CN220525167U - Temperature and humidity optical fiber sensor and temperature and humidity detection system - Google Patents
Temperature and humidity optical fiber sensor and temperature and humidity detection system Download PDFInfo
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- CN220525167U CN220525167U CN202322303777.2U CN202322303777U CN220525167U CN 220525167 U CN220525167 U CN 220525167U CN 202322303777 U CN202322303777 U CN 202322303777U CN 220525167 U CN220525167 U CN 220525167U
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 89
- 238000001514 detection method Methods 0.000 title claims abstract description 43
- 239000000835 fiber Substances 0.000 claims abstract description 143
- 238000001228 spectrum Methods 0.000 claims abstract description 61
- 230000002093 peripheral effect Effects 0.000 claims abstract description 10
- 238000005253 cladding Methods 0.000 claims description 35
- 239000011248 coating agent Substances 0.000 claims description 15
- 238000000576 coating method Methods 0.000 claims description 15
- 238000012545 processing Methods 0.000 claims description 14
- 238000012544 monitoring process Methods 0.000 claims description 12
- 239000012510 hollow fiber Substances 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- 238000005452 bending Methods 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 230000003595 spectral effect Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 4
- 230000004927 fusion Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000010259 detection of temperature stimulus Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 239000004038 photonic crystal Substances 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000000985 reflectance spectrum Methods 0.000 description 1
- 239000011540 sensing material Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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Abstract
The utility model discloses a temperature and humidity optical fiber sensor and a temperature and humidity detection system, wherein the temperature and humidity optical fiber sensor comprises a first long-period optical fiber grating, a second long-period optical fiber grating and a reflector; the first long-period fiber grating and the second long-period fiber grating have unequal resonance wavelengths; the first long-period fiber grating, the second long-period fiber grating and the reflector are sequentially connected; the diameters of fiber cores of the first long-period fiber bragg grating, the second long-period fiber bragg grating and the reflector are equal; a temperature sensitive layer is arranged on the outer peripheral side of the first long-period fiber bragg grating, and a humidity sensitive layer is arranged on the outer peripheral side of the second long-period fiber bragg grating; or, the outer peripheral side of the first long-period fiber bragg grating is provided with a humidity sensitive layer, and the outer peripheral side of the second long-period fiber bragg grating is provided with a temperature sensitive layer. The utility model can avoid the problem of spectrum loss caused by the transmission type structure in bending.
Description
Technical Field
The utility model relates to the technical field of optical fiber sensors, in particular to a temperature and humidity optical fiber sensor and a temperature and humidity detection system.
Background
The machine room is usually a place for storing servers such as telecom, network communication, mobile, double-line, electric power, government or enterprises, provides IT service and operation maintenance for various users and administrators, and along with the rapid development of information technology, the machine room has become a key IT service place for guaranteeing the work and life of people, and the machine room environment monitoring has become a key link for guaranteeing the stable operation of equipment and facilities of the machine room.
For the machine room, the physical environment of the machine room needs to be strictly monitored and controlled, and among various environmental factors of the machine room, the temperature and the humidity have larger influence on equipment. According to the classification of the machine room level in the data center design specification (GB 50174-2017), the temperature and humidity environment of the machine room should be strictly monitored by referring to the national standard as far as possible when the equipment is started up and operated according to the environmental requirement of the machine room. At present, most of temperature and humidity monitoring devices in a machine room are electronic sensing devices, temperature and humidity change values in a detection environment are converted into electric signals, change parameters of the detected environment are usually converted into measurable optical signals by an optical fiber sensor, and then the rear end of the optical fiber sensor is converted into digital signals through an optoelectronic device and a digital-analog device. The existing optical fiber sensor for temperature and humidity monitoring has many types and modes, including long-period fiber gratings (LPFGs), bragg fiber gratings (FBGs), D-type optical fibers, photonic Crystal Fibers (PCFs) and the like, but the optical fiber sensor in the prior art mostly adopts a transmission type structure, and is easy to cause spectral loss during bending.
In summary, how to avoid the problem of spectral loss caused by the transmissive structure during bending is one of the important problems to be solved in the art.
Disclosure of Invention
The utility model aims to provide a temperature and humidity optical fiber sensor and a temperature and humidity detection system, which are used for solving the defects in the prior art and can avoid the problem of spectrum loss caused by a transmission type structure in bending.
The utility model provides a temperature and humidity optical fiber sensor, wherein: the device comprises a first long-period fiber grating, a second long-period fiber grating and a reflector;
the first long-period fiber grating and the second long-period fiber grating have unequal resonance wavelengths;
the first long-period fiber grating, the second long-period fiber grating and the reflector are sequentially connected;
the diameters of fiber cores of the first long-period fiber bragg grating, the second long-period fiber bragg grating and the reflector are equal;
a temperature sensitive layer is arranged on the outer peripheral side of the first long-period fiber bragg grating, and a humidity sensitive layer is arranged on the outer peripheral side of the second long-period fiber bragg grating; or, the outer periphery side of the first long-period fiber bragg grating is provided with a humidity sensitive layer, and the outer periphery side of the second long-period fiber bragg grating is provided with a temperature sensitive layer.
The temperature and humidity optical fiber sensor, wherein optionally, the reflector comprises a hollow optical fiber and a reflective coating;
one end of the hollow fiber is connected with the second long-period fiber grating; the reflective coating is disposed at an end of the hollow fiber remote from the second long period fiber.
The temperature and humidity optical fiber sensor is characterized in that the reflective coating is a silver-plated film.
The temperature and humidity optical fiber sensor as described above, optionally, further includes a single mode optical fiber, where the single mode optical fiber is connected between the first long period optical fiber grating and the second long period optical fiber grating.
The temperature and humidity optical fiber sensor as described above, wherein optionally, the fiber core diameter of the single-mode fiber is equal to the fiber core diameter of the first long period optical fiber grating.
The temperature and humidity optical fiber sensor, wherein optionally, the first long-period optical fiber grating comprises a first cladding layer and a first grating body;
the first cladding layer is coated on the periphery of the first grating body, and the first cladding layer is a transparent layer.
The temperature and humidity optical fiber sensor, wherein optionally, the second long-period optical fiber grating comprises a second cladding layer and a second grating body;
the second cladding layer is coated on the periphery of the second grating body, and the second cladding layer is a transparent layer.
The utility model also provides a temperature and humidity detection system, wherein: the temperature and humidity optical fiber sensor comprises a light source, a circulator, a spectrum detection device and the temperature and humidity optical fiber sensor;
the light source, the spectrum detection device and the temperature and humidity optical fiber sensor are all connected with the circulator;
the spectrum detection device is used for acquiring a spectrum generated by the light source, transmitted to the temperature and humidity optical fiber sensor through the circulator, reflected by the temperature and humidity optical fiber sensor and transmitted through the circulator.
The temperature and humidity detection system comprises a spectrum detection device, a temperature and humidity detection unit, a data processing unit and a data processing unit, wherein the spectrum detection device is used for detecting temperature and humidity according to a detection structure of the spectrum detection device, and the data processing unit is in communication connection with the spectrum detection device.
The temperature and humidity detection system comprises the monitoring and early warning device, and the monitoring and early warning device is electrically connected with the data processing unit.
Compared with the prior art, the optical fiber sensor provided by the utility model adopts a reflective structure, so that the problem of spectrum loss caused by a transmissive structure in bending is avoided; the temperature and humidity of the machine room environment are monitored more sensitively by respectively coating the surfaces of the two long-period fiber gratings with different periods with temperature and humidity sensitive materials; the optical fiber splicing, cutting, coating and other mature technologies are adopted, so that the manufacturing process is simplified, the manufacturing cost is reduced, and the optical fiber splicing optical fiber is complete in structure and is not easy to damage.
Drawings
Fig. 1 is a schematic structural diagram of a temperature and humidity optical fiber sensor according to embodiment 1 of the present utility model;
fig. 2 is a schematic structural diagram of a temperature and humidity optical fiber sensor according to embodiment 2 of the present utility model;
fig. 3 is a schematic structural diagram of a temperature and humidity detecting system according to embodiment 3 of the present utility model.
Reference numerals illustrate:
the device comprises a 1-first long-period fiber grating, a 2-second long-period fiber grating, a 3-reflector, a 4-single mode fiber, a 5-light source, a 6-circulator, a 7-spectrum detection device, an 8-data processing unit and a 9-monitoring and early warning device;
11-a temperature sensitive layer, 12-a first cladding layer and 13-a first grating body;
21-a moisture sensitive layer, 22-a second cladding layer, 23-a second grating body;
31-hollow fiber, 32-reflective coating;
100-incidence spectrum;
200-reflectance spectrum.
Detailed Description
The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In view of the problems set forth in the background art, the present utility model proposes the following embodiments.
Example 1
Referring to fig. 1, the present embodiment provides a temperature and humidity optical fiber sensor, which includes a first long period optical fiber grating 1, a second long period optical fiber grating 2, and a reflector 3. The first long-period fiber grating 1 and the second long-period fiber grating 2 are respectively used for generating refractive index and stress changes when temperature and humidity change, so that resonance wavelength light of the first long-period fiber grating and the second long-period fiber grating is shifted, and detection of ambient temperature and humidity is realized by detecting spectral shift.
Specifically, the first long period fiber grating 1 and the second long period fiber grating 2 have unequal resonance wavelengths. That is, the first long-period fiber grating 1 has a first resonant wavelength, and the second long-period fiber grating 2 has a second resonant wavelength, and the first resonant wavelength and the second resonant wavelength are not equal. By setting the first resonant wavelength and the second resonant wavelength to two resonant wavelengths that are not equal, different light rays are respectively coupled into the corresponding cladding layers when passing through the first long-period fiber grating 1 and the second long-period fiber grating 2, so that the temperature and the humidity are respectively measured.
Specifically, the first long period fiber grating 1, the second long period fiber grating 2 and the reflector 3 are sequentially connected. In the implementation, the three may be end face fusion-spliced by an optical fiber fusion splicer, or optical fibers may be added between any two to connect them as needed.
The fiber core diameters of the first long-period fiber grating 1, the second long-period fiber grating 2 and the reflector 3 are equal. In the specific implementation, the outer circumferences of the first long period fiber grating 1, the second long period fiber grating 2, and the reflector 3 are also equal. By this arrangement, loss of light rays when propagating therein can be avoided.
A temperature sensitive layer 11 is arranged on the outer periphery side of the first long-period fiber bragg grating 1, and a humidity sensitive layer 21 is arranged on the outer periphery side of the second long-period fiber bragg grating 2; the temperature sensitive layer 11 is used for generating volume change when temperature changes, and generating stress change on the corresponding first long period fiber bragg grating 1, so that the resonance wavelength light of the first long period fiber bragg grating 1 is displaced, and further, the detection of temperature is realized by detecting spectrum displacement. The humidity sensitive layer 21 is configured to generate stress change when humidity changes, so as to shift the resonance wavelength light of the second long period fiber bragg grating 2, and further detect the humidity by detecting the spectral shift.
In a specific implementation, an incident broadband spectrum enters from a fiber core at one end of the first long-period fiber bragg grating 1 far away from the second long-period fiber bragg grating 2, the spectrum with the wavelength of λ1 is coupled into a corresponding cladding from the fiber core after passing through the first long-period fiber bragg grating 1, the spectrum with the wavelength of λ2 is coupled into the cladding from the fiber core, and the spectrum with the resonant wavelengths of λ1 and λ2 coupled into the cladding is transmitted in a cladding mode until being reflected by the reflector 3 and then coupled back into the corresponding fiber core from the first long-period fiber bragg grating 1 and the second long-period fiber bragg grating 2 along original paths respectively. In the process, a reflective structure is adopted, the problem of spectrum loss caused by a transmissive structure in bending is avoided, the temperature and humidity sensing materials are respectively coated on the surfaces of the long-period fiber gratings in two different periods to realize the simultaneous monitoring of the temperature and the humidity of the machine room environment, and when the temperature and the humidity change, the spectrum is displaced.
Further, the reflector 3 comprises a hollow core optical fiber 31 and a reflective coating 32. One end of the hollow fiber 31 is connected with the second long period fiber grating 2; the reflective coating 32 is disposed at an end of the hollow core optical fiber 31 remote from the second long period optical fiber. That is, the reflective coating 32 reflects only the spectrum in the cladding corresponding to the first long-period fiber grating 1 and the cladding of the second long-period fiber grating 2, and does not reflect light that remains in the core after passing through the first long-period fiber grating 1 and the second long-period fiber grating 2.
In practice, the reflective coating 32 is preferably silver-plated, i.e., the reflective coating 32 is silver-plated.
In a specific implementation, a single mode fiber 4 may be disposed between the first long period fiber grating 1 and the second long period fiber grating 2 as required, that is, the single mode fiber 4 is connected between the first long period fiber grating 1 and the second long period fiber grating 2. In one implementation, the type of the single-mode fiber 4 may be SMF-28, and the connection between the single-mode fiber 4 and the first long-period fiber 1 and the connection between the single-mode fiber 4 and the second long-period fiber 2 may be end face fusion by an optical fiber fusion splicer.
More specifically, the core diameter of the single-mode optical fiber 4 is equal to the core diameter of the first long period fiber grating 1. Because the fiber cores of the first long-period fiber bragg grating 1 and the fiber cores of the second long-period fiber bragg grating 2 are equal in diameter, namely, the fiber cores of the first long-period fiber bragg grating 1, the fiber cores of the second long-period fiber bragg grating 2 and the fiber cores of the single-mode fiber 4 are equal in diameter, the arrangement is beneficial to ensuring smooth transition of the joints among the fiber cores and avoiding loss of light rays during propagation in the joints.
In a specific implementation, the first long-period fiber grating 1 includes a first cladding layer 12 and a first grating body 13; the first cladding layer 12 is coated on the peripheral side of the first grating body 13, and the first cladding layer 12 is a transparent layer. In particular implementations, when the incident spectrum 100 is entered by the core of the first long period fiber grating 1, the spectrum having wavelength λ1 is coupled from the core into the cladding at the first long period fiber grating 1.
In a specific implementation, the second long period fiber grating 2 includes a second cladding layer 22 and a second grating body 23; the second cladding layer 22 is coated on the peripheral side of the second grating body 23, and the second cladding layer 22 is a transparent layer. When the incident spectrum 100 is entered by the core of the second long period fiber grating 2, the spectrum with wavelength λ2 is coupled from the core into the cladding at the second long period fiber grating. It will be appreciated by those skilled in the art that the incident spectrum 100 should include a spectrum having a wavelength of λ1 and a spectrum having a wavelength of λ2.
In the utility model, the relation between the long-period fiber grating period and the resonance wavelength should be satisfied, and λm=Λ [ neffcore (λ) -neffclad (λ) ], where λm is the long-period fiber grating resonance wavelength, Λ is the grating period, neffcore (λ) is the effective refractive index of the fiber core, and neffclad (λ) is the effective refractive index of the cladding. That is, the relationship between the grating period and the corresponding resonance wavelength of the first long period fiber grating 1 should satisfy the above equation, and the relationship between the grating period and the corresponding resonance wavelength of the second long period fiber grating 2 should also satisfy the above equation.
Example 2
This embodiment is a further modification of embodiment 1, and differs from embodiment 1 mainly in the positions of the humidity-sensitive layer 21 and the temperature-sensitive layer 11. The same points are not described in detail, and only the above differences are described further below.
In this embodiment, referring to fig. 2, a humidity sensitive layer 21 is disposed on the outer periphery of the first long period fiber grating 1, and a temperature sensitive layer 11 is disposed on the outer periphery of the second long period fiber grating 2. That is, in this embodiment, the positions of the temperature sensitive layer 11 and the humidity sensitive layer 21 are interchanged, and no other modification is made in the structure. It will be appreciated by those skilled in the art that due to the positional exchange between the temperature sensitive layer 11 and the humidity sensitive layer 21, an adaptive adjustment should also be made in analyzing the spectral shift.
Example 3
In this embodiment, reference is made to embodiment 1 or 2 for the portion of the temperature and humidity optical fiber sensor, which is a specific application of embodiment 1 and embodiment 2.
Referring to fig. 3, the present embodiment further provides a temperature and humidity detection system, which includes a light source 5, a circulator 6, a spectrum detection device 7, and a temperature and humidity optical fiber sensor as described in embodiment 1 or embodiment 2. The temperature and humidity optical fiber sensor is used for emitting a spectrum with corresponding wavelength from a fiber core of one end of the first long-period optical fiber grating 1 far away from the second long-period optical fiber grating 2 after the spectrum with corresponding wavelength is emitted into a broadband spectrum, and the spectrum with corresponding wavelength is reflected back to the reflector 3 through the first long-period optical fiber grating 1 and the second long-period optical fiber grating 2.
Specifically, the light source 5, the spectrum detection device 7 and the temperature and humidity optical fiber sensor are all connected with the circulator 6; the spectrum detection device 7 is configured to obtain a spectrum generated by the light source 5, propagated to the temperature and humidity optical fiber sensor through the circulator 6, reflected by the temperature and humidity optical fiber sensor, and propagated through the circulator 6.
In a specific implementation, the temperature and humidity optical fiber sensor may be connected to the circulator 6 through an optical fiber.
In this embodiment, the light source 5 is configured to provide a broadband spectrum for the optical fiber sensor, and is incident on the core of the end of the first long-period optical fiber grating 1 away from the second long-period optical fiber grating 2 after passing through the circulator 6. The reflection spectrum 200 of the temperature and humidity optical fiber sensor is output to the spectrum detection device 7 after passing through the circulator 6. The spectrum displacement is detected by the spectrum detection device 7, so that the aim of detecting the ambient temperature and humidity is fulfilled. For the principle of spectral shift and environmental temperature and humidity variation, reference can be made to example 1. And will not be described in detail herein. In a specific implementation, the spectrum detection device 7 is further configured to convert the detection result into a digital signal for the data processing unit 8 to perform data processing to calculate the corresponding temperature and humidity.
In a specific implementation, the data processing unit 8 is configured to calculate the temperature and the humidity according to the detection structure of the spectrum detection device 7, and the data processing unit 8 is in communication with the spectrum detection device 7.
In the implementation, when being applied to places such as computer lab, in order to monitor the humiture of environment in order to be convenient for further report to the police when humiture surpasses suitable scope. In this embodiment, the system further includes a monitoring and early warning device 9, where the monitoring and early warning device 9 is electrically connected to the data processing unit 8. Specifically, the monitoring and early warning device 9 may be an audible and visual alarm or a display. The determination of whether the suitable range is exceeded may be processed by the data processing unit 8, which can be realized by a person skilled in the art and will not be described in detail here.
The incident spectrum 100 in this embodiment adopts a broadband light source to meet the spectrum requirement for parameter measurement, and adopts a circulator 6 to connect the broadband light source 5, the incident end face of the first long-period fiber bragg grating 1 in the fiber sensor, and the spectrum detection device 7, respectively. The incident spectrum 100 enters the first long period fiber grating 1 through the circulator 6, the spectrum with the wavelength of lambda 1 is coupled into the first cladding 12 from the fiber core at the first long period fiber grating 1, the spectrum with the wavelength of lambda 2 is coupled into the second cladding 22 from the fiber core at the second long period fiber grating 2 section, the spectrum with the resonant wavelength of lambda 1 coupled into the cladding and the spectrum with the resonant wavelength of lambda 2 are transmitted in the first cladding 12 and the second cladding 22 until being respectively coupled back into the fiber core from the second long period fiber grating 2 and the first long period fiber grating 1 along the original path after being reflected by the end reflector 3, and the reflected spectrum 200 reaches the spectrum detection device 7 through the circulator 6 after being emitted from the incident port. Because the surfaces of the first long-period fiber grating 1 and the second long-period fiber grating 2 are respectively coated with the temperature-sensitive material and the humidity-sensitive material, when the temperature and/or the humidity in the environment of a machine room are changed, the temperature-sensitive material and/or the humidity-sensitive material respectively act on the surfaces of the coated gratings to generate refractive index and stress changes, so that the resonance wavelength light of the first long-period fiber grating 1 and the second long-period fiber grating 2 is displaced, and the monitoring of the environmental temperature and the humidity can be realized through the detection of the spectral displacement.
Through the embodiment, the utility model adopts the reflective structure, so that the problem of spectrum loss caused by the transmission structure in bending is avoided; meanwhile, the temperature and humidity sensitive materials are respectively coated on the surfaces of the two long-period fiber gratings with different periods, so that the temperature and humidity of the machine room environment can be monitored more sensitively. The utility model adopts mature technologies such as fusion welding, cutting, coating and the like of the optical fiber, simplifies the manufacturing process, reduces the manufacturing cost, has complete structure and is not easy to be damaged.
While the foregoing is directed to embodiments of the present utility model, other and further embodiments of the utility model may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (10)
1. A temperature and humidity optical fiber sensor is characterized in that: the optical fiber grating comprises a first long-period optical fiber grating (1), a second long-period optical fiber grating (2) and a reflector (3);
the first long-period fiber grating (1) and the second long-period fiber grating (2) have unequal resonance wavelengths;
the first long-period fiber grating (1), the second long-period fiber grating (2) and the reflector (3) are sequentially connected;
the fiber core diameters of the first long-period fiber grating (1), the second long-period fiber grating (2) and the reflector (3) are equal;
a temperature sensitive layer (11) is arranged on the outer peripheral side of the first long-period fiber bragg grating (1), and a humidity sensitive layer (21) is arranged on the outer peripheral side of the second long-period fiber bragg grating (2); or, the outer circumference side of the first long period fiber grating (1) is provided with a humidity sensitive layer (21), and the outer circumference side of the second long period fiber grating (2) is provided with a temperature sensitive layer (11).
2. The temperature and humidity optical fiber sensor according to claim 1, wherein: the reflector (3) comprises a hollow core optical fiber (31) and a reflective coating (32);
one end of the hollow fiber (31) is connected with the second long-period fiber grating (2); the reflective coating (32) is disposed at an end of the hollow core optical fiber (31) remote from the second long period optical fiber.
3. The temperature and humidity optical fiber sensor according to claim 2, wherein: the reflective coating (32) is a silver-plated film.
4. The temperature and humidity optical fiber sensor according to claim 1, wherein: the optical fiber grating also comprises a single mode optical fiber (4), wherein the single mode optical fiber (4) is connected between the first long-period optical fiber grating (1) and the second long-period optical fiber grating (2).
5. The temperature and humidity optical fiber sensor according to claim 4, wherein: the fiber core diameter of the single-mode fiber (4) is equal to the fiber core diameter of the first long-period fiber grating (1).
6. The temperature and humidity optical fiber sensor according to claim 1, wherein: the first long-period fiber grating (1) comprises a first cladding layer (12) and a first grating body (13);
the first cladding layer (12) is coated on the periphery of the first grating body (13), and the first cladding layer (12) is a transparent layer.
7. The temperature and humidity optical fiber sensor according to claim 1, wherein: the second long-period fiber grating (2) comprises a second cladding layer (22) and a second grating body (23);
the second cladding layer (22) is coated on the periphery of the second grating body (23), and the second cladding layer (22) is a transparent layer.
8. A temperature and humidity detection system, characterized in that: comprising a light source (5), a circulator (6), a spectrum detection device (7) and a temperature and humidity optical fiber sensor according to any one of claims 1-7;
the light source (5), the spectrum detection device (7) and the temperature and humidity optical fiber sensor are all connected with the circulator (6);
the spectrum detection device (7) is used for acquiring a spectrum generated by the light source (5), transmitted to the temperature and humidity optical fiber sensor through the circulator (6), reflected by the temperature and humidity optical fiber sensor and transmitted through the circulator (6).
9. The temperature and humidity detection system of claim 8 wherein: the device also comprises a data processing unit (8) for calculating the temperature and the humidity according to the detection structure of the spectrum detection device (7), wherein the data processing unit (8) is in communication connection with the spectrum detection device (7).
10. The temperature and humidity detection system of claim 9 wherein: the system also comprises a monitoring and early warning device (9), wherein the monitoring and early warning device (9) is electrically connected with the data processing unit (8).
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| CN202322303777.2U CN220525167U (en) | 2023-08-25 | 2023-08-25 | Temperature and humidity optical fiber sensor and temperature and humidity detection system |
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