CN203164116U - Multi-point volatile organic compound detecting device based on M-Z mode interference - Google Patents
Multi-point volatile organic compound detecting device based on M-Z mode interference Download PDFInfo
- Publication number
- CN203164116U CN203164116U CN 201320158399 CN201320158399U CN203164116U CN 203164116 U CN203164116 U CN 203164116U CN 201320158399 CN201320158399 CN 201320158399 CN 201320158399 U CN201320158399 U CN 201320158399U CN 203164116 U CN203164116 U CN 203164116U
- Authority
- CN
- China
- Prior art keywords
- volatile organic
- awg
- interferometer
- organic compound
- detecting device
- 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
Abstract
The utility model relates to a multi-point volatile organic compound detecting device based on the M-Z mode interface. The multi-point volatile organic compound detecting device is characterized by comprising a broadband light source, an AWG (any waveform generator), a plurality of M-Z interferometer sensing heads and a photoelectric detector array; the broadband light source is in optical connection with the input end of the AWG, each output end of the AWG is respectively connected with one end of the M-Z interferometer sensing head, and the other end of an interferometer is in optical connection with the photoelectric detector array; each M-Z sensing interferometer sensing head is formed by collapse welding two ends of one section of photo crystal optical fiber with two single-mode optical fibers, and a zeolite membrane which is sensitive to the volatile organic compound is coated in the collapsed area of the photo crystal optical fiber and an air hole; and the photoelectric detector array consists of arrays with the number being identical to that of the AWG channel number. The multi-point volatile organic compound detecting device has the advantages of compact structure, high sensitivity, intensity demodulation and capability of realizing online and multipoint multiplexing.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, is specifically related to a kind of multiple spot volatile organic matter pick-up unit of interfering based on the M-Z pattern.
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 series thing, organic chloride, freon series, organic ketone, alcohols, amine, ether and ester class etc. mainly comprised.VOCs has toxicity, pungency and carcinogenicity, can havoc environment and health.Therefore, development method sensitive, that fast, accurately measure VOCs content in the air is very important.
In conventional detection, because the distinct advantages of optical fiber, for example volume is little, and loss is low, and anti-electromagnetic interference (EMI) is suitable for remote detection etc., detects based on the volatile organic matter of optical fiber more and more to get more and more people's extensive concerning.Volatile organic matter detection method kind based on optical fiber is a lot, and the common method that has 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 the cost height, limited its range of application.Based on the volatile organic matter sensor of evanscent field type, there is the energy exchange of evanescent wave and volatile organic matter in the evanscent field zone, the total reflection light energy reduces, and just can calculate the concentration of volatile organic matter by the attenuation degree of measuring light intensity.But this sensor generally all needs to draw awl or corrosion technology, has reduced the physical characteristics of optical fiber.Volatile organic matter based on fiber grating detects also report to some extent, and gas to be measured acts on the fiber grating outside, by the fibre core that influences fiber grating, the drift that cladding-effective-index causes resonance wavelength.But the fiber grating of this sensor generally also can pass through corrosion treatment, can cause damage to optical fiber, and demodulation cost height.
At the problems referred to above, we have proposed a kind of multiple spot volatile organic matter pick-up unit of interfering based on the M-Z pattern.This sensor construction compactness, volatile organic matter highly sensitive, that can realize multipoint multiplexing are measured, and based on intensity demodulation, have greatly been reduced the cost of demodulated equipment.
Summary of the invention
The purpose of this utility model is exactly in order to solve the problem that the detection cost height, the sensitivity that exist in the existing volatile organic matter sensing technology are low, be difficult to realize online and multipoint multiplexing, has proposed a kind of compact conformation, highly sensitive, the multiple spot volatile organic matter pick-up unit of interfering based on the M-Z pattern that can realize online and multipoint multiplexing.
The utility model is that the technical scheme that the technical solution problem adopts is:
A kind of multiple spot volatile organic matter pick-up unit of interfering based on the M-Z pattern, comprise a wideband light source, wavelength-division array grating (Arrayed Waveguide Grating, AWG), a plurality of M-Z interferometer sensing head and a photodetector array; Wideband light source is connected with the input end light of AWG, and each output terminal of AWG is connected with an end light of M-Z interferometer sensing head respectively, and the other end of interferometer is connected with photodetector array light.
M-Z interferometer sensing head is to be made with the welding of caving in of two single-mode fibers respectively by the two ends of one section photonic crystal fiber, and applies last layer to the zeolite membrane of volatile organic matter sensitivity in photonic crystal fiber and the airport zone that caves in; Photodetector array is made up of the array identical with the AWG port number.
The beneficial effect that the utility model has is:
1. be divided into a plurality of light beams with the very narrow fixed single wavelength of live width behind the light process AWG that light source sends, can realize multimetering.
2. cave in the regional last layer that applies to the zeolite membrane of volatile matter sensitivity at photonic crystal fiber and airport, can realize the selective adsorption to volatile organic matter; The interference fringe that the M-Z pattern is interfered changes very responsive to phase place, and after the suction-operated of VOCs process zeolite membrane enters zeolite membrane, effect to the effective refractive index of photonic crystal fiber cladding mode is more direct, further increase and measure sensitivity, so the sensor of the utility model design has higher sensitivity.
3. in sense measuring device, introduce photoelectric detector, needn't re-use spectrometer observation wavelength and move demodulation and obtain volatile organic matter information, greatly reduced the cost of sensing equipment.
4. whole sense measuring device has compact conformation, and is highly sensitive, and alternative can realize advantages such as online and multipoint multiplexing, 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 detail view at the utility model sensing position.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
As shown in Figure 1, a kind of multiple spot volatile organic matter pick-up unit of interfering based on the M-Z pattern mainly comprises wideband light source 1, AWG2, M-Z interferometer sensing head 3, photodetector array 4.Wideband light source 1 is connected with the input end light of AWG2, and each output terminal of AWG2 is connected with an end light of M-Z interferometer sensing head 3 respectively, and the other end of interferometer 3 is connected with photodetector array 4 light.M-Z interferometer sensing head 3 is to be made with the welding of caving in of two single-mode fibers 6 respectively by the two ends of one section photonic crystal fiber 5, and applies last layer to the zeolite membrane of volatile organic matter sensitivity in photonic crystal fiber 5 and the airport zone that caves in; Photodetector array 4 is made up of the array identical with the AWG2 port number.
The working method of present embodiment is: the light that wideband light source sends is divided into a plurality of light beams with the very narrow fixed single wavelength of live width through AWG, each output terminal of AWG is connected with an end light of single-mode fiber in the interferometer respectively, and the other end of another root single-mode fiber is connected with photodetector array light.Whole sensing device is placed volatile organic matter environment to be detected, and light caves in through the weld airport behind the zone, and cladding mode is excited and transmits in photonic crystal fiber.When the selective adsorption effect of volatile organic matter by zeolite membrane enters film, can change the refractive index of zeolite membrane, and then change the effective refractive index of cladding mode.When core and cladding mode second airport cave in the zone in conjunction with after because there is phase differential in two-beam, can interfere, the output interference fringe, according to the coherent light interference principle, the interference peaks of interference fringe satisfies:
λ＝[n
co-n
cl(C)]L/k
N wherein
Cl(C) be the effective refractive index of photonic crystal fiber cladding mode, with volatile organic matter concentration C in the photonic crystal fiber covering funtcional relationship arranged, L is the length of photonic crystal fiber, and k is order of interference.In the air volatile organic content not simultaneously, the volatile organic content that enters zeolite membrane by the selective adsorption effect is also different, thus the refractive index of zeolite membrane changes, and then changes the effective refractive index of cladding mode, and interference spectrum is drifted about.The light intensity of the AWG passage that is connected with this interferometer sensing head also can change the output intensity by this device along with the move left and right generation linear change of interference spectum, therefore, can determine the concentration of volatile organic matter according to the size of output intensity.
The utility model can be realized the volatile organic matter sensing measurement and have higher sensitivity, can realize that the gordian technique that multipoint multiplexing detects is:
1. the light through AWG is divided into a plurality of light beams with the very narrow fixed single wavelength of live width, can realize multimetering.
2. cave in the regional last layer that applies to the zeolite membrane of volatile matter sensitivity at photonic crystal fiber and airport, because zeolite membrane has regular isotropic pore passage structure, can carry out selective adsorption to organic molecule, so can realize the selectivity of volatile organic matter is detected; The length of the photonic crystal fiber of selecting for use depends on the centre wavelength of the AWG passage that is connected with this interferometer, make the centre wavelength of this passage be positioned at the monotony interval of interference spectum.
3. in sense measuring device, introduce photoelectric detector, needn't re-use spectrometer observation wavelength and move demodulation and obtain volatile organic matter information, greatly reduced the cost of sensing equipment.
Wideband light source output wavelength in the present embodiment is 1500nm～1600nm, and AWG is made up of 16 passages with the very narrow fixed single wavelength of live width, and wavelength coverage is 1532nm-1545nm, and the wavelength interval is 0.8nm; Single-mode fiber is common SMF-28 single-mode fiber; The cladding diameter of photonic crystal fiber is 125 μ m, and core diameter is 7 μ m, and covering airport diameter is 3.06 μ m, and pitch of holes is 5.61 μ m, and length is 1～5cm; When the welding of caving in is photonic crystal light and single-mode fiber welding, by control electric current or discharge time, the airport in the photonic crystal fiber is caved in, the cave in length in zone of photonic crystal fiber two ends is～200 μ m and～204 μ m; Photoelectric detector is 4 * 4 arrays identical with the AWG port number.
Claims (1)
1. a multiple spot volatile organic matter pick-up unit of interfering based on the M-Z pattern is characterized in that, comprises a wideband light source, AWG, a plurality of M-Z interferometer sensing head and a photodetector array; Wideband light source is connected with the input end light of AWG, and each output terminal of AWG is connected with an end light of M-Z interferometer sensing head respectively, and the other end of interferometer is connected with photodetector array light; M-Z interferometer sensing head is to be made with the welding of caving in of two single-mode fibers respectively by the two ends of one section photonic crystal fiber, and applies last layer to the zeolite membrane of volatile organic matter sensitivity in photonic crystal fiber and the airport zone that caves in; Photodetector array is made up of the array identical with the AWG port number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320158399 CN203164116U (en) | 2013-04-01 | 2013-04-01 | Multi-point volatile organic compound detecting device based on M-Z mode interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320158399 CN203164116U (en) | 2013-04-01 | 2013-04-01 | Multi-point volatile organic compound detecting device based on M-Z mode interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203164116U true CN203164116U (en) | 2013-08-28 |
Family
ID=49025293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320158399 Expired - Fee Related CN203164116U (en) | 2013-04-01 | 2013-04-01 | Multi-point volatile organic compound detecting device based on M-Z mode interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203164116U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106537115A (en) * | 2014-02-14 | 2017-03-22 | 可口可乐公司 | System and method for continuous, real-time monitoring of chemical contaminants in carbon dioxide |
-
2013
- 2013-04-01 CN CN 201320158399 patent/CN203164116U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106537115A (en) * | 2014-02-14 | 2017-03-22 | 可口可乐公司 | System and method for continuous, real-time monitoring of chemical contaminants in carbon dioxide |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103439766B (en) | A kind of space division multiplexing method of multi-core fiber | |
| CN102226762B (en) | Volatile organic compound sensor based on HC-PBF band gap movement | |
| CN103616091B (en) | A kind of distributed fiber optic temperature and stress sensing device | |
| CN203605976U (en) | Distributed type optical fiber temperature and stress sensing device | |
| CN101592757A (en) | Cascade long-period fiber grating device and manufacture method thereof and humidity sensing system | |
| CN101793821A (en) | Sensing system used for monitoring multipoint gas concentration | |
| CN105277135A (en) | High sensitivity optical fiber curvature sensing construction having temperature insensitive characteristic | |
| CN102269573A (en) | Quasi-distributed composite structure strain and temperature detection system | |
| CN103528609A (en) | Combined interference type multi-parameter optical fiber sensor | |
| CN102607736B (en) | A kind of fiber grating combines the sensing arrangement of brillouin scattering signal detection | |
| CN102914516A (en) | Method and device for sensing volatile organic compound based on long-period grating of photonic crystal fiber | |
| CN110632033A (en) | F-P interference type multipoint measurement hydrogen sensor based on FBG demodulator | |
| CN1760641A (en) | Method and device for multiplexing and demodulating sensor based on optical fiber grating in long cycle | |
| CN103453940A (en) | Optical fiber sensor based on multi-mode structure | |
| CN102967584A (en) | Volatile organic matter sensing method and device based on photonic crystal fiber embedded interferometer | |
| CN203164116U (en) | Multi-point volatile organic compound detecting device based on M-Z mode interference | |
| CN102419312B (en) | Cascade optical waveguide sensor based on passive resonant cavity and grating demultiplexer | |
| CN207036297U (en) | A kind of optical fiber grating temperature-measuring system | |
| CN103439298A (en) | Chlorine ion concentration sensor and measurement system thereof | |
| CN210982221U (en) | FP interference type multipoint measurement hydrogen sensor based on FBG demodulator | |
| CN103196475A (en) | Hybrid fiber bragg grating sensing system for simultaneously measuring temperature, humidity and gas concentration | |
| CN204086135U (en) | A kind of volatile organic matter Fibre Optical Sensor of interfering based on fiber end face F-P | |
| CN111811554A (en) | Optical cavity ring-down-based large-range high-precision fiber grating sensing method and device | |
| CN103591970A (en) | Frequency division multiplexing device for double-grating optical fiber multi-longitudinal-mode straight cavity laser sensors | |
| CN203025081U (en) | Volatile organic compound sensor based on long-period optical grating of photonic crystal fiber |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130828 Termination date: 20160401 |