CN102620858A - Double long period fiber grating (LPFG) temperature and humidity sensor - Google Patents
Double long period fiber grating (LPFG) temperature and humidity sensor Download PDFInfo
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Abstract
Disclosed is a double LPFG temperature and humidity sensor. A temperature sensibilizing straight bar, a supporting straight bar and a metal casing are axially arranged between two sensing bodies, wherein a temperature sensitive LPFG is arranged on the temperature sensibilizing straight bar, a humidity sensitive LPFG is arranged in the metal casing, and tail fibers of the temperature sensitive LPFG and the humidity sensitive LPFG are welded together. When temperature and humidity in the external environment change, effective refractive indexes of a fundamental core mode and a cladding mode of the LPFG, grating period, resonant wavelength and refractive index change, then information of the temperature and the humidity of the environment can be obtained through detection of transmission wavelengths of the temperature sensitive LPFG and the humidity sensitive LPFG, and double parameters can be measured simultaneously. The double LPFG temperature and humidity sensor has the advantages of high measurement accuracy, simultaneous measurement of the temperature and the humidity, and the like; and can be used as the sensor which can measure the temperature and the humidity simultaneously.
Description
Technical field
The invention belongs to the fiber-optic grating sensor technical field, be specifically related to a kind of fiber grating Temperature Humidity Sensor that can measure temperature and humidity simultaneously.
Background technology
At present, the humidity sensor based on the Fibre Optical Sensor principle is F～P cavity structure, FBG formula structure and fiber end face film coated type structure mostly.But the inventor finds in the process of research and development: complex manufacturing process, the degree of being practical of F～P cavate humidity sensor and fiber end face film coated type humidity sensor are lower, though FBG formula humidity sensor stability better, its sensitivity is not high.Therefore, all be difficult to satisfy demands of applications.
For LPFG is a kind of transmission-type fiber grating; To reflection, compare without male offspring, in sensing measurement system, do not need isolator with traditional Fiber Bragg Grating FBG; The cycle of LPFG is longer relatively; Its Mode Coupling is the fibre core basic mode that transmits in the same way and the coupling of cladding mode, so the variation of environment is very responsive to external world for the resonance wavelength of LPFG and amplitude, has than the better temperature of Fiber Bragg Grating FBG, bending and refractive index sensitivity.Based on the humidity sensor of LPFG is the new direction of humidity sensor measurement Research in recent years.Document 1 " Song Yun etc. are based on the asymmetric humidity sensor of selling off the type ultra-long-period fiber grating, Chinese laser, 2009,36 (8): 2042～2045 " utilizes high frequency CO
2Laser has been made the asymmetric type ultra-long-period fiber grating of selling off on the common communications single-mode fiber, apply one deck Nanometer composite hydrogel for the grating top layer, has realized the measurement of humidity sensor.Document 2 [Xiujuan Yu; Ea al., Relative Humidity Sensor Based on Cascaded Long～Period Gratings With Hydrogel Coatings and Fourier Demodulation, IEEE Photonics Technology Letters; 2009; 21 (24): 1828～1830] utilize the LPFG of two cascades to be built into a horse-once interfered the loop, and apply hydrogel and carry out the humidity enhanced sensitivity, the relative humidity precision can reach 0.4%.This method to LPFG write the grid device and technology is all had relatively high expectations, cause cost of manufacture expensive, therefore also be difficult to popularize and use.In addition, based on the humidity sensor of the LPFG cross influence of account temperature and humidity not mostly.Because LPFG is comparatively responsive to temperature, this can reduce the measuring accuracy of humidity to a certain extent.Therefore the problem of the cross sensitivity between that the LPFG humidity sensor exists in practical application and the temperature has also limited the further practicability of LPFG humidity sensor.
Summary of the invention
Technical matters to be solved by this invention is to overcome the shortcoming of above-mentioned humidity, temperature sensor, and a kind of temperature and humidity, two LPFG Temperature Humidity Sensors that measuring accuracy is high under same temperature environment, can measured simultaneously are provided.
Solving the problems of the technologies described above the technical scheme that is adopted is: between two sensing bodies, axially be provided with temperature sensitizing straight beam, supporting straight beam, metal sleeve; The temperature sensitizing straight beam is provided with temperature sensitive type LPFG 6; Thoughts wet type LPFG is set in the metal sleeve, and the temperature sensitive type LPFG is welded together with the tail optical fiber of sense wet type LPFG.
Temperature sensitive type LPFG of the present invention is 1535～1555nm with the wavelength of sense wet type LPFG.
Temperature sensitive type LPFG of the present invention is identical with the wavelength of sense wet type LPFG.
The surface of sense wet type LPFG of the present invention is coated with humidity enhanced sensitivity film, and humidity enhanced sensitivity film is polyvinyl alcohol film and/or polyglutamic sorrel, and the thickness of humidity enhanced sensitivity film is 30～50 μ m.
Polyvinyl alcohol film of the present invention and polyglutamic sorrel are: plating 1 layer thickness is the polyglutamic sorrel of 5～10 μ m on the outside surface of at least 2 layers of polyethylene alcohol film.
Temperature sensitizing straight beam of the present invention is 0.5～1mm with the thickness of supporting straight beam.
Temperature sensitizing straight beam of the present invention is the red copper beam.
One end of temperature sensitizing straight beam of the present invention is arranged on the sensing body, the other end is cut into rectangular channel and another sensing body overlap joint.
Radially be processed with the bleeder vent that the aperture is 0.5～1mm on the metal sleeve of the present invention.
The present invention is employed in a temperature sensitive type LPFG and a sense wet type LPFG is set on the sensing body; The tail optical fiber of temperature sensitive type LPFG and sense wet type LPFG is carried out welding, and when the temperature of external environment changed, the effective refractive index of LPFG fibre core basic mode and cladding mode and grating cycle all can change; Cause the resonance wavelength of LPFG to change; When the humidity of external environment changes, the refractive index of the humidity sensing film on the LPFG is changed, and then influence the effective refractive index of fiber grating fibre core basic mode and cladding mode; Also can cause the resonance wavelength of LPFG to change; Through detecting the transmission peak wavelength of temperature sensitive type LPFG and sense wet type LPFG, can obtain the temperature and the humidity information of environment, the two parameters of realization are measured simultaneously; And measuring accuracy is high, has improved the reliability and security of sensor.The present invention has the measuring accuracy height, can measure advantages such as temperature and humidity simultaneously, can be used as the sensor of measuring temperature and humidity simultaneously.
Description of drawings
Fig. 1 is embodiments of the invention 1 structural representations.
Fig. 2 is the structural representation of sense wet type LPFG 6 among Fig. 1.
Fig. 3 is the structural representation of temperature sensitizing straight beam 5 among Fig. 1.
Embodiment
To further explain of the present invention, but the invention is not restricted to these embodiment below in conjunction with accompanying drawing and embodiment.
Embodiment 1
Can know that by Fig. 1～3 of the present invention pair of LPFG Temperature Humidity Sensor is to be connected by sensing body 1, supporting straight beam 2, metal sleeve 3, sense wet type LPFG 4, temperature sensitizing straight beam 5, temperature sensitive type LPFG 6, humidity enhanced sensitivity film 7 to constitute.
Wherein: the sensing body has two, all adopts stainless steel material to process cylindrical structure, and the radius of sensing body 1 is 1cm; Thickness is 1cm, is processed with 4 screws at the peripheral evenly cloth of sensing body 1, supports straight beams 2 be fixedly connected 1 temperature sensitizing straight beam 5 and 3 of screw threads for fastening connector between two sensing bodies 1; Also can 2 supporting straight beams 2 connect be installed, temperature sensitizing straight beam 5 is symmetrical schistose texture with supporting straight beam 2, and temperature sensitizing straight beam 5 and supporting straight beam 2 wide be 0.5cm, longly is 7cm, the thick 0.8mm of being; Wherein temperature sensitizing straight beam 5 is the red copper beam, and this beam is very sensitive to temperature; Improved the sensitivity of sensor, an end of temperature sensitizing straight beam 5 is fixedly connected on sensing body 1 with the screw threads for fastening connector, and the other end of temperature sensitizing straight beam 5 is cut into rectangular channel; With screw and sensing body 1 overlap joint; Spacing to temperature sensitizing straight beam 5, when temperature changed, temperature sensitizing straight beam 5 can deformation.On this temperature sensitizing straight beam 5, adopt 383 glue that the two ends of temperature sensitive type LPFG 6 are adhesively fixed on the center line on this straight beam surface, the wavelength of temperature sensitive type LPFG 6 is 1545nm, supporting straight beam 2 is stainless girder steel.The center of sensing body 1 is processed with center pit; In center pit, penetrate metal sleeve 3; The two ends of metal sleeve 3 with 502 gluing be connected on two sensing bodies 1 in intracardiac, also available 383 gluing connecing, the two ends of sense wet type LPFG 4 are with 383 gluing connecing on metal sleeve 3 inside surfaces; The wavelength of sense wet type LPFG 4 is 1545nm; The surface of metal sleeve 3 is uniformly distributed with and is processed with the bleeder vent that straight apertures is 0.8mm, and bleeder vent is a through hole, makes moisture to get into and also protects sense wet type LPFG 4 injury-free in the metal sleeve 3.The tail optical fiber of sense wet type LPFG 4 and the tail optical fiber welding of temperature sensitive type LPFG 6, the unnecessary tail optical fiber of weld is looped, and pastes on the sensing body 1.
For improving the humidity sensitivity of sensor; The surface of sense wet type LPFG 4 is coated with humidity enhanced sensitivity film 7 with conventional electro-plating method; The humidity enhanced sensitivity film 7 of present embodiment is polyvinyl alcohol film and polyglutamic sorrel; Outside surface at sense wet type LPFG 4 successively plates 4 layers of polyethylene alcohol film, and the thickness of ground floor to the four tunics is followed successively by 5 μ m, 10 μ m, 10 μ m, 10 μ m, plates 1 strata glutamic acid film at the outside surface of the 4th tunic; The thickness of polyglutamic sorrel is 8 μ m, and the thickness of humidity enhanced sensitivity film 7 is 43 μ m.Because the present invention has adopted the outside surface plating polyvinyl alcohol film at sense wet type LPFG 4; Have good bonding force and water wettability; The outside surface plating polyglutamic sorrel of plating polyvinyl alcohol film, the polyglutamic sorrel has highly-water-soluble, has improved humidity sensitivity of the present invention.
During use, two LPFG Temperature Humidity Sensors are placed in the measurement environment, when ambient temperature and humidity change, cause the temperature sensitive type LPFG 6 and the transmission peak wavelength of sense wet type LPFG 4 all to be moved.Owing to do not have humidity sensing film on the temperature sensitive type LPFG 6; The variation of temperature sensor, the thermal expansivity of its base material straight beam is big, has promptly done certain temperature sensitizing; Through measuring the variation of temperature sensitive type LPFG 6 transmission peak wavelengths, can detect the temperature of external environment.Be coated with humidity enhanced sensitivity film 7 on the sense wet type LPFG 4; And metal sleeve 3 has certain thermal insulation; The variation of 4 inductions of sense wet type LPFG humidity through detecting the variation of sense wet type LPFG 4 transmission peak wavelengths, can detect the humidity of external environment.
Principle of work of the present invention is following:
With being encapsulated in the sensor after temperature sensitive type LPFG 6 and 4 series connections of sense wet type LPFG, temperature sensitive type LPFG 6 is a temperature sensitizing, and sense wet type LPFG 4 is the humidity enhanced sensitivity.Can know that by coupled mode theory temperature sensitive type LPFG 6 can be expressed as with the phase-matching condition of sense wet type LPFG 4:
In the present embodiment; Between two sensing bodies 1, axially support straight beams 2 be fixedly connected 1 temperature sensitizing straight beam 5 and 3 of screw threads for fastening connector; Be evenly distributed on the axially peripheral of sensing body 1, the wide of each straight beam is 0.5cm, long for 7cm, thick in 0.5mm, is list structure.On temperature sensitizing straight beam 5, adopt the 383 gluing temperature sensitive type LPFGs 6 that are connected to, the wavelength of temperature sensitive type LPFG 6 is 1535～1555nm.The center of sensing body 1 is processed with center pit; In center pit, penetrate metal sleeve 3; The two ends of metal sleeve 3 with 502 gluing be connected on two sensing bodies 1 in intracardiac; The two ends of sense wet type LPFG 4 are with 383 gluing connecing on metal sleeve 3 inside surfaces, and the wavelength of sense wet type LPFG 4 is 1545nm, and the surface of metal sleeve 3 is uniformly distributed with and is processed with the bleeder vent that straight apertures is 0.5mm.The surface of sense wet type LPFG 4 is coated with humidity enhanced sensitivity film 7 with conventional electro-plating method; The humidity enhanced sensitivity film 7 of present embodiment is 4 layers of polyethylene alcohol film and 1 strata glutamic acid film, and the thickness of 4 layers of polyethylene alcohol film and 1 strata glutamic acid film and the method for plated film are identical with embodiment 1.The connecting relation of other parts and parts is identical with embodiment 1.
In the present embodiment; Between two sensing bodies 1, axially support straight beams 2 be fixedly connected 1 temperature sensitizing straight beam 5 and 3 of screw threads for fastening connector; Be evenly distributed on the axially peripheral of sensing body 1, the wide of each straight beam is 0.5cm, long for 7cm, thick in 1mm, is list structure.On temperature sensitizing straight beam 5, adopting the 383 gluing temperature sensitive type LPFGs 6 that are connected to, is the wavelength of temperature sensitive type LPFG 6 1555nm?The center of sensing body 1 is processed with center pit; In center pit, penetrate metal sleeve 3; The two ends of metal sleeve 3 with 502 gluing be connected on two sensing bodies 1 in intracardiac; The two ends of sense wet type LPFG 4 are with 383 gluing connecing on metal sleeve 3 inside surfaces, and the wavelength of sense wet type LPFG 4 is 1555nm, and the surface of metal sleeve 3 is uniformly distributed with and is processed with the bleeder vent that straight apertures is 1mm.The surface of sense wet type LPFG 4 is coated with humidity enhanced sensitivity film 7 with conventional electro-plating method; The humidity enhanced sensitivity film 7 of present embodiment is 4 layers of polyethylene alcohol film and 1 strata glutamic acid film, and the thickness of 4 layers of polyethylene alcohol film and 1 strata glutamic acid film and the method for plated film are identical with embodiment 1.The connecting relation of other parts and parts is identical with embodiment 1.
In above embodiment 1～3; The two ends of sense wet type LPFG 4 are with 383 gluing connecing on metal sleeve 3 inside surfaces; The wavelength of sense wet type LPFG 4 is identical with respective embodiments, and the surface of sense wet type LPFG 4 is coated with humidity enhanced sensitivity film 7 with conventional electro-plating method, and the humidity enhanced sensitivity film 7 of present embodiment is 4 layers of polyethylene alcohol film and 1 strata glutamic acid film; The thickness of ground floor to the four tunics is followed successively by 5 μ m, 5 μ m, 5 μ m, 10 μ m; Outside surface at the 4th tunic plates 1 strata glutamic acid film, and the thickness of polyglutamic sorrel is 5 μ m, and the thickness of humidity enhanced sensitivity film 7 is 30 μ m.The connecting relation of other parts and parts is identical with respective embodiments.
In above embodiment 1～3; The two ends of sense wet type LPFG 4 are with 383 gluing connecing on metal sleeve 3 inside surfaces; The wavelength of sense wet type LPFG 4 is identical with respective embodiments, and the surface of sense wet type LPFG 4 is coated with humidity enhanced sensitivity film 7 with conventional electro-plating method, and the humidity enhanced sensitivity film 7 of present embodiment is 4 layers of polyethylene alcohol film and 1 strata glutamic acid film; The thickness of ground floor to the four tunics is followed successively by 10 μ m, 10 μ m, 10 μ m, 10 μ m; Outside surface at the 4th tunic plates 1 strata glutamic acid film, and the thickness of polyglutamic sorrel is 10 μ m, and the thickness of humidity enhanced sensitivity film 7 is 50 μ m.The connecting relation of other parts and parts is identical with respective embodiments.
In above embodiment 1～5; The two ends of sense wet type LPFG 4 are with 383 gluing connecing on metal sleeve 3 inside surfaces; The wavelength of sense wet type LPFG 4 is identical with respective embodiments, and the surface of sense wet type LPFG 4 is coated with humidity enhanced sensitivity film 7 with conventional electro-plating method, and the humidity enhanced sensitivity film 7 of present embodiment is 2 layers of polyethylene alcohol film and 1 strata glutamic acid film; The thickness of ground floor, second tunic is followed successively by 10 μ m, 20 μ m; Outside surface at second tunic plates 1 strata glutamic acid film, and the thickness of polyglutamic sorrel is 8 μ m, and the thickness of humidity enhanced sensitivity film 7 is 38 μ m.The connecting relation of other parts and parts is identical with respective embodiments.
In above embodiment 1～5; The two ends of sense wet type LPFG 4 are with 383 gluing connecing on metal sleeve 3 inside surfaces; The wavelength of sense wet type LPFG 4 is identical with respective embodiments, and the surface of sense wet type LPFG 4 is coated with humidity enhanced sensitivity film 7 with conventional electro-plating method, and the humidity enhanced sensitivity film 7 of present embodiment is 2 layers of polyethylene alcohol film and 1 strata glutamic acid film; The thickness of ground floor, second tunic is followed successively by 10 μ m, 15 μ m; Outside surface at second tunic plates 1 strata glutamic acid film, and the thickness of polyglutamic sorrel is 5 μ m, and the thickness of humidity enhanced sensitivity film 7 is 30 μ m.The connecting relation of other parts and parts is identical with respective embodiments.
Embodiment 8
In above embodiment 1～5; The two ends of sense wet type LPFG 4 are with 383 gluing connecing on metal sleeve 3 inside surfaces; The wavelength of sense wet type LPFG 4 is identical with respective embodiments, and the surface of sense wet type LPFG 4 is coated with humidity enhanced sensitivity film 7 with conventional electro-plating method, and the humidity enhanced sensitivity film 7 of present embodiment is 2 layers of polyethylene alcohol film and 1 strata glutamic acid film; The thickness of ground floor, second tunic is followed successively by 20 μ m, 20 μ m; Outside surface at second tunic plates 1 strata glutamic acid film, and the thickness of polyglutamic sorrel is 10 μ m, and the thickness of humidity enhanced sensitivity film 7 is 50 μ m.The connecting relation of other parts and parts is identical with respective embodiments.
Embodiment 9
In above embodiment 1～8; The two ends of sense wet type LPFG 4 are with 383 gluing connecing on metal sleeve 3 inside surfaces; The wavelength of sense wet type LPFG 4 is identical with respective embodiments, and the surface of sense wet type LPFG 4 is coated with humidity enhanced sensitivity film 7 with conventional electro-plating method, and the humidity enhanced sensitivity film 7 of present embodiment is 4 a layers of polyethylene alcohol film; The thickness of ground floor to the four tunics is followed successively by 5 μ m, 10 μ m, 10 μ m, 10 μ m, and the thickness of humidity enhanced sensitivity film 7 is 35 μ m.The connecting relation of other parts and parts is identical with respective embodiments.
Embodiment 10
In above embodiment 1～8; The two ends of sense wet type LPFG 4 are with 383 gluing connecing on metal sleeve 3 inside surfaces; The wavelength of sense wet type LPFG 4 is identical with respective embodiments, and the surface of sense wet type LPFG 4 is coated with humidity enhanced sensitivity film 7 with conventional electro-plating method, and the humidity enhanced sensitivity film 7 of present embodiment is 4 a layers of polyethylene alcohol film; The thickness of ground floor to the four tunics is followed successively by 5 μ m, 5 μ m, 10 μ m, 10 μ m, and the thickness of humidity enhanced sensitivity film 7 is 30 μ m.The connecting relation of other parts and parts is identical with respective embodiments.
Embodiment 11
In above embodiment 1～8; The two ends of sense wet type LPFG 4 are with 383 gluing connecing on metal sleeve 3 inside surfaces; The wavelength of sense wet type LPFG 4 is identical with respective embodiments, and the surface of sense wet type LPFG 4 is coated with humidity enhanced sensitivity film 7 with conventional electro-plating method, and the humidity enhanced sensitivity film 7 of present embodiment is 4 a layers of polyethylene alcohol film; The thickness of ground floor to the four tunics is followed successively by 10 μ m, 10 μ m, 10 μ m, 20 μ m, and the thickness of humidity enhanced sensitivity film 7 is 50 μ m.The connecting relation of other parts and parts is identical with respective embodiments.
Embodiment 12
In above embodiment 1～8; The two ends of sense wet type LPFG 4 are with 383 gluing connecing on metal sleeve 3 inside surfaces; The wavelength of sense wet type LPFG 4 is identical with respective embodiments, and the surface of sense wet type LPFG 4 is coated with humidity enhanced sensitivity film 7 with conventional electro-plating method, and the humidity enhanced sensitivity film 7 of present embodiment is 4 strata glutamic acid films; The thickness of ground floor to the four tunics is followed successively by 5 μ m, 10 μ m, 10 μ m, 10 μ m, and the thickness of humidity enhanced sensitivity film 7 is 35 μ m.The connecting relation of other parts and parts is identical with respective embodiments.
Embodiment 13
In above embodiment 1～8; The two ends of sense wet type LPFG 4 are with 383 gluing connecing on metal sleeve 3 inside surfaces; The wavelength of sense wet type LPFG 4 is identical with respective embodiments, and the surface of sense wet type LPFG 4 is coated with humidity enhanced sensitivity film 7 with conventional electro-plating method, and the humidity enhanced sensitivity film 7 of present embodiment is 4 strata glutamic acid films; The thickness of ground floor to the four tunics is followed successively by 5 μ m, 5 μ m, 10 μ m, 10 μ m, and the thickness of humidity enhanced sensitivity film 7 is 30 μ m.The connecting relation of other parts and parts is identical with respective embodiments.
Embodiment 14
In above embodiment 1～8; The two ends of sense wet type LPFG 4 are with 383 gluing connecing on metal sleeve 3 inside surfaces; The wavelength of sense wet type LPFG 4 is identical with respective embodiments, and the surface of sense wet type LPFG 4 is coated with humidity enhanced sensitivity film 7 with conventional electro-plating method, and the humidity enhanced sensitivity film 7 of present embodiment is 4 strata glutamic acid films; The thickness of ground floor to the four tunics is followed successively by 10 μ m, 10 μ m, 10 μ m, 20 μ m, and the thickness of humidity enhanced sensitivity film 7 is 50 μ m.The connecting relation of other parts and parts is identical with respective embodiments.
According to above-mentioned principle, also can design two LPFG Temperature Humidity Sensors of other a kind of concrete structure, but all within protection scope of the present invention.
Claims (10)
1. two LPFG Temperature Humidity Sensor; It is characterized in that: between two sensing bodies (1), axially be provided with temperature sensitizing straight beam (5), supporting straight beam (2), metal sleeve (3); Temperature sensitizing straight beam (5) is provided with temperature sensitive type LPFG (6); Thoughts wet type LPFG (4) is set in the metal sleeve (3), and the tail optical fiber of temperature sensitive type LPFG (6) and sense wet type LPFG (4) is welded together.
2. according to claim 1 pair of LPFG Temperature Humidity Sensor is characterized in that: the wavelength of described temperature sensitive type LPFG (6) and sense wet type LPFG (4) is 1535～1555nm.
3. according to claim 1 and 2 pair of LPFG Temperature Humidity Sensor is characterized in that: described temperature sensitive type LPFG (6) is identical with the wavelength of sense wet type LPFG (4).
4. according to claim 1 or 2 or 3 described pairs of LPFG Temperature Humidity Sensors; It is characterized in that: the surface of described sense wet type LPFG (4) is coated with humidity enhanced sensitivity film (7); Humidity enhanced sensitivity film (7) is polyvinyl alcohol film and/or polyglutamic sorrel, and the thickness of humidity enhanced sensitivity film (7) is 30～50 μ m.
5. according to claim 4 pair of LPFG Temperature Humidity Sensor is characterized in that described polyvinyl alcohol film and polyglutamic sorrel are: plating 1 layer thickness is the polyglutamic sorrel of 5～10 μ m on the outside surface of at least 2 layers of polyethylene alcohol film.
6. according to claim 1 pair of LPFG Temperature Humidity Sensor is characterized in that: the thickness of described temperature sensitizing straight beam (5) and supporting straight beam (2) is 0.5～1mm.
7. according to claim 1 or 6 described pairs of LPFG Temperature Humidity Sensors, it is characterized in that: described temperature sensitizing straight beam (5) is the red copper beam.
8. according to claim 1 or 6 described pairs of LPFG Temperature Humidity Sensors, it is characterized in that: an end of described temperature sensitizing straight beam (5) is arranged on the sensing body (1), the other end is cut into rectangular channel and another sensing body (1) overlap joint.
9. according to claim 7 pair of LPFG Temperature Humidity Sensor is characterized in that: an end of described temperature sensitizing straight beam (5) is arranged on the sensing body (1), the other end is cut into rectangular channel and another sensing body (1) overlap joint.
10. according to claim 1 pair of LPFG Temperature Humidity Sensor is characterized in that: radially be processed with the bleeder vent that the aperture is 0.5～1mm on the described metal sleeve (3).
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| CN112378429A (en) * | 2020-10-13 | 2021-02-19 | 西北大学 | Fiber bragg grating temperature and pressure sensor based on capillary tube packaging |
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