CN111896140A - Optical fiber temperature sensor and system - Google Patents
Optical fiber temperature sensor and system Download PDFInfo
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- CN111896140A CN111896140A CN202010775940.3A CN202010775940A CN111896140A CN 111896140 A CN111896140 A CN 111896140A CN 202010775940 A CN202010775940 A CN 202010775940A CN 111896140 A CN111896140 A CN 111896140A
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- temperature
- optical fiber
- temperature sensor
- pulse laser
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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
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Abstract
The invention relates to an optical fiber temperature sensor and a system, and mainly relates to the field of temperature detection. When the optical fiber temperature sensor needs to detect the external temperature, the laser generated by the pulse laser irradiates on the temperature sensing part, the metal nano-particles on the temperature sensing part generate a magnetic field under the irradiation of the laser, when the external temperature changes, the temperature sensing part is heated and shrunk, the density of the metal nano-particles changes, so that the magnetic field intensity generated by the metal nano-particles changes, and the diamond part can generate fluorescence under the action of the magnetic field because the diamond part contains a plurality of nitrogen vacancy centers, when the magnetic field intensity generated by the metal nano-particles changes, the fluorescence intensity generated by the diamond part under the action of the magnetic field also changes, the fluorescence intensity change of the diamond part is detected, and the corresponding relation between the fluorescence intensity and the temperature to be detected is passed, and obtaining the temperature to be measured.
Description
Technical Field
The invention relates to the field of temperature detection, in particular to an optical fiber temperature sensor and an optical fiber temperature system.
Background
A temperature sensor is a sensor that senses temperature and converts it into a usable output signal. The measurement method can be divided into a contact type and a non-contact type, and the measurement method can be divided into a thermal resistor and a thermocouple according to the characteristics of sensor materials and electronic elements.
The detection principle of the temperature sensor of the thermal resistor is that the resistance value of metal changes along with the temperature change, the temperature is measured by measuring the resistance and the relation between the resistance and the temperature, and the thermocouple temperature sensor is composed of two metal wires made of different materials and welded together at the tail end. The temperature of the heating point can be accurately known by measuring the ambient temperature of the unheated part.
Because thermal resistance temperature sensor and thermocouple temperature sensor all need to heat through the metal with temperature sensor inside, the metal absorbs certain heat at the in-process of heating for this thermal resistance temperature sensor and thermocouple temperature sensor have great error to the measurement of temperature.
Disclosure of Invention
The invention aims to provide an optical fiber temperature sensor and an optical fiber temperature system aiming at the defects in the prior art, and aims to solve the problem that in the prior art, the metal in the temperature sensor needs to be heated, and the metal absorbs certain heat in the heating process, so that the temperature measurement of the thermal resistance temperature sensor and the thermocouple temperature sensor has large errors.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, the present application provides an optical fiber temperature sensor comprising: optical fiber, pulse laser, the temperature-sensing portion, diamond portion and detection portion all set up in the fibre core of optic fibre, pulse laser sets up the one end at the optic fibre core, the temperature-sensing portion sets up the one side at pulse laser, diamond portion sets up the one side of keeping away from pulse laser at the temperature-sensing portion, the detector sets up the other end at the fibre core of optic fibre, wherein, a plurality of nitrogen vacancy centers have in the diamond portion, the material of temperature-sensing portion is the thermal contraction material, and the inside packing of temperature-sensing portion has metal nanoparticle.
Optionally, the optical fiber temperature sensor further includes a diaphragm disposed between the temperature sensing portions, and a light path of the pulse laser passes through a hole of the diaphragm.
Optionally, the diameter of the aperture of the diaphragm is adjustable.
Optionally, the diameters of the metal nanoparticles filled in the temperature sensing part are the same.
Optionally, the temperature sensing part is uniformly filled with metal nanoparticles.
Optionally, the density of the metal nanoparticles filled in the temperature sensing part is greater at a position close to the optical path of the pulse laser than at a position far away from the optical path of the pulse laser.
Optionally, the detection means is a magnetic field detection means and/or a fluorescence detection means.
In a second aspect, the present application provides an optical fiber temperature sensing system comprising: the processor is in communication connection with the detector of the optical fiber temperature sensor, and the processor is used for analyzing and calculating the temperature to be measured.
The invention has the beneficial effects that:
the application provides an optical fiber temperature sensor includes: the optical fiber, the pulse laser, the temperature sensing part, the diamond part and the detection part are all arranged in the fiber core of the optical fiber, the pulse laser is arranged at one end of the fiber core of the optical fiber, the temperature sensing part is arranged at one side of the pulse laser, the diamond part is arranged at one side of the temperature sensing part far away from the pulse laser, and the detector is arranged at the other end of the fiber core of the optical fiber, wherein the diamond part is internally provided with a plurality of nitrogen vacancy centers, the temperature sensing part is made of a thermal contraction material and is internally filled with metal nano particles, when the external temperature needs to be detected, the laser generated by the pulse laser irradiates on the temperature sensing part, the metal nano particles on the temperature sensing part generate a magnetic field under the irradiation of the laser, and when the external temperature changes, the temperature sensing part is heated to contract, the density of the metal nano particles is changed, so that the magnetic field intensity generated by the metal nano particles is changed, the diamond part can generate fluorescence under the action of a magnetic field because the diamond part contains a plurality of nitrogen vacancy centers, when the magnetic field intensity generated by the metal nano particles is changed, the fluorescence intensity generated by the diamond part under the action of the magnetic field is also changed, the fluorescence intensity change of the diamond part is detected, and the temperature to be detected is obtained through the corresponding relation between the fluorescence intensity and the temperature to be detected.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of an optical fiber temperature sensor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another optical fiber temperature sensor according to an embodiment of the present invention.
Icon: 10-an optical fiber; 20-a pulsed laser; 30-a temperature sensing part; 40-a diamond portion; 50-a detection section; 60-diaphragm; 61-hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of 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 embodiment is a metal plate embodiment of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. 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, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In order to make the implementation of the present invention clearer, the following detailed description is made with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an optical fiber temperature sensor according to an embodiment of the present invention; as shown in fig. 1, the present application provides an optical fiber temperature sensor, including: the optical fiber 10, the pulse laser 20, the temperature sensing portion 30, the diamond portion 40 and the detection portion 50 are all arranged in the fiber core of the optical fiber 10, the pulse laser 20 is arranged at one end of the fiber core of the optical fiber 10, the temperature sensing portion 30 is arranged on one side of the pulse laser 20, the diamond portion 40 is arranged on one side, away from the pulse laser 20, of the temperature sensing portion 30, the detector is arranged at the other end of the fiber core of the optical fiber 10, wherein the diamond portion 40 is provided with a plurality of nitrogen vacancy centers, the temperature sensing portion 30 is made of a heat shrinkage material, and the temperature sensing portion 30 is filled with metal nano particles.
The pulse laser 20, the temperature sensing part 30, the diamond part 40 and the detection part 50 are sequentially arranged in the fiber core of the optical fiber 10 from left to right, wherein the pulse laser 20 and the detection part 50 are arranged at two ends of the fiber core of the optical fiber 10, a certain distance can exist between the pulse laser 20, the temperature sensing part 30, the diamond part 40 and the detection part 50, and the pulse laser 20, the temperature sensing part 30, the diamond part 40 and the detection part 50 can also be arranged in a close fit manner, because the fiber core of the optical fiber 10 is of a circular tube-shaped structure, the pulse laser 20, the temperature sensing part 30, the diamond part 40 and the detection part 50 are all of a cylindrical structure, the diameter of the cylinder is equal to the diameter of the inner wall of the fiber core of the optical fiber 10, the heights of the pulse laser 20, the temperature sensing part 30, the diamond part 40 and the detection part 50 of the cylindrical structure are selected according to actual needs, and are not specifically limited herein, and, the thermal contraction coefficient of the thermal contraction material is determined according to actual needs, and is not specifically limited herein, it should be noted that the larger the thermal contraction coefficient is, the more obvious the volume change of the temperature sensing part 30 along with the temperature is, the higher the accuracy of the temperature to be measured is, the metal nanoparticles are filled in the temperature sensing part 30, the material of the metal nanoparticles is generally noble metal, which can be one of noble metals, or mixed noble metal formed by multiple combinations of noble metals, and is not specifically limited herein, if the material of the metal nanoparticles is mixed noble metal formed by multiple combinations, the mixing ratio and mixing type of the multiple noble metals are defined according to actual needs, and is not specifically limited herein, and because the diamond part 40 has multiple nitrogen vacancy centers, fluorescence can be generated under the stimulation of a magnetic field, which is specifically far away from that the NV center in the diamond is a carbon atom in the diamond replaced by one nitrogen atom, then a hole formed by capturing the surrounding is a unique fluorescent light scattering absorption spectrum lattice defect which can generate fluorescence; when the external temperature needs to be detected, the laser generated by the pulse laser 20 is irradiated on the temperature sensing part 30, the metal nanoparticles on the temperature sensing part 30 generate a magnetic field under the irradiation of the laser, when the external temperature changes, the temperature sensing part 30 is heated and contracted, the density of the metal nanoparticles changes, so that the magnetic field intensity generated by the metal nanoparticles changes, and because the diamond part 40 contains a plurality of nitrogen vacancy centers, the diamond part 40 can generate fluorescence under the action of the magnetic field, when the magnetic field intensity generated by the metal nanoparticles changes, the fluorescence intensity generated by the diamond part 40 under the action of the magnetic field also changes, the temperature to be detected is obtained by detecting the fluorescence intensity change of the diamond part 40 and by the corresponding relationship between the fluorescence intensity and the temperature to be detected, it should be noted that the corresponding relationship between the fluorescence intensity and the temperature to be measured is obtained according to experimental measurement, and is not specifically limited herein, and because the temperature change condition is converted into the magnetic field change condition in the present application, the temperature measurement errors of the thermistor temperature sensor and the thermocouple temperature sensor in the prior art are reduced, so that the detection precision of the temperature to be measured is higher, and the sensitivity of the nitrogen vacancy center of the diamond to the magnetic field change detection is higher, thereby improving the sensitivity of the temperature to be measured.
Fig. 2 is a schematic structural diagram of another optical fiber temperature sensor according to an embodiment of the present invention, as shown in fig. 2, optionally, the optical fiber temperature sensor further includes an aperture 60, the aperture 60 is disposed between the temperature sensing portions 30, and an optical path of the pulse laser 20 passes through a hole 61 of the aperture 60.
The diaphragm 60 is used for limiting the light of the laser, so that the laser emitted by the laser can be continuously transmitted only through the laser of the hole 61, the laser which does not pass through the hole 61 is absorbed by the diaphragm 60, and the influence of impurity light on the detection of the temperature to be detected is reduced.
Optionally, the diameter of the aperture 61 of the diaphragm 60 is adjustable.
The diaphragm 60 can be made of a heat shrinkable material, and when the temperature sensitive portion 30 shrinks, the diaphragm 60 also shrinks, so that the diameter of the hole 61 of the diaphragm 60 can be adjusted, and the adjusted hole 61 of the diaphragm 60 causes different limitations on the laser light, generally, the diaphragm 60 is made of a light-tight material, and the temperature sensitive portion 30 is made of a transparent heat shrinkable material.
Alternatively, the diameters of the metal nanoparticles filled in the temperature sensing part 30 are the same.
The diameters of the metal nanoparticles filled in the temperature sensing part 30 are basically the same, the metal nanoparticles with the same diameters are distributed in the temperature sensing part 30, the factors influencing the magnetic field generated by the metal nanoparticles are only the volume of the temperature sensing part 30, the influence of other factors on temperature measurement is reduced, and the measurement result of the temperature is more accurate.
Optionally, the temperature sensing part 30 is uniformly filled with metal nanoparticles.
The metal nanoparticles with the same diameter are uniformly filled in the temperature sensing part 30, so that the influence factors of the magnetic field generated by the metal nanoparticles are further reduced, and the temperature measurement result is more accurate.
Optionally, the density of the metal nanoparticles filled in the temperature sensing part 30 is larger at a position close to the optical path of the pulse laser 20 than at a position far from the optical path of the pulse laser 20.
The density of the metal nanoparticles close to the optical path position of the pulse laser 20 is set to be greater than the density of the metal nanoparticles away from the optical path position of the pulse laser 20, so that the sensitivity of the metal nanoparticles to the detection of the temperature is higher, when the temperature has a slight change, and the distance between the metal nanoparticles has a slight change, the generated magnetic field is changed, so that the detection sensitivity of the temperature is higher.
Optionally, the detection part 50 is a magnetic field detection device and/or a fluorescence detection device.
The magnetic field detection device is used for detecting the magnetic field change condition generated by the metal nano-particles, the fluorescence detection device is used for detecting the light intensity condition of fluorescence generated by the diamond part 40 under the action of a magnetic field, the detection part 50 can be a magnetic field detection device alone or a fluorescence detection device alone, and can also be provided with a magnetic field detection device and a fluorescence detection device simultaneously, and the magnetic field detection device and the fluorescence detection device are used for detecting the magnetic field change condition generated by the metal nano-particles and the light intensity condition of fluorescence generated by the diamond part 40 under the action of the magnetic field simultaneously.
The application provides an optical fiber temperature sensor includes: the optical fiber 10, the pulse laser 20, the temperature sensing part 30, the diamond part 40 and the detection part are all arranged in the fiber core of the optical fiber 10, the pulse laser 20 is arranged at one end of the fiber core of the optical fiber 10, the temperature sensing part 30 is arranged at one side of the pulse laser 20, the diamond part 40 is arranged at one side of the temperature sensing part 30 far away from the pulse laser 20, and the detector is arranged at the other end of the fiber core of the optical fiber 10, wherein the diamond part 40 is provided with a plurality of nitrogen vacancy centers, the temperature sensing part 30 is made of a heat shrinkage material, metal nano particles are filled in the temperature sensing part 30, when the external temperature needs to be detected, laser generated by the pulse laser 20 irradiates on the temperature sensing part 30, the metal nano particles on the temperature sensing part 30 generate a magnetic field under the irradiation of the laser, when the external temperature changes, the temperature sensing portion 30 is heated and contracted, the density of the metal nanoparticles changes, so that the magnetic field intensity generated by the metal nanoparticles changes, and the diamond portion 40 contains a plurality of nitrogen vacancy centers, so that the diamond portion 40 can generate fluorescence under the action of the magnetic field, when the magnetic field intensity generated by the metal nanoparticles changes, the fluorescence intensity generated by the diamond portion 40 under the action of the magnetic field also changes, the fluorescence intensity change of the diamond portion 40 is detected, and the temperature to be detected is obtained through the corresponding relation between the fluorescence intensity and the temperature to be detected.
The present application provides an optical fiber 10 temperature sensing system, the optical fiber 10 temperature sensing system includes: the processor is in communication connection with the detector of the optical fiber temperature sensor, and the processor is used for analyzing and calculating the temperature to be measured.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A fiber optic temperature sensor, comprising: optic fibre, pulse laser ware, temperature-sensing portion, diamond portion and detection portion, pulse laser ware the temperature-sensing portion diamond portion with detection portion all sets up in the fibre core of optic fibre, pulse laser ware sets up the one end of optic fibre core, the temperature-sensing portion sets up one side of pulse laser ware, diamond portion sets up temperature-sensing portion is kept away from one side of pulse laser ware, the detector sets up the other end of the fibre core of optic fibre, wherein, have a plurality of nitrogen vacancy centers in the diamond portion, the material of temperature-sensing portion is the heat shrink material, just the inside packing of temperature-sensing portion has metal nanoparticle.
2. The optical fiber temperature sensor according to claim 1, further comprising a diaphragm disposed between the temperature sensing portions, and an optical path of the pulse laser passes through a hole of the diaphragm.
3. The fiber optic temperature sensor of claim 2, wherein the aperture of the diaphragm has an adjustable diameter.
4. The optical fiber temperature sensor according to claim 3, wherein the diameters of the metal nanoparticles filled in the temperature sensing part are the same.
5. The optical fiber temperature sensor according to claim 4, wherein the temperature sensing part is uniformly filled with metal nanoparticles.
6. The optical fiber temperature sensor according to claim 4, wherein the metal nanoparticles filled in the temperature sensing portion have a density that is greater at a position close to the pulse laser optical path than at a position remote from the pulse laser optical path.
7. The optical fiber temperature sensor according to claim 1, wherein the detecting portion is a magnetic field detecting device and/or a fluorescence detecting device.
8. An optical fiber temperature sensing system, comprising: the optical fiber temperature sensor of any one of claims 1-7, and a processor, wherein the processor is in communication with the detector of the optical fiber temperature sensor, and is used for analyzing and calculating the temperature to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010775940.3A CN111896140A (en) | 2020-08-05 | 2020-08-05 | Optical fiber temperature sensor and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010775940.3A CN111896140A (en) | 2020-08-05 | 2020-08-05 | Optical fiber temperature sensor and system |
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| Publication Number | Publication Date |
|---|---|
| CN111896140A true CN111896140A (en) | 2020-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010775940.3A Withdrawn CN111896140A (en) | 2020-08-05 | 2020-08-05 | Optical fiber temperature sensor and system |
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| CN (1) | CN111896140A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112524749A (en) * | 2020-12-04 | 2021-03-19 | 武汉舒适易佰科技有限公司 | Energy consumption controller |
| CN113280943A (en) * | 2021-07-05 | 2021-08-20 | 西南大学 | Temperature sensor based on optical fiber |
| CN113358234A (en) * | 2021-06-10 | 2021-09-07 | 山东第一医科大学(山东省医学科学院) | Temperature sensor |
-
2020
- 2020-08-05 CN CN202010775940.3A patent/CN111896140A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112524749A (en) * | 2020-12-04 | 2021-03-19 | 武汉舒适易佰科技有限公司 | Energy consumption controller |
| CN113358234A (en) * | 2021-06-10 | 2021-09-07 | 山东第一医科大学(山东省医学科学院) | Temperature sensor |
| CN113358234B (en) * | 2021-06-10 | 2022-03-25 | 山东第一医科大学(山东省医学科学院) | Temperature sensor |
| CN113280943A (en) * | 2021-07-05 | 2021-08-20 | 西南大学 | Temperature sensor based on optical fiber |
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Application publication date: 20201106 |