CN113280943A - Temperature sensor based on optical fiber - Google Patents
Temperature sensor based on optical fiber Download PDFInfo
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- CN113280943A CN113280943A CN202110758689.4A CN202110758689A CN113280943A CN 113280943 A CN113280943 A CN 113280943A CN 202110758689 A CN202110758689 A CN 202110758689A CN 113280943 A CN113280943 A CN 113280943A
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- optical fiber
- temperature sensor
- cavity
- ferrous metal
- thermocouple
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/12—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance
- G01K11/14—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance of inorganic materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention relates to an optical fiber-based temperature sensor, which comprises a light pipe, a non-ferrous metal ion solution and a thermocouple, wherein the light pipe is arranged on the outer side of the non-ferrous metal ion solution; the light guide pipe is provided with a cavity, and the non-ferrous metal ion solution is arranged in the cavity; the thermocouple comprises a part arranged in the light guide tube and a part arranged outside the light guide tube which are connected with each other; the part of the thermocouple arranged in the light guide tube passes through the cavity to be in contact with the non-ferrous metal ion solution. The invention converts the temperature signal into thermal electromotive force, the non-ferrous metal ions can move in the solution due to the change of charge distribution caused by the thermal electromotive force, and the color distribution of the non-ferrous metal ion solution is changed, and the invention has extremely high detection sensitivity because the light is extremely sensitive to different color distributions and color changes.
Description
Technical Field
The invention relates to the technical field of temperature detection, in particular to a temperature sensor based on optical fibers.
Background
Temperature is a physical quantity representing the degree of cooling and heating of an object, and microscopically, the intensity of thermal motion of molecules of the object. The temperature can only be measured indirectly by some characteristic of the object that changes with temperature, and a scale used to measure the temperature value of the object is called a temperature scale. The cold and hot levels are measured on one of several arbitrary scales based on some observable phenomenon (e.g., expansion of the mercury column). Temperature is a manifestation of the kinetic energy of intermolecular translation within a body. The faster the molecular motion, i.e. the higher the temperature, the hotter the object; the slower the molecular motion, i.e., the lower the temperature, the cooler the object. From the viewpoint of molecular motion theory, temperature is a mark of the average kinetic energy of the molecular motion of an object, and temperature is the collective expression of the thermal motion of molecules and has statistical significance. The detection temperature is an extremely important parameter standard in all aspects of daily life, industrial production and scientific research of people, and the proper temperature can improve the efficiency of industrial production and scientific research, so that the temperature detection control is very important.
The conventional temperature sensor is generally complex in structure, high in cost and unsatisfactory in detection precision.
Disclosure of Invention
The invention aims to provide a temperature sensor based on an optical fiber, which can detect temperature more accurately and sensitively.
In order to achieve the purpose, the invention provides the following scheme:
an optical fiber-based temperature sensor comprising a light pipe, a non-ferrous metal ion solution, and a thermocouple;
the light guide pipe is provided with a cavity, and the non-ferrous metal ion solution is arranged in the cavity;
the thermocouple comprises a part arranged in the light guide tube and a part arranged outside the light guide tube which are connected with each other; the part of the thermocouple arranged in the light guide tube passes through the cavity to be in contact with the non-ferrous metal ion solution.
Optionally, the optical fiber-based temperature sensor further comprises a thermal insulation layer disposed on the cavity outer wall.
Optionally, the optical fiber-based temperature sensor further comprises a refrigeration stick, the refrigeration stick is disposed in the cavity, and the refrigeration stick is used for reducing the temperature in the cavity.
Optionally, the thermocouple is an annular thermocouple, the annular thermocouple is sleeved on the refrigeration stick, and the annular thermocouple is not in contact with the refrigeration stick.
Optionally, the optical fiber-based temperature sensor further comprises a plurality of layers of transparent sleeves, the plurality of layers of transparent sleeves are disposed in the cavity, and the thermocouple passes through outer walls of the plurality of layers of transparent sleeves.
Optionally, the transparent sleeve is made of glass.
Optionally, the refrigeration rod is helical.
Optionally, the non-ferrous metal ion solution is a copper sulfate solution or a ferric chloride solution.
Optionally, the optical fiber-based temperature sensor further includes a light source and an optical signal detection device, and the light source and the optical signal detection device are respectively disposed on two sides of the light pipe.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses an optical fiber-based temperature sensor, which comprises a light pipe, a non-ferrous metal ion solution and a thermocouple, wherein the light pipe is arranged on the outer side of the non-ferrous metal ion solution; the light guide pipe is provided with a cavity, and the non-ferrous metal ion solution is arranged in the cavity; the thermocouple comprises a part arranged in the light guide tube and a part arranged outside the light guide tube which are connected with each other; the part of the thermocouple arranged in the light guide tube passes through the cavity to be in contact with the non-ferrous metal ion solution. The invention converts the temperature signal into thermal electromotive force, the non-ferrous metal ions can move in the solution due to the change of charge distribution caused by the thermal electromotive force, and the color distribution of the non-ferrous metal ion solution is changed, and the invention has extremely high detection sensitivity because the light is extremely sensitive to different color distributions and color changes.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a block diagram of an optical fiber-based temperature sensor provided in accordance with an embodiment of the present invention;
fig. 2 is a schematic view of a transparent sleeve according to an embodiment of the present invention.
Description of the symbols:
1-light pipe, 2-non ferrous metal ion solution, 3-thermocouple, 4-heat insulation layer, 5-refrigeration rod, 6-transparent sleeve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The terms "first," "second," "third," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the objects so described are interchangeable under appropriate circumstances. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
In the present disclosure, the drawings discussed below and the embodiments used to describe the principles of the present disclosure are for illustration purposes only and should not be construed to limit the scope of the present disclosure. Those skilled in the art will understand that the principles of the present invention may be implemented in any suitably arranged system. Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. Further, a terminal according to an exemplary embodiment will be described in detail with reference to the accompanying drawings. Like reference symbols in the various drawings indicate like elements.
The terms used in the description of the present invention are only used to describe specific embodiments, and are not intended to show the concept of the present invention. Unless the context clearly dictates otherwise, expressions used in the singular form encompass expressions in the plural form. In the present specification, it is to be understood that terms such as "comprising," "having," and "containing" are intended to specify the presence of stated features, integers, steps, acts, or combinations thereof, as taught in the present specification, and are not intended to preclude the presence or addition of one or more other features, integers, steps, acts, or combinations thereof. Like reference symbols in the various drawings indicate like elements.
The invention aims to provide a temperature detection device which can detect temperature more accurately and sensitively.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the optical fiber-based temperature sensor includes a light pipe 1, a non-ferrous metal ion solution 2, and a thermocouple 3. The light pipe 1 is provided with a cavity, and the non-ferrous metal ion solution 2 is arranged in the cavity. The thermocouple 3 includes a portion disposed inside the light guide 1 and a portion disposed outside the light guide 1, which are connected to each other. The thermocouple 3 is arranged in the light guide pipe 1, and the part of the thermocouple passes through the cavity to be in contact with the non-ferrous metal ion solution 2.
The light pipe 1 is used for transmitting optical signals, and the intensity of the optical signals output by the light pipe is weakened after the optical signals penetrate through the non-ferrous metal ion solution 2. When the temperature is detected, the temperature in the non-ferrous metal ion solution 2 is low, the temperature outside the light guide pipe 1 is high, so that the potential difference is generated between the part of the thermocouple 3 positioned in the cavity and the part of the thermocouple positioned outside the light guide pipe 1, the charge distribution on the thermocouple 3 changes, the non-ferrous metal ion solution 2 is influenced by the charge distribution on the thermocouple 3 to move, the color becomes uneven, and the output optical signal spectrum is influenced. The temperature can be detected by detecting the spectrum of the output optical signal.
In this embodiment, the optical fiber based temperature sensor further comprises a thermal insulation layer 4, the thermal insulation layer 4 being arranged on the outer wall of the cavity. The thermal insulation layer 4 is arranged, so that the influence of the external temperature on the cavity can be avoided, and the detection precision is improved.
In this embodiment, temperature sensor based on optic fibre still includes refrigeration stick 5, and refrigeration stick 5 sets up in the cavity, and refrigeration stick 5 is used for reducing the temperature in the cavity. The temperature in the cavity is reduced, so that the temperature of the cavity is always lower than the temperature outside the cavity, the detection range is increased, and the detection stability is improved.
In the present embodiment, the thermocouple 3 is a ring-shaped thermocouple which is sleeved on the refrigeration rod 5 and is not in contact with the refrigeration rod 5. Further, as shown in fig. 2, the optical fiber-based temperature sensor further includes a multi-layered transparent sleeve 6, the multi-layered transparent sleeve 6 being disposed in the cavity, and the thermocouple 3 passing through an outer wall of the multi-layered transparent sleeve 6. Wherein, the transparent sleeve 6 is made of glass. Thermocouple 3 passes transparent sleeve 6's outer wall, and non ferrous metal ion solution 2 can't see through the sleeve outer wall, and transparent sleeve 6 can separate out the space of round again, and every space all has non ferrous metal ion solution 2 of the same concentration, is favorable to receiving transparent sleeve 6 restriction when non ferrous metal ion receives the charge influence to remove, is formed with the chromatic circle, makes the spectral signal change of output more obvious, improves detectivity.
Further, the refrigeration rod 5 is spiral-shaped. Spiral refrigeration stick 5 can strengthen the refrigeration effect, makes the difference in temperature grow, and the potential difference is bigger, changes to be formed with the color ring, makes the spectral signal change of output more obvious, further improves detectivity.
Further, the non-ferrous metal ion solution 2 is a copper sulfate solution or an iron chloride solution.
Further, the optical fiber-based temperature sensor further comprises a light source and an optical signal detection device, and the light source and the optical signal detection device are respectively arranged on two sides of the light guide pipe 1.
The thermocouple converts the temperature signal into thermal electromotive force, the electromotive force changes along with the charge distribution, the non-ferrous metal ions in the non-ferrous metal ion solution move in the solution along with the charge distribution, and the color distribution in the non-ferrous metal ion solution changes.
The optical fiber can also be a waveguide structure made of transparent materials, and the technical effects of the invention can be achieved. Are within the scope of the invention.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to assist in understanding the core concepts of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. An optical fiber-based temperature sensor, comprising a light pipe, a non-ferrous metal ion solution, and a thermocouple;
the light guide pipe is provided with a cavity, and the non-ferrous metal ion solution is arranged in the cavity;
the thermocouple comprises a part arranged in the light guide tube and a part arranged outside the light guide tube which are connected with each other; the part of the thermocouple arranged in the light guide tube passes through the cavity to be in contact with the non-ferrous metal ion solution.
2. The optical fiber-based temperature sensor of claim 1, further comprising a thermal insulation layer disposed on the cavity outer wall.
3. The optical fiber-based temperature sensor of claim 1, further comprising a refrigeration wand disposed within the cavity, the refrigeration wand configured to reduce a temperature within the cavity.
4. The optical fiber-based temperature sensor of claim 3, wherein the thermocouple is an annular thermocouple that is sleeved over the refrigeration rod and that is not in contact with the refrigeration rod.
5. The optical fiber-based temperature sensor of claim 4, further comprising a plurality of layers of transparent sleeves, the plurality of layers of transparent sleeves being disposed within the cavity, and the thermocouple passing through an outer wall of the plurality of layers of transparent sleeves.
6. The optical fiber-based temperature sensor of claim 5, wherein the transparent sleeve is made of glass.
7. The optical fiber-based temperature sensor of claim 5, wherein the cooling rod is spiral-shaped.
8. The optical fiber-based temperature sensor of claim 1, wherein the non-ferrous metal ion solution is a copper sulfate solution or a ferric chloride solution.
9. The optical fiber-based temperature sensor of claim 1, further comprising a light source and a light signal detection device, the light source and the light signal detection device being disposed on either side of the light pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110758689.4A CN113280943B (en) | 2021-07-05 | 2021-07-05 | Temperature sensor based on light pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110758689.4A CN113280943B (en) | 2021-07-05 | 2021-07-05 | Temperature sensor based on light pipe |
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| CN113280943A true CN113280943A (en) | 2021-08-20 |
| CN113280943B CN113280943B (en) | 2022-07-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113917221A (en) * | 2021-10-09 | 2022-01-11 | 重庆师范大学 | Optical high-precision electroscope and system based on optical fiber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113917221A (en) * | 2021-10-09 | 2022-01-11 | 重庆师范大学 | Optical high-precision electroscope and system based on optical fiber |
| CN113917221B (en) * | 2021-10-09 | 2023-07-25 | 重庆师范大学 | Optical fiber-based optical high-precision electricity inspection device and system |
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| CN113280943B (en) | 2022-07-15 |
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