CN108982415A - A kind of FPI cascade type optical fiber humidity sensor and preparation method based on GQDs-PVA filling - Google Patents
A kind of FPI cascade type optical fiber humidity sensor and preparation method based on GQDs-PVA filling Download PDFInfo
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Abstract
The invention proposes a kind of FPI cascade type optical fiber humidity sensors and preparation method based on GQDs-PVA filling.The FPI cascade connection type humidity sensor is made of single mode optical fiber, photonic crystal fiber, hollow-core fiber and GQDs-PVA mixture, wherein, GQDs-PVA mixture is filled in inside hollow-core fiber, the length of photonic crystal fiber is aum, the length that hollow-core fiber is not filled by GQDs-PVA mixture is bum, and 0.5 a:b≤1 <, to form the sensing arrangement of FPI cascade connection type.The other end of single mode optical fiber is connected with optical fiber circulator, and the other both ends of circulator are connected with wide spectrum light source and spectrometer respectively.FPI cascade type optical fiber humidity sensor proposed by the present invention based on GQDs-PVA filling is reflective structure, has many advantages, such as that structure is simple, sensor is at low cost, sensitive material is not easily to fall off, high sensitivity, measurement range are wide.
Description
Technical field
The invention belongs to light fibre humidity field of sensing technologies, and in particular to a kind of FPI cascade based on GQDs-PVA filling
Type light fibre humidity transducer and preparation method.
Background technique
In the fields such as agricultural, pharmacy and medicine, agricultural output, pharmaceutical products are seriously affected to the detection of humidity value
Drug effect.Therefore, realize that humidity precise measurement is a problem to be solved.Compared with traditional electrochemistry humidity sensor, light
Fine humidity sensor avoids complicated mechanical mechanism, does not depend on and semiconductor material, thus has small in size, anti-electromagnetism dry
Disturb, long service life the advantages that.Wherein, humidity sensitive material is mainly coated in optical fiber side by current light fibre humidity transducer
Or end face, when humidity value changes, the volume or refractive index of humidity sensitive material will change, to influence light
The variation of spectrum realizes moisture measurement by the variation of detection spectrum.In the long-term use, it is this in fiber end face or
The method of person side coating sensitive material easily makes sensitive material fall off, to influence the sensing capabilities of sensor, reduces and passes
The service life of sensor.Therefore, develop a kind of high sensitivity, measurement range is wide and humidity sensitive material is not easily to fall off optical fiber it is wet
Degree sensor becomes the technical issues of this field urgently solves.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention proposes a kind of FPI cascade type optical fiber based on GQDs-PVA filling
Humidity sensor has obtained a kind of preparing simple, compact-sized, highly sensitive, Wide measuring range light fibre humidity sensor.
The technical solution of type of the present invention are as follows:
A kind of FPI cascade type optical fiber humidity sensor based on GQDs-PVA filling, photonic crystal fiber both ends are melted respectively
Order mode fiber and hollow-core fiber fill GQDs-PVA mixture from the free end of hollow-core fiber to welding end；Photonic crystal light
Fine length is a μm, and the length that hollow-core fiber is not filled by GQDs-PVA is b μm, and 0.5 a:b≤1 <.
Further, above-mentioned hollow-core fiber internal diameter is 10~51 μm.
Further, in GQDs-PVA mixture, the mass ratio of PVA and GQDs are 0.5.
The preparation method of the above-mentioned FPI cascade type optical fiber humidity sensor based on GQDs-PVA filling, includes the following steps:
Step 1: the preparation of GQDs-PVA mixture: the mass ratio of PVA and GQDs is 0.5, wherein GQDs is with solution shape
Formula is added, PVA and GQDs solution is mixed later and be placed under magnetic stirrer and stirred by concentration 1mg/mL, mixing speed
For 2000-3000rad/min, whipping temp is 30-40 DEG C；
Step 2: one section of photonic crystal light the preparation of FPI cascade type optical fiber humidity sensor structure: is cut using optical fiber cutter
Fine, a single-mode fiber and hollow-core fiber；A single-mode fiber and photonic crystal fiber one end are individually positioned in fused fiber splice
In machine, the strength of discharge for adjusting optical fiber splicer is 60~80, and advance distance is not more than 3 μm, to single mode optical fiber and photonic crystal
Optical fiber carries out manual weld；The other end of photonic crystal fiber and hollow-core fiber are put into respectively inside optical fiber splicer later,
The strength of discharge for adjusting optical fiber splicer is 50~80, and advance distance is not more than 3 μm, to hollow-core fiber and photonic crystal fiber into
Row manual weld completes the preparation of photonic crystal fiber convex cone type sensing arrangement；
Step 3: GQDs-PVA mixture prepared by step 1 is filled from the free end of hollow-core fiber to welding end, is made
A μm of length of photonic crystal fiber b μm of relationship of length for being not filled by GQDs-PVA with hollow-core fiber are as follows: 0.5 a:b≤1 <.
GQDs-PVA mixture is filled into inside hollow-core fiber fibre core in the present invention, and GQDs-PVA filler can be with humidity
Increase refractive index reduce, volume expansion；When humidity gradually increases, the corresponding refractive index of difference filling length and volume expansion
It is of different sizes.
The beneficial effects of the present invention are:
1. reflex sensing device structure proposed by the present invention preparation is simple, in wide measurement humidity range, have compared with
High sensitivity, and reflex sensing structure has advantage small in size, meets the requirement of micromation, can be narrow, severe
It is used under environmental condition.
2. the FPI cascade type optical fiber humidity sensor proposed by the present invention based on GQDs-PVA filling, GQDs-PVA filling
Type method overcomes humidity sensing film and is attached to optical fiber surface or end face problem easy to fall off.
3. the pass between GQDs-PVA filling length proposed by the present invention and FPI cascade type optical fiber humidity sensor sensitivity
System: when GQDs-PVA mixture fills length less than 67.14 μm, with the increase of filling length, sensitivity is gradually increased.When
When the filling length of GQDs-PVA mixture is 67.14 μm, the sensitivity highest of sensor.This sensor has at low cost, body
The advantages that product is small, preparation is simple, high sensitivity and measurement range are wide.
Detailed description of the invention
Fig. 1 is the front view of the FPI cascade type optical fiber humidity sensor based on GQDs-PVA filling of type of the present invention.Figure
In: 1 single mode optical fiber；2 photonic crystal fibers；3 hollow-core fibers；4GQDs-PVA mixture.
Fig. 2 is the front view of the test macro of the humidity sensor.In figure: 5. wideband light sources, 6. circulators, 7. spectrum
Analyzer, 8. sensing probes.
Fig. 3 is interference light spectrogram of the sensing probe under different humidity environment filled when length is 19.87 μm.(a) wet
Angle value corresponding interference light spectrogram when being 15.07%RH, dotted line are the lower envelope line of interference spectrum；(b) when humidity value is
The corresponding interference light spectrogram of 34.48%RH, dotted line are the lower envelope line of interference spectrum；(c) it is corresponding when humidity value is 58.48%RH
Interference light spectrogram, dotted line be interference spectrum lower envelope line；(d) corresponding interference spectrum when humidity value is 78.48%RH
Figure, dotted line are the lower envelope line of interference spectrum；(e) corresponding interference light spectrogram when humidity value is 93.37%RH, dotted line is dry
Relate to the lower envelope line of spectrum；
Fig. 4 is interference light spectrogram of the sensing probe under different humidity environment filled when length is 58.56 μm.(a) wet
Angle value corresponding interference light spectrogram when being 25.33%RH, dotted line are the lower envelope line of interference spectrum；(b) humidity value is 38.38%
Corresponding interference light spectrogram when RH, dotted line are the lower envelope line of interference spectrum；(c) it is corresponding dry when humidity value is 58.59%RH
Relate to spectrogram；(d) corresponding interference light spectrogram when humidity value is 63.71%RH, dotted line are the lower envelope line of interference spectrum；(e)
Humidity value corresponding interference light spectrogram when being 83.54%RH, dotted line are the lower envelope line of interference spectrum；
Fig. 5 is interference light spectrogram of the sensing probe under different humidity environment filled when length is 67.14 μm.(a) wet
Angle value corresponding interference light spectrogram when being 19.63%RH, dotted line are the lower envelope line of interference spectrum；(b) humidity value is 39.08%
Corresponding interference light spectrogram when RH, dotted line are the lower envelope line of interference spectrum；(c) it is corresponding dry when humidity value is 59.33%RH
Spectrogram is related to, dotted line is the lower envelope line of interference spectrum；(d) corresponding interference light spectrogram when humidity value is 69.59%RH, it is empty
Line is the lower envelope line of interference spectrum；(e) corresponding interference light spectrogram when humidity value is 78.86%RH, dotted line is interference spectrum
Lower envelope line；
Fig. 6 is the relationship between the envelope and humidity value of the interference spectrum under different filling length.(a) length is filled
Relationship at 19.87 μm between the envelope and humidity value of corresponding interference spectrum；(b) it is corresponding when filling length is 58.56 μm
Relationship between the envelope and humidity value of interference spectrum；(c) when filling length is 67.14 μm the envelope of corresponding interference spectrum with
Relationship between humidity value.
Specific embodiment
By specific embodiment, technical solution of the present invention will be further described with reference to the accompanying drawing.
Step 1: the preparation of GQDs-PVA mixture, detailed process is as follows: weighing 1.45mL concentration is 1mg/mL's
The PVA of GQDs and 2.9mg, the two are respectively placed in the same beaker；Small beaker is placed on magnetic stirrer later, is adjusted
Mixing speed is 3000rad/min, is sufficiently stirred under conditions of temperature is 30 DEG C, is placed spare.
Step 2: the preparation of FPI cascade type optical fiber humidity sensor structure, the length of photonic crystal fiber is in this example
281.43 μm, the length of hollow-core fiber is 490.83 μm, and specific manufacturing process is as follows: by a single-mode fiber and photonic crystal light
Fine one end is individually positioned in optical fiber splicer, and the strength of discharge for adjusting optical fiber splicer is 60~80, and advance distance is 0 μm -3
μm, manual weld is carried out to single mode optical fiber and photonic crystal fiber；Later by the other end of photonic crystal fiber and hollow-core fiber
It is put into inside optical fiber splicer respectively, the strength of discharge for adjusting optical fiber splicer is 50~80, and advance distance is 0 μm -3 μm, right
Hollow-core fiber and photonic crystal fiber carry out manual weld, and such FPI cascade type optical fiber humidity sensor structure preparation is completed.
Step 3: GQDs-PVA mixture prepared by step 1 is filled into hollow-core fiber, is controlled by the filling time
The filling length of GQDs-PVA mixture, filling length is 19.87 μm in this example, and 58.56 μm, length is 67.14 μm.
Step 4: moisture measurement.The basic principle of present invention detection humidity are as follows: GQDs is the honeycomb structure of single layer, tool
There is biggish specific surface area, and the oxygen-containing functional groups such as a large amount of hydroxyl, carboxyl, carbonyl are contained on surface, these characteristics can
Adsorbed water molecule, and PVA is as a kind of humidity-sensitive material, also can adsorbed water molecule, and there is viscosity well；GQDs with
Both PVA can be reduced with the refractive index variable of humidity, and volume can all expand, this will affect the interference light of optical fiber structure
Spectrum, can be consequently used for moisture measurement.The working principle of FPI cascade type optical fiber humidity sensor structure are as follows: when single mode is passed through in input
When the face of weld of optical fiber arrival single mode optical fiber and photonic crystal fiber, due between the fibre core and photonic crystal fiber of single mode optical fiber
Refringence, part light can reflect, and remaining part light continues onwards transmission；When this part light of onwards transmission reaches
When the face of weld of photonic crystal fiber and hollow-core fiber, due to the refringence at photonic crystal fiber and hollow-core fiber fibre core,
It is reflected at this point, also having small part light, rest part light continues onwards transmission；When this part, light encounters GQDs-PVA filling
It when object, also has light and reflects, finally can all be transmitted to single mode optical fiber between this three parts reflected light, and in single mode optical fiber
It interferes, three reflectings surface mutually form three Fabry-Perot interference cavities, when the filling length of GQDs-PVA filler is small
When 67.14 μm, three reflected lights can be superimposed, and form cursor effect.The present invention will be filled with the FPI grade of GQDs-PVA mixture
Connection type light fibre humidity transducer is placed under different humidity environments, observes the envelope for the interference spectrum that it is generated by cursor effect
The variation of line is to realize the research to sensor senses performance.
The comparison discovery of last Fig. 6, when filling length is 67.14 μm, the present invention has highest sensitivity.Table 1
Comparison shows that humidity sensor of the invention when filling length is 67.14 μm, meets wide measurement range and with higher
Sensitivity.
The comparison of 1 different humidity transducer sensitivity of table
Bibliography:
[1]Dan Su,XueguangQiao et al.A fiber Fabry–Perot interferometer based
on a PVA coating for humidity measurement,Optics Communications,2013,311:107-
110.
[2]L.-P.Sun,J.Li,L.Jin,Y.Ran,B.-O.Guan,High-birefringence microfiber
Sagnac interferometer based humidity sensor,Sens.Actuators B:Chem,2016,231:
696–700.
[3]Massaroni C,Caponero M A,D'Amato R,et al.Fiber Bragg Grating
Measuring System for Simultaneous Monitoring of Temperature and Humidity in
Mechanical Ventilation:[J].Sensors,2017,17(4):749.
[4]Yaoming Huang,Wenguo Zhu,High-performance fibre-optic humidity
sensor based on a side-polished fibre wavelength selectively coupled with
graphene oxide film.Sensors and Actuators B,2018,255:57-69.
[5]Liang L,Sun H,Liu N,et al.High-sensitivity optical fiber relative
humidity probe with temperature calibration ability[J].Applied Optics,2018,57
(4):872-876。
Claims (4)
1. a kind of FPI cascade type optical fiber humidity sensor based on GQDs-PVA filling, which is characterized in that photonic crystal fiber two
End difference welding single mode optical fiber and hollow-core fiber, GQDs-PVA mixture is filled from the free end of hollow-core fiber to welding end；Light
The length of photonic crystal fiber is a μm, and the length that hollow-core fiber is not filled by GQDs-PVA is b μm, and 0.5 a:b≤1 <.
2. the FPI cascade type optical fiber humidity sensor according to claim 1 based on GQDs-PVA filling, feature exist
In hollow-core fiber internal diameter is 10~51 μm.
3. the FPI cascade type optical fiber humidity sensor according to claim 1 or 2 based on GQDs-PVA filling, feature
It is, in GQDs-PVA mixture, the mass ratio of PVA and GQDs are 0.5.
4. any FPI cascade type optical fiber humidity sensor preparation side based on GQDs-PVA filling in claims 1 to 3
Method, which comprises the steps of:
Step 1: the preparation of GQDs-PVA mixture: the mass ratio of PVA and GQDs is 0.5, wherein GQDs adds in the form of a solution
Enter, concentration 1mg/mL, PVA and GQDs solution is mixed later and is placed under magnetic stirrer and is stirred, mixing speed is
2000-3000rad/min, whipping temp are 30-40 DEG C；
Step 2: the preparation of FPI cascade type optical fiber humidity sensor structure: using optical fiber cutter cut one section of photonic crystal fiber,
A single-mode fiber and hollow-core fiber；A single-mode fiber and photonic crystal fiber one end are individually positioned in optical fiber splicer
In, the strength of discharge for adjusting optical fiber splicer is 60~80, and advance distance is not more than 3 μm, to single mode optical fiber and photonic crystal light
Fibre carries out manual weld；The other end of photonic crystal fiber and hollow-core fiber are put into respectively inside optical fiber splicer later, adjusted
The strength of discharge for saving optical fiber splicer is 50~80, and advance distance is not more than 3 μm, carries out to hollow-core fiber and photonic crystal fiber
Manual weld completes the preparation of photonic crystal fiber convex cone type sensing arrangement；
Step 3: GQDs-PVA mixture prepared by step 1 is filled from the free end of hollow-core fiber to welding end, by filling out
The filling length for filling time control GQDs-PVA mixture, so that a μm of the length of photonic crystal fiber is not filled by with hollow-core fiber
B μm of relationship of length of GQDs-PVA are as follows: 0.5 a:b≤1 <.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109682756A (en) * | 2019-01-28 | 2019-04-26 | 苏州德睿电力科技有限公司 | A kind of fiber F-P cavity humidity sensor |
| CN110470328A (en) * | 2019-07-29 | 2019-11-19 | 东北大学 | A kind of optical fiber FP sensor and preparation method thereof that can be filled with Low Drift Temperature |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101614661A (en) * | 2009-07-24 | 2009-12-30 | 重庆大学 | Based on microprobe type hygrometer of Fabry-Perot interferometer and preparation method thereof |
| CN102768200A (en) * | 2012-08-14 | 2012-11-07 | 平湖波汇通信科技有限公司 | Optical fiber humidity sensor used on humidity detection device and manufacture method thereof |
| CN105300927A (en) * | 2015-10-22 | 2016-02-03 | 中国计量学院 | Optical fiber humidity sensor based on graphene oxide and polyvinyl alcohol composite film |
| CN106124574A (en) * | 2016-06-16 | 2016-11-16 | 西南交通大学 | Graphene oxide quantum dot humidity sensor and preparation method thereof |
| CN108332654A (en) * | 2018-01-25 | 2018-07-27 | 东北大学 | A kind of chamber grows controllable mini optical fibre Fabry-platinum Luo Gan's interferometer production method |
-
2018
- 2018-08-14 CN CN201810920714.2A patent/CN108982415B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101614661A (en) * | 2009-07-24 | 2009-12-30 | 重庆大学 | Based on microprobe type hygrometer of Fabry-Perot interferometer and preparation method thereof |
| CN102768200A (en) * | 2012-08-14 | 2012-11-07 | 平湖波汇通信科技有限公司 | Optical fiber humidity sensor used on humidity detection device and manufacture method thereof |
| CN105300927A (en) * | 2015-10-22 | 2016-02-03 | 中国计量学院 | Optical fiber humidity sensor based on graphene oxide and polyvinyl alcohol composite film |
| CN106124574A (en) * | 2016-06-16 | 2016-11-16 | 西南交通大学 | Graphene oxide quantum dot humidity sensor and preparation method thereof |
| CN108332654A (en) * | 2018-01-25 | 2018-07-27 | 东北大学 | A kind of chamber grows controllable mini optical fibre Fabry-platinum Luo Gan's interferometer production method |
Non-Patent Citations (4)
| Title |
|---|
| JEN-YAO CHANG等: "Simultaneous Measurement of Relative Humidity and Temperature by Using Polymer Fiber Fizeau/Airgap Fiber Fabry-Perot Interferometers", 《THE 23RD OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE》 * |
| JITENDRA NARAYAN DASH等: "Fabry–Perot based strain insensitive photonic crystal fiber modal interferometer for inline sensing of refractive index and temperature", 《APPLIED OPTICS》 * |
| YONG WANG等: "Simultaneous Measurement of Temperature and Relative Humidity Based on FBG and FP Interferometer", 《IEEE PHOTONICS TECHNOLOGY LETTERS》 * |
| 王孝弟: "石墨烯量子点基复合湿敏膜的制备与特性研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109682756A (en) * | 2019-01-28 | 2019-04-26 | 苏州德睿电力科技有限公司 | A kind of fiber F-P cavity humidity sensor |
| CN109682756B (en) * | 2019-01-28 | 2024-05-10 | 苏州德睿电力科技有限公司 | Optical fiber F-P cavity humidity sensor |
| CN110470328A (en) * | 2019-07-29 | 2019-11-19 | 东北大学 | A kind of optical fiber FP sensor and preparation method thereof that can be filled with Low Drift Temperature |
| CN110470328B (en) * | 2019-07-29 | 2021-07-09 | 东北大学 | Optical fiber FP sensor with low temperature drift and filling function and preparation method thereof |
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