CN109975234A - A kind of miniaturization methylene oxide detecting instrument based on middle infrared LED absorption spectrum - Google Patents
A kind of miniaturization methylene oxide detecting instrument based on middle infrared LED absorption spectrum Download PDFInfo
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- CN109975234A CN109975234A CN201910307970.9A CN201910307970A CN109975234A CN 109975234 A CN109975234 A CN 109975234A CN 201910307970 A CN201910307970 A CN 201910307970A CN 109975234 A CN109975234 A CN 109975234A
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- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 235000019256 formaldehyde Nutrition 0.000 title claims abstract description 36
- 238000000862 absorption spectrum Methods 0.000 title claims abstract description 17
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 238000012545 processing Methods 0.000 claims abstract description 21
- 230000003287 optical effect Effects 0.000 claims abstract description 20
- 230000003321 amplification Effects 0.000 claims abstract description 15
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 15
- 238000001228 spectrum Methods 0.000 claims abstract description 8
- 230000008054 signal transmission Effects 0.000 claims abstract description 4
- 230000013011 mating Effects 0.000 claims 1
- 238000000295 emission spectrum Methods 0.000 abstract description 3
- 238000002329 infrared spectrum Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 26
- 238000010521 absorption reaction Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 235000013399 edible fruits Nutrition 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 241000218657 Picea Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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
- G01N21/17—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
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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
- G01N21/17—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
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
-
- 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
- G01N2021/3196—Correlating located peaks in spectrum with reference data, e.g. fingerprint data
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a kind of miniaturization methylene oxide detecting instruments based on middle infrared LED absorption spectrum, comprising: the spectrum of infrared band in LED light source transmitting, and it is divided into two-beam by light splitting piece, light beam is received by tested gas and the first optical filter by the first detector；Another light beam is received by reference gas chamber and the second optical filter by the second detector；First detector and the second detector are connected with locking phase amplification module, will receive the optical signal for being tested gas and after reference gas chamber absorbs and are converted to electric signal, and by electric signal transmission to locking phase amplification module；Locking phase amplification module is connected with signal processing mould, carries out signal demodulation based on the received electrical signal, and be sent to signal processing module；Signal processing module compares inverting by intensity based on the signal after demodulation and obtains measurement result.The present invention chooses the LED light source of middle infrared spectrum, and refers to emission spectrum as calculating by reference gas chamber in measurement, so that measurement result is more accurate.
Description
Technical field
The present invention relates to formaldehyde gas detection technique fields, more particularly to a kind of to be absorbed based on middle infrared LED
The miniaturization methylene oxide detecting instrument of spectrum.
Background technique
It is Chinese have every year it is thousands of newly spruce up, various building containing the harm of a large amount of formaldehyde gas fills
Exterior material, daily necessity also enter each family therewith, cause the serious pollution of room air.Therefore, for house Nei Jia
The measurement of aldehyde is very necessary.
Currently, the formaldehyde examination device of household is mainly based upon electrochemistry, the method for ultraviolet difference measures.It is wherein electric
The detection range of chemical method is limited, and because electric sensor generally uses the principle of redox reaction generation electric current,
Many gases are oxidized easily in measurement environment, cause measurement result inaccurate；And electrochemical method response speed is slow, analysis
Consuming time is long, is unable to real-time response；Electrochemical sensor is oxidized easily, therefore service life is short, is needed often with changing.And
The method of ultraviolet difference formaldehyde absorption intensity in the wavelength band is weak, causes measurement sensitivity low, it is unsuitable require it is high-precision
The indoor formaldehyde of degree detects.
Product based on both the above measurement method is by CCTV news report: " net is red " methylene oxide detecting instrument investigation: surveying
Data are not reliable, most valueless, amount to 41 batch samples of purchase, nearly 20 brands are all improper.
Therefore, how to provide a kind of accurate methylene oxide detecting instrument of measurement result is asking for those skilled in the art's urgent need to resolve
Topic.
Summary of the invention
In view of this, the present invention provides a kind of miniaturization methylene oxide detecting instrument based on middle infrared LED absorption spectrum, measurement
As a result more acurrate.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of miniaturization methylene oxide detecting instrument based on middle infrared LED absorption spectrum, comprising: LED light source, light splitting piece, reference
Gas chamber, the first optical filter, the second optical filter, the first detector, the second detector, locking phase amplification module and signal processing module；
The spectrum of infrared band in LED light source transmitting, and be divided into two-beam by the light splitting piece, wherein light beam
Successively after tested gas and first optical filter, received by first detector；Another light beam successively passes through described
After reference gas chamber and second optical filter, received by second detector；
First detector and second detector are connected with the locking phase amplification module, will receive through institute
It states the optical signal after tested gas and the reference gas chamber absorb and is respectively converted into electric signal, and by the electric signal transmission to institute
State locking phase amplification module；
The locking phase amplification module is connected with the signal processing mould, carries out signal demodulation based on the received electrical signal,
And it is sent to the signal processing module；
The signal processing module compares inverting by intensity based on the signal after demodulation and obtains measurement result.
Preferably, further includes: display module, the display module are connected with the signal processing module, survey for showing
Measure result.
Preferably, further includes: light source driver module, the light source driver module is connected with the LED light source, for exporting
Electric current required for the LED light source works and voltage signal.
Preferably, the LED light source emits 3.6 microns of spectrum.
Preferably, the reference gas chamber is provided with the formaldehyde gas of known concentration, the reference value as calculating.
It can be seen via above technical scheme that compared with prior art, the present disclosure provides one kind be based in it is infrared
The miniaturization methylene oxide detecting instrument of LED absorption spectrum, chooses the LED light source of middle infrared spectrum, most strong with formaldehyde in this wave band
Absorption line, in addition, emission spectrum is passed through reference gas chamber during measurement, reference gas chamber is provided with known concentration
Formaldehyde gas, as the reference value of calculating, so that finally obtained measurement result is more accurate.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the structural schematic diagram of the miniaturization methylene oxide detecting instrument provided by the invention based on middle infrared LED absorption spectrum
One；
Fig. 2 is the structural schematic diagram of the miniaturization methylene oxide detecting instrument provided by the invention based on middle infrared LED absorption spectrum
Two；
Fig. 3 is the structural schematic diagram of the miniaturization methylene oxide detecting instrument provided by the invention based on middle infrared LED absorption spectrum
Three；
Fig. 4 is the structural schematic diagram of the miniaturization methylene oxide detecting instrument provided by the invention based on middle infrared LED absorption spectrum
Four.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to attached drawing 1, the embodiment of the invention discloses a kind of miniaturization formaldehyde examinations based on middle infrared LED absorption spectrum
Instrument, comprising: LED light source, light splitting piece, reference gas chamber, the first optical filter, the second optical filter, the first detector, the second detector,
Locking phase amplification module and signal processing module；
The spectrum of infrared band in LED light source transmitting, and it is divided into two-beam by light splitting piece, wherein light beam successively passes through
After tested gas and the first optical filter, received by the first detector；Another light beam successively passes through reference gas chamber and the second optical filter
Afterwards, it is received by the second detector；
First detector and the second detector are connected with locking phase amplification module, and the warp received is tested gas and reference
Optical signal after gas chamber absorbs is respectively converted into electric signal, and by electric signal transmission to locking phase amplification module；
Locking phase amplification module is connected with signal processing mould, carries out signal demodulation based on the received electrical signal, and be sent to
Signal processing module；
Signal processing module compares inverting by intensity based on the signal after demodulation and obtains measurement result.
Light splitting piece is in behind light source, and LED light source is divided into two Shu Hangguang.Reference gas chamber is in after light splitting piece, the inside
Formaldehyde gas equipped with known concentration, the reference value as calculating.LED light source selects mid-infrared light source, and power is high, formaldehyde absorption
Intensity is high, so that detectivity is high.LED light source selects laser light source, and will alignment detector as far as possible, it is ensured that detector is all
Strongest absorption signal can be received.The effect of first optical filter and the second optical filter is the absorption of filtering non-formaldehyde gas,
Reduce background interference.Signal processing module extracts the modulation-demodulation signal obtained from different detectors, compares inverting by intensity
Obtain real-time gas concentration value.
Miniaturization methylene oxide detecting instrument provided by the invention based on middle infrared LED absorption spectrum, chooses middle infrared spectrum
LED light source, the interior strongest absorption line with formaldehyde of this wave band, in addition, by emission spectrum by joining during measurement
Gas chamber is examined, reference gas chamber is provided with the formaldehyde gas of known concentration, as the reference value of calculating, so that finally obtained measurement is tied
Fruit is more accurate.
In order to advanced optimize technical solution of the present invention, on the basis of the above embodiments, further includes: display module,
Display module is connected with signal processing module, and for showing measurement result, the embodiment new as one please specifically participate in attached drawing
2。
Display module connection signal processing module will measure binding fruit real-time display, and there are also operation interfaces, can adjust
Whole scan frequency and result refresh rate.In specific implementation, drive module and signal processing module can be arranged by software
To realize adjustment scan frequency and result refresh rate.
In order to advanced optimize technical solution of the present invention, on the basis of the above embodiments, further includes: light source drives mould
Block, light source driver module are connected with LED light source, for exporting electric current and voltage signal required for LED light source works, as new
Embodiment, for details, reference can be made to attached drawings 3 and 4, and its role is to ensure LED light source steady operation.
In order to further optimize the above technical scheme, LED light source emits 3.6 microns of spectrum.It is micro- that central wavelength is located at 3.6
Rice, covers 3.35~3.85 micron ranges by about 500 nanometers of spectral width, and underrange just covers the Absorption Line of formaldehyde gas.
Methylene oxide detecting instrument provided by the invention is easy to operate, it is small in size, be not required to that sampling, detection sensitivity is high, can remotely grasp
Make and measurement result is received by network, greatly simplifie entire measurement process and has ensured the reliability and stabilization of detection
Property.In specific implementation, can by wireless module, such as: the wireless technologys such as bluetooth remote operation and receive measurement result.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (5)
1. a kind of miniaturization methylene oxide detecting instrument based on middle infrared LED absorption spectrum characterized by comprising LED light source divides
Mating plate, reference gas chamber, the first optical filter, the second optical filter, the first detector, the second detector, locking phase amplification module and signal
Processing module；
The spectrum of infrared band in LED light source transmitting, and be divided into two-beam by the light splitting piece, wherein light beam is successively
After tested gas and first optical filter, received by first detector；Another light beam successively passes through the reference
After gas chamber and second optical filter, received by second detector；
First detector and second detector are connected with the locking phase amplification module, will receive through the quilt
It surveys the optical signal after gas and the reference gas chamber absorb and is respectively converted into electric signal, and by the electric signal transmission to the lock
Phase amplification module；
The locking phase amplification module is connected with the signal processing mould, carries out signal demodulation based on the received electrical signal, concurrently
Give the signal processing module；
The signal processing module compares inverting by intensity based on the signal after demodulation and obtains measurement result.
2. a kind of miniaturization methylene oxide detecting instrument based on middle infrared LED absorption spectrum according to claim 1, feature exist
In, further includes: display module, the display module is connected with the signal processing module, for showing measurement result.
3. a kind of miniaturization methylene oxide detecting instrument based on middle infrared LED absorption spectrum according to claim 1 or 2, special
Sign is, further includes: light source driver module, the light source driver module are connected with the LED light source, for exporting the LED
Electric current and voltage signal required for light source working.
4. a kind of miniaturization methylene oxide detecting instrument based on middle infrared LED absorption spectrum described in any one according to claim 1,
It is characterized in that, the LED light source emits 3.6 microns of spectrum.
5. a kind of miniaturization methylene oxide detecting instrument based on middle infrared LED absorption spectrum according to claim 3, feature exist
In the reference gas chamber is provided with the formaldehyde gas of known concentration, the reference value as calculating.
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| CN201910307970.9A CN109975234A (en) | 2019-04-17 | 2019-04-17 | A kind of miniaturization methylene oxide detecting instrument based on middle infrared LED absorption spectrum |
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| CN201910307970.9A CN109975234A (en) | 2019-04-17 | 2019-04-17 | A kind of miniaturization methylene oxide detecting instrument based on middle infrared LED absorption spectrum |
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Cited By (5)
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| CN111504925A (en) * | 2020-04-29 | 2020-08-07 | 安徽岩芯光电技术有限公司 | Gas detection device and method |
| CN112611726A (en) * | 2020-12-23 | 2021-04-06 | 陈政 | Molecular characteristic absorption spectrum measuring device and method |
| CN112763434A (en) * | 2019-10-21 | 2021-05-07 | 合肥新标智能设备有限公司 | Alcohol concentration measuring instrument |
| CN114112971A (en) * | 2021-11-23 | 2022-03-01 | 电子科技大学长三角研究院(湖州) | Infrared light detection method for rapidly detecting industrial emission formaldehyde |
| CN114965264A (en) * | 2021-12-30 | 2022-08-30 | 常熟市翼天航空技术有限公司 | Unmanned aerial vehicle sulfide pollution detection system and detection method thereof |
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Cited By (5)
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