CN202793431U - Device for preparing low-loss micro-nano fiber grating sensor by chemical etching method - Google Patents
Device for preparing low-loss micro-nano fiber grating sensor by chemical etching method Download PDFInfo
- Publication number
- CN202793431U CN202793431U CN 201220192878 CN201220192878U CN202793431U CN 202793431 U CN202793431 U CN 202793431U CN 201220192878 CN201220192878 CN 201220192878 CN 201220192878 U CN201220192878 U CN 201220192878U CN 202793431 U CN202793431 U CN 202793431U
- Authority
- CN
- China
- Prior art keywords
- fiber
- bragg grating
- optical fiber
- spectrometer
- power meter
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model relates to a device for preparing a low-loss micro-nano fiber grating sensor by a chemical etching method, which comprises a broadband light source, a fiber circulator, a 3-dB fiber coupler, a spectrometer, an optical power meter, a stepping motor, a fiber written with Bragg grating, and a polytetrafluoroethylene container containing a corrosive solution. An optical signal of the broadband light source reaches the fiber Bragg grating via the fiber circulator while a reflection signal of the fiber Bragg grating is output to the 3-dB fiber coupler via the fiber circulator; the 3-dB fiber coupler transmits the reflection signal of the fiber Bragg grating to the spectrometer and the optical power meter; the tail end of the fiber written with Bragg grating is vertically dipped into the polytetrafluoroethylene container containing a corrosive solution, and the upper end of the same is fixed on the stepping motor; and the stepping motor increases the fiber speed and is controlled by a computer in real time. The device for preparing the low-loss micro-nano fiber grating sensor by the chemical etching method has the advantages including high precision, low cost, good anti-interference, simple and practical structure and suitable for mass production.
Description
Technical field
The utility model belongs to the photoelectric device technical field, relates to the device that a kind of chemical corrosion method prepares low-loss micro-nano fiber grating sensor.
Background technology
The diameter of micro-nano fiber has very strong evanscent field and higher optical power density in micron dimension, suitable with the communication band wavelength.The light field of micro-nano fiber transmission and sample on every side have very strong stimulative substance effect and long operating distance, thereby can realize highly sensitive optical sensing.But single micro-nano fiber sensor is based on extraneous sample variations in refractive index causes the transmission-type intensity modulation type sensor of surveying the light intensity variation, is subject to easily the impact of the factors such as light source stability.Fiber Bragg Grating FBG (Fiber Bragg grating, FBG) be in fiber core, to introduce periodic index modulation, can realize the measurement of the physical quantitys such as temperature, concentration, stress, pulling force, bending by the variation that detects Prague centre wavelength that extraneous output causes, be a kind of reflective wavelength-modulated sensor of practicality.The micro-nano fiber grating sensor that micro-nano fiber is combined with Fiber Bragg Grating FBG has the advantages such as anti-electromagnetic interference (EMI), volume are little, high sensitivity, high stability, is with a wide range of applications.
The method that chemical corrosion prepares the micro-nano fiber grating is to utilize the hydrofluorite corrosion in advance with the optical fiber of fiber grating, until the diameter of grating region reaches micron dimension.The method of chemical corrosion compare methods such as inscribing optical grating construction at micro-nano fiber have experimental facilities simple, be easy to regulate and be fit to the advantages such as production in enormous quantities.But can cause the rough of the asymmetric and refractive index sudden change of optical fiber gradation zone and optical fiber surface in the general corrosion process, thereby cause larger optical loss, seriously limit minimum diameter and the signal to noise ratio (S/N ratio) of corrosion preparation micro-nano fiber grating sensor.Therefore, by optical fiber gradation zone and optical fiber surface smoothness are optimized, it is very necessary obtaining low-loss micro-nano fiber grating sensor in corrosion process.
Find through retrieval, Chinese patent application number is: 201020256618.1, name is called: a kind of index sensor based on Fiber Bragg Grating FBG, this technology comprises a wideband light source, 3-dB fiber coupler, Fiber Bragg Grating FBG and spectrometer after corrosion, and wherein the Fiber Bragg Grating FBG after corrosion refers to be eroded by hydrofluorite the Fiber Bragg Grating FBG of covering.But this technical descriptioon the application power of micro-nano fiber grating at sensory field, but do not consider the larger optical loss problem that produces in the corrosion process.Learnt that by experiment this method can't obtain very thin micro-nano fiber grating, thereby limited the detection sensitivity of micro-nano fiber grating sensor; The relatively poor signal to noise ratio (S/N ratio) that larger loss of while causes also can have a strong impact on the actual detection of micro-nano fiber grating sensor and use.
Summary of the invention
The purpose of this utility model is to have proposed the device that a kind of chemical corrosion method prepares low-loss micro-nano fiber grating sensor for the deficiency of prior art existence.
The utility model is achieved through the following technical solutions:
The utility model comprises wideband light source, optical fiber circulator, 3-dB fiber coupler, spectrometer, light power meter, stepper motor, with the optical fiber of Bragg grating with fill the polytetrafluoroethylcontainer container of etchant solution.
The light signal of described wideband light source arrives Fiber Bragg Grating FBG by optical fiber circulator, and the reflected signal of Fiber Bragg Grating FBG outputs to the 3-dB fiber coupler by optical fiber circulator simultaneously.
Described 3-dB fiber coupler is transferred to spectrometer and light power meter with the reflected signal of Fiber Bragg Grating FBG.
The drift of Prague centre wavelength of causing because surrounding layer and part fibre core are corroded in the spectrometer Real-Time Monitoring Fiber Bragg Grating FBG corrosion process.
The light intensity of reflected signal changes in the light power meter Real-Time Monitoring Fiber Bragg Grating FBG corrosion process.
The end of described optical fiber with Bragg grating vertically is immersed in the polytetrafluoroethylcontainer container that fills hydrofluoric acid solution.
The upper end of described optical fiber with Bragg grating vertically is fixed on the stepper motor.Stepper motor promotes the speed of optical fiber by real time computer control.
Compare with existing technology by corrosion preparation micro-nano fiber grating, the stepper motor in the utility model can accurately be controlled the optical fiber pulling speed that is immersed in the etchant solution.By promote slowly optical fiber can realize the optical fiber gradation zone mild be transitioned into the micro-nano fiber part, thereby reduce the variations in refractive index gradient of optical fiber gradation zone; Utilize simultaneously the drift of Prague centre wavelength of spectrometer detection can determine the critical conditions that surrounding layer has been corroded, this moment, suitable increase pulling speed can be eliminated because the corrosion interface sudden change that surrounding layer and fibre core component difference cause further reduces optical loss.Because optical fiber vertically is immersed in the etchant solution, and by vertical-lift, so can reduce the optical loss of the asymmetric generation of micro-nano fiber that the shake of optical fiber causes in the corrosion process simultaneously.The utility model device is simple, repeatable high, can realize preparing in batches the micro-nano fiber grating by the simple optical fiber of monitoring in the many samples, and is significant based on the development of micro-nano fiber grating device to promoting.
The utlity model has the high and low cost of precision, anti-interference good, simple and practical, be suitable for the advantages such as production in enormous quantities.
Description of drawings
Fig. 1 is structural representation of the present utility model:
Wherein: 1-wideband light source, 2-optical fiber circulator, 3-3-dB fiber coupler, 4-spectrometer, 5-light power meter, 6-are with optical fiber, 7-polytetrafluoroethylcontainer container, the 8-stepper motor of Bragg grating.
Wavelength is two FBG its loss comparison diagram when having or not accurate lifting control corrosion of 1547.65nm and 1547.89nm centered by Fig. 2:
Wherein: 1-centre wavelength is the reflectance spectrum of FBG when Prague centre wavelength drift 16.8nm of 1547.65nm, the reflectance spectrum of FBG when Prague centre wavelength drift 16.8nm that 2-centre wavelength is 1547.89nm.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described: present embodiment is implemented under take technical solutions of the utility model as prerequisite; provided detailed embodiment and concrete operating process, but protection domain of the present utility model is not limited to following embodiment.
Embodiment
As shown in Figure 1, this device comprises a wideband light source 1, a spectrometer 4, a light power meter 5, a stepper motor 8 and the optical fiber 6 with Bragg grating, wherein the light that sends of wideband light source 1 is transferred to optical fiber 6 with Bragg grating through optical fiber circulator 2, reflected signal with the optical fiber 6 of Bragg grating is transferred to 3-dB fiber coupler 3 through optical fiber circulator 2, the light signal that is transferred to 3-dB fiber coupler 3 is transferred to respectively spectrometer 4 and light power meter 5, end with the optical fiber 6 of Bragg grating is vertically placed in the polytetrafluoroethylcontainer container 7, upper end with the optical fiber 6 of Bragg grating vertically is fixed on the stepper motor 8, optical fiber 6 with Bragg grating is to carry the general single mode fiber that hydrogen was processed, grating length is 1cm, is positioned at the end of optical fiber.
What the stepper motor 8 in the present embodiment adopted is the automatically controlled tilting table of the MGC101 of Beijing Century Instr Ltd. Series Precision and SC controllor for step-by-step motor.
The course of work of present embodiment: with the alcohol swab wiping optical fiber 6 with Bragg grating, will be vertically placed in the polytetrafluoroethylcontainer container 7 with the end of the optical fiber 6 of Bragg grating afterwards, its upper end vertically is fixed on the stepper motor 8; Adding concentration is 26% hydrofluorite etchant solution in polytetrafluoroethylcontainer container 7; Start stepper motor 8, with speed V
1Lifting is with the optical fiber 6 of Bragg grating, and Real-Time Monitoring spectrometer 4 and light power meter 5.
When reducing, the light intensity of light power meter 5 demonstrations increases pulling speed to V
2, and with V
2At the uniform velocity promote the optical fiber 6 that Bragg grating is arranged; V wherein
2=1.33V
1Continue corrosion optical fiber, the drift value of Prague centre wavelength that shows by spectrometer 4 determines whether stop corrosion.As shown in Figure 2, same set of grating inscribe platform the centre wavelength that the standard single-mode fiber that carries hydrogen is inscribed be two FBG of 1547.65nm and 1547.89nm when having or not respectively under the accurate lifting control corrosion its centre wavelength drift about to shortwave, and loss increases gradually; Under centre wavelength is all drifted about the situation of 16.8nm, apply the micro-nano fiber grating that promotes the control preparation and compare and do not apply the optical loss that can reduce 6.29dB when promoting control.The contrast fibre diameter changes the analog result of the Bragg grating centre wavelength drift that causes, micro-nano fiber grating diameter corresponding to centre wavelength 16.8nm drift is 4um.Mention fast immediately the optical fiber 6 with Bragg grating from etchant solution, etch-stop also dries up with the etchant solution of soft stream of nitrogen gas with optical fiber surface along the optical fiber direction.Etchant solution in the polytetrafluoroethylcontainer container 7 is changed to deionized water solution, the micro-nano fiber after the corrosion is slowly put into solution do again further operation.
In the present embodiment solution example of different refractivity is placed on the sensor that utilizes the present embodiment made in the polytetrafluoroethylcontainer container 7 and can realizes refractometry.
Claims (1)
1. chemical corrosion method prepares the device of low-loss micro-nano fiber grating sensor, comprise wideband light source, optical fiber circulator, 3-dB fiber coupler, spectrometer, light power meter, stepper motor, with the optical fiber of Bragg grating with fill the polytetrafluoroethylcontainer container of etchant solution, it is characterized in that:
The light signal of wideband light source arrives Fiber Bragg Grating FBG by optical fiber circulator, and the reflected signal of Fiber Bragg Grating FBG outputs to the 3-dB fiber coupler by optical fiber circulator simultaneously;
The 3-dB fiber coupler is transferred to spectrometer and light power meter with the reflected signal of Fiber Bragg Grating FBG;
The drift of Prague centre wavelength of causing because surrounding layer and part fibre core are corroded in the spectrometer Real-Time Monitoring Fiber Bragg Grating FBG corrosion process;
The light intensity of reflected signal changes in the light power meter Real-Time Monitoring Fiber Bragg Grating FBG corrosion process;
End with the optical fiber of Bragg grating vertically is immersed in the polytetrafluoroethylcontainer container that fills hydrofluoric acid solution;
Upper end with the optical fiber of Bragg grating vertically is fixed on the stepper motor; Stepper motor promotes the speed of optical fiber by real time computer control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220192878 CN202793431U (en) | 2012-05-03 | 2012-05-03 | Device for preparing low-loss micro-nano fiber grating sensor by chemical etching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220192878 CN202793431U (en) | 2012-05-03 | 2012-05-03 | Device for preparing low-loss micro-nano fiber grating sensor by chemical etching method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202793431U true CN202793431U (en) | 2013-03-13 |
Family
ID=47820677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220192878 Expired - Fee Related CN202793431U (en) | 2012-05-03 | 2012-05-03 | Device for preparing low-loss micro-nano fiber grating sensor by chemical etching method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202793431U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102645237A (en) * | 2012-05-03 | 2012-08-22 | 浙江大学 | Method and device for manufacturing low-loss micro-nanometer fiber bragg grating sensor in chemical corrosion method |
| CN109596570A (en) * | 2018-10-24 | 2019-04-09 | 昆明理工大学 | A kind of biochemical sensitive system based on Si-based photodetectors |
-
2012
- 2012-05-03 CN CN 201220192878 patent/CN202793431U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102645237A (en) * | 2012-05-03 | 2012-08-22 | 浙江大学 | Method and device for manufacturing low-loss micro-nanometer fiber bragg grating sensor in chemical corrosion method |
| CN109596570A (en) * | 2018-10-24 | 2019-04-09 | 昆明理工大学 | A kind of biochemical sensitive system based on Si-based photodetectors |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102519499B (en) | Based on the quasi-distributed sensor of micro-structure fiber optic Fabry-Perot cavity quasi | |
| CN101718571B (en) | Tilt fiber bragg grating (TFBG) liquid level change measuring instrument | |
| CN109855760B (en) | Echo wall mode resonant cavity temperature sensor and preparation method thereof | |
| CN109974758B (en) | Optical fiber sensor for simultaneously measuring three parameters of sea water temperature, salt depth and preparation method thereof | |
| CN100529735C (en) | Temperature and solidification rate real-time monitoring device for polymer based composite material forming process | |
| CN107677390B (en) | Preparation method of fused-cone type optical fiber Mach-Zehnder sensor | |
| CN102645237A (en) | Method and device for manufacturing low-loss micro-nanometer fiber bragg grating sensor in chemical corrosion method | |
| CN208091588U (en) | Micro-nano long period fiber-optical grating temperature sensor based on glass capillary encapsulation | |
| Wang et al. | Overview of fibre optic sensing technology in the field of physical ocean observation | |
| CN103852428A (en) | Humidity sensor based on multimode fiber core and fiber grating and preparation method of humidity sensor | |
| CN111398222A (en) | Optical fiber refractive index sensor based on Mach-Zehnder interferometry | |
| CN106442340A (en) | Device and method for detecting seawater salinity based on long period fiber grating | |
| CN202793431U (en) | Device for preparing low-loss micro-nano fiber grating sensor by chemical etching method | |
| Shuo et al. | A miniature SMS-LPG bending sensor with high sensitivity based on multimode fiber embedded-LPG | |
| Zhao et al. | Ultra-Short Fiber Bragg Grating Composed of Cascaded Microchannels in a Microprobe for Refractive Index Measurement | |
| CN114137273B (en) | Temperature-sensitive current eliminating sensing device of FBG cascade optical fiber composite structure | |
| Liu et al. | Dual-detection-parameter SPR sensor based on graded index multimode fiber | |
| Jiang et al. | Precise measurement of liquid-level by fiber loop ring-down technique incorporating an etched fiber | |
| CN103592064B (en) | A kind of optical-fiber Fabry-Perot force sensor and preparation method thereof | |
| CN114137446B (en) | Temperature-sensitive magnetic field eliminating sensing device of FBG cascade optical fiber composite structure | |
| CN102706825B (en) | Method and system for measuring concentration of chemical solution by fiber bragg gratings (FBG) | |
| CN211825681U (en) | Hydrogen sensor based on FBG is write in flat single mode fiber of toper | |
| CN111141415A (en) | Long-period grating temperature probe with thermosensitive liquid filled in optical fiber groove | |
| CN110006846B (en) | Trace liquid refractive index measuring device of V-shaped special optical fiber and preparation method | |
| CN202661374U (en) | System for using fiber bragg grating to measure chemical solution concentration |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20140503 |