CN110726681A - Integrated optical fiber Bragg grating sensor for detecting temperature, humidity and pH value - Google Patents
Integrated optical fiber Bragg grating sensor for detecting temperature, humidity and pH value Download PDFInfo
- Publication number
- CN110726681A CN110726681A CN201911032871.0A CN201911032871A CN110726681A CN 110726681 A CN110726681 A CN 110726681A CN 201911032871 A CN201911032871 A CN 201911032871A CN 110726681 A CN110726681 A CN 110726681A
- Authority
- CN
- China
- Prior art keywords
- bragg grating
- fiber bragg
- temperature
- humidity
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000013307 optical fiber Substances 0.000 title claims description 5
- 239000000835 fiber Substances 0.000 claims abstract description 67
- 238000001514 detection method Methods 0.000 claims abstract description 38
- 239000000463 material Substances 0.000 claims abstract description 17
- 239000000017 hydrogel Substances 0.000 claims abstract description 13
- 229920000642 polymer Polymers 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 239000002086 nanomaterial Substances 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 6
- 239000002041 carbon nanotube Substances 0.000 claims description 5
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 5
- 229920002845 Poly(methacrylic acid) Polymers 0.000 claims description 3
- 229920002125 Sokalan® Polymers 0.000 claims description 3
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 3
- 229910021389 graphene Inorganic materials 0.000 claims description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 239000004584 polyacrylic acid Substances 0.000 claims description 3
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 3
- 239000004800 polyvinyl chloride Substances 0.000 claims description 3
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 claims description 3
- 230000001235 sensitizing effect Effects 0.000 claims description 2
- 229920002379 silicone rubber Polymers 0.000 claims description 2
- 230000002708 enhancing effect Effects 0.000 claims 1
- 239000002689 soil Substances 0.000 abstract description 17
- 238000000034 method Methods 0.000 abstract description 6
- 238000011897 real-time detection Methods 0.000 abstract description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000002861 polymer material Substances 0.000 description 3
- 230000010259 detection of temperature stimulus Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002071 nanotube Substances 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Biochemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention belongs to the technical field of sensors, and particularly relates to an integrated fiber Bragg grating sensor for detecting temperature, humidity and pH values. The device solves the problems of complex procedure, low signal precision and the like existing in the prior art of independently measuring the soil temperature, the soil humidity and the soil pH value, and comprises a temperature detection unit, a humidity detection unit and a pH detection unit which are arranged on a sensing unit; the sensing unit is a fiber Bragg grating; the temperature detection unit is a first section of fiber Bragg grating; the humidity detection unit is a polymer layer which is wrapped on the second section of fiber Bragg grating and is sensitive to moisture and a nanometer material layer which is wrapped on the polymer layer which is sensitive to moisture; the pH detection unit comprises a hydrogel layer which is wrapped on the third section of fiber Bragg grating and is sensitive to the pH value and a nanometer material layer which is wrapped on the hydrogel layer which is sensitive to the pH value. The real-time detection of the temperature, the moisture and the pH value of the soil can be realized simultaneously by inserting the sensing unit into the soil.
Description
Technical Field
The invention belongs to the technical field of sensors, and particularly relates to an integrated fiber Bragg grating sensor for detecting temperature, humidity and pH values.
Background
With the rapid development of the industrialization process and the large-scale use of pesticides, the soil pollution is more and more serious; the soil quality of the soil largely determines the quality of the agricultural product growth. In order to improve soil quality, the detection of main parameters of soil is a necessary technical means. Mainly comprises the detection of temperature, humidity and pH value. The existing soil temperature, humidity and pH are mostly measured separately by adopting temperature, humidity and pH electric sensors respectively, and the method has the following defects:
1) independent measurement and management, complex procedure; 2) independently inserting sensing equipment for multiple times, and influencing the state of soil around the plant; 3) if multi-point detection is to be realized, a plurality of sensing points are required to be arranged, and power supply and signal transmission become more complex; 4) the electric sensor is easily interfered by external electromagnetic field, is easily corroded, and has limited service life (generally not more than 3 years). 5) The uniformity of position and time cannot be guaranteed through independent measurement, and meanwhile, the measured values of humidity and pH value are influenced by the change of temperature measured value, and the influence of temperature on other two measured values needs to be considered.
Disclosure of Invention
In order to solve the problems existing in the prior art of independently measuring the temperature, the humidity and the pH value of soil, the invention provides an integrated optical fiber sensor capable of simultaneously detecting the temperature, the moisture and the pH value, which can simultaneously detect three parameters of the temperature, the humidity and the pH value, detect the humidity and the pH value at the same temperature and eliminate the influence of the temperature on the humidity and the pH value.
The invention provides an integrated fiber Bragg grating sensor for detecting temperature, humidity and pH value, which comprises a sensing unit and is characterized in that: the device also comprises a temperature detection unit, a humidity detection unit and a pH detection unit which are arranged on the sensing unit;
the sensing unit is a fiber Bragg grating; dividing the fiber Bragg grating into three sections, namely a first section of fiber Bragg grating, a second section of fiber Bragg grating and a third section of fiber Bragg grating;
the temperature detection unit is a first section of fiber Bragg grating;
the humidity detection unit is a polymer which is sensitive to moisture and wrapped on the second section of fiber Bragg grating and a nanometer material layer wrapped on the polymer layer which is sensitive to moisture;
the pH detection unit comprises hydrogel which is sensitive to the pH value and wrapped on the third section of fiber Bragg grating and a nanometer material layer which is wrapped on the hydrogel layer which is sensitive to the pH value.
Further, in order to increase the sensitivity of the temperature detection unit to temperature, the temperature detection unit further comprises a temperature-sensitizing nanomaterial layer wrapped on the first section of fiber bragg grating.
Further, the temperature sensitizing material is a carbon nanotube material.
Further, the polymer sensitive to moisture is PMMA, PVC or silica gel material; the nano material is ferroferric oxide, a carbon nano tube or graphene.
Further, the total layer thickness of the polymer layer sensitive to moisture and the nanometer material layer is 10um to 50 um.
Further, the hydrogel sensitive to pH is polyacrylic acid, polymethacrylic acid or polyacrylamide.
Further, the total thickness of the hydrogel layer sensitive to the pH value and the nanometer material is 10um-50 um.
Furthermore, the lengths of the first section of fiber bragg grating, the second section of fiber bragg grating and the third section of fiber bragg grating are equal.
The invention also provides another integrated fiber Bragg grating sensor for detecting the temperature, the humidity and the pH value, which is characterized in that: the integrated fiber Bragg grating sensor for detecting the temperature, the humidity and the pH value comprises a reticular metal pipe and the integrated fiber Bragg grating sensor which is positioned in the reticular metal pipe and is used for detecting the temperature, the humidity and the pH value.
The invention also provides another integrated fiber Bragg grating sensor for detecting the temperature, the humidity and the pH value, which comprises a plurality of integrated fiber Bragg grating sensors for detecting the temperature, the humidity and the pH value, which are connected in series through optical fibers.
The invention has the beneficial effects that:
1. the invention selects the fiber Bragg grating as the sensing unit, one grating is provided with three adjacent detection units which are respectively used for monitoring the temperature, the humidity and the pH value in real time, the sensing unit is reliably packaged (packaged by a reticular metal tube) and inserted into the soil, the real-time detection of the temperature, the moisture and the pH value of the soil can be realized at the same time, the detection process is simple and convenient, the measurement of three groups of parameters can be realized by inserting once, and the service life of the fiber sensor is long.
2. The invention takes the simultaneously detected temperature data as the temperature reference for detecting the humidity and the pH value, eliminates the influence of the change of the temperature measured value on the measured values of the humidity and the pH value, and improves the detection precision of the humidity and the pH value.
3. According to the invention, a plurality of sensors are connected in series, so that the temperature, the humidity and the pH value of a plurality of positions can be detected.
Drawings
Fig. 1 is a schematic structural diagram of an integrated fiber bragg grating sensor for detecting temperature, humidity and pH values in a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of an integrated fiber bragg grating sensor for detecting temperature, humidity and pH in the second embodiment of the present invention.
The reference numbers in the figures are: 1-a temperature detection unit, 2-a humidity detection unit, 3-a pH detection unit and 4-an integrated fiber Bragg grating sensor;
Detailed Description
The invention selects the fiber Bragg grating as a sensing unit, three adjacent detection units are arranged on one fiber Bragg grating, one section of the fiber Bragg grating is used for detecting the soil temperature in real time, the other section of the fiber Bragg grating is used for realizing the real-time measurement of moisture by coating a polymer material sensitive to moisture, the last section of the fiber Bragg grating is used for realizing the real-time detection of the pH value by coating hydrogel sensitive to the pH value, the lengths of the three sections of the fiber Bragg gratings can be equal, and the specific length can also be set according to the actual requirement. By reliably packaging the sensing unit, such as packaging by using a mesh metal pipe, the sensing unit can be inserted into soil to simultaneously realize real-time detection of the temperature, the moisture and the pH value of the soil.
The invention is further described with reference to the following figures and specific embodiments.
Example one
As can be seen from fig. 1, the integrated fiber bragg grating sensor for detecting temperature, humidity and pH value in this embodiment includes a sensing unit formed by a fiber bragg grating, and a temperature detecting unit 1, a humidity detecting unit 2 and a pH detecting unit 3 sequentially disposed on the fiber bragg grating; the fiber bragg gratings may each be divided into three segments. The first section may be a bare grating for detecting temperature, and may also be coated with a temperature-sensitizing material, such as carbon nanotubes, to improve the temperature sensitivity of the section. Coating a moisture-sensitive polymer material on the second section for detecting humidity, wherein the moisture-sensitive polymer material comprises PMMA, PVC or silicon rubber; in order to further improve the humidity detection capability, a nano material, such as ferroferric oxide, a nanotube or graphene, may be sprayed on the surface of the polymer layer sensitive to moisture, and the total thickness of the polymer layer sensitive to moisture and the nano material layer in this embodiment is 10um to 50um, and in other embodiments, may be a value within a range of 10um to 50 um. And the third section is coated with a pH-sensitive hydrogel which can be polyacrylic acid, polymethacrylic acid or polyacrylamide to realize pH value detection.
The thickness of the hydrogel layer and the nano material layer can also be within the range of 10um to 50 um.
According to the sensor, three wavelength peak values can be split during detection due to the difference of three coating materials, a broadband light source emitted by a demodulator is reflected back after passing through a sensing head, the simultaneous detection of temperature, humidity and pH value can be realized by detecting the drift of the three wavelength peak values, and the wave peak for temperature detection is used as the temperature reference for detecting the humidity and the pH value.
Example two
As shown in fig. 2, the integrated fiber bragg grating sensor for detecting temperature, humidity and pH in this embodiment includes n sensors connected in series through a connecting fiber, so as to detect the temperature, humidity and pH at multiple positions, and the sensors may be wavelength division multiplexed by using a wavelength division multiplexing technique, and the wavelengths of light reflected from the sensing heads 1 to n are input to a demodulator for processing.
Claims (10)
1. The utility model provides an integral type optic fibre bragg grating sensor for humiture, pH value detect, includes sensing element, its characterized in that: the device also comprises a temperature detection unit, a humidity detection unit and a pH detection unit which are arranged on the sensing unit;
the sensing unit is a fiber Bragg grating; dividing the fiber Bragg grating into three sections, namely a first section of fiber Bragg grating, a second section of fiber Bragg grating and a third section of fiber Bragg grating;
the temperature detection unit is a first section of fiber Bragg grating;
the humidity detection unit is a polymer layer which is wrapped on the second section of fiber Bragg grating and sensitive to moisture and a nanometer material layer which is wrapped on the polymer layer sensitive to moisture;
the pH detection unit comprises a hydrogel layer which is wrapped on the third section of fiber Bragg grating and sensitive to the pH value and a nanometer material layer which is wrapped on the hydrogel layer sensitive to the pH value.
2. The integrated fiber bragg grating sensor for detecting the temperature, the humidity and the pH value according to claim 1, wherein: the temperature detection unit also comprises a temperature sensitivity enhancing material layer wrapped on the first section of fiber Bragg grating.
3. The integrated fiber bragg grating sensor for detecting the temperature, the humidity and the pH value as claimed in claim 2, wherein: the temperature sensitizing material is a carbon nano tube.
4. The integrated fiber bragg grating sensor for detecting the temperature, the humidity and the pH value as claimed in claim 3, wherein: the polymer sensitive to moisture is PMMA, PVC or silicon rubber material; the nano material is ferroferric oxide, a carbon nano tube or graphene.
5. The integrated fiber bragg grating sensor for temperature, humidity and pH detection according to claim 4, wherein: the total layer thickness of the moisture sensitive polymer layer and the nanomaterial layer is 10-50 um.
6. The integrated fiber bragg grating sensor for temperature, humidity and pH detection according to claim 5, wherein: the hydrogel sensitive to the pH value is polyacrylic acid, polymethacrylic acid or polyacrylamide.
7. The integrated fiber bragg grating sensor for temperature, humidity and pH detection according to claim 6, wherein: the thickness of the hydrogel layer sensitive to the pH value and the nanometer material layer is 10-50 um.
8. The integrated fiber bragg grating sensor for detecting the temperature, the humidity and the pH value according to claim 7, wherein: the lengths of the first section of fiber Bragg grating, the second section of fiber Bragg grating and the third section of fiber Bragg grating are equal.
9. The utility model provides an integral type optic fibre bragg grating sensor for humiture, pH value detect which characterized in that: the integrated fiber Bragg grating sensor for detecting the temperature, the humidity and the pH value comprises a reticular metal pipe and the integrated fiber Bragg grating sensor which is positioned in the reticular metal pipe and used for detecting the temperature, the humidity and the pH value according to any one of claims 1 to 8.
10. The utility model provides an integral type optic fibre bragg grating sensor for humiture, pH value detect which characterized in that: the integrated fiber Bragg grating sensor for temperature, humidity and pH detection comprises n integrated fiber Bragg grating sensors which are connected in series through optical fibers and used for detecting the temperature, the humidity and the pH value, wherein n is a positive integer greater than or equal to 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911032871.0A CN110726681A (en) | 2019-10-28 | 2019-10-28 | Integrated optical fiber Bragg grating sensor for detecting temperature, humidity and pH value |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911032871.0A CN110726681A (en) | 2019-10-28 | 2019-10-28 | Integrated optical fiber Bragg grating sensor for detecting temperature, humidity and pH value |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110726681A true CN110726681A (en) | 2020-01-24 |
Family
ID=69222314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911032871.0A Pending CN110726681A (en) | 2019-10-28 | 2019-10-28 | Integrated optical fiber Bragg grating sensor for detecting temperature, humidity and pH value |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110726681A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112683416A (en) * | 2020-12-15 | 2021-04-20 | 电子科技大学 | Distributed optical fiber temperature sensing system based on graphene optical fiber |
| CN112903138A (en) * | 2021-01-19 | 2021-06-04 | 汕头大学 | Sensor detection system |
| CN116876264A (en) * | 2023-07-11 | 2023-10-13 | 浙江大学 | Intelligent geotechnical fiber grille, processing method and digital twin manufacturing platform |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050265649A1 (en) * | 2004-05-31 | 2005-12-01 | Petroleo Brasileiro S.A. - Petrobras | Optical fiber pH sensor |
| CN202869694U (en) * | 2012-11-13 | 2013-04-10 | 长城信息产业股份有限公司 | Fiber Bragg grating temperature/humidity sensor |
| CN103033489A (en) * | 2012-12-14 | 2013-04-10 | 中国计量学院 | PH value sensor based on tilted fiber Bragg grating girdle amplification welding technology |
| CN105136741A (en) * | 2015-04-30 | 2015-12-09 | 西北工业大学 | Graphene coated tilted fiber grating-based liquid refractive index sensor |
| CN105259139A (en) * | 2015-10-22 | 2016-01-20 | 中国计量学院 | Tilted fiber bragg grating humidity sensor based on oxidized graphene and agarose composite film |
| CN105352554A (en) * | 2015-12-02 | 2016-02-24 | 广东有线广播电视网络有限公司 | Fiber grating pH/temperature sensor, preparation method and detection system |
| CN106248622A (en) * | 2016-10-19 | 2016-12-21 | 中国计量大学 | A kind of Based PC F air chamber and the relative humidity sensor of inclined optical fiber grating |
| 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 |
| CN109001121A (en) * | 2018-08-01 | 2018-12-14 | 河南工业大学 | A kind of distributed fiber grating nutrient solution pH on-line detecting system and detection method |
| CN211602899U (en) * | 2019-10-28 | 2020-09-29 | 中国科学院西安光学精密机械研究所 | Integrated fiber Bragg grating sensor and sensing device for temperature, humidity and pH value detection |
-
2019
- 2019-10-28 CN CN201911032871.0A patent/CN110726681A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050265649A1 (en) * | 2004-05-31 | 2005-12-01 | Petroleo Brasileiro S.A. - Petrobras | Optical fiber pH sensor |
| CN202869694U (en) * | 2012-11-13 | 2013-04-10 | 长城信息产业股份有限公司 | Fiber Bragg grating temperature/humidity sensor |
| CN103033489A (en) * | 2012-12-14 | 2013-04-10 | 中国计量学院 | PH value sensor based on tilted fiber Bragg grating girdle amplification welding technology |
| CN105136741A (en) * | 2015-04-30 | 2015-12-09 | 西北工业大学 | Graphene coated tilted fiber grating-based liquid refractive index sensor |
| CN105259139A (en) * | 2015-10-22 | 2016-01-20 | 中国计量学院 | Tilted fiber bragg grating humidity sensor based on oxidized graphene and agarose composite film |
| CN105352554A (en) * | 2015-12-02 | 2016-02-24 | 广东有线广播电视网络有限公司 | Fiber grating pH/temperature sensor, preparation method and detection system |
| CN106248622A (en) * | 2016-10-19 | 2016-12-21 | 中国计量大学 | A kind of Based PC F air chamber and the relative humidity sensor of inclined optical fiber grating |
| 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 |
| CN109001121A (en) * | 2018-08-01 | 2018-12-14 | 河南工业大学 | A kind of distributed fiber grating nutrient solution pH on-line detecting system and detection method |
| CN211602899U (en) * | 2019-10-28 | 2020-09-29 | 中国科学院西安光学精密机械研究所 | Integrated fiber Bragg grating sensor and sensing device for temperature, humidity and pH value detection |
Non-Patent Citations (1)
| Title |
|---|
| 宋韵 等: "基于非对称折变型超长周期光纤光栅的湿度传感器", 中国激光, vol. 36, no. 08, pages 2042 - 2045 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112683416A (en) * | 2020-12-15 | 2021-04-20 | 电子科技大学 | Distributed optical fiber temperature sensing system based on graphene optical fiber |
| CN112903138A (en) * | 2021-01-19 | 2021-06-04 | 汕头大学 | Sensor detection system |
| CN116876264A (en) * | 2023-07-11 | 2023-10-13 | 浙江大学 | Intelligent geotechnical fiber grille, processing method and digital twin manufacturing platform |
| CN116876264B (en) * | 2023-07-11 | 2023-12-12 | 浙江大学 | Intelligent geotechnical fiber grille, processing method and digital twin manufacturing platform |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110726681A (en) | Integrated optical fiber Bragg grating sensor for detecting temperature, humidity and pH value | |
| CN205262638U (en) | A two core photonic crystal optical fiber sensor for being directed at temperature and simultaneous measurement of meeting an emergency | |
| CN102384725B (en) | Tunnel convergence deformation distribution fiber monitoring method and system thereof | |
| CN103674117B (en) | Measure entirely method and device with weak optical fiber Bragg grating temperature and strain based on Raman scattering simultaneously | |
| CN102519499A (en) | Micro-structure fiber optic Fabry-Perot cavity quasi based quasi-distributed sensor | |
| CN104236602B (en) | Full-optical-fiber sensor capable of measuring temperature and humidity at same time | |
| CN205691490U (en) | A kind of cascade connection type FPI hydrogen gas sensor based on cursor effect | |
| CN103439766B (en) | A kind of space division multiplexing method of multi-core fiber | |
| CN207147667U (en) | A kind of back-shaped strip sensor of carbon fiber prepreg encapsulation | |
| KR20110007535A (en) | Method and apparatus for detecting and evaluating gas component in mixed gases | |
| CN103076108A (en) | Novel power cable conductor temperature measuring sensor based on FBG (fiber bragg grating) | |
| An et al. | Relative humidity sensor based on SMS fiber structure with polyvinyl alcohol coating | |
| CN112212898B (en) | Intelligent skin based on small-size distributed optical fiber sensing array | |
| CN107631739B (en) | Fiber grating vibration/stress composite sensor | |
| CN211602899U (en) | Integrated fiber Bragg grating sensor and sensing device for temperature, humidity and pH value detection | |
| CN100593688C (en) | Method for on-line measuring microbiological film thickness by fiber prague grating sensor | |
| CN110696179A (en) | Method for laying concrete sensing optical fiber | |
| CN104374515A (en) | Arrangement structure of optical fiber bundles in probe of reflection type optical fiber pressure sensor | |
| CN109974755A (en) | A kind of flexible multi-parameter sensor and its preparation based on fiber grating principle | |
| JP7177991B2 (en) | MONITORING HUMIDITY MEASUREMENT SYSTEM AND MONITORING HUMIDITY MEASUREMENT METHOD | |
| CN101923057B (en) | BOTDR (Brillouin Optical Time-Domain Reflectometer) fiber optical corrosive sensor | |
| CN105333975A (en) | Method for sensing temperature of sensing optical cables | |
| CN115060187B (en) | Distributed optical fiber strain sensing performance detection system and method | |
| CA2739108A1 (en) | Flexible fibre optic deformation sensor system and method | |
| CN103774702A (en) | Cast-in-place X-type concrete pile body strain monitoring method based on FBG (Fiber Bragg Grating) sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |