CN202928946U - Volatile organic compound sensor based on high birefringence photonic crystal fiber environment - Google Patents
Volatile organic compound sensor based on high birefringence photonic crystal fiber environment Download PDFInfo
- Publication number
- CN202928946U CN202928946U CN 201220571185 CN201220571185U CN202928946U CN 202928946 U CN202928946 U CN 202928946U CN 201220571185 CN201220571185 CN 201220571185 CN 201220571185 U CN201220571185 U CN 201220571185U CN 202928946 U CN202928946 U CN 202928946U
- Authority
- CN
- China
- Prior art keywords
- crystal fiber
- volatile organic
- photon crystal
- air chamber
- photonic crystal
- 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 volatile organic compound sensor based on a high birefringence photonic crystal fiber environment. The two ends of a high birefringence photonic crystal fiber are aligned with two single mode fibers respectively; small intervals are formed between the two single mode fibers, so that the two single mode fibers are put into an air chamber (which is provided with an aligning system and a height-adjustable platform through a special design); the other ends of the two single mode fibers are guided out of the air chamber, and optically connected with two ports in one side of a 3dB coupler respectively to form an optical fiber environment; and the two ports in the other end of the 3 dB coupler are optically connected with a broadband light source and a spectrograph respectively. In order to solve the problems that an existing volatile organic compound sensing technology is complex to manufacture and high in cost and has difficulty in multiple measuring and micro detecting, the utility model provides the volatile organic compound sensor, which is compact in structure, capable of repeatedly measuring for a long time and high in flexibility, based on the high birefringence photonic crystal fiber environment.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, be specifically related to a kind of volatile organic matter sensor based on high double-refraction photon crystal fiber ring mirror (Highly Birefringent Photonic Crystal Fiber LoopMirror, HiBi-PCF-FLM).
Background technology
Volatile organic matter (volatile organic compounds, VOCs) be modal class air pollutants, be commonly referred to as boiling point at 50～250 ℃, the organism of steam be can form at normal temperatures and pressures, benzene homologues, organic chloride, freon series, organic ketone, alcohols, amine, ether and ester class etc. mainly comprised.VOCs has toxicity, pungency and carcinogenicity, can the havoc environmental and human health impacts.Therefore, development is sensitive, fast, the method for VOCs content is very important in the Accurate Determining air.
In existing detection method, due to the particular advantages of optical fiber, for example volume is little, and loss is low, is suitable for remote detection etc., detects based on the volatile organic matter of optical fiber more and more to be subject to people's attention.Simple, Practical Determination Method of VOCs kind based on optical fiber is a lot, and the modal method that is based on spectral analysis detects to analyze to the characteristic absorpting spectruming line of gas to be measured and obtains gas concentration to be measured.This detection method is highly sensitive, and response is fast, but the absorption spectra scope that often needs special light source to mate variety classes gas to be measured, so cost is high, has limited its range of application.Detect also report to some extent based on the volatile organic matter of fiber grating, gas to be measured acts on the fiber grating outside, by the fibre core that affects fiber grating, the drift that cladding-effective-index causes resonance wavelength.But the inscription meeting of grating causes damage to optical fiber, is difficult to long-term use.
For the problems referred to above, we have proposed a kind of volatile organic matter sensor based on high double-refraction photon crystal fiber ring mirror.This sensor construction is compact, and the trace monitoring is convenient in duplicate measurements for a long time, and is highly sensitive, has simultaneously the characteristic that the photonic crystal fiber resisting temperature is disturbed, and can well realize the detection of variety classes volatile organic matter.
Summary of the invention
The utility model purpose is exactly that the testing cost that exists in the existing volatile organic matter sensing technology of solution is high, be difficult to realize the problem of long-term duplicate measurements and trace detection, a kind of compact conformation, duplicate measurements for a long time, highly sensitive a kind of volatile organic matter sensor based on high double-refraction photon crystal fiber ring mirror are provided.
The utility model is that the technical scheme that the technical solution problem is taked is:
A kind of volatile organic matter sensor based on high double-refraction photon crystal fiber ring mirror comprises wideband light source, three-dB coupler, single-mode fiber, high double-refraction photon crystal fiber, air chamber, spectrometer.
The two ends of high double-refraction photon crystal fiber collimate with two single-mode fibers respectively, the small interval of middle reservation is placed in air chamber, and the other end of two single-mode fibers is drawn from air chamber, and be connected with two port opticals of three-dB coupler one side respectively, consist of a fiber loop mirror.Two ports of three-dB coupler opposite side are connected with spectrometer light with wideband light source respectively.
Air chamber is through particular design, with colimated light system and the platform that is used for fixing, adjusts the high double-refraction photon crystal fiber height.
Light is through the three-dB coupler effect, be divided into the two-beam of transmission dorsad, when two-beam transmits in high double-refraction photon crystal fiber in opposite directions, because two orthogonal polarization state refractive indexes of high double-refraction photon crystal fiber are different, through after whole fiber loop mirror, again arrive three-dB coupler and when exporting, because there is optical path difference in two-beam, can produce phase delay δ, so obvious interference fringe appears in emergent light on spectrometer.
δ＝2πBL/λ
Wherein: B is the refringence of two orthogonal polarization states of high double-refraction photon crystal fiber, and L is the length of high double-refraction photon crystal fiber, and λ is incident light centre wavelength.When the concentration of volatile organic matter in air chamber changes, be moved into also change thereupon of organic content in the high double-refraction photon crystal fiber airport through molecular diffusion, thereby cause the variation of B, interference fringe on spectrometer is subject to the phase place variable effect and can drifts about, and drift value is relevant to the concentration of extraneous volatile organic matter.So can realize by monitoring the sensing of volatile organic matter concentration with the drift value of one-level time interference fringe.
The beneficial effect that the utility model has is:
1 with high double-refraction photon crystal fiber as sensing unit, can form phase place is changed highstrung interference fringe, and phase place is relevant with the concentration of volatile organism in external environment, so the present invention has very high sensitivity.
2. high double-refraction photon crystal fiber comprises the large quantity of air hole, and the trace detection of volatile organic matter concentration is convenient to realize in micron dimension in the aperture.
3. high double-refraction photon crystal fiber has photonic crystal fiber to the insensitive characteristic of temperature variation, makes measuring process not be subjected to the impact of ambient temperature, has avoided temperature that measurement is impacted, and improves measuring accuracy.
4. whole sense measuring device has compact conformation, and the trace monitoring is convenient in duplicate measurements for a long time, and is highly sensitive, can well realize the detection of variety classes volatile organic matter.
Description of drawings
Fig. 1 is structural drawing of the present utility model;
Fig. 2 is the cross-sectional view of the high double-refraction photon crystal fiber that uses of the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
As shown in Figure 1, a kind of volatile organic matter sensor based on high double-refraction photon crystal fiber ring mirror comprises wideband light source 1, three-dB coupler 2, single-mode fiber 3, high double-refraction photon crystal fiber 4, air chamber 5, spectrometer 6.The two ends of high double-refraction photon crystal fiber 4 collimate with two single-mode fibers 3 respectively, the small interval of middle reservation is placed in air chamber 5, and the other end of two single-mode fibers 3 is drawn from air chamber 5, and be connected with two port opticals of three-dB coupler 2 one sides respectively, consist of a fiber loop mirror.Two ports of three-dB coupler 2 opposite sides are connected respectively light and are connected with spectrometer with wideband light source 1.
The working method of present embodiment is: the light that wideband light source sends is through the three-dB coupler effect, be divided into the two-beam of transmission dorsad, when two-beam transmits in high double-refraction photon crystal fiber in opposite directions, because two orthogonal polarization state refractive indexes of high double-refraction photon crystal fiber are different, through after whole fiber loop mirror, again arrive three-dB coupler and when exporting, can produce phase delay δ, therefore emergent light can interfere, and occurs obvious interference fringe on spectrometer.
δ＝2πBL/λ
Wherein: B is the refringence of two orthogonal polarization states of high double-refraction photon crystal fiber, and L is the length of high double-refraction photon crystal fiber, and λ is incident light centre wavelength.
When the concentration of volatile organic matter in air chamber changes, be moved into also change thereupon of organic content in the high double-refraction photon crystal fiber airport through molecular diffusion, thereby cause the variation of B, interference fringe on spectrometer is subject to the phase place variable effect and can drifts about, and drift value is relevant to the concentration of extraneous volatile organic matter.So can realize by monitoring the sensing of volatile organic matter concentration with the drift value of one-level time interference fringe, and precision is higher.
The high double-refraction photon crystal fiber that uses in this example, length L are 6.3cm, and the refringence B of airport refractive index n=1 o'clock two orthogonal polarization states is 8.95 * 10
-4, incident light central wavelength lambda=1550nm chooses harmonic peak centre wavelength and is the 1566.25nm place and is measurement point, when recording the methanol reagent of corresponding different volumes mark, and the inferior corresponding resonance wavelength of interference peaks of this level, its result such as table one.
The variation relation of methyl alcohol volume fraction and resonance wavelength in table one air
In air, in 5% scope, the resonance wavelength of choosing measurement point is changed to 1519nm from 1566.25nm to the volume fraction of methyl alcohol from 0% (being without methanol molecules airport), and variable quantity is about 47nm, and variation range is very large, is easy to read.As can be seen from the table, in air, the resonance wavelength of the content of methyl alcohol and selected interference peaks is approximate linear.Choose from 0% (being without methanol molecules airport) and observe to 1% scope, the volume fraction that is methyl alcohol in air changes 1%, the resonance wavelength drift value offset Δ λ ≈ 9nm of this grade time interference peaks, the resolution of spectrometer is 20pm, can get thus, the measuring accuracy of sensor described in the utility model is 2.2 * 10
-5, namely in air, the volume fraction of methyl alcohol changes when surpassing 0.0022%, all can be recorded by this sensor, illustrates that this sensor has very high sensitivity.
But the gordian technique that the utility model can be realized the volatile organic matter sensing measurement and have a higher sensitivity duplicate detection is:
1 with high double-refraction photon crystal fiber as sensing unit, can form phase place is changed highstrung interference fringe, and phase place is relevant with the concentration of volatile organism in external environment, so the present invention has very high sensitivity.
2. high double-refraction photon crystal fiber comprises the large quantity of air hole, and the trace detection of volatile organic matter concentration is convenient to realize in micron dimension in the aperture.
3. high double-refraction photon crystal fiber has photonic crystal fiber to the insensitive characteristic of temperature variation, makes measuring process not be subjected to the impact of ambient temperature, has avoided temperature that measurement is impacted, and improves measuring accuracy.
Single-mode fiber in the present embodiment is common SMF-28 single-mode fiber; High double-refraction photon crystal fiber length is 6.3cm, and refringence B is 8.95 * 10
-4Incident light central wavelength lambda=1550nm.
Claims (1)
1. volatile organic matter sensor based on high double-refraction photon crystal fiber ring mirror, comprise wideband light source (1), three-dB coupler (2), single-mode fiber (3), high double-refraction photon crystal fiber (4), air chamber (5), spectrometer (6), it is characterized in that: the two ends of high double-refraction photon crystal fiber (4) collimate with two single-mode fibers (3) respectively, the small interval of middle reservation, be placed in air chamber (5), the other end of two single-mode fibers (3) is drawn from air chamber (5), and be connected with two port opticals of three-dB coupler (2) one sides respectively, consist of a fiber loop mirror, two ports of three-dB coupler (2) opposite side are connected 6 with wideband light source (1) with spectrometer respectively) light is connected,
Described air chamber is through particular design, with colimated light system and the platform that is used for fixing, adjusts the high double-refraction photon crystal fiber height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220571185 CN202928946U (en) | 2012-10-26 | 2012-10-26 | Volatile organic compound sensor based on high birefringence photonic crystal fiber environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220571185 CN202928946U (en) | 2012-10-26 | 2012-10-26 | Volatile organic compound sensor based on high birefringence photonic crystal fiber environment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202928946U true CN202928946U (en) | 2013-05-08 |
Family
ID=48218897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220571185 Expired - Fee Related CN202928946U (en) | 2012-10-26 | 2012-10-26 | Volatile organic compound sensor based on high birefringence photonic crystal fiber environment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202928946U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103645145A (en) * | 2013-12-17 | 2014-03-19 | 中国计量学院 | Optical fiber hydrogen sensor |
| CN104048923A (en) * | 2014-06-16 | 2014-09-17 | 中国计量学院 | Method for measuring high-birefringence photonic crystal optical fiber volatile organic compounds based on liquefied film |
-
2012
- 2012-10-26 CN CN 201220571185 patent/CN202928946U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103645145A (en) * | 2013-12-17 | 2014-03-19 | 中国计量学院 | Optical fiber hydrogen sensor |
| CN104048923A (en) * | 2014-06-16 | 2014-09-17 | 中国计量学院 | Method for measuring high-birefringence photonic crystal optical fiber volatile organic compounds based on liquefied film |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhao et al. | Simultaneous measurement of RI and temperature based on the combination of Sagnac loop mirror and balloon-like interferometer | |
| Zhao et al. | Femtosecond laser-inscribed fiber-optic sensor for seawater salinity and temperature measurements | |
| CN102323239B (en) | Refractive index sensor based on asymmetric double-core optical fiber | |
| CN102226762B (en) | Volatile organic compound sensor based on HC-PBF band gap movement | |
| CN102944253B (en) | Based on fiber grating transverse pressure and the temperature simultaneously measuring system of polarimetry | |
| CN102914516A (en) | Method and device for sensing volatile organic compound based on long-period grating of photonic crystal fiber | |
| CN103528609A (en) | Combined interference type multi-parameter optical fiber sensor | |
| Zhang et al. | Constructed fiber-optic FPI-based multi-parameters sensor for simultaneous measurement of pressure and temperature, refractive index and temperature | |
| CN105093136A (en) | All-fiber weak magnetic field measuring device | |
| CN104316445A (en) | Optical fiber DNA molecule sensor based on inclined raster and manufacturing method and application thereof | |
| CN102889979A (en) | Polarization crosstalk estimation and symmetry estimation method of optical fiber ring | |
| CN102967584A (en) | Volatile organic matter sensing method and device based on photonic crystal fiber embedded interferometer | |
| Liu et al. | Review of fiber mechanical and thermal multi-parameter measurement technologies and instrumentation | |
| Cheng et al. | High-resolution polymer optical fibre humidity sensor utilizing single-passband microwave photonic filter | |
| CN111811554A (en) | Optical cavity ring-down-based large-range high-precision fiber grating sensing method and device | |
| CN202928946U (en) | Volatile organic compound sensor based on high birefringence photonic crystal fiber environment | |
| CN103453940A (en) | Optical fiber sensor based on multi-mode structure | |
| CN107340004A (en) | A kind of two-parameter detecting system for surpassing surface based on medium | |
| CN206772322U (en) | A kind of two-parameter detecting system for surpassing surface based on medium | |
| CN203025081U (en) | Volatile organic compound sensor based on long-period optical grating of photonic crystal fiber | |
| CN201034625Y (en) | Multiple parameter optical sensor | |
| CN204086135U (en) | A kind of volatile organic matter Fibre Optical Sensor of interfering based on fiber end face F-P | |
| CN201945404U (en) | Sensor based on three-degree inclined multimode fiber bragg grating (MFBG) for measuring temperature and refractive index simultaneously | |
| CN104048923A (en) | Method for measuring high-birefringence photonic crystal optical fiber volatile organic compounds based on liquefied film | |
| CN204630586U (en) | Based on the optical sensor of narrow-band light source and filtering characteristic adjustable element |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130508 Termination date: 20141026 |
|
| EXPY | Termination of patent right or utility model |