CN220206870U - Pre-buried temperature sensor - Google Patents
Pre-buried temperature sensor Download PDFInfo
- Publication number
- CN220206870U CN220206870U CN202321589594.5U CN202321589594U CN220206870U CN 220206870 U CN220206870 U CN 220206870U CN 202321589594 U CN202321589594 U CN 202321589594U CN 220206870 U CN220206870 U CN 220206870U
- Authority
- CN
- China
- Prior art keywords
- pressure head
- optical fiber
- substrate
- fiber sleeve
- groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000758 substrate Substances 0.000 claims abstract description 109
- 239000013307 optical fiber Substances 0.000 claims abstract description 103
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 239000000835 fiber Substances 0.000 abstract description 24
- 238000005259 measurement Methods 0.000 abstract description 14
- 238000012544 monitoring process Methods 0.000 abstract description 9
- 238000001514 detection method Methods 0.000 abstract description 5
- 239000011521 glass Substances 0.000 abstract description 3
- 230000003647 oxidation Effects 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 238000003825 pressing Methods 0.000 description 30
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005288 electromagnetic effect Effects 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 230000008376 long-term health Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Optical Transform (AREA)
Abstract
The utility model discloses a pre-buried temperature sensor, which relates to the field of detection of fiber bragg grating temperature sensors and aims to solve the problems of poor electromagnetic interference resistance, easy damage or zero drift in severe environments and short measurement distance in the prior art, and the pre-buried temperature sensor comprises a shell, a waterproof connector, an optical fiber sleeve and grating optical fibers, wherein the two ends of the shell are connected with the waterproof connector; an optical fiber sleeve pressure head and a substrate pressure head are arranged in the shell, the two waterproof connectors are respectively connected with the optical fiber sleeve pressure head and the substrate pressure head, and the substrate pressure head is connected with a substrate; the optical fiber sleeve pressure head and the substrate pressure head are respectively internally provided with an optical fiber sleeve, the optical fiber sleeve is internally provided with a grating optical fiber, and the substrate is connected with the grating optical fiber. The structure is suitable for temperature monitoring in severe environments. The temperature substrate is special glass solid-state package, has the advantages of long service life, oxidation resistance, fatigue resistance and difficult detachment, and has strong electromagnetic interference resistance, long measurement distance and no zero drift.
Description
Technical Field
The utility model relates to the field of detection of fiber bragg grating temperature sensors, in particular to a novel pre-buried substrate type fiber bragg grating temperature sensor.
Background
The temperature is one of the most important and basic physical quantities to be monitored in various large fields, plays a vital role in completing various production and engineering, most of temperature sensors adopted in the traditional temperature measuring device are realized by converting temperature variables into electric signals based on electromagnetic effect, capacitance effect and the like, and although higher precision and resolution can be achieved during measurement, the weak current sensor has the defects of poor electromagnetic interference resistance, easy damage or zero drift occurrence in severe environments and near measurement distance in long-term use, and is difficult to meet the current monitoring requirements in the aspects of continuity, instantaneity, measurement sensitivity and the like, which definitely brings great inconvenience to basic engineering measurement.
The fiber Bragg grating has the advantages of high measurement sensitivity, strong waterproof performance, electromagnetic interference resistance, long signal transmission distance and corrosion resistance, and can be used for long-term health monitoring of objects, spaces and environments to be measured. The fiber bragg grating temperature sensor can be used as a temperature sensor alone and can be connected with matched accessories in series, such as an inclination angle sensor, a pressure sensor, a humidity sensor, a displacement sensor and the like, and can be used as temperature compensation accessories of the matched sensors to form a distributed sensing network, a feasible way is provided for realizing process monitoring, environment monitoring and safety monitoring and early warning, but when the traditional fiber bragg grating temperature sensor works in severe environments such as subway tunnels, dams, farmlands and mines, the sensing element of the sensor is easy to oxidize or inelastically deform, even degumm and lose efficacy, and therefore, the conditions such as low measurement accuracy or measurement failure are caused.
Therefore, it is necessary to provide a novel substrate-type fiber grating temperature sensor capable of being embedded to solve the above technical problems.
Disclosure of Invention
In view of the problems of poor electromagnetic interference resistance, easy damage or zero drift in severe environment for long-term use, short measurement distance and the like existing in the prior art, the utility model discloses a pre-buried temperature sensor.
The technical scheme is that the waterproof optical fiber comprises a shell, a waterproof connector, an optical fiber sleeve and a grating optical fiber, wherein two ends of the shell are connected with the waterproof connector, and an O-shaped ring is arranged on the waterproof connector, so that a good waterproof effect can be achieved; an optical fiber sleeve pressure head and a substrate pressure head are arranged in the shell, the two waterproof connectors are respectively connected with the optical fiber sleeve pressure head and the substrate pressure head, and the substrate pressure head is connected with a substrate; the optical fiber sleeve is arranged in the optical fiber sleeve pressure head and the substrate pressure head, the grating optical fiber is arranged in the optical fiber sleeve, the steel armor protection sleeve is arranged outside the optical fiber sleeve, the optical fiber sleeve and the grating optical fiber in the optical fiber sleeve can be protected, and the substrate is connected with the grating optical fiber.
As a preferable technical scheme of the utility model, the inner walls of the two ends of the shell are provided with first threads, the waterproof joint is in threaded connection with the shell, and the problem of degumming can be solved by adopting threaded connection.
As a preferable technical scheme of the utility model, a straight pipe is arranged in the middle, and a first round platform is arranged between the first thread and the straight pipe; the optical fiber sleeve pressure head and the substrate pressure head are both in a circular truncated cone shape, the smaller diameter end of the optical fiber sleeve pressure head is opposite to the smaller diameter end of the substrate pressure head, and the optical fiber sleeve pressure head and the substrate pressure head are fixedly extruded through the waterproof connector by adopting the circular truncated cone-shaped butt joint structure and are stably connected under the action of extrusion force.
As a preferable technical scheme of the utility model, the optical fiber sleeve pressure head further comprises an optical fiber upper pressure head and an optical fiber lower pressure head, wherein the optical fiber upper pressure head and the optical fiber lower pressure head are both semicircular tables, a clamping spring piece is arranged on the substrate lower pressure head, a first through groove is formed in one side of the optical fiber upper pressure head, opposite to the optical fiber lower pressure head, and the optical fiber sleeve is connected in the first groove. The optical fiber lower pressure head can be connected through the clamping spring piece, and the first groove can be used for accommodating the optical fiber sleeve.
As a preferable technical scheme of the utility model, the substrate pressure head further comprises a substrate upper pressure head and a substrate lower pressure head, the substrate upper pressure head and the substrate lower pressure head are semicircular tables and comprise cambered surfaces and trapezoid planes, a second groove is formed in the large circular surface of the substrate upper pressure head and communicated with the trapezoid planes of the substrate upper pressure head, the optical fiber sleeve is connected in the second groove, a first square inclined groove is formed in the small circular surface of the substrate upper pressure head, and the first square inclined groove extends along the surface on the cambered surface of the substrate upper pressure head.
As a preferable technical scheme of the utility model, a second square inclined groove is formed on the small round surface of the substrate lower pressure head, and extends along the surface on the cambered surface of the substrate lower pressure head; the trapezoid plane of the substrate lower pressure head is provided with a third groove, the trapezoid plane is provided with a first boss, the substrate is arranged in the third groove, and the first boss is connected with the trapezoid plane of the substrate upper pressure head.
As a preferable technical scheme of the utility model, the clamping spring piece is of a U-shaped structure, and two ends of the clamping spring piece are respectively connected with the first square inclined groove of the upper pressure head of the substrate and the second square inclined groove of the lower pressure head of the substrate.
As a preferable technical scheme of the utility model, the substrate is of a strip sheet structure, the end part is of an anti-disengagement design, and solid packaging is adopted between the substrate and the grating section of the grating fiber.
The utility model has the beneficial effects that: according to the utility model, the waterproof connectors are connected with the two ends of the shell through threads, the waterproof connectors extrude the optical fiber sleeve pressure head and the substrate pressure head, the optical fiber sleeve pressure head is connected with the optical fiber sleeve, the optical fiber sleeve is internally provided with the grating optical fiber, the substrate pressure head is connected with the substrate, and the substrate is connected with the grating optical fiber. The method is suitable for monitoring the temperature of severe environments such as subway tunnels, dams, farmlands, mines and the like. The temperature substrate is special glass solid-state package, and has the advantages of long service life, oxidation resistance, fatigue resistance and difficult detachment.
Furthermore, the detection process does not use electric energy, is an intrinsically safe sensor, has strong electromagnetic interference resistance, can be used for a long time in a severe environment, is not easy to damage, has long measurement distance, can meet the current monitoring requirements in the aspects of continuity, instantaneity, measurement sensitivity and the like, and does not have zero drift.
Furthermore, the shell is made of stainless steel, the connecting position is fully sealed by adopting O-shaped ring sealing, and the anti-corrosion capability and the full high-efficiency heat conduction are further improved while the substrate is protected.
Furthermore, the sensor adopts a miniaturized design, and the occupied space is small. The sensor can be fixed on a measured object, pre-buried in the measured object or placed, the monitoring substrate is fixed firmly, the sensor has certain shock resistance, the sensor is convenient and quick to install and use, high-efficiency and wide in applicable environment, and the sensor installation success rate and the construction installation efficiency are improved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below; throughout the drawings, the elements or portions are not necessarily drawn to actual scale.
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic diagram of the internal structure of the present utility model;
FIG. 3 is a schematic top view of the interior of the present utility model;
FIG. 4 is a schematic view of the structure of the housing of the present utility model;
FIG. 5 is a schematic view of a substrate structure according to the present utility model;
FIG. 6 is a schematic diagram of the structure of an upper pressure head of an optical fiber according to the present utility model;
FIG. 7 is a schematic diagram of a indenter configuration on a substrate in accordance with the present utility model;
FIG. 8 is a schematic diagram of a lower pressure head structure of a substrate according to the present utility model;
FIG. 9 is a schematic diagram of a lower pressure head structure of a substrate according to the present utility model;
FIG. 10 is a schematic of a wavelength linear fit of the present utility model.
In the figure: 1. a housing; 101. a first thread; 102. a first round table; 2. a waterproof joint; 3. steel armour protective sleeve; 4. an optical fiber ferrule; 5. a grating fiber; 6. an optical fiber ferrule indenter; 6-1, an optical fiber upper pressure head; 6-101, a first groove; 6-2, an optical fiber lower pressure head; 7. a substrate indenter; 7-1, a pressure head on the substrate; 7-101, a second groove; 7-102, a first square inclined groove; 7-2, a substrate pressing head; 7-201, a second square inclined groove; 7-202, a third groove; 7-203, a first boss; 7-3, clamping the spring piece; 8. a substrate.
Detailed Description
Example 1
As shown in fig. 1 to 10, the utility model discloses a pre-buried temperature sensor, the technical scheme adopted by the utility model is that, as shown in fig. 1 and 4, the pre-buried temperature sensor comprises a shell 1, the shell 1 is of a cylindrical tubular structure, in order to prevent degumming, and simultaneously, in order to seal interfaces and protect sensing elements, the inner walls of two ends of the shell 1 are provided with first threads 101, the first threads 101 are connected with a waterproof joint 2, as shown in fig. 2 and 3, the shell 1 is internally provided with grating optical fibers 5, in order to protect the grating optical fibers 5, the outer part of the optical fiber sleeve 4 is sleeved with an optical fiber sleeve 4, the outer part of the optical fiber sleeve 4 is sleeved with a steel armor protective sleeve 3, the waterproof joint 2 locks the steel armor protective sleeve 3, in order to fix the optical fiber sleeve 4, and simultaneously, a substrate 8 is conveniently arranged, an optical fiber sleeve pressure head 6 and a substrate pressure head 7 are also arranged in the shell 2, as shown in fig. 6 to 9, the optical fiber ferrule pressing head 6 and the substrate pressing head 7 are both in a shape of a circular table, a first circular table 102 attached to the circular table surface is arranged at the inner end of a first thread 101 in the corresponding housing 1, the optical fiber ferrule pressing head 6 and the substrate pressing head 7 are both in a shape of a small circular surface facing into the housing 1, the optical fiber ferrule pressing head 6 also comprises an optical fiber upper pressing head 6-1 and an optical fiber lower pressing head 6-2, the optical fiber upper pressing head 6-1 and the optical fiber lower pressing head 6-2 are both in a shape of a semicircular table, a first groove 6-101 is formed on the bottom plane of the optical fiber upper pressing head 6-1 for accommodating the optical fiber ferrule 4, the optical fiber ferrule 4 is clamped up and down by the optical fiber upper pressing head 6-1 and the optical fiber lower pressing head 6-2 in the first groove 6-101, the waterproof connector 2 is sleeved outside the optical fiber ferrule pressing head 6 due to the circular table shape of the optical fiber ferrule pressing head 6, in the process of screwing the waterproof connector 2, the optical fiber upper pressure head 6-1 and the optical fiber lower pressure head 6-2 clamp the optical fiber sleeve 4 along with the pressing of the waterproof connector 2 on the optical fiber sleeve pressure head 6; the substrate pressing head 7 further comprises a substrate upper pressing head 7-1 and a substrate lower pressing head 7-2, the substrate upper pressing head 7-1 and the substrate lower pressing head 7-2 are both in a semicircular table shape, the substrate upper pressing head 7-1 is provided with a second groove 7-101 for accommodating the optical fiber sleeve 4, the structure and the principle of the second groove are the same as those of the first groove 6-101, the third groove 7-202 is formed in a trapezoid plane of the top surface of the substrate lower pressing head 7-2 for installing the substrate 8, the substrate 8 is arranged in the third groove 7-202, and in order to prevent the substrate 8 from falling out, an anti-falling design is adopted, specifically, as shown in fig. 5 and 9, the third groove 7-202 is a T-shaped groove, and the substrate 8 is a T-shaped plate. In order to clamp the substrate 8, a first square inclined groove 7-102 and a second square inclined groove 7-201 are respectively formed at one end of a small round surface of the outer side surface of the substrate upper pressing head 7-1 and one end of a small round surface of the substrate lower pressing head 7-2, a clamping spring piece 7-3 with a U-shaped structure is arranged between the first square inclined groove 7-102 and the second square inclined groove 7-201, and in order to prevent lever force when the waterproof connector 2 presses the substrate pressing head 7, a first concave table 7-203 is arranged at one end of a large round surface of a trapezoid plane at the top of the substrate lower pressing head 7-2 and is propped against the substrate upper pressing head 7-1.
The substrate 8 and the grating section of the grating fiber 5 are packaged in a solid packaging mode.
After the sensor is processed, calibration of the temperature variation and the wavelength variation is performed to generate a fitting curve, as shown in fig. 10, the initial wavelength and the ambient temperature are recorded after the sensor is installed, the strain variation can be obtained by carrying the measurement into a fitting formula according to the measurement, and zero drift phenomenon does not exist. The sensor core component is better in protection, and the sensor installation success rate and the construction installation efficiency are improved. All the shells and the measuring elements are made of inorganic materials, and the electromagnetic interference resistance, super-long service life and long-term detection are realized.
The working principle of the utility model is as follows: a substrate 8 is arranged in the shell 1, and grating fibers 5 at two ends are sleeved with a fiber sleeve 4 after the substrate 8 is packaged; firstly, a substrate 8 and one end of an optical fiber sleeve 4 are preliminarily fixed by using a clamping spring piece 7-3 of a substrate pressure head 7, then the substrate and one end of the optical fiber sleeve 4 are placed in a shell 1, the substrate 8 and one end of the optical fiber sleeve 4 are fixedly extruded and fastened by using a waterproof connector 2 and a first round table 102 in a matched mode, the optical fiber sleeve 4 slightly extrudes a grating optical fiber 5 through extrusion force, and the substrate 8 is suspended and is not influenced by external force and stably installed and has certain anti-seismic performance. The other side of the grating fiber 5 is provided with a fiber pressing head which is placed in the shell 1 to preliminarily fix the grating fiber and the fiber sleeve 4, the waterproof joint 2 is matched with the first round table 102 to fixedly press and fasten the fiber sleeve 4 at the other end, and the fiber sleeve 4 slightly presses the grating fiber 5 through the pressing force. The waterproof joints at the sensor are all made of inorganic metal materials, the substrate 8 and the shell 1 are in metal tight contact, the heat conduction efficiency is high, and when the outside temperature changes, the substrate 8 and the packaged grating expand with heat and contract with cold. So that the wavelength of the fiber bragg grating changes regularly.
The utility model relates to a special glass and a solid packaging mode which are both in the prior art, and particularly can refer to a vacuum packaged fiber bragg grating inclination sensor, a manufacturing method and application thereof, and a preparation device and a preparation method of a fiber bragg grating sensitive substrate of Chinese patent CN 114985208A.
The literature references on fiber grating temperature variation, sensitivity, etc. are:
fang Zujie Qin Guangen Qu Ronghui Cai Haiwen optical fiber sensor base Beijing: scientific press, 2013:115-207;
rao Yunjiang Wang Yiping Zhu Tao fiber bragg grating principle and application: science publishers, first edition 8 2006: page 6, paragraph 1.3.
The detection of the assembled connection grating is a common method adopted by the person skilled in the art, and the technical teaching can be obtained through limited tests, which belongs to common general knowledge.
The components not described in detail herein are prior art.
Although the specific embodiments of the present utility model have been described in detail, the present utility model is not limited to the above embodiments, and various changes and modifications without inventive labor may be made within the scope of the present utility model without departing from the spirit of the present utility model, which is within the scope of the present utility model.
Claims (8)
1. An embedded temperature sensor, which is characterized in that: the optical fiber connector comprises a shell (1), a waterproof connector (2), an optical fiber sleeve (4) and a grating optical fiber (5), wherein two ends of the shell (1) are connected with the waterproof connector (2); an optical fiber sleeve pressure head (6) and a substrate pressure head (7) are arranged in the shell (1), the two waterproof connectors (2) are respectively connected with the optical fiber sleeve pressure head (6) and the substrate pressure head (7), and the substrate pressure head (7) is connected with a substrate (8); the optical fiber sleeve is characterized in that the optical fiber sleeve pressure head (6) and the substrate pressure head (7) are internally provided with the optical fiber sleeve (4), the optical fiber sleeve (4) is internally provided with the grating optical fiber (5), the outside is provided with the steel armor protective sleeve (3), and the substrate (8) is connected with the grating optical fiber (5).
2. A pre-buried temperature sensor according to claim 1, characterized in that: the waterproof connector is characterized in that first threads (101) are formed in the inner walls of two ends of the shell (1), and the waterproof connector (2) is in threaded connection with the shell (1).
3. A pre-buried temperature sensor according to claim 2, characterized in that: a straight pipe is arranged in the middle of the shell (1), and a first round table (102) is arranged between the first thread (101) and the straight pipe; the optical fiber sleeve pressure head (6) and the substrate pressure head (7) are in a round table shape, and the smaller diameter end of the optical fiber sleeve pressure head (6) is opposite to the smaller diameter end of the substrate pressure head (7).
4. A pre-buried temperature sensor according to claim 3, characterized in that: the optical fiber sleeve pressure head (6) further comprises an optical fiber upper pressure head (6-1) and an optical fiber lower pressure head (6-2), the optical fiber upper pressure head (6-1) and the optical fiber lower pressure head (6-2) are semicircular, a through first groove (6-101) is formed in one side of the optical fiber upper pressure head (6-1) opposite to the optical fiber lower pressure head (6-2), and the optical fiber sleeve (4) is connected in the first groove (6-101).
5. A pre-buried temperature sensor according to claim 3, characterized in that: the substrate pressure head (7) further comprises a substrate upper pressure head (7-1) and a substrate lower pressure head (7-2), the substrate upper pressure head (7-1) and the substrate lower pressure head (7-2) are semi-circular tables, the substrate lower pressure head (7-2) is provided with a clamping spring piece (7-3) which comprises an arc surface and a trapezoid plane, the large circular surface of the substrate upper pressure head (7-1) is provided with a second groove (7-101), the second groove (7-101) is communicated with the trapezoid plane of the substrate upper pressure head (7-1), the optical fiber sleeve (4) is connected in the second groove (7-101), the small circular surface of the substrate upper pressure head (7-1) is provided with a first square inclined groove (7-102), and the first square inclined groove (7-102) extends along the surface on the arc surface of the substrate upper pressure head (7-1).
6. The embedded temperature sensor of claim 5, wherein: the small round surface of the substrate lower pressure head (7-2) is provided with a second square inclined groove (7-201), and the second square inclined groove (7-201) extends along the surface on the cambered surface of the substrate lower pressure head (7-2); a third groove (7-202) is formed in the trapezoid plane of the substrate lower pressure head (7-2), a first boss (7-203) is arranged on the trapezoid plane, the substrate (8) is arranged in the third groove (7-202), and the first boss (7-203) is connected with the trapezoid plane of the substrate upper pressure head (7-1).
7. The embedded temperature sensor of claim 6, wherein: the clamping spring piece (7-3) is of a U-shaped structure, and two ends of the clamping spring piece are respectively connected with the first square inclined groove (7-102) of the substrate upper pressure head (7-1) and the second square inclined groove (7-201) of the substrate lower pressure head (7-2).
8. A pre-buried temperature sensor according to claim 1 or 6, characterized in that: and solid packaging is adopted between the substrate (8) and the grating section of the grating optical fiber (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321589594.5U CN220206870U (en) | 2023-06-21 | 2023-06-21 | Pre-buried temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321589594.5U CN220206870U (en) | 2023-06-21 | 2023-06-21 | Pre-buried temperature sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220206870U true CN220206870U (en) | 2023-12-19 |
Family
ID=89142604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321589594.5U Active CN220206870U (en) | 2023-06-21 | 2023-06-21 | Pre-buried temperature sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220206870U (en) |
-
2023
- 2023-06-21 CN CN202321589594.5U patent/CN220206870U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201535667U (en) | Double tube fiber Bragg grating strain sensor insensitive to temperature change | |
| CN203163913U (en) | Diaphragm type fiber bragg grating pressure sensor with temperature compensation | |
| CN104596661A (en) | Temperature-measuring armored thermocouple | |
| CN102620869A (en) | Towing force sensor for fiber bragg grating | |
| CN220206870U (en) | Pre-buried temperature sensor | |
| CN112903131A (en) | High-protection multifunctional explosion-proof temperature measuring device and manufacturing method thereof | |
| CN106768453A (en) | plug-in temperature sensor | |
| CN201408093Y (en) | Double-tube type optical fiber Bragg grating temperature sensor insensitive to external stress strain | |
| CN115603245B (en) | Intelligent bellows | |
| CN215677405U (en) | High-precision pressure sensor | |
| CN202209975U (en) | Floater-type fiber liquid level meter | |
| CN102288261B (en) | Floating pontoon type fiber liquid level meter | |
| CN211576419U (en) | Pressure sensor with thermal stress resistance function | |
| CN210741697U (en) | Special temperature sensor for coal mine industry | |
| CN220871943U (en) | Soil pressure sensor of substrate type fiber bragg grating | |
| CN218765646U (en) | Temperature sensor protection tube | |
| CN202710220U (en) | Fiber grating tension sensor | |
| CN112781750A (en) | Thermal resistor temperature sensor for nuclear power plant | |
| CN219369008U (en) | Variable-range fiber grating pressure sensor | |
| CN216116505U (en) | Hydraulic pressure type pressure gauge protector | |
| CN219829781U (en) | Tensile surface-mounted fiber bragg grating strain sensor | |
| CN109780357B (en) | External pressure type expansion joint with axial displacement detection device | |
| CN217502239U (en) | Nut component | |
| CN114018470B (en) | Pressure measuring sensor incapable of leaving high temperature area and processing method thereof | |
| CN216815782U (en) | Novel temperature switch sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |