CN109738373A - PH sensor and preparation method thereof based on photonic crystal fiber - Google Patents
PH sensor and preparation method thereof based on photonic crystal fiber Download PDFInfo
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- CN109738373A CN109738373A CN201910060392.3A CN201910060392A CN109738373A CN 109738373 A CN109738373 A CN 109738373A CN 201910060392 A CN201910060392 A CN 201910060392A CN 109738373 A CN109738373 A CN 109738373A
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Abstract
A kind of pH sensor based on photonic crystal fiber, including one section of photonic crystal fiber, which is characterized in that the welding of described photonic crystal fiber one end has single mode optical fiber, there is a recessed portion at the fibre core of single mode optical fiber on face of weld, a circle depressed area is formed at face of weld extramural cladding；It is enclosed with hydrogel outside depressed area, carries out pH value sensing using the reflectance spectrum figure of the structure.
Description
Technical field
The invention belongs to field of fiber optics, more particularly to pH sensor and its production based on photonic crystal fiber
Method.
Background technique
Fibre optical sensor is with many good characteristics, it can be achieved that the measurement work under complex environment has very extensive answer
With value.It has the characteristics that electromagnetism interference, anti-radiation, high sensitivity, light-weight, insulation explosion-proof, corrosion-resistant, and fiber optic ruler
It is very little small, there is good optical transmission performance.In various types of fibre optical sensors, it is interference-type light that precision is highest at present
Fiber sensor.Wherein optical fiber FP sensor (Fabry-Pérot sensor) is because only with an optical fiber and structure is simply small in size, dynamic
State range is big, receives significant attention in biomedicine, magnetic field, MEMS.
Optical fiber FP sensor mainly includes extrinsic type and Intrinsical two major classes.The optical fiber FP sensor of extrinsic type structure
Be to be formed using optical fiber and one with the non-optical fiber original part of reflecting surface structure；The processing method one of Intrinsical optical fiber FP structure
As to form a pair of of high reflection mirror, and then coelosis by plated film, the change means such as refractive index using on optical fiber.
Summary of the invention
The present invention provides a kind of preparation methods of pH sensor based on photonic crystal fiber combination chemical attack, finally
The preparation of sensor is completed in sensitive zones coating hydrogel, wherein the cavity between photonic crystal fiber and single mode optical fiber is FP
Chamber.
The present invention is achieved through the following technical solutions:
A kind of pH sensor based on photonic crystal fiber, including one section of photonic crystal fiber, the photonic crystal fiber one
End welding has single mode optical fiber, has a recessed portion at the fibre core of single mode optical fiber on face of weld, forms at face of weld extramural cladding
One circle depressed area；It is enclosed with hydrogel outside depressed area, carries out pH value sensing using the reflectance spectrum figure of the structure.
It is further to improve, the pH sensor and use wideband light source for light source.
A kind of production method of the pH sensor based on photonic crystal fiber, includes the following steps:
Step 1) single mode optical fiber coat is removed, with cutting flat with after alcohol wipe, section is under the hydrofluoric acid of 40% mass fraction
Ultrasonic cleaning processing is carried out to corrosion end face after corrosion 15 minutes；
Step 2) by the single mode optical fiber handled well welding coelosis opposite with the photonic crystal fiber that an end face is cut flat with, welding is completed
Afterwards, a circle gas subsidence area is formed at extramural cladding；
Step 3) in the clad section coating hydrogel of weld, utilize the reflectance spectrum figure of the structure to carry out pH value sensing.
Compared with prior art, the invention has the following advantages that
All -fiber formula is used using the pH sensor based on photonic crystal fiber of technical method provided by the present invention production
Structure can avoid influence of the electromagnetic interference to testing result.The sensor reliability is high simultaneously, corrosion-resistant, when use only need by
It is partially disposed in testing liquid where sensor, building for test macro can be completed in other end connection spectrometer, by through passing
The mode of the free spectrum width of sensor reflectance spectrum detects temperature change, high sensitivity.Detailed description of the invention
Fig. 1 is sensor manufacturing process figure；
Fig. 2 is pH- spectrum data gathering schematic diagram；
Fig. 3 is the received reflectance spectrum of spectroanalysis instrument.
Specific embodiment
In order to make those skilled in the art more fully understand technical solution of the present invention, and make features described above of the invention,
Purpose and advantage are more clear understandable, are further explained explanation to the present invention now in conjunction with embodiment, it is noted that herein
All embodiments listed are merely illustrative, are not meant to be defined the scope of the invention.
Embodiment 1:
A kind of pH sensor manufacturing process schematic diagram based on photonic crystal fiber combination chemical attack is as shown in Figure 1, it is walked
It is rapid for single mode optical fiber coat is removed, with being cut flat with after alcohol wipe, after corroding 15 minutes under the hydrofluoric acid of 40% mass fraction
Ultrasonic cleaning processing is carried out to corrosion end face, welding coelosis opposite with the photonic crystal fiber that other end is cut flat with；Finally passing
The clad section in sensillary area domain applies hydrogel, completes the preparation of sensor.
Temperature sensor detection temperature system of the invention is as shown in Figure 2.Fibre optical sensor is immersed in testing liquid, is led to
Fiber optical circulator is crossed to be connected with spectroanalysis instrument.The spectroanalysis instrument that spectral analysis apparatus has used Yokogawa company to produce,
The acquisition of reflectance spectrum is carried out in this experiment；FP chamber is transmitted to spectrometer through fiber optical circulator, by the reflection interference spectrum of FP.
Fibre optical sensor is immersed in testing liquid, and the variation of pH value is perceived by its spectrum change.
Reflectance spectrum in experiment is as shown in Figure 3.When extraneous pH value changes, reflectance spectrum spectral line can drift about,
Recording certain characteristic peak, high-acruracy survey to pH value can be realized in corresponding wavelength value at various ph values.
Claims (3)
1. a kind of pH sensor based on photonic crystal fiber, including one section of photonic crystal fiber, which is characterized in that the light
The welding of photonic crystal fiber one end has single mode optical fiber, there is a recessed portion at the fibre core of single mode optical fiber on face of weld, outside face of weld
A circle depressed area is formed at covering；It is enclosed with hydrogel outside depressed area, carries out pH value using the reflectance spectrum figure of the structure
Sensing.
2. a kind of pH sensor based on photonic crystal fiber as described in claim 1, which is characterized in that the pH value passes
Sensor and use wideband light source for light source.
3. a kind of production method of the pH sensor based on photonic crystal fiber, which comprises the steps of:
Step 1) single mode optical fiber coat is removed, with cutting flat with after alcohol wipe, section is under the hydrofluoric acid of 40% mass fraction
Ultrasonic cleaning processing is carried out to corrosion end face after corrosion 15 minutes
Step 2) by the single mode optical fiber handled well welding coelosis opposite with the photonic crystal fiber that an end face is cut flat with, welding is completed
Afterwards, a circle gas subsidence area is formed at extramural cladding；
Step 3) in the clad section coating hydrogel of weld, utilize the reflectance spectrum figure of the structure to carry out pH value sensing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910060392.3A CN109738373A (en) | 2019-01-22 | 2019-01-22 | PH sensor and preparation method thereof based on photonic crystal fiber |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910060392.3A CN109738373A (en) | 2019-01-22 | 2019-01-22 | PH sensor and preparation method thereof based on photonic crystal fiber |
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| CN109738373A true CN109738373A (en) | 2019-05-10 |
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| CN201910060392.3A Pending CN109738373A (en) | 2019-01-22 | 2019-01-22 | PH sensor and preparation method thereof based on photonic crystal fiber |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112964640A (en) * | 2021-03-30 | 2021-06-15 | 大连理工大学 | Optical fiber sensor for monitoring concrete carbonization depth |
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| CN112964640A (en) * | 2021-03-30 | 2021-06-15 | 大连理工大学 | Optical fiber sensor for monitoring concrete carbonization depth |
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