CN110567911A - Device for detecting oxygen concentration in inflammable gas and application thereof - Google Patents
Device for detecting oxygen concentration in inflammable gas and application thereof Download PDFInfo
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- CN110567911A CN110567911A CN201910939248.7A CN201910939248A CN110567911A CN 110567911 A CN110567911 A CN 110567911A CN 201910939248 A CN201910939248 A CN 201910939248A CN 110567911 A CN110567911 A CN 110567911A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/12—Circuits of general importance; Signal processing
- G01N2201/126—Microprocessor processing
Abstract
The invention relates to the technical field of gas concentration detection, and provides an oxygen concentration detection device and application thereof, wherein the oxygen concentration detection device comprises: the device comprises an optical module, a signal detection unit, a signal processing circuit and a singlechip control circuit; when the laser passes through oxygen, oxygen molecules absorb laser components in the wavelength range of 755-765nm in the laser, and part of the laser reflected by the surface of the object is irradiated back to the lens after being absorbed by the oxygen and is converged to the signal detection unit through the lens; the signal detection unit receives the converged laser signals and converts the laser signals into original electric signals; the signal processing circuit is electrically connected with the signal detection unit, receives and amplifies and filters the original electric signal to obtain a processed electric signal; and the singlechip control circuit performs differential processing on the processed electric signal to obtain an oxygen concentration signal to be detected. The invention can measure the oxygen concentration in the inflammable gas in the space, and has high stability and high measurement precision.
Description
Technical Field
the invention relates to the field of gas concentration detection, in particular to a device for detecting the concentration of oxygen in combustible gas and application thereof.
Background
many industries need to test the concentration of oxygen in air, and the current methods applied to oxygen measurement mainly include that an ultrasonic technology is used for measuring the proportion of oxygen in nitrogen-oxygen mixed gas, an oxygen sensor based on electrochemistry, oxide and semiconductor technologies, a tunable multimode laser diode laser or a tunable single-mode laser diode laser divides emitted laser beams into two beams, wherein one beam is directly collected by a photodiode, and the other beam is collected by the photodiode after being reflected for many times by a reflector and absorbed by oxygen.
at the present stage, the measurement target of the ultrasonic technology is the mixing ratio of oxygen in the nitrogen-oxygen mixed gas, and the concentration of oxygen in the combustible gas and the oxygen mixed gas cannot be measured. The tunable multimode laser diode laser or the tunable single-mode laser diode laser divides an emitted light beam into two beams, multiple reflection of a reflector is needed, the structure of a light path is complex, a light splitting device is easily influenced by external physical conditions, the long-term detection stability in a complex environment is poor, and the measurement mode is to measure the oxygen concentration of a single point in a space.
Disclosure of Invention
the invention mainly solves the technical problems that oxygen detection equipment in the prior art can only measure the oxygen concentration of a single point, has poor stability, low measurement precision and response speed in the operation process, cannot feed back the oxygen concentration in combustible gas in time and the like, and provides an open type detection device for the oxygen concentration in the combustible gas and application thereof.
The invention provides an oxygen concentration detection device, comprising: the device comprises an optical module (5), a signal detection unit (7), a signal processing circuit (12) and a singlechip control circuit (9);
The optical module (5) comprises: a lens (3), a signal detection unit (7) and a measuring light laser (4) arranged near the lens (3); the measuring light laser (4) is electrically connected with the singlechip control circuit (9);
The measuring light laser (4) emits laser, when the laser passes through oxygen, oxygen molecules absorb laser components in the wavelength range of 755nm-765nm in the laser, part of the laser reflected by the surface of the object is irradiated back to the lens (3) after being absorbed by the oxygen, and is converged to the signal detection unit (7) through the lens (3);
the signal detection unit (7) is arranged at the focus of the lens (3), and the signal detection unit (7) receives the laser signal converged by the lens (3) and converts the laser signal into an original electric signal;
The signal processing circuit (12) is electrically connected with the signal detection unit (7), and the signal processing circuit (12) receives and amplifies and filters the original electric signal to obtain a processed electric signal;
The single chip microcomputer control circuit (9) is electrically connected with the signal processing circuit (12), and the single chip microcomputer control circuit (9) performs differential processing on the processed electric signals to obtain an oxygen concentration signal in the combustible gas to be detected.
Preferably, the surface of the lens (3) is plated with a dielectric film with an anti-reflection or light-filtering function at 755nm-765 nm.
Preferably, the system further comprises a wireless transmission module or a wired transmission module;
The wireless transmission module or the wired transmission module is electrically connected with the singlechip control circuit (9).
preferably, the method further comprises the following steps: a housing (1), said housing (1) being in gaseous communication with a test area, an air chamber (8) being formed within said housing (1).
Preferably, a group of reflectors (6) are arranged in the shell (1) in a matching way;
the reflector (6) is arranged in the emitting direction of the measuring light laser (4) and reflects the laser to the lens (3).
Preferably, the optical module (5), the singlechip control circuit (9) and the signal processing circuit (12) are respectively arranged in the shell (1).
Preferably, the optical module (5) further comprises: an indicator light laser;
The indicating light laser is arranged near the measuring light laser (4) and used for indicating the position of a light beam emitted by the measuring light laser (4), and the indicating light laser is electrically connected with the single chip microcomputer control circuit (9).
Preferably, the method further comprises the following steps: a housing (1);
The optical module (5) is arranged at the front end of the shell (1), and the singlechip control circuit (9) and the signal processing circuit (12) are respectively arranged inside the shell (1).
Correspondingly, the invention also provides an application of the device for detecting the concentration of oxygen in the combustible gas in the crude oil storage tank and other fixed equipment terminals.
The detection device can measure the oxygen concentration in a certain range in a single-point or open space by combining a laser technology, has high stability, high measurement precision and high response speed, can detect the oxygen concentration in a specific area and an area where people are difficult to reach, does not need to consume oxygen reactants, and has the advantages of portability and maintenance-free property. The invention can realize the quantitative detection of the oxygen concentration between the device and the reflecting surface within the range of 0-50m in space. The invention can solve the problem of rapid detection of oxygen concentration in the crude oil storage tank and the flammable gas.
Drawings
fig. 1 is a schematic structural diagram of a device for detecting oxygen concentration in a combustible gas according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an optical module according to an embodiment of the present invention;
FIG. 3 is a schematic block diagram of an apparatus for detecting oxygen concentration in a combustible gas according to an embodiment of the present invention;
Fig. 4 is a schematic structural diagram of a device for detecting the concentration of oxygen in a combustible gas according to a second embodiment of the invention.
Reference numerals: 1. a housing; 2. a reflective surface; 3. a lens; 4. a measuring light laser; 5. an optical module; 6. a mirror; 7. a signal detection unit; 8. an air chamber; 9. a singlechip control circuit; 10. a laser beam; 11. oxygen gas; 12. a signal processing circuit.
Detailed Description
in order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings.
Example one
Fig. 1 is a schematic structural diagram of a device for detecting an oxygen concentration in a combustible gas according to an embodiment of the present invention. As shown in fig. 1, an apparatus for detecting an oxygen concentration in a combustible gas according to an embodiment of the present invention includes: the device comprises an optical module 5, a signal detection unit 7, a signal processing circuit 12 and a singlechip control circuit 9.
fig. 2 is a schematic structural diagram of an optical module 5 according to an embodiment of the present invention; fig. 3 is a schematic block diagram of an apparatus for detecting oxygen concentration in a combustible gas according to an embodiment of the present invention. As shown in fig. 2 and 3, the optical module 5 includes: a lens 3, a signal detection unit 7, a measuring light laser 4 disposed near the lens 3; the measuring light laser 4 is electrically connected with the singlechip control circuit 9; the measuring light laser 4 is controlled by the singlechip control circuit 9. The surface of the lens 3 is plated with a dielectric film which has the functions of anti-reflection or light filtering in the response wavelength range (755nm-765nm) of the signal detection unit 7 so as to achieve the functions of increasing the transmittance of the measuring light passing through the lens 3 and shielding non-measuring light of a non-specific light wave band (the specific light wave band refers to a certain range near a certain spectral line with absorption in the wavelength range of 755nm-765nm, the range is in the sub-range of 755nm-765nm, the non-specific light wave band refers to the range of 755nm-765nm, and the range is out of the certain range near the certain spectral line with absorption and the response range of the signal detection unit out of 755nm-765 nm).
The measuring light Laser 4 adopted in this embodiment adjusts the wavelength of Laser light emitted by the Laser semiconductor chip by modulating the driving current of the DFB (Distributed Feedback Laser) or VCSEL (Vertical Cavity Surface Emitting Laser) Laser semiconductor chip, couples the light beam emitted by the Laser semiconductor chip into a single-mode optical fiber, and then collimates the light beam by a collimator or directly collimates the light beam emitted by the Laser semiconductor chip, and the collimated Laser light beam can detect oxygen.
The oxygen concentration detection device in combustible gas of this embodiment belongs to single-point type oxygen concentration and measures, still includes: the shell 1 is communicated with a testing area through gas, the shell 1 can be communicated with the testing area through gas holes, openings and other forms, and a gas chamber 8 is formed in the shell 1. Meanwhile, a group of reflectors 6 are arranged in the shell 1 in a matching way; the mirror 6 is disposed in the emission direction of the measuring light laser 4, and emits laser light to the lens 3. The reflecting mirror 6 can fold the light path to achieve the purpose of increasing the light path. In addition, the optical module 5, the singlechip control circuit 9 and the signal processing circuit 12 are respectively arranged inside the shell 1.
the measuring light laser 4 emits laser, when the laser passes through oxygen, oxygen molecules absorb laser components in the wavelength range of 755nm-765nm in the laser, part of the laser reflected by the surface of the object is irradiated to the lens 3 after being absorbed by the oxygen, and the laser is converged to the signal detection unit 7 through the lens 3.
The signal detection unit 7 is arranged at the rear end of the lens 3, the signal detection unit 7 is coaxial with the lens 3, namely the signal detection unit 7 is arranged at the focus of the lens 3, and the signal detection unit 7 receives the laser signal converged by the lens 3 and converts the laser signal into an original electric signal; the signal detection unit 7 has good response characteristic and selective permeability in the optical signal with the wavelength of 755nm-765nm, and has good cut-off characteristic in the range of the rest wave bands.
The signal processing circuit 12 is electrically connected with the signal detection unit 7, and the signal processing circuit 12 receives and amplifies and filters the original electric signal to obtain a processed electric signal; the single chip microcomputer control circuit 9 is electrically connected with the signal processing circuit 12, and the single chip microcomputer control circuit 9 performs differential processing on the processed electric signals to obtain oxygen concentration signals to be detected. The single chip microcomputer control circuit 9 sends the oxygen concentration signal to the display circuit 10, and the display circuit 10 processes the oxygen concentration signal and displays the oxygen concentration signal through the display screen 2.
the device for detecting the concentration of oxygen in the flammable gas further comprises a wireless transmission module or a wired transmission module; the wireless transmission module or the wired transmission module is electrically connected with the singlechip control circuit 9. The power supply of the oxygen concentration detection device of the embodiment adopts a wired connection mode, and the output of the measurement data can be output to an external matching device in a wireless (Bluetooth and the like) or wired mode.
specifically, the single chip microcomputer control circuit 9 outputs a sawtooth wave (direct absorption method) or superposes a current signal of a sine wave (second harmonic method) on the basis of the sine wave, drives the measuring light laser to emit a measuring light laser beam with modulated wavelength, when the measuring light laser beam with modulated wavelength passes through oxygen, oxygen gas molecules selectively absorb a light beam with a specific wavelength (755nm-765nm), the signal detection unit 7 receives a laser signal with the wavelength being absorbed by oxygen molecules in a continuous modulation range, converts the detected laser signal absorbed by the gas molecules into an electric signal, and after the electric signal is amplified and filtered by the signal processing circuit 12, the single chip microcomputer control circuit 9 combines with a Lambert-Beer law, calculates a deviation value under ideal conditions when the gas molecules are absorbed and not absorbed by the gas molecules in a differential and differential calculation mode, and obtaining oxygen concentration information.
The invention utilizes TDLAS (Tunable Diode Laser Absorption Spectroscopy) technology, and combines the spectral Absorption peak of oxygen molecules in the 755nm-765nm range, when the Laser beam emitted by a measuring light Laser 4 passes through oxygen, the oxygen molecules have selective Absorption function to the light with specific wavelength (755nm-765nm), the Laser component with specific wavelength in the beam is absorbed and then irradiated to the surface of an object, part of the Laser reflected by the surface of the object is irradiated to a lens 3 after being absorbed by the oxygen, and then is converged to a signal detection unit 7 through the lens 3. The signal detection unit 7 receives an optical signal of the measuring optical laser when the wavelength changes continuously in the modulation range, converts the optical signal into an electric signal, combines the Lambert-Beer law, and outputs oxygen concentration information between the concentration detection device and the object surface within the range of 0-50m after circuit amplification and single chip processing.
The working principle of the device for detecting the concentration of oxygen in combustible gas in the embodiment is summarized as follows: singlechip control circuit 9 sends modulation signal drive measuring light laser 4 work, after measuring laser beam 10 is absorbed through oxygen and the reflection of speculum 6, partial reflected light shines to signal detection unit 7 through lens 3, signal detection unit 7 turns into the signal of telecommunication with the light signal of gathering, and with signal transmission to signal processing circuit 12 amplify and filter, signal transmission after the processing calculates to singlechip control circuit 9, output oxygen concentration information in the combustible gas, singlechip control circuit 9 conveys oxygen concentration data to wireless transmission module or wired transmission module, output to outside supporting device.
Example two
Fig. 4 is a schematic structural diagram of a device for detecting the concentration of oxygen in a combustible gas according to a second embodiment of the invention. As shown in fig. 4, a device for detecting oxygen concentration in a combustible gas according to a second embodiment of the present invention is similar to the first embodiment, and is different from the first embodiment in that:
Embodiment two belongs to the oxygen concentration measurement in open combustible gas, and the optical module 5 of embodiment two further includes: an indicator light laser; the indicating light laser is arranged near the measuring light laser 4 and used for indicating the position of a light beam emitted by the measuring light laser 4, and the indicating light laser 5 is electrically connected with the singlechip control circuit 9. The second embodiment also includes a housing 1; the optical module 5 is arranged at the front end of the shell 1, and the singlechip control circuit 9 and the signal processing circuit 12 are respectively arranged inside the shell 1. In the second embodiment, the reflecting surface 2 is arranged in the emitting direction of the measuring light laser 4, and the reflecting surface 2 can be an angular prism or a reflecting mirror. The measuring laser is reflected back to the lens 3 by the reflecting surface 2 (the pyramid prism is a three-dimensional reflecting structure, the incident light is parallel to the reflecting light direction, and the similar reflecting surface can be a right-angle reflecting surface or a plane reflecting surface).
The working principle of the device for detecting the concentration of oxygen in combustible gas in the embodiment is summarized as follows: the singlechip control circuit 9 sends a modulation signal to drive the measuring light laser 4 to work, and the indicating light emitted by the indicating light laser can measure the position of a light beam emitted by the light laser; after measuring laser beam 10 and absorbing and the plane of reflection 2 reflection through oxygen 11, partial reflection light assembles to signal detection unit 7 through lens 3, signal detection unit 7 converts the light signal who gathers into the signal of telecommunication to signal processing circuit 12 amplifies and filters with electrical signal transmission, signal transmission after the processing calculates to singlechip control circuit 9, output oxygen concentration information, singlechip control circuit 9 passes through wireless transmission module or wired transmission module with oxygen concentration data, output to outside supporting device.
EXAMPLE III
The device for detecting the concentration of oxygen in the flammable gas provided by any embodiment of the invention is applied to a crude oil storage tank and other fixed equipment terminals. The oxygen concentration detection device in the inflammable gas of this embodiment installs in the floating plate in the crude oil storage tank, measures the concentration of oxygen in the volatile crude oil gas in the oil tank and the oxygen gas mixture, links to each other with outside gas dilution equipment, guarantees inside oxygen concentration in safety range, avoids exploding. Meanwhile, the device for detecting the concentration of oxygen in the combustible gas can be arranged in other oxygen detection scenes; the invention is suitable for being used as equipment for detecting the concentration of oxygen in the combustible gas to detect the concentration of oxygen in the combustible gas.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: modifications of the technical solutions described in the embodiments or equivalent replacements of some or all technical features may be made without departing from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. an apparatus for detecting the concentration of oxygen in a combustible gas, comprising: the device comprises an optical module (5), a signal detection unit (7), a signal processing circuit (12) and a singlechip control circuit (9);
The optical module (5) comprises: a lens (3), a signal detection unit (7) and a measuring light laser (4) arranged near the lens (3); the measuring light laser (4) is electrically connected with the singlechip control circuit (9);
The measuring light laser (4) emits laser, when the laser passes through oxygen, oxygen molecules absorb laser components in the wavelength range of 755nm-765nm in the laser, part of the laser reflected by the surface of the object is irradiated back to the lens (3) after being absorbed by the oxygen, and is converged to the signal detection unit (7) through the lens (3);
the signal detection unit (7) is arranged at the focus of the lens (3), and the signal detection unit (7) receives the laser signal converged by the lens (3) and converts the laser signal into an original electric signal;
The signal processing circuit (12) is electrically connected with the signal detection unit (7), and the signal processing circuit (12) receives and amplifies and filters the original electric signal to obtain a processed electric signal;
The single chip microcomputer control circuit (9) is electrically connected with the signal processing circuit (12), and the single chip microcomputer control circuit (9) performs differential processing on the processed electric signals to obtain an oxygen concentration signal in the combustible gas to be detected.
2. the device for detecting the concentration of oxygen in flammable gas according to claim 1, wherein the surface of the lens (3) is coated with a dielectric film having an anti-reflection or light-filtering function at 755nm-765 nm.
3. The apparatus for detecting the concentration of oxygen in a combustible gas according to claim 1, further comprising a wireless transmission module or a wired transmission module;
the wireless transmission module or the wired transmission module is electrically connected with the singlechip control circuit (9).
4. the apparatus for detecting the concentration of oxygen in a combustible gas according to claim 1, further comprising: a housing (1), said housing (1) being in gaseous communication with a test area, an air chamber (8) being formed within said housing (1).
5. The apparatus for detecting the concentration of oxygen in a combustible gas according to claim 4, characterized in that a set of mirrors (6) is fitted inside said casing (1);
The reflector (6) is arranged in the emitting direction of the measuring light laser (4) and reflects the laser to the lens (3).
6. The device for detecting the concentration of oxygen in combustible gas according to claim 4 or 5, wherein the optical module (5), the singlechip control circuit (9) and the signal processing circuit (12) are respectively arranged inside the housing (1).
7. The device for detecting the concentration of oxygen in a combustible gas according to claim 1, characterized in that said optical module (5) further comprises: an indicator light laser;
The indicating light laser is arranged near the measuring light laser (4) and used for indicating the position of a light beam emitted by the measuring light laser (4), and the indicating light laser is electrically connected with the single chip microcomputer control circuit (9).
8. The apparatus for detecting the concentration of oxygen in a combustible gas according to claim 7, further comprising: a housing (1);
the optical module (5) is arranged at the front end of the shell (1), and the singlechip control circuit (9) and the signal processing circuit (12) are respectively arranged inside the shell (1).
9. Use of the apparatus for detecting the concentration of oxygen in a combustible gas according to any one of claims 1 to 8 in crude oil storage tanks and other stationary equipment terminals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910939248.7A CN110567911A (en) | 2019-09-30 | 2019-09-30 | Device for detecting oxygen concentration in inflammable gas and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910939248.7A CN110567911A (en) | 2019-09-30 | 2019-09-30 | Device for detecting oxygen concentration in inflammable gas and application thereof |
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| CN110567911A true CN110567911A (en) | 2019-12-13 |
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| CN201910939248.7A Pending CN110567911A (en) | 2019-09-30 | 2019-09-30 | Device for detecting oxygen concentration in inflammable gas and application thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111319884A (en) * | 2020-02-27 | 2020-06-23 | 大连艾科科技开发有限公司 | Method and device for preventing oil gas of crude oil storage tank from burning and exploding |
| CN113325070A (en) * | 2021-05-26 | 2021-08-31 | 深圳易如潜水装备有限公司 | Analysis device and method for component proportion of mixed gas used in diving |
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