CN211602899U - Integrated fiber Bragg grating sensor and sensing device for temperature, humidity and pH value detection - Google Patents
Integrated fiber Bragg grating sensor and sensing device for temperature, humidity and pH value detection Download PDFInfo
- Publication number
- CN211602899U CN211602899U CN201921822565.2U CN201921822565U CN211602899U CN 211602899 U CN211602899 U CN 211602899U CN 201921822565 U CN201921822565 U CN 201921822565U CN 211602899 U CN211602899 U CN 211602899U
- 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.)
- Active
Links
Images
Landscapes
- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
Abstract
The utility model belongs to the technical field of the sensor, concretely relates to integral type fiber bragg grating sensor and sensing device for humiture, pH value detect. 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 utility model belongs to the technical field of the sensor, concretely relates to an integral type optic fibre bragg grating sensor for humiture, pH value detect.
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.
SUMMERY OF THE UTILITY MODEL
In order to solve the above-mentioned problem that exists of carrying out the independent measurement to soil temperature, humidity and pH among the prior art, the utility model provides a can realize the integral type optical fiber sensor that temperature, moisture and pH value detected simultaneously, can detect temperature, humidity and the three parameter of pH simultaneously, detect humidity and pH value under same temperature, get rid of the influence of temperature to humidity and pH value.
The technical scheme of the utility model a provide an integral type optic fibre bragg grating sensor for humiture, pH value detect, including the sensing unit, its special character lies in: 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 utility model discloses still provide another kind of integral type optic fibre bragg grating sensor that is used for humiture, pH value to detect, its special character lies in: 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 utility model discloses still provide another kind of integral type optic fibre bragg grating sensor that is used for humiture, pH value to detect, include a plurality of foretell integral type optic fibre bragg grating sensors that are used for humiture, pH value to detect through the optic fibre series connection.
The utility model has the advantages that:
1. the utility model discloses choose optic fibre bragg grating for use as sensing unit, have the three detecting element who closes on a grating, be used for the real-time supervision of temperature, humidity and pH respectively, through carrying out reliable encapsulation (netted tubular metal resonator encapsulation) with this sensing element, can realize the real-time detection to the temperature of soil, moisture and pH value simultaneously in inserting soil, and testing process is simple, convenient, inserts the measurement that once can realize three group's parameters, and adopts optical fiber sensor long service life.
2. The utility model discloses the temperature data that will detect simultaneously consults as the temperature that humidity and pH value detected, and the measured value of eliminating humidity and pH value receives the influence that the temperature measurement value changed, improves the detection precision of humidity and pH value.
3. The utility model discloses a establish ties a plurality of above-mentioned sensors, realize the detection to the temperature, humidity and the pH value of a plurality of positions.
Drawings
Fig. 1 is a schematic structural view 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 an embodiment of the present invention provides an integrated fiber bragg grating sensor for detecting temperature, humidity and pH.
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 utility model discloses select optic fibre bragg grating as sensing element for use, there is the three detecting element who closes on an optic fibre bragg grating, one of them section optic fibre bragg grating is used for the real-time detection of soil temperature, one section is used for realizing the real-time measurement of moisture through the coating to the polymer material that moisture is sensitive, and last section is realized the real-time detection to the pH value through the coating to the sensitive aquogel of pH value, and the length of three-section optic fibre bragg grating can equal, also can set for specific length according to actual demand. 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 drawings 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 sensing device 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 sensing device 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 |
|---|---|---|---|
| CN201921822565.2U CN211602899U (en) | 2019-10-28 | 2019-10-28 | Integrated fiber Bragg grating sensor and sensing device for temperature, humidity and pH value detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921822565.2U CN211602899U (en) | 2019-10-28 | 2019-10-28 | Integrated fiber Bragg grating sensor and sensing device for temperature, humidity and pH value detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211602899U true CN211602899U (en) | 2020-09-29 |
Family
ID=72586443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921822565.2U Active CN211602899U (en) | 2019-10-28 | 2019-10-28 | Integrated fiber Bragg grating sensor and sensing device for temperature, humidity and pH value detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211602899U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110726681A (en) * | 2019-10-28 | 2020-01-24 | 中国科学院西安光学精密机械研究所 | Integrated optical fiber Bragg grating sensor for detecting temperature, humidity and pH value |
-
2019
- 2019-10-28 CN CN201921822565.2U patent/CN211602899U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110726681A (en) * | 2019-10-28 | 2020-01-24 | 中国科学院西安光学精密机械研究所 | Integrated optical fiber Bragg grating sensor for detecting temperature, humidity and pH value |
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 | |
| CN103439766B (en) | A kind of space division multiplexing method of multi-core fiber | |
| CN205691490U (en) | A kind of cascade connection type FPI hydrogen gas sensor based on cursor effect | |
| CN207147667U (en) | A kind of back-shaped strip sensor of carbon fiber prepreg encapsulation | |
| CN107121158B (en) | A kind of internal enclosed cantilever beam fiber-optic grating sensor | |
| CN105352554B (en) | A kind of fiber grating pH/ temperature sensors and preparation method and detection system | |
| CN103076108A (en) | Novel power cable conductor temperature measuring sensor based on FBG (fiber bragg grating) | |
| CN107246931B (en) | Fiber bragg grating transverse stress strain sensor and detection method | |
| CN103398800A (en) | Quasi-distributed fiber bragg grating temperature stress measuring system for large-size structure body | |
| CN211602899U (en) | Integrated fiber Bragg grating sensor and sensing device for temperature, humidity and pH value detection | |
| CN105301695A (en) | Fiber grating array sensitive optical cable and application method thereof | |
| CN107218900B (en) | A kind of PCCP strain testing method based on fiber grating strain detection technology | |
| CN102023061A (en) | Double-channel Brillouin optical fiber cable sensor | |
| CN107121726A (en) | Optical fiber dual sampling device and preparation method thereof | |
| CN105301729A (en) | High strength and temperature sensitive optical cable | |
| CN203502141U (en) | Optical fiber sensor for measuring lithium battery pack temperature | |
| CN112212898A (en) | Intelligent skin based on small-size distributed optical fiber sensing array | |
| CN110696179A (en) | Method for laying concrete sensing optical fiber | |
| CN208238740U (en) | The tapered optical fibre bending sensor of dual hump | |
| CN101923057B (en) | BOTDR (Brillouin Optical Time-Domain Reflectometer) fiber optical corrosive sensor | |
| US11280643B2 (en) | Monitoring humidity measurement system and monitoring humidity measurement method | |
| CN104374515A (en) | Arrangement structure of optical fiber bundles in probe of reflection type optical fiber pressure sensor | |
| CN211149293U (en) | Dry-jet wet-spinning carbon fiber precursor production line coagulation bath temperature intelligent control device | |
| 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 |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |