CN109974755B - Flexible multi-parameter sensor based on fiber grating principle and preparation thereof - Google Patents
Flexible multi-parameter sensor based on fiber grating principle and preparation thereof Download PDFInfo
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- CN109974755B CN109974755B CN201910274473.3A CN201910274473A CN109974755B CN 109974755 B CN109974755 B CN 109974755B CN 201910274473 A CN201910274473 A CN 201910274473A CN 109974755 B CN109974755 B CN 109974755B
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- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000004205 dimethyl polysiloxane Substances 0.000 claims abstract description 19
- 235000013870 dimethyl polysiloxane Nutrition 0.000 claims abstract description 19
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims abstract description 19
- CXQXSVUQTKDNFP-UHFFFAOYSA-N octamethyltrisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C CXQXSVUQTKDNFP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000004987 plasma desorption mass spectroscopy Methods 0.000 claims abstract description 16
- 238000004806 packaging method and process Methods 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 5
- -1 polydimethylsiloxane Polymers 0.000 claims abstract description 3
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 3
- 239000010703 silicon Substances 0.000 claims abstract description 3
- 238000003466 welding Methods 0.000 claims description 5
- 230000001788 irregular Effects 0.000 claims description 4
- 239000000523 sample Substances 0.000 claims description 4
- 239000013307 optical fiber Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 9
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000009530 blood pressure measurement Methods 0.000 abstract description 2
- 238000009529 body temperature measurement Methods 0.000 abstract description 2
- 231100000956 nontoxicity Toxicity 0.000 abstract description 2
- 230000035699 permeability Effects 0.000 abstract description 2
- 229920006254 polymer film Polymers 0.000 abstract 2
- 238000005259 measurement Methods 0.000 description 9
- 238000009826 distribution Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
- G01D5/35309—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer
- G01D5/35316—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer using a Bragg gratings
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Abstract
The invention provides a flexible multi-parameter sensor based on a fiber grating principle and a preparation method thereof. The sensor comprises a plurality of bare fiber gratings welded together and an outer packaging layer PDMS film; the fused fiber bragg grating comprises three bare fiber bragg grating channels for measuring temperature, pressure and humidity; the outer packaging layer comprises a high polymer film which is used for packaging six fiber gratings for measuring temperature and pressure; the high molecular polymer film used in the invention is organic silicon, namely polydimethylsiloxane, has the advantages of no toxicity, high air permeability, hydrophobicity, waterproofness and high elasticity, and avoids the influence of humidity on temperature and pressure measurement. The fiber grating joints of each channel are respectively led out and connected with a broadband light source and a detection head, small temperature, pressure and humidity changes can cause the change of the wavelength of the transmission light in the channel, and a spectrometer is used for measuring the wavelength, so that the change of the temperature, the pressure and the humidity is detected.
Description
Technical Field
The invention relates to a sensor, in particular to a flexible multi-parameter sensor based on a fiber grating principle and a preparation method thereof.
Background
The conventional sensor is used as a professional device for collecting control point data, and the common single temperature sensor, single pressure sensor and single hygrometer have various types. An ideal temperature, pressure and humidity sensor should have the characteristics of low cost, simple preparation, strong universality and the like. The conventional sensor has a wide application prospect in industries such as electric power, automobiles, furniture, industrial manufacturing and the like, but most of the conventional temperature or pressure or humidity sensors are prepared on the basis of hard materials, are not suitable for data detection of human body surfaces or irregular curved surfaces, and have the problems of high processing cost, complex flow and the like. Meanwhile, most of the conventional sensors are mutually separated and independently measured, and one parameter or two parameters are singly measured. On one hand, the requirement of people for multi-parameter measurement cannot be met, and on the other hand, the subsequent design cost is increased.
In summary, it is desirable to provide a flexible temperature, pressure and humidity sensor which is easy to process, low in cost, and capable of meeting the requirement of multi-parameter measurement and being used for monitoring human health.
Disclosure of Invention
In order to meet the needs of the prior art, the invention provides a flexible multi-temperature pressure humidity sensor based on a fiber grating principle and a preparation method thereof.
The technical scheme of the invention is as follows:
the sensor includes a three-part fiber bragg grating that measures temperature, pressure, and humidity. The flexible multi-parameter sensor comprises a plurality of Bragg fiber gratings which are welded together and an outer packaging layer PDMS film; the fused fiber gratings comprise three Bragg fiber grating channels for measuring temperature, three Bragg fiber grating channels for measuring pressure and three Bragg fiber grating channels for measuring humidity; the outer packaging layer comprises a PDMS film which is used for packaging six fiber gratings for measuring temperature and pressure; the PDMS film used in the invention is organic silicon, namely polydimethylsiloxane, has the advantages of no toxicity, high air permeability, hydrophobicity, waterproofness and high elasticity, and avoids the influence of humidity on temperature and pressure measurement. The fiber grating joints of each channel are respectively led out and connected with a broadband light source and a detection head, small temperature, pressure and humidity changes can cause the change of the wavelength of the transmission light in the channel, and a spectrometer is used for measuring the wavelength, so that the change of the temperature, the pressure and the humidity is detected.
Preferably, the length of the two sides of the fiber core of the Bragg fiber grating is 300 mm.
Preferably, the vertical arrangement of the three bragg fiber gratings for measuring the temperature is located in the left column, and the latter one is 4-5cm away from the former one, as shown in fig. 1.
Preferably, the vertical rows of the three fiber bragg gratings for measuring pressure are longitudinally distributed in the right column, and the latter one is 4-5cm away from the former one, as shown in fig. 1.
Preferably, one of the three bragg fiber gratings for measuring humidity is distributed at the head ends of the two rows of middle positions, and the other two bragg fiber gratings are symmetrically distributed at the tail ends of the two rows of middle positions, are distributed left and right and are distributed in a 45-degree splayed shape.
Compared with the prior art, the manufacturing method has the advantages that 1, the welding technology and the fiber grating principle are applied, the operation is simple and convenient, the principle is easy to understand, the measured data are single, the wavelength measurement is realized, and the calculation and the understanding are convenient.
2. The invention can realize multi-fixed point omnibearing multi-parameter real-time measurement on the structure, and the measured data is comprehensive and accurate.
3. The raw material of the invention adopts the bare fiber grating, the cost is low, and the invention can be produced in large scale; meanwhile, the bare fiber grating can realize flexibility, is perfectly attached to an irregular surface such as a human body surface, and is applied to industries such as intelligent wearable equipment and electronic skin.
4. The preparation method of the sensor comprises the steps of welding the bare fiber grating with the lead wire of the probe by using an optical fiber welding machine, and packaging and fixing the fiber grating by using a PDMS film, thereby realizing flexible measurement capable of being attached to fabric.
Drawings
The invention is further described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural distribution diagram of a flexible multi-parameter sensor based on the fiber grating principle, which is shown in the embodiment of the invention by taking foot health parameter measurement as an example.
FIG. 2: the embodiment of the invention provides a flexible multi-parameter sensor structure three-dimensional section diagram based on a fiber grating principle.
Wherein, 1, the first temperature grating; 2, a second temperature grating; no. 3 temperature grating; 4, a first humidity grating; 5, a second humidity grating; 6, a first pressure grating; no. 7 second pressure grating; no. 8 pressure grating; 9: a third temperature and humidity grating and 10: a PDMS film.
Detailed Description
The following describes in detail embodiments of the present invention, which take the temperature, pressure and humidity parameters of the sole of a foot and the distribution structure of sensors as examples. Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout.
The invention provides an embodiment of a flexible multi-parameter sensor based on a fiber grating principle, which is shown in figure 1, and particularly comprises nine bare fiber bragg gratings serving as a main body and a PDMS film serving as an outer packaging layer, wherein the main body mainly comprises a first temperature grating 1, a second temperature grating 2, a third temperature grating 3, a first humidity grating 4, a second humidity grating 5, a first pressure grating 6, a second pressure grating 7, a third pressure grating 8 and a third humidity grating 9, and the outer packaging layer is a PDMS film 10. Wherein, temperature grating 1 for the first number, temperature grating 2 for the second number, temperature grating 3 for the third number, humidity grating 4 is located left side row, pressure grating 8 for the third number, pressure grating 7 for the second number, pressure grating 6 for the first number, humidity grating 5 is located right side row, four rows of gratings divide into two and are listed as respectively the one-to-one, be symmetric distribution, humidity grating 9 for the third number is located the head end central position of two rows, humidity grating 4 for the first number and humidity grating 5 symmetric distribution are in the tail end central position of two rows, control the distribution, be 45 "eight" word distribution. The PDMS film 10 is located at the bottom of nine fiber bragg gratings, and six fiber bragg gratings for measuring temperature and pressure are externally packaged.
In this embodiment, 9 fiber gratings were fusion-spliced to the probe joints by the fiber fusion splicer.
The fiber core parts of six Bragg fiber gratings for measuring temperature and pressure are packaged, calibration measurement of each parameter is carried out after the packaging is finished, the wavelength under the condition of not using temperature, pressure and humidity is separately measured by a spectrometer, the temperature, pressure and humidity parameters corresponding to the wavelength are calculated, and calibration is carried out.
And after calibration is finished, the sensor is finally externally packaged, nine fiber Bragg gratings are fixed, and meanwhile, the requirement of the detection working condition of the temperature and the pressure of the irregular surface is met.
In this embodiment, when the temperature changes, the broadband optical wavelength in the temperature fiber grating is permanently changed, and the temperature change is determined by the change of the wavelength measurement value.
In this embodiment, when the pressure changes, the broadband optical wavelength in the pressure fiber grating changes permanently, and then the pressure change is determined by the change of the wavelength measurement value.
In this embodiment, since the fiber gratings for measuring temperature and pressure are all encapsulated by the PDMS film, they are not affected by the change of humidity.
Finally, it should be noted that the described embodiments are merely illustrative of the present invention and do not represent a limitation of the scope of the invention, and all equivalent substitutions made on the spirit of the present invention are within the scope of the present invention.
Claims (3)
1. The utility model provides a flexible many parameter sensor based on fiber grating principle which characterized in that: the flexible multi-parameter sensor based on the fiber grating principle comprises a plurality of bare fiber gratings which are welded together and an outer packaging layer PDMS film; the fused fiber gratings comprise three bare fiber grating channels for measuring temperature, three bare fiber grating channels for measuring pressure and three bare fiber grating channels for measuring humidity; the outer packaging layer comprises a PDMS film which is used for packaging six fiber gratings for measuring temperature and pressure; the PDMS film is organic silicon, namely polydimethylsiloxane; the three vertical fiber Bragg gratings for measuring the temperature are longitudinally distributed on the left row, and the distance between the latter fiber Bragg grating and the former fiber Bragg grating is 4-5 cm; the three vertical Bragg optical fibers for measuring the pressure are longitudinally and respectively positioned in the right row, and the distance between the latter one and the former one is 4-5 cm; one of the three Bragg fiber gratings for measuring the humidity is distributed at the head end of the middle position of two rows, the other two Bragg fiber gratings are symmetrically distributed at the tail end of the middle position of two rows, and the three Bragg fiber gratings are distributed in a shape of a Chinese character 'ba' at an angle of 45 degrees from left to right;
welding nine fiber gratings with the joints of the probe head by using an optical fiber welding machine;
packaging the fiber core parts of the six Bragg fiber gratings for measuring temperature and pressure by using a PDMS film, calibrating and measuring each parameter after packaging, respectively and independently measuring the wavelength under different temperature, pressure and humidity conditions by using a spectrometer, calculating the temperature, pressure and humidity parameters corresponding to the wavelength, and calibrating;
and after calibration is finished, the sensor is finally externally packaged, nine fiber Bragg gratings are fixed, and meanwhile, the requirement of the detection working condition of the temperature and the pressure of the irregular surface is met.
2. The flexible multiparameter sensor based on the fiber grating principle as claimed in claim 1, wherein the fiber grating is a channel formed by fusing a bare Bragg fiber grating and a probe together, a main portion and two end connectors are reserved, and the length of two ends of a fiber core is 300 mm.
3. The flexible multiparameter sensor based on the fiber grating principle as claimed in claim 1, wherein the PDMS films are encapsulated on the fiber cores, and the PDMS films are added to the fiber cores of six Bragg fiber gratings for measuring temperature and pressure.
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| CN112641425A (en) * | 2019-10-12 | 2021-04-13 | 四川大学 | Design and preparation of wearable flexible multi-parameter sensor |
| CN112212898B (en) * | 2020-09-09 | 2022-05-27 | 山东科技大学 | Intelligent skin based on small-size distributed optical fiber sensing array |
| CN114018922B (en) * | 2021-11-04 | 2024-05-24 | 中国工程物理研究院激光聚变研究中心 | Micro-nano optical fiber humidity sensor and preparation method and application thereof |
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| CN204649334U (en) * | 2015-04-30 | 2015-09-16 | 武汉理工大学 | A kind of optical fiber optical grating array sensor |
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