CN207850399U - A kind of fiber grating humiture integrative sensor - Google Patents
A kind of fiber grating humiture integrative sensor Download PDFInfo
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- CN207850399U CN207850399U CN201820214280.XU CN201820214280U CN207850399U CN 207850399 U CN207850399 U CN 207850399U CN 201820214280 U CN201820214280 U CN 201820214280U CN 207850399 U CN207850399 U CN 207850399U
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Abstract
The utility model belongs to Fiber Grating Sensors Technology field, and in particular to a kind of fiber grating humiture integrative sensor.A kind of fiber grating humiture integrative sensor, including humidity sensor original paper area, temperature sensing original paper area and optical fiber, the humidity sensor original paper area and temperature sensing original paper area are set on same optical fiber, and optical fiber is made of fibre core, covering and coat.The utility model more accurately, effectively solves the problems, such as the humiture cross sensitivity of humiture integrative sensor.The engineering for realizing fiber grating humiture integrative sensor makes.
Description
Technical field
The utility model belongs to Fiber Grating Sensors Technology field, and in particular to a kind of fiber grating humiture one biography
Sensor.
Background technology
There is critically important status in fields such as meteorology, storage, civil engineerings to the monitoring of temperature and humidity, with science
The progress of technology and industrialization demand, to Temperature Humidity Sensor in environmental suitability, measurement accuracy, measurement range etc. carry
Increasingly higher demands are gone out.Currently, electricity formula Temperature Humidity Sensor is convenient for processing with its low cost, fast response time, signal
The advantages that, on the market still in leading position.However, there are interchangeability differences and long-time stability deficiency etc. for electricity formula sensor
Disadvantage, and be not suitable for being applied to electrician's electric power, petrochemical industry etc. that there are the fields of inflammable and explosive adverse circumstances.
Fiber Bragg grating type Temperature Humidity Sensor is a kind of novel warm humidity sensor to grow up with optical fiber communication technology
Device has many advantages, such as electromagnetism interference compared with conventional electrical formula Temperature Humidity Sensor, and electrical insulating property is good, dynamic range is big, and
And transducing part light weight, small, it is real-time, online, distributed to be easy to multiplexing networking realization for structure and geometry diversification
Sensing.
Fiber Bragg grating type humiture integrated transducer is mainly using bigrating structures at present, wherein a grid region
It coats humidity-sensitive material and carries out humidity sensor, and another exposed grid region measures and compensates into trip temperature.This mode is from certain journey
The measurement of the double parameters of humiture is realized on degree, however there is also many problems：May exist when coating humidity-sensitive material
The problem of adherency unevenness and edge warping, cause the chirp phenomenon of grating；Coated humidity-sensitive material thickness and length is not easily-controllable
System, causes the Temperature Humidity Sensor sensitivity of batch making inconsistent；Coat grating its center wavelength shift master of humidity-sensitive material
It is limited by the axial stress that temperature change and humidity-sensitive material generate grid region, and the axial deformation that humidity-sensitive material generates is by wet
Caused by the variation of degree and temperature jointly, the drift of exposed temperature compensation raster center wavelength is only limited by the variation of environment temperature,
Existing temperature compensation mode has ignored the axial strain that the humidity-sensitive material caused by temperature generates, to make measurement result generate mistake
Difference, therefore humiture cross sensitivity cannot be precisely compensated for.
Utility model content
The purpose of this utility model is that providing a kind of engineering high-precision optical fiber for problems of the prior art
Grating humiture integrative sensor efficiently solves the problems, such as the humiture cross sensitivity of sensor.Realize fiber grating temperature
The engineering of humidity integrative sensor makes.
The technical solution of the utility model is：
A kind of fiber grating humiture integrative sensor, including humidity sensor original paper area, temperature sensing original paper area and optical fiber,
The humidity sensor original paper area and temperature sensing original paper area is set on same optical fiber, and optical fiber is by fibre core, covering and coat
Composition.
It is provided with humidity sensor original paper area grating, the humidity sensor on the corresponding fibre core in humidity sensor original paper area
The humidity-sensitive material casing one made by modified humidity-sensitive material, the humidity-sensitive material casing are provided with outside covering in original paper area
One both ends are fixed on by epoxy resin structural adhesive one on covering.
It is provided with temperature sensing original paper area grating, the temperature sensing on the corresponding fibre core in temperature sensing original paper area
The humidity-sensitive material casing two made by modified humidity-sensitive material, the humidity-sensitive material casing are provided with outside covering in original paper area
Two both ends are fixed on by epoxy resin structural adhesive two on covering, metal-coated aluminium outside the humidity-sensitive material casing two
Film.
Specifically, the centre wavelength of humidity sensor original paper area's grating and temperature sensing original paper area grating differs 1nm
More than, while applying the prestressing force of identical 0.37-1.49N.
Specifically, the aluminium film thickness is 150-300nm.
Specifically, the internal diameter of the humidity-sensitive material casing one and humidity-sensitive material casing two is all 0.3mm, wall thickness is identical all
For 0.03-0.08mm.
Compared with prior art, fiber grating humiture integrative sensor provided by the utility model has following beneficial
Technique effect：1, the fiber Bragg grating type humidity sensor response time is effectively improved using the modification humidity-sensitive material containing hydrophobic group
Problem long, humidity hysteresis is serious；2, grating region is located at using humidity-sensitive material sleeve ring, epoxy resin structural adhesive is used in combination to be fixed
In grid region, there may be adherency is uneven and edge warping when efficiently solving conventional method coating humidity sensitive thin film, and cause grating
The problem of chirp phenomenon；3, by changing the length and wall thickness of humidity sensitive thin film casing, and apply certain prestressing force to grating, it can
To adjust centre wavelength and the sensitivity of humidity sensor in limited range；4, outside the covering in temperature sensing original paper area
The humidity-sensitive material casing made by modified humidity-sensitive material that is arranged as humidity sensor original paper area and in the humidity-sensitive material
Aluminium film is coated outside casing, more accurately, effectively solves the problems, such as the humiture cross sensitivity of humiture integrative sensor.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model.
1 fibre core, 2 coverings, 3 coats, 4 humidity sensor original paper areas, 41 humidity sensor original paper area gratings,
42 humidity-sensitive material casings one, 43 epoxy resin structural adhesives one, 5 temperature sensing original paper areas,
51 temperature sensing original paper area gratings, 52 humidity-sensitive material casings two, 53 epoxy resin structural adhesives two,
54 aluminium films.
Specific implementation mode
It is a kind of structural schematic diagram of fiber grating humiture integrative sensor, including humidity sensor original paper as shown in Figure 1
Area 4, temperature sensing original paper area 5 and optical fiber, the humidity sensor original paper area 4 and temperature sensing original paper area 5 are set to same light
On fibre, optical fiber is made of fibre core 1, covering 2 and coat 3.
It is provided with humidity sensor original paper area grating 41 on the 4 corresponding fibre core 1 of humidity sensor original paper area, described is wet
The optical fiber in degree sensing elements area 4 peels off coat 3, is provided with outside the covering 2 in humidity sensor original paper area 4 wet by modification
The humidity-sensitive material casing 1 that quick material makes, the both ends of the humidity-sensitive material casing 1 pass through epoxy resin structural adhesive
One 43 are fixed on covering 2.
It is provided with temperature sensing original paper area grating 51, the temperature on the 5 corresponding fibre core 1 of temperature sensing original paper area
The optical fiber in degree sensing elements area 5 peels off coat 3, is provided with outside the covering 2 in temperature sensing original paper area 5 wet by modification
The humidity-sensitive material casing 2 52 that quick material makes, the both ends of the humidity-sensitive material casing 2 52 pass through epoxy resin structural adhesive
2 53 are fixed on covering 2, metal-coated aluminium film 54 outside the humidity-sensitive material casing 2 52, and 54 thickness of aluminium film is
150-300nm。
The humidity sensor original paper area grating 41 and temperature sensing original paper area grating 51 centre wavelength difference 1nm with
On, intersect to avoid two raster center wavelength in practical measure, and the prestressing force for applying identical 0.37-1.49N makes
It is 0.5-2nm that the centre wavelength of the two, which all deviates,.The internal diameter of humidity-sensitive material casing 1 and humidity-sensitive material casing 2 52 is all
0.3mm, identical wall thickness is all 0.03-0.08mm, and to change the sensitivity of humidity sensor part, length can be set according to grid region length
It is fixed.The humidity-sensitive material casing 1 and the modification humidity-sensitive material of humidity-sensitive material casing 2 52 of making is to contain fluorine-based, phenyl etc.
The humidity-sensitive materials such as the modified polyimide or polyvinyl alcohol of hydrophobic group have better moisture absorption and dehumidification performance, can effectively improve
The response time of humidity sensor and humidity hysteresis error.
The operation principle of the utility model is as follows：In sensing process, the humidity-sensitive material casing one in humidity sensor original paper area 4
42 since the variation of humidity and temperature can deform upon, and generate axial adaptability to changes to humidity sensor original paper area grating 41, make wet
The centre wavelength for spending sensing elements area grating 41 generates offset.In addition humidity sensor original paper area grating 41 itself is also by the shadow of temperature
The drift that will produce centre wavelength is rung, i.e.,：
ΔλIt is wet=Δ λIt manages wet+ΔλTube temperature+Δλ0
In formula, Δ λIt is wetFor the offset that grating 41 centre wavelength in humidity sensor original paper area generates, Δ λIt manages wetFor humidity-sensitive material set
Pipe 1 is due to the offset that moisture sensitivity generates deformation and grating 41 centre wavelength in humidity sensor original paper area is made to generate, Δ λTube temperature
Grating 41 centre wavelength in humidity sensor original paper area is set to generate since temperature sensitivity generates deformation for humidity-sensitive material casing 1
Offset.Δλ0It is inclined since temperature sensitivity makes raster center wavelength generate for humidity sensor original paper area grating 41 itself
It moves.
Temperature sensing original paper goes the protection of 5 humidity-sensitive material casing 2 52 due to metal aluminium film 54, only by temperature
It influences.I.e.：
ΔλTemperature=Δ λTube temperature+Δλ0
Therefore, when being measured using the humiture integrative sensor of the utility model, cause since humidity changes
The true excursions amount of 41 centre wavelength of humidity sensor original paper area grating is Δ λIt is wet-ΔλTemperature, that is, carried out temperature-compensating.
Finally, according to the correspondence meter of humidity sensor original paper area grating 41 centre wavelength and humidity of responsible moisture measurement
The humidity value for calculating surveyed environment, according to pair of temperature sensing original paper area grating 51 centre wavelength and temperature that responsible temperature measures
It should be related to the temperature value for calculating surveyed environment.
Specific implementation mode 1
Optical fiber used in present embodiment is overall diameter 0.25mm, and the single mode optical fiber of cladding diameter 0.125mm, grid region is long
For 10mm.Selected humidity-sensitive material is fluorinated polyimide, and the internal diameter of made casing 42,52 is 0.3mm, wall thickness 0.05mm,
Length is 28mm.The grid region naked fibre length in humidity sensor original paper area 4 and temperature sensing original paper area 5 be 30mm, and successively use acetone,
Alcohol cleans up naked fibre.
By fluorine-containing polyvinyl alcohol humidity-sensitive material casing 1 and humidity-sensitive material when making sensor provided by the utility model
Casing 2 52 is separately fixed among naked fibre, and 1mm naked fibres are respectively stayed at the both ends of the two, convenient for using dispenser drop coating epoxy resin structural
Glue 1 and epoxy resin structural adhesive 2 53；Then it gives respectively to humidity sensing elements area grating 41 and temperature sensing original paper area light
Grid 51 apply the prestressing force of 0.75N, to adjust the centre wavelength of grating in limited range, improve transducer sensitivity.So
Be heating and curing the epoxy resin structural adhesive 1 and asphalt mixtures modified by epoxy resin at 2 52 both ends of humidity-sensitive material casing 1 and humidity-sensitive material casing afterwards
Fat structure glue 2 53, epoxy resin structural adhesive used have good mechanical strength, and high temperature resistant, corrosion-resistant, ensure that biography
The long-time stability of sensor.
Using thermal evaporation deposition metal lining aluminium film 54,54 thickness of aluminium film is 180nm in temperature sensing original paper area 5.Gold
The temperature expansion coefficient for belonging to aluminium film 54 is close with the temperature expansion coefficient of humidity-sensitive material, and thickness is sufficiently thin, does not interfere with wet
The hot expansibility of quick material bushing 2 52, and can be contacted with external environment to avoid humidity-sensitive material casing 2 52.
Finally it should be noted that:Above example is only to illustrate the technical solution of the utility model rather than limits it
System；Although the utility model is described in detail with reference to preferred embodiment, those of ordinary skill in the art should
Understand：It can still modify to specific embodiment of the present utility model or some technical characteristics are equally replaced
It changes；Without departing from the spirit of technical solutions of the utility model, should all cover in the claimed technical solution of the utility model
In range.
Claims (4)
1. a kind of fiber grating humiture integrative sensor, including humidity sensor original paper area (4), temperature sensing original paper area (5) and
Optical fiber, the humidity sensor original paper area (4) and temperature sensing original paper area (5) are set on same optical fiber, and optical fiber is by fibre core
(1), covering (2) and coat (3) composition, which is characterized in that
It is provided with humidity sensor original paper area grating (41) on the corresponding fibre core (1) in the humidity sensor original paper area (4), it is described wet
The humidity-sensitive material casing one (42) made by modified humidity-sensitive material, institute are provided with outside covering (2) in degree sensing elements area (4)
The both ends for the humidity-sensitive material casing one (42) stated are fixed on by epoxy resin structural adhesive one (43) on covering (2)；
It is provided with temperature sensing original paper area grating (51), the temperature on the corresponding fibre core (1) in the temperature sensing original paper area (5)
The humidity-sensitive material casing two (52) made by modified humidity-sensitive material, institute are provided with outside covering (2) in degree sensing elements area (5)
The both ends for the humidity-sensitive material casing two (52) stated are fixed on by epoxy resin structural adhesive two (53) on covering (2), described
Metal-coated aluminium film (54) outside humidity-sensitive material casing two (52).
2. fiber grating humiture integrative sensor according to claim 1, which is characterized in that the humidity sensor original paper
The centre wavelength of area's grating (41) and temperature sensing original paper area grating (51) differs 1nm or more, while applying identical 0.37-
1.49N prestressing force.
3. fiber grating humiture integrative sensor according to claim 1, which is characterized in that the aluminium film (54)
Thickness is 150-300nm.
4. fiber grating humiture integrative sensor according to claim 1, which is characterized in that the humidity-sensitive material casing
The internal diameter of one (42) and humidity-sensitive material casing two (52) is all 0.3mm, and wall thickness is identical, is all 0.03-0.08mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820214280.XU CN207850399U (en) | 2018-02-07 | 2018-02-07 | A kind of fiber grating humiture integrative sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820214280.XU CN207850399U (en) | 2018-02-07 | 2018-02-07 | A kind of fiber grating humiture integrative sensor |
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| CN207850399U true CN207850399U (en) | 2018-09-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108168586A (en) * | 2018-02-07 | 2018-06-15 | 濮阳光电产业技术研究院 | A kind of fiber grating humiture integrative sensor |
| CN111220208A (en) * | 2019-12-06 | 2020-06-02 | 山东省科学院激光研究所 | Novel optical fiber temperature and humidity sensor |
-
2018
- 2018-02-07 CN CN201820214280.XU patent/CN207850399U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108168586A (en) * | 2018-02-07 | 2018-06-15 | 濮阳光电产业技术研究院 | A kind of fiber grating humiture integrative sensor |
| CN111220208A (en) * | 2019-12-06 | 2020-06-02 | 山东省科学院激光研究所 | Novel optical fiber temperature and humidity sensor |
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| GR01 | Patent grant | ||
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Effective date of registration: 20210407 Address after: 457000 building 7, Baolong e-commerce Industrial Park, tieqiu Road, Puyang County, Puyang City, Henan Province Patentee after: Henan Minghai Optoelectronic Technology Co., Ltd Address before: No.50 tieqiu Road, Puyang County, Puyang City, Henan Province Patentee before: PUYANG PHOTOELECTRIC TECHNOLOGY INDUSTRY Research Institute |
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