CN209589854U - A kind of coreless fiber hydrogen gas sensor based on fiber annular cavity-type BPM - Google Patents
A kind of coreless fiber hydrogen gas sensor based on fiber annular cavity-type BPM Download PDFInfo
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- CN209589854U CN209589854U CN201920325959.0U CN201920325959U CN209589854U CN 209589854 U CN209589854 U CN 209589854U CN 201920325959 U CN201920325959 U CN 201920325959U CN 209589854 U CN209589854 U CN 209589854U
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Abstract
The utility model discloses a kind of coreless fiber hydrogen gas sensor based on fiber annular cavity-type BPM, including laser, modulator, signal generator, 2 × 1 couplers, transmission fiber, it is coated with Pt/WO3Coreless fiber sensing head, gas chamber, photodetector, data collecting card and the PC machine of film；2 × 1 couplers include the first coupler and the second coupler；First coupler, the second coupler, is coated with Pt/WO at transmission fiber3The coreless fiber sensing head of film forms annular chamber；It is described to be coated with Pt/WO3The coreless fiber sensing head of film is by coreless fiber, Pt/WO3Film is constituted；Pt/WO3Film is reacted with hydrogen generates variations in refractive index, and the intensity in transmission of pulsed light changes correspondingly, and then influences the variation of ring-down time, and by measurement ring-down time variation, the high-sensitivity measurement of density of hydrogen may be implemented.The advantages that the utility model hydrogen gas sensor has not by light source influence of fluctuations, and fast response time, high sensitivity is at low cost, safe and reliable.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, in particular to a kind of centreless light based on fiber annular cavity-type BPM
Fine hydrogen gas sensor.
Background technique
Hydrogen is widely used as a kind of novel clean energy resource in the fields such as petrochemical industry and aerospace.But
Hydrogen molecule is small and volatile, so easily leaking during production, storage, transport and use；And when hydrogen is dense
When degree is within the scope of 4%-75%, encountering open fire even electrostatic will explode, it is therefore desirable to a kind of response quickly and safety can
The hydrogen gas sensor leaned on detects the leakage of hydrogen.
Optical-fiber type hydrogen gas sensor is that the quick material of hydrogen is coated on optical fibre device, and when density of hydrogen changes, the quick material of hydrogen is just
It can react that fiber middle light signal is made to change, by obtaining the dense of hydrogen to the detection of optical signal knots modification
Degree.Optical-fiber type hydrogen gas sensor is broadly divided into wavelength modulation type hydrogen gas sensor and phase modulation-type hydrogen gas sensor at present, this
Two class hydrogen gas sensors use light as detection and transmission signal, and it is hidden to avoid the existing safety of traditional electric transducer itself
Suffer from, but since the above-mentioned detection to optical signal is required to using spectrometer, lead to that it is expensive, and its accuracy of measurement is easy
By the interference of light source fluctuation.
Fiber annular cavity attenuation and vibration technique is a kind of new optical fiber sensing technology.This technology is believed light using photodetector
Number it is converted into electric signal, then by oscillograph sample record, detection is ring-down time, avoids the influence of light source fluctuation；
Compared with traditional spectral technique, this technique avoids the uses of spectrometer, so that system overall cost is low, and the response time
It is short, there can be very strong advantage in quick detection, line detection.
Utility model content
The purpose of this utility model is: being declined in view of the deficienciess of the prior art, providing one kind based on optic fiber ring-shaped cavity
The coreless fiber hydrogen gas sensor swung, the hydrogen gas sensor have not by light source influence of fluctuations, fast response time, high sensitivity,
It is at low cost, it is safe and reliable the advantages that.
The technical solution that the utility model is taken in order to solve the technical problem are as follows:
A kind of coreless fiber hydrogen gas sensor based on fiber annular cavity-type BPM, including laser, modulator, signal occur
Device, transmission fiber, is coated with Pt/WO at 2 × 1 couplers3The coreless fiber sensing head of film, gas chamber, photodetector, data acquisition
Card and PC machine.
2 × 1 couplers include the first coupler and the second coupler.
The light input port of modulator is connected with laser, and the electric drive port of modulator and signal generator pass through cable
It is connected, the optical output port of modulator is connected with the low splitting ratio port of the first coupler two-port side, the first coupler
Single port one end is connected with one end of transmission fiber, and the other end of transmission fiber is connected with Single port one end of the second coupler,
The high splitting ratio port of second coupler two-port side be coated with Pt/WO in gas is indoor3The coreless fiber sensing head of film
One end be connected, be coated with Pt/WO3The other end of the coreless fiber sensing head of film and the high of the first coupler two-port side are divided
It is connected than port, the low splitting ratio port of the second coupler two-port side is connected with the input terminal of photodetector, and photoelectricity is visited
The output end for surveying device is connected by data collecting card with PC machine.
First coupler, the second coupler, is coated with Pt/WO at transmission fiber3The coreless fiber sensing head of film forms annular
Chamber.
It is described to be coated with Pt/WO3The coreless fiber sensing head of film is by coreless fiber, Pt/WO3Film is constituted, and coreless fiber length is
4.2cm, Pt/WO3Film with a thickness of 30nm-50nm.
With the variation of density of hydrogen, Pt/WO3Film is reacted with hydrogen generates variations in refractive index, so that in coreless fiber
Evanescent wave spot size changes, and the intensity in transmission of pulsed light changes correspondingly, and then influences the variation of ring-down time, passes through survey
Ring-down time variation is measured, the high-sensitivity measurement of density of hydrogen may be implemented.
The utility model has the following beneficial effects:
The utility model uses the sensing device based on fiber annular cavity-type BPM, and detection is ring-down time, can make to pass
Sense is influenced from light source fluctuation.
The utility model utilizes and is coated with Pt/WO3The coreless fiber of film is sensing head, and hydrogen acts on Pt/WO3Film makes it
Refractive index changes, and the intensity in transmission of pulsed light changes correspondingly, so influence ring-down time variation, by measurement decline swing when
Between change, the high-sensitivity measurement of density of hydrogen may be implemented.
The utility model utilizes Pt/WO3Film has good selectivity as coating material, to hydrogen, realizes highly sensitive
Density of hydrogen measurement.When plated film, one layer of WO is first sputtered in coreless fiber3Film, then Pt and WO3Common sputtering forms transition
Layer, finally by one layer of Pt film of d.c. sputtering.It can be improved the binding force of Pt film and coreless fiber by increasing intermediate layer,
Improve its recycling rate of waterused.
Detailed description of the invention
Fig. 1 is a kind of coreless fiber hydrogen gas sensor configuration schematic diagram based on fiber annular cavity-type BPM.
Specific embodiment
The utility model is further described with reference to the accompanying drawing.
As shown in Figure 1, a kind of coreless fiber hydrogen gas sensor based on fiber annular cavity-type BPM, including laser 1, modulation
Device 2, signal generator 3, the first coupler 4, transmission fiber 5, the second coupler 6 are coated with Pt/WO3The coreless fiber of film senses
First 7, gas chamber 8, photodetector 9, dataset acquisition card 10 and PC machine 11.The light input port of modulator 2 and 1 phase of laser
Even, the electric drive port of modulator 2 is connected with signal generator 3 by cable, and the optical output port of modulator 2 is coupled with first
The low splitting ratio port 402 of 4 two-port side of device is connected, Single port one end 401 of the first coupler 4 and the one of transmission fiber 5
End is connected, and the other end of transmission fiber 5 is connected with Single port one end 601 of the second coupler 6,6 two-port one of the second coupler
The high splitting ratio port 602 of side and it is coated with Pt/WO3One end of the coreless fiber sensing head 7 of film is connected, and is coated with Pt/WO3The nothing of film
Core fibre sensing head 7 is placed in gas chamber 8, and is coated with Pt/WO3The other end of the coreless fiber sensing head 7 of film and the first coupler 4
The high splitting ratio port 403 of two-port side is connected, the low splitting ratio port 603 of 6 two-port side of the second coupler and photoelectricity
The input terminal of detector 9 is connected, and the output end of photodetector 9 is connected by data collecting card 10 with PC machine 11.First coupling
Device 4, the second coupler 6, is coated with Pt/WO at transmission fiber 53The coreless fiber sensing head 7 of film forms annular chamber.By being coated with Pt/WO3
The coreless fiber 12 of film 13 is constituted in highly sensitive optical fiber hydrogen sensing head, and 12 length of coreless fiber is 4.2cm, Pt/WO3Film
13 with a thickness of 30nm-50nm.Photodetector 9, data collecting card 10 and PC machine 11 form signal demodulation part.
The working method of the utility model are as follows: the electric pulse that the light and signal generator 3 that laser 1 issues issue is by modulating
Device 2 is integrated into pulsed light, which inputs from the low splitting ratio port 402 of 4 two-port side of the first coupler, from the first coupling
Single port one end 401 of clutch 4 exports, and by Er-doped fiber 5, inputs from Single port one end 601 of the second coupler 6, big portion
Sectors is washed off to be exported from the high splitting ratio port 602 of 6 two-port side of the second coupler, by being coated with Pt/WO3The centreless light of film
Fine sensing head 7, then inputted from the high splitting ratio port 403 of 4 two-port side of the first coupler and form a circuit, often cover one
A circuit, will some pulsed light from the low splitting ratio port 603 of 6 two-port side of the second coupler export, by photoelectricity
After pulsed light is converted electric signal by detector 9, progress ring-down time detection in PC machine 11 is transferred to by data collecting card 10.
In annular chamber, with the variation of density of hydrogen, Pt/WO3Film 13 is reacted with hydrogen generates variations in refractive index, so that coreless fiber
Evanescent wave spot size in 12 changes, and the intensity in transmission of pulsed light changes correspondingly, and then influences the variation of ring-down time,
By establishing the relationship between ring-down time and density of hydrogen, the high-sensitivity measurement of density of hydrogen may be implemented.
The density of hydrogen that the device can be realized a kind of coreless fiber hydrogen gas sensor based on fiber annular cavity-type BPM is surveyed
The key technology of amount has:
1, fiber annular cavity-type BPM.It is to guarantee sensing not by light source wave using the sensing device based on fiber annular cavity-type BPM
The dynamic key influenced.In order to avoid the case where being overlapped or being distorted occurs in ring-down spectroscopy, pulsed light is around the one week time of annular chamber
The pulse period set by signal generator should be less than, and be greater than set pulsewidth.
2、Pt/WO3The thickness of film.Pt/WO3When the thickness of film is more than 50nm, it is whole excessively high just to will appear coreless fiber loss
The case where, when being lower than 30nm, there is serious deficiency, therefore, Pt/WO in the quality of film3The thickness of film should be controlled in 30nm-50nm
Between.
3、Pt/WO3The plated film mode of film.It can be improved Pd film and coreless fiber by increasing intermediate layer when plated film
Binding force improves its recycling rate of waterused.
In one concrete case of the utility model, the output wavelength of laser selects 1550nm；Signal generator output
The period of pulse is 125 μ s, pulsewidth 500ns；Transmission fiber is Standard single-mode fiber, length 1km；Coreless fiber passes
The coreless fiber diameter that uses of sense head is 125 μm, length 4.2cm；Pt/WO3Film with a thickness of 40nm.
The basic principles and main features that the utility model has been shown and described above are not departing from the spirit of the present invention
Under the premise of range, there are also various changes and modifications, these changes and improvements to both fall within claimed for the utility model
The range of utility model.
Claims (1)
1. a kind of coreless fiber hydrogen gas sensor based on fiber annular cavity-type BPM, it is characterised in that including laser, modulator,
Signal generator, transmission fiber, is coated with Pt/WO at 2 × 1 couplers3The coreless fiber sensing head of film, gas chamber, photodetector,
Data collecting card and PC machine；2 × 1 couplers include the first coupler and the second coupler；The light input port of modulator with
Laser is connected, and the electric drive port of modulator is connected with signal generator by cable, the optical output port of modulator and the
The low splitting ratio port of one coupler two-port side is connected, Single port one end of the first coupler and one end phase of transmission fiber
Even, the other end of transmission fiber is connected with Single port one end of the second coupler, the high light splitting of the second coupler two-port side
Than port be coated with Pt/WO in gas is indoor3One end of the coreless fiber sensing head of film is connected, and is coated with Pt/WO3The centreless of film
The other end of optical fiber sensor head is connected with the high splitting ratio port of the first coupler two-port side, the second coupler two-port one
The low splitting ratio port of side is connected with the input terminal of photodetector, and the output end of photodetector passes through data collecting card and PC
Machine is connected；First coupler, the second coupler, is coated with Pt/WO at transmission fiber3The coreless fiber sensing head of film forms annular chamber；
It is described to be coated with Pt/WO3The coreless fiber sensing head of film is by coreless fiber, Pt/WO3Film is constituted, and coreless fiber length is 4.2cm,
Pt/WO3Film with a thickness of 30nm-50nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920325959.0U CN209589854U (en) | 2019-03-15 | 2019-03-15 | A kind of coreless fiber hydrogen gas sensor based on fiber annular cavity-type BPM |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920325959.0U CN209589854U (en) | 2019-03-15 | 2019-03-15 | A kind of coreless fiber hydrogen gas sensor based on fiber annular cavity-type BPM |
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| CN209589854U true CN209589854U (en) | 2019-11-05 |
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| CN201920325959.0U Expired - Fee Related CN209589854U (en) | 2019-03-15 | 2019-03-15 | A kind of coreless fiber hydrogen gas sensor based on fiber annular cavity-type BPM |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113758902A (en) * | 2021-08-24 | 2021-12-07 | 比羿激光科技(湖州)有限公司 | Based on WO3Sagnac interference type optical fiber hydrogen sensor |
| CN113777097A (en) * | 2021-09-16 | 2021-12-10 | 山东第一医科大学(山东省医学科学院) | Chemical reaction monitoring device of high-precision optical lever based on optical signal |
-
2019
- 2019-03-15 CN CN201920325959.0U patent/CN209589854U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113758902A (en) * | 2021-08-24 | 2021-12-07 | 比羿激光科技(湖州)有限公司 | Based on WO3Sagnac interference type optical fiber hydrogen sensor |
| CN113777097A (en) * | 2021-09-16 | 2021-12-10 | 山东第一医科大学(山东省医学科学院) | Chemical reaction monitoring device of high-precision optical lever based on optical signal |
| CN113777097B (en) * | 2021-09-16 | 2023-04-25 | 山东第一医科大学(山东省医学科学院) | Chemical reaction monitoring device of high-precision optical lever based on optical signal |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191105 Termination date: 20200315 |