bar is 5000A/4V) for a long time. At present, the online temperature inspection of the electrolytic aluminum cell mainly depends on manual inspection by a manual handheld thermodetector, and the mode is that firstly, the working environment is very severe, and certain personal safety danger exists in a strong electricity high-temperature environment; secondly, the number of the inspection measuring points is huge, the labor intensity of work is high, and accurate, reliable, synchronous, real-time and non-point-leakage measurement is difficult to realize. In order to solve the safety problem of manual inspection, the utility model patent of publication No. CN 108823607A discloses a continuous temperature measurement method for an electrolytic aluminum tank, in which matrix type wireless temperature measurement unit arrays are arranged at the bottom and the key side part of the electrolytic aluminum tank, and the continuous online temperature measurement of the electrolytic aluminum tank is realized through wireless network networking, but the reliability and the service life of the wireless temperature measurement sensor array are very large problems in severe high-temperature environment. The utility model patent with publication number CN 112033566A discloses an aluminum cell distributed optical fiber temperature measurement system, which explains the whole structure composition, the high-temperature optical fiber arrangement mode and the magnetic protection of the temperature measurement system, and provides a very good feasible scheme for the effective monitoring of the temperature in the aluminum electrolysis production operation and operation guidance by the optical fiber sensing technology. However, the technology is designed by an integral scheme, and a detailed design description is not given for a using method of high-precision online measurement of the cathode steel bar temperature, the heat dissipation hole temperature and the cell bottom plate temperature of the front-end optical fiber sensing head in the electrolytic aluminum cell.
Disclosure of Invention
The utility model provides an optical fiber sensing system for online temperature measurement of an electrolytic aluminum cell aiming at the application requirements of online temperature detection of a cathode steel bar of the electrolytic aluminum cell, online temperature detection of a heat dissipation hole and online temperature detection of a cell bottom plate.
In order to achieve the technical purpose, the utility model provides an optical fiber sensing system for online temperature measurement of an electrolytic aluminum cell, which comprises an optical fiber demodulating system and a plurality of optical fiber sensing heads, wherein the optical fiber sensing system comprises the optical fiber demodulating system and the plurality of optical fiber sensing heads which are distributed on a cell bottom plate of the electrolytic aluminum cell and at the cathode point and the radiating hole of each cathode steel bar, and the plurality of optical fiber sensing heads are connected in series through a high-temperature conducting optical cable and transmit back scattering or reflecting signals back to the optical fiber demodulating system for temperature signal demodulation; the optical fiber sensing head comprises a sealing shell, a heat conductor packaged in the sealing shell and a high-temperature measurement optical fiber coil wound on the heat conductor, wherein two ends of a high-temperature conduction optical cable connected with two adjacent optical fiber sensing heads in series are sealed and respectively extend into the sealing shell of the two adjacent optical fiber sensing heads and are connected with the high-temperature measurement optical fiber coil wound on the corresponding heat conductor.
The further technical scheme of the utility model is as follows: the optical fiber demodulation system is a multi-channel demodulation system, can realize the parallel simultaneous demodulation of the multi-channel signals and realize the real-time online monitoring of the temperature of each temperature monitoring point.
The utility model has the following excellent technical scheme: the heat conductor is a cylindrical heat conductor matched with the size of each temperature measuring point in the electrolytic aluminum tank, a coil groove is formed in the cylindrical surface of the heat conductor, a high-temperature measuring optical fiber is wound in the coil groove with certain tension to form a high-temperature measuring optical fiber coil, the high-temperature measuring optical fiber coil is in close contact with the cylindrical heat conductor, and heat conducting glue or heat conducting powder is added to the contact part; protective inert gas is filled in the sealing shell, a magnet sucker is arranged outside the sealing shell, and the sealing shell, the heat conductor and the magnet sucker are in close contact and have good heat conduction characteristics.
The utility model has the following excellent technical scheme: the sealed shell is connected with two input interfaces and output interfaces which are symmetrical up and down or left and right, and the input interfaces and the output interfaces are both composed of a supporting tube and a sealing component; one end of a high-temperature conduction optical cable connected with two adjacent optical fiber sensing heads in series enters the input end optical fiber sensing head sealing shell from a supporting tube of an optical fiber sensing head output interface arranged at the input end of the high-temperature conduction optical cable and is welded with the output end of a high-temperature measurement optical fiber coil of the input end optical fiber sensing head, the other end of the high-temperature conduction optical cable enters the output end optical fiber sensing head sealing shell from the supporting tube of the optical fiber sensing head input interface arranged at the output end of the high-temperature conduction optical cable and is welded with the input end of the high-temperature measurement optical fiber coil of the output end optical fiber sensing head, and the part of the high-temperature conduction optical cable penetrating through the supporting tube is sealed through a sealing component.
The utility model has the following excellent technical scheme: the two cathode points of each cathode steel bar of the electrolytic aluminum cell are provided with optical fiber sensing heads, and a plurality of optical fiber sensing heads are distributed on the cell bottom plate at equal intervals.
The further technical scheme of the utility model is as follows: the high-temperature measurement optical fiber coil selects a single-mode optical fiber or a multi-mode optical fiber or a high-temperature optical fiber grating and an array, and the single-mode optical fiber and the multi-mode optical fiber are provided with polyimide or metal coatings; the multiple optical fiber sensing heads adopt the same high-temperature measurement optical fiber coil or different high-temperature measurement optical fiber coils.
The further technical scheme of the utility model is as follows: the optical fiber demodulation system is distributed Raman optical fiber sensing DTS or distributed Brillouin optical fiber sensing BOTDR/BOTDA; the length of the high-temperature measurement optical fiber coil is greater than the minimum positioning precision of the distributed optical fiber demodulation system.
The utility model has the following excellent technical scheme: the supporting tubes of the input interface and the output interface are welded or screwed to the sealing shell, the middle of the input interface and the output interface is connected with a sealing assembly, the sealing assembly consists of a base, a gasket and a clamping sleeve, and the sealing assembly is sealed and fixed by a sealing gasket and the clamping sleeve.
The diameter of the heat conductor is prepared according to the size of each temperature measuring point, and the length of the optical fiber coil needs to be determined by comprehensively considering the positioning accuracy of a distributed optical fiber demodulation system (such as distributed Raman optical fiber sensing (DTS) or distributed Brillouin optical fiber sensing (BOTDR/BOTDA)), namely the positioning accuracy is usually greater than the minimum positioning accuracy of the system. The high-temperature measuring optical fiber coil is closely contacted with the cylindrical heat conductor, and a certain amount of heat-conducting glue or powder can be added between the high-temperature measuring optical fiber coil and the cylindrical heat conductor in order to increase the heat conduction performance. The service life and the reliability of the high-temperature measuring optical fiber under the high-temperature condition are improved by filling protective inert gas into the sealed shell. Two sealing components which are symmetrical up and down or left and right and a supporting pipe are connected on the sealing shell to be used as an input/output port of the high-temperature conduction optical cable. The sealing assembly ensures that the input/output of the high-temperature conduction optical cable is sealed, and the sealing gasket and the clamping sleeve are used for sealing and fixing, so that the whole seal can meet the application requirements of environment conditions such as application environment temperature, electromagnetic field and the like. A magnet sucker is arranged outside the sealing shell, so that the whole optical fiber sensing head can be conveniently adsorbed on each temperature measuring point of the electrolytic aluminum tank.
The temperature monitoring of the electrolytic aluminum cell generally comprises the temperature on-line detection of cathode points A and B of a cathode steel bar, the temperature on-line detection of a heat dissipation hole and the temperature on-line monitoring of a cell bottom plate. The designed optical fiber sensing head is arranged at the cathode points A and B of the cathode steel bar, the heat dissipation holes and the bottom plate of the electrolytic aluminum cell in a magnet sucker mode according to the requirements of all temperature measuring points of the electrolytic aluminum cell. Each optical fiber sensing head is connected in series through a high-temperature conducting optical cable and transmits back scattering/reflection signals to an optical fiber demodulation system for temperature signal demodulation, so that real-time online monitoring of the temperature of each temperature monitoring point is realized. Meanwhile, the optical fiber demodulation system is a multi-channel demodulation system, and can realize the parallel simultaneous demodulation of the multi-channel signals, thereby realizing the comprehensive integrated application of multiple sensors and reducing the cost of the system.
The conventional long-distance distributed optical fiber sensing system (DTS or BOTDR) is difficult to meet the requirements of the electrolytic aluminum cell in the application scene in the measurement positioning precision (less than or equal to 10cm) and the use environment (less than 200 ℃). The utility model adopts the design of combining the conventional long-distance distributed optical fiber sensing system with the optical fiber temperature measurement protection technology under extreme conditions, can improve the measurement positioning precision (less than or equal to 10cm), the extreme high-temperature use environment (normal temperature-800 ℃), the large-scale integrated use and the high cost performance (compared with a point sensor), and also realizes the large-scale accurate real-time online measurement and characterization of the temperature under extreme conditions of an electrolytic aluminum tank and the like by utilizing the characteristics of optical fiber which is passive in all-optical electricity, high-temperature resistant, strong-intensity-resistant, small in size, convenient for integrated penetration, high in safety, remote transmission and measurement and the like. The design structure has high measurement precision, good environment-resistant adaptability, simple and mature mounting structure, high safety and reliability coefficient, is far away from the severe environment on site, is very suitable for the application in the field of temperature measurement in extreme environments such as an electrolytic aluminum tank and the like, and solves the problems of online temperature detection of the cathode steel bar of the electrolytic aluminum tank, online temperature detection of heat dissipation holes and online temperature detection of the tank bottom plate.
Drawings
FIG. 1 is a schematic diagram of the present invention applied to a system;
FIG. 2 is a transverse cross-sectional view of an optical fiber sensing head of the present invention;
FIG. 3 is a schematic longitudinal cross-sectional view of an optical fiber sensor head of the present invention.
In the figure: 1-optical fiber demodulation system, 2-electrolytic aluminum tank, 3-tank bottom plate, 4-optical fiber sensing head, 5-high temperature conducting optical cable, 400-sealing shell, 401-heat conductor, 402-high temperature measuring optical fiber coil, 403-input interface, 404-output interface, 405-magnet sucker.
Detailed Description
The utility model is further illustrated by the following figures and examples. Fig. 1 to 3 are drawings of embodiments, which are drawn in a simplified manner and are only used for the purpose of clearly and concisely illustrating the embodiments of the present invention. The following claims presented in the drawings are specific to embodiments of the utility model and are not intended to limit the scope of the claimed invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
The embodiment provides an optical fiber sensing system for online temperature measurement of an electrolytic aluminum cell, as shown in fig. 1, the optical fiber sensing system comprises an optical fiber demodulating system 1 and a plurality of optical fiber sensing heads 4 distributed on a cell bottom plate 3 of the electrolytic aluminum cell 2 and cathode points and radiating holes of each cathode steel bar, the optical fiber sensing heads 4 are arranged on A, B two cathode points of each cathode steel bar of the electrolytic aluminum cell 2, and the plurality of optical fiber sensing heads 4 are distributed on the cell bottom plate 3 at equal intervals. Multiple fiber optic sensing heads 4 employ the same pyrometric fiber coil 402 or different pyrometric fiber coils 402. The optical fiber sensing heads 4 are connected in series through the high-temperature conducting optical cable 5, and backward scattering or reflection signals are transmitted back to the optical fiber demodulation system 1 for temperature signal demodulation, so that the real-time online monitoring of the temperature of each temperature monitoring point is realized; two ends of the high temperature conducting optical cable 5 are respectively connected to the input and output ends of the high temperature measuring optical fiber coils 402 of two adjacent optical fiber sensing heads 4. Meanwhile, the optical fiber demodulation system 1 is a multi-channel demodulation system, and can realize the parallel simultaneous demodulation of the multi-channel signals, thereby realizing the comprehensive integrated application of multiple sensors and reducing the cost of the system. The optical fiber demodulation system 1 adopts distributed Raman optical fiber sensing DTS or distributed Brillouin optical fiber sensing BOTDR/BOTDA.
In the embodiment of the optical fiber sensing system for on-line temperature measurement of an electrolytic aluminum cell, as shown in fig. 2 and 3, the optical fiber sensing head 4 includes a cylindrical sealing housing 400, a cylindrical heat conductor 401 packaged in the sealing housing 400, and a high temperature measurement optical fiber coil 402 wound on the heat conductor 401, the diameter of the heat conductor 401 is designed according to the size of each temperature measurement point in the electrolytic aluminum cell, the high temperature measurement optical fiber coil 402 is a single mode optical fiber or a multimode optical fiber or a high temperature optical fiber grating and array, and the single mode optical fiber and the multimode optical fiber are provided with a polyimide or metal coating; the length of the pyrometric fiber coil 402 needs to be determined by comprehensively considering the positioning accuracy of the distributed fiber demodulation system 1 (such as distributed raman fiber sensing DTS or distributed brillouin fiber sensing BOTDR/BOTDA), i.e. it is usually greater than the minimum positioning accuracy of the system, and the design of other sealed sensing structures is not changed. The high-temperature measurement optical fiber coil 402 is closely contacted with the cylindrical heat conductor 401, a coil groove is formed in the cylindrical surface of the heat conductor in order to enable the high-temperature measurement optical fiber coil to be closely contacted, a high-temperature measurement optical fiber with a proper length is wound in the coil groove with a certain tension to form the high-temperature measurement optical fiber coil, and in order to increase the heat conduction performance, heat conduction glue or heat conduction silicone grease or magnesium powder or carbon powder is added at the contact part; protective inert gases such as argon or nitrogen or helium are filled in the sealed shell 400 to improve the service life and reliability of the high-temperature measurement optical fiber coil 402 under the high-temperature condition; the magnet sucking disc 405 is arranged outside the sealing shell 400, so that the whole optical fiber sensing head 2 can be conveniently adsorbed on each temperature measuring point of the electrolytic aluminum tank 1, and the sealing shell 400, the heat conductor 401 and the magnet sucking disc 405 are in close contact and have good heat conduction characteristics. The sealed shell 400 is connected with two input interfaces 403 and two output interfaces 404 which are symmetrical up and down or left and right, the input interfaces 403 and the output interfaces 404 are both composed of supporting tubes and sealing components, the supporting tubes of the input interfaces 403 and the output interfaces 404 are welded or screwed to the sealed shell 400, the sealing components are connected in the middle and are composed of a base, a gasket and a sleeve chuck, sealing and fixing are carried out by utilizing a sealing gasket and the sleeve chuck, the input/output of the high-temperature conduction optical cable 5 is ensured to be sealed, sealing and fixing are carried out by utilizing the sealing gasket and the sleeve chuck, and the whole sealing can meet the application requirements of environment conditions such as application environment temperature, electromagnetic field and the like. One end of the high-temperature conduction optical cable 5 of two adjacent optical fiber sensing heads 4 in series enters the input end optical fiber sensing head sealing shell from the supporting tube of the optical fiber sensing head output interface 404 arranged at the input end of the high-temperature conduction optical cable and is welded with the output end of the high-temperature measurement optical fiber coil 402 of the input end optical fiber sensing head, the other end of the high-temperature conduction optical cable 5 enters the output end optical fiber sensing head sealing shell from the supporting tube of the optical fiber sensing head input interface 403 arranged at the output end of the high-temperature conduction optical cable and is welded with the input end of the high-temperature measurement optical fiber coil 402 of the output end optical fiber sensing head, and the part of the high-temperature conduction optical cable 5 penetrating through the supporting tube is sealed through a sealing component. The conducting optical fiber extends into the sealing shell and is welded with the high-temperature measuring optical fiber, so that the long-term reliability of the optical cable at high temperature can be ensured, and the welding mode can avoid the influence of end face reflection.
The utility model respectively adsorbs the designed optical fiber sensing head 4 to the cathode points A and B of the cathode steel bar, the heat dissipation holes and the position of the cell bottom plate 3 to be subjected to temperature monitoring according to the requirements of all temperature measuring points of the electrolytic aluminum cell 1. Each optical fiber sensing head 4 is connected in series through a high-temperature conducting optical cable 5, and transmits back scattering/reflection signals to the optical fiber demodulation system 1 for temperature signal demodulation, so that real-time online monitoring of the temperature of each temperature monitoring point is realized. Meanwhile, the optical fiber demodulation system 1 is a multi-channel demodulation system, and can realize the parallel simultaneous demodulation of the multi-channel signals, thereby realizing the comprehensive integrated application of multiple sensors and reducing the cost of the system; according to the application requirements of measurement precision and positioning, the high-temperature measurement optical fiber in the optical fiber sensing head generally adopts a special single-mode or multi-mode optical fiber with a polyimide or metal coating, and can also be replaced by a high-temperature optical fiber grating and an array; in order to better meet the application requirements of the measurement precision and positioning of the electrolytic aluminum cell and the cost performance coefficient of the whole system, the temperature measurement of the cathode points A and B of the cathode steel bar, the heat dissipation holes and the cell bottom plate 3 can adopt two different high-temperature measurement optical fibers for cross use.
The above description is only one embodiment of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (8)
1. An optical fiber sensing system for online temperature measurement of an electrolytic aluminum cell is characterized in that: the optical fiber sensing system comprises an optical fiber demodulating system (1) and a plurality of optical fiber sensing heads (4) distributed on a tank bottom plate (3) of the electrolytic aluminum tank (2) and at the cathode point and the radiating hole of each cathode steel bar, wherein the plurality of optical fiber sensing heads (4) are connected in series through a high-temperature conducting optical cable (5) and transmit back scattering or reflecting signals back to the optical fiber demodulating system (1) for temperature signal demodulation; the optical fiber sensing head (4) comprises a sealing shell (400), a heat conductor (401) packaged in the sealing shell (400) and a high-temperature measurement optical fiber coil (402) wound on the heat conductor (401), wherein two ends of a high-temperature conduction optical cable (5) of two adjacent optical fiber sensing heads (4) connected in series are sealed and respectively extend into the sealing shell (400) of the two adjacent optical fiber sensing heads (4), and are connected with the high-temperature measurement optical fiber coil (402) wound on the corresponding heat conductor (401).
2. The optical fiber sensing system for the on-line temperature measurement of the electrolytic aluminum cell as claimed in claim 1, wherein: the optical fiber demodulation system (1) is a multi-channel demodulation system, and can realize the parallel simultaneous demodulation of the multi-channel signals and the real-time online monitoring of the temperature of each temperature monitoring point.
3. The optical fiber sensing system for the on-line temperature measurement of the electrolytic aluminum cell as claimed in claim 1 or 2, wherein: the heat conductor (401) is a cylindrical heat conductor matched with the size of each temperature measuring point in the electrolytic aluminum tank, a coil groove is formed in the cylindrical surface of the heat conductor, a high-temperature measuring optical fiber is wound in the coil groove with certain tension to form a high-temperature measuring optical fiber coil (402), the high-temperature measuring optical fiber coil (402) is in close contact with the cylindrical heat conductor (401), and heat conducting glue or heat conducting powder is added to the contact part; protective inert gas is filled in the sealed shell (400), a magnet sucker (405) is arranged outside the sealed shell (400), and the sealed shell (400), the heat conductor (401) and the magnet sucker (405) are in close contact and have good heat conduction characteristics.
4. The optical fiber sensing system for the on-line temperature measurement of the electrolytic aluminum cell as claimed in claim 1 or 2, wherein: the sealed shell (400) is connected with two input interfaces (403) and two output interfaces (404) which are symmetrical up and down or left and right, and the input interfaces (403) and the output interfaces (404) are both formed by supporting tubes and sealing components; one end of a high-temperature conduction optical cable (5) serially connected with two adjacent optical fiber sensing heads (4) enters the input end optical fiber sensing head sealing shell from a supporting tube of an optical fiber sensing head output interface (404) arranged at the input end of the high-temperature conduction optical cable, and is welded with the output end of a high-temperature measurement optical fiber coil (402) of the input end optical fiber sensing head, the other end of the high-temperature conduction optical cable enters the output end optical fiber sensing head sealing shell from a supporting tube of an optical fiber sensing head input interface (403) arranged at the output end of the high-temperature conduction optical cable, and is welded with the input end of the high-temperature measurement optical fiber coil (402) of the output end optical fiber sensing head, and the part of the high-temperature conduction optical cable (5) penetrating through the supporting tube is sealed through a sealing component.
5. The optical fiber sensing system for the on-line temperature measurement of the electrolytic aluminum cell as claimed in claim 1 or 2, wherein: optical fiber sensing heads (4) are arranged on two cathode points of each cathode steel bar of the electrolytic aluminum tank (2), and a plurality of optical fiber sensing heads (4) are equidistantly distributed on the tank bottom plate (3).
6. The optical fiber sensing system for the on-line temperature measurement of the electrolytic aluminum cell as claimed in claim 1 or 2, wherein: the high-temperature measurement optical fiber coil (402) selects a single-mode optical fiber or a multi-mode optical fiber or a high-temperature optical fiber grating and an array, and the single-mode optical fiber and the multi-mode optical fiber are provided with polyimide or metal coatings; the multiple fiber sensing heads (4) employ the same pyrometric fiber coil (402) or different pyrometric fiber coils (402).
7. The optical fiber sensing system for the on-line temperature measurement of the electrolytic aluminum cell as claimed in claim 2, wherein: the optical fiber demodulation system (1) is a distributed Raman optical fiber sensing DTS or a distributed Brillouin optical fiber sensing BOTDR/BOTDA; the length of the high-temperature measurement optical fiber coil (402) is larger than the minimum positioning precision of the distributed optical fiber demodulation system (1).
8. The optical fiber sensing system for the on-line temperature measurement of the electrolytic aluminum cell as claimed in claim 4, wherein: the supporting pipes of the input interface (403) and the output interface (404) are welded or screwed to the sealing shell (400), the middle of the input interface and the output interface is connected with a sealing assembly, the sealing assembly consists of a base, a gasket and a clamping sleeve, and the sealing assembly is sealed and fixed by a sealing gasket and the clamping sleeve.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113865743A (en) * | 2021-10-13 | 2021-12-31 | 广东感芯激光科技有限公司 | Optical fiber distributed battery multipoint temperature measurement system and application |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113865743A (en) * | 2021-10-13 | 2021-12-31 | 广东感芯激光科技有限公司 | Optical fiber distributed battery multipoint temperature measurement system and application |
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