CN2886556Y - Infrared online gas analyzer - Google Patents
Infrared online gas analyzer Download PDFInfo
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- CN2886556Y CN2886556Y CN 200520115662 CN200520115662U CN2886556Y CN 2886556 Y CN2886556 Y CN 2886556Y CN 200520115662 CN200520115662 CN 200520115662 CN 200520115662 U CN200520115662 U CN 200520115662U CN 2886556 Y CN2886556 Y CN 2886556Y
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- light
- infrared
- gas analyzer
- photoelectric sensor
- signal
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Abstract
The utility model relates to an infrared gas analyzer comprising a light path part and a circuit part, wherein the light path part comprises an infrared light source, a parabolic reflector, a light pipe, a spherical reflector, a focusing lens and an optical platform, the optical platform includes three right-angle light splitters, three narrowband light filters, two air chambers, four hypo-focusing lens, a plane reflector and four infrared detectors; the circuit part is provided with a power, a photoelectric sensor, an amplifying part, a filtering part, and a signal transform part. According to the absorption property of different air, single light beam, single wavelength chamber method and single light beam, and dual wavelength filtering methods are separately adopted. The unique and reliable light path design uses fewer optical elements, and no movable optic elements are adopted, thereby the stability and repeatable precision while measuring are guaranteed, the affect of zero drift on measuring is eliminated.
Description
Technical field
The utility model relates to infrared ray gas analysis equipment, relates in particular to a kind of CO of on-line measurement simultaneously that is applied to flue gas, industrial flue, NO, NO
2, SO
2, H
2O, HF, HCL, CO
2In one or more the infrared gas analysis device in the multicomponent gas.
Background technology
At present, the gas analyzer of international and domestic application mainly adopts galvanochemistry and two kinds of analytical technologies of optics.Anode electrochemistry analysis instrument properties of product instability, consistance is poor.For accurate measurement, all need to demarcate again before measuring each time, in use maintenance is bigger, and job costs are than higher.And the electrochemical analyser mission life is limited, can not long-term work in industry spot.The gas analyzer of optics mainly is the sampling type device.The sampling type gas analyzer needs sampling thief, sample lines and analyser main control unit, and cost is than higher.The effect of sampling thief is that dust is filtered, so stop up easily in long-term operational process, often needs to change, and has increased application cost.For SO
2The water-soluble gasmetry error of this class is very big, can't measure substantially for the gas that this class of HCL is very easily water-soluble, can't measure especially for the concentration of water vapor.The water-soluble formation acid of sour gas is very big to the sampling conduit corrosion.And the response speed of sampling type system is very slow, is unfavorable for the real-time control in the industry spot.
The utility model proposes for addressing the above problem.
The utility model content
The purpose of this utility model provides the online gas analyzer of a kind of novel infrared ray, adopt infrared ray optical filtering technique, infrared gas absorption techniques, photoelectric conversion technique and electronic signal process technology, the CO of industrial sector industrial flues such as the measurement electric power of online in real time, environmental protection, oil, chemical industry, metallurgy, waste incineration or discharging, NO, NO
2, SO
2, H
2O, HF, HCL, CO
2Deng one or more gases in the multicomponent gas.
The online gas analyzer of the infrared ray that the utility model provides comprises light path part and circuit part; Wherein light path part comprises infrared light supply, parabolic mirror, light pipe, spherical reflector, condenser lens and optical table part; Optical table comprises three right angle spectroscopes, three narrow band pass filters, two air chambers, four condenser lenses, plane mirror and four infrared eyes; The infrared light that infrared light supply sends enters into light path system through described parabolic mirror, got back to optical table after the spheric reflection mirror reflection line focus lens focus, be divided into four bundle light later on by twice beam split of two spectroscopes then, photoelectric sensor is arrived in processing through optical filter, inferior condenser lens, finishes by the transformation of light signal to electric signal; Circuit part is grouped into by power supply, photoelectric sensor, amplifier section, filtering part, signal conversion part; Light signal is transformed into the correspondent voltage signal via photoelectric sensor, through amplifier section voltage signal is amplified then, through the filtering part clutter in the signal is filtered, and converts voltage signal to industry standard signal by the conversion of signals part at last.
Preferably, also comprise probe segment in light path part, the sintered stainless steel that described probe segment employing hole is 2 μ is provided with heating tape as outer wall between probe core and outer wall.
Preferably, optical table comprises single beam, single wavelength air chamber optical table and single beam, dual wavelength optical filter optical table two parts.Single beam, single wavelength air chamber optical table comprise air chamber, inferior condenser lens and infrared photoelectric sensor; Single beam, dual wavelength optical filter optical table comprise narrow band pass filter, inferior condenser lens and infrared photoelectric sensor.
Adopted the infrared ray optical filtering technique in the utility model, the infrared gas absorption techniques, photoelectric conversion technique, up-to-date modern high technology technology such as electronic signal process technology can be widely used in industrial sectors such as electric power, environmental protection, oil, chemical industry, metallurgy, waste incineration.Its characteristics are as follows:
1, light path design uniqueness makes signal stronger, and anti-veiling glare interference performance is stronger.Do not have removable optics, measure more reliably, improved the stability and the repeatable accuracy at zero point;
2, the infrared probe formula structure of Cai Yonging has been eliminated the influence of high dust concentration to measuring;
3, on-line real time monitoring, the response time is less than 5ms;
4, at different gas characteristics, adopt different analytical approachs, CO, NO, the gas that is easily disturbed by the absorption spectrum of other gas that HCL is such adopts single beam, the air chamber method of single wavelength.The measurement gas disturbed by other gas absorption spectra of being not easy for other adopts single beam, the optical filter method of dual wavelength.Eliminated the influence of other interference gas such as water vapor;
5, measuring accuracy height can reach 5ppm;
6, no sampling system, maintenance is low;
The needs that 7, can adapt to industry spot can move in continuous 24 hours.
Description of drawings
Fig. 1 is the system architecture synoptic diagram of the online gas analyzer of the utility model infrared ray.
Among the figure: 1: infrared light supply; 2: parabolic mirror; 3: light pipe; 4: spherical reflector; 5: condenser lens; 6: the right angle spectroscope; 7: narrow band pass filter; 8: the right angle spectroscope; 9: air chamber; 10: inferior condenser lens; 11: infrared photoelectric sensor; 12: infrared photoelectric sensor; 13: inferior condenser lens; 14: air chamber; 15: plane mirror; 16: spectroscope; 17: narrow band pass filter; 18: inferior condenser lens; 19: infrared photoelectric sensor; 20: narrow band pass filter; 21: inferior condenser lens; 22: infrared photoelectric sensor.
Embodiment
Following examples are used to illustrate the utility model, but are not used for limiting scope of the present utility model.
The utility model adopts infrared ray optical filtering technique, infrared gas absorption techniques, photoelectric conversion technique and electronic signal process technology, the CO of industrial sector industrial flues such as measurement electric power that can online in real time, environmental protection, oil, chemical industry, metallurgy, waste incineration or discharging, NO, NO2, SO2, H2O, HF, HCL, one or both gases in the multicomponent gases such as CO2.
The utility model adopts non-ly to be dispersed infrared test philosophy and realizes.According to Lang Baite-Bill's infrared spectrum absorption law (Beer-Lambert Law), following formula is observed in the absorption of gas:
A
x＝log(I
0/I)＝a·b·c
Wherein:
Ax: gas at wavelength x place by ultrared uptake;
IO: the light intensity of infrared light before being absorbed;
I: the light intensity of infrared light after being absorbed;
A: the absorption coefficient of this kind gas;
B: light path, promptly absorbed optical path length;
C: sample gas concentration.
By above formula, just can obtain the concentration of tested gas by the method for demarcating.
This infrared ray in-line analyzer structurally adopts the sonde-type structure.Owing to be the measuring method that adopts single beam, and do not have moving-member, so we have installed two groups of optical filters on optical table.Correspond respectively to two kinds of measured gases, if only measure a kind of gas, it is just passable that one group of optical filter is installed.
For CO, NO, the gas that is easily disturbed that HCL is such by the absorption spectrum of other gas, adopt single beam, the air chamber method of single wavelength is promptly only installed the narrow band pass filter of a slice corresponding to tested gas absorption on the optical table, the optical splitter that an an angle of 90 degrees is arranged later at narrow band pass filter, infrared light is divided into two vertical bundles, the air chamber of a sky has been installed in a branch of infrared light, in another bundle infrared light, an air chamber that is full of the tested gas of 99.9% above concentration has been installed.Just eliminated the interference of the absorption spectrum of other interference gas in this way.The measurement gas disturbed by other gas absorption spectra of being not easy for other adopts single beam, the optical filter method of dual wavelength.Two different narrow band pass filters promptly are installed on optical table.One tablet filter is the narrow band pass filter corresponding to measured gas absorption, as measuring optical filter.Another tablet filter is selected as far as possible the narrow band pass filter without any the wavelength of gas absorption near the absorbing wavelength of tested gas, as the reference optical filter.
The infrared light that infrared light supply sends becomes the light pipe that directional light enters into probe through parabolic mirror, and in order to prevent the decay of infrared ray in light pipe, we use quartzy inwall as light pipe.What pop one's head in is a concave mirror foremost, and the Infrared that light pipe is come reflexes to a condenser lens, gets back to the reception light pipe after the focusing.Enter into optical table then.In optical table, at different gas, we adopt different measuring methods.For CO, NO, the gas that is easily disturbed by the absorption spectrum of other gas that HCL is such adopts single beam, the air chamber method of single wavelength.The measurement gas disturbed by other gas absorption spectra of being not easy for other adopts single beam, the optical filter method of dual wavelength.The rearmost end of optical table is a condenser lens, and the infrared ray after being absorbed is focused on the infrared photoelectric sensor.Owing to there is not a movable part, so for the measuring-signal and the reference signal of each gas, an infrared photoelectric sensor will be arranged all, each photoelectric sensor all is installed on the circuit board.Like this,, just need two circuit boards,, just need four circuit boards if we measure two kinds of gases if we measure a kind of gas.
System architecture of the present utility model as shown in Figure 1, in Fig. 1, the online gas analyzer of infrared ray mainly is made up of light path part and circuit part two parts, and wherein light path part comprises infrared light supply 1, parabolic mirror 2, light pipe 3, spherical reflector 4, condenser lens 5, four condenser lenses, three right angle spectroscopes, three narrow band pass filters, two air chambers, four infrared photoelectric sensors and plane mirror 15.
The infrared light that infrared light supply 1 sends becomes the emission light pipe (the first half of light pipe 3) that directional light enters into the light pipe 3 of probe through parabolic mirror 2, at probe is spherical reflector 4 foremost, spherical reflector 4 reflexes to condenser lens 5 to the Infrared of coming from the emission light pipe, get back to the reception light pipe (the latter half of light pipe 3) of light pipe 3 after Infrared line focus lens 5 focus on, enter into optical table then.In optical table, at different gas, we adopt different measuring methods.For CO, NO, the gas that is easily disturbed that HCL is such, the air chamber method of employing single beam, single wavelength by the absorption spectrum of other gas.For other the measurement gas disturbed by other gas absorption spectra of being not easy, adopt the optical filter method of single beam, dual wavelength.
After infrared ray enters optical table, through right angle spectroscope 6 infrared ray is divided into vertical two-beam uniformly earlier.We suppose a branch of light single beam, and the air chamber method of single wavelength is measured; Another Shu Guangyong single beam, the optical filter method of dual wavelength is measured.
When the air chamber method that adopts single beam, single wavelength is measured, infrared beam is earlier through the narrow band pass filter 7 corresponding to this kind gas absorption, and then be divided into vertical two-beam uniformly through right angle spectroscope 8, and wherein a branch of light is used for reference measurement, and a branch of light is used for gasmetry.The light beam elder generation process of reference measurement is full of the air chamber 9 of this kind gas of 99.9% above concentration, arrives infrared photoelectric sensor 11 through time condenser lens 10 then.The light beam of gasmetry is earlier through empty air chamber 14, and process time condenser lens 13 is to infrared photoelectric sensor 12 then.
When adopting the optical filter method of single beam, dual wavelength, the infrared ray that the level of process optical splitter 6 penetrates arrives first the angle that plane mirror 15 changes light beams, be divided into vertical two-beam uniformly through spectroscope 16 then, a branch of light is used for reference measurement, and a branch of light is used for gasmetry.The light beam of gasmetry arrives infrared photoelectric sensor 19 through time condenser lens 18 then earlier through the narrow band pass filter 17 corresponding to measured gas absorption.The light beam of reference measurement is earlier through the narrow band pass filter 20 without any the wavelength of gas absorption near the absorbing wavelength of tested gas, then through time condenser lens 21 to infrared photoelectric sensor 22.
Infrared photoelectric sensor is realized the transformation of light signal to electric signal, then through signal Processing such as amplification, filtering, thereby obtains the gas analysis result.
Circuit part is made up of power supply (not shown), photoelectric sensor, amplifier section (not shown), filtering part (not shown), conversion of signals part (not shown).The function of power supply is to each circuit part power supply.The function of photoelectric sensor is that light intensity is transformed into the correspondent voltage signal.Each photoelectric sensor all is installed on the circuit board.Amplifier section is the voltage signal that the millivolt signal of sensor output is transformed into the 1-5 volt.The filtering part filters the clutter in the electric signal.Conversion of signals partly is the industry standard signal that the voltage signal of 1-5 volt is converted to 4-20mA.The range of the gas of setting according to us and the current signal that records just can be known the gas concentration that we will measure.
The utility model structurally adopts the sonde-type structure.Probe adopts sintered stainless steel as outer wall, and the hole of sintered stainless steel is 2 μ, and gas molecule can see through and go, but the particulate of dust can't see through and goes, and this has just been avoided the influence of dust in measuring process.For preventing that water vapor condensation from causing corrosion and polluting optical window probe, this probe has designed heating tape between probe core and outer wall.Temperature according to measurement environment can be heated to 150 ℃ or higher to probe temperature.This has just well been avoided influence and the corrosion to pop one's head in of condensation to light path.
Claims (5)
1, the online gas analyzer of a kind of infrared ray is characterized in that: the online gas analyzer of this infrared ray comprises light path part and circuit part;
Described light path part comprises infrared light supply (1), parabolic mirror (2), light pipe (3), spherical reflector (4), condenser lens (5) and optical table part, and described optical table comprises three right angle spectroscopes (6,8,16), three narrow band pass filters (7,17,20), two air chambers (9,14), four condenser lenses (10,13,18,21), a plane mirror (15) and four infrared eyes (11,12,19,22); The infrared light that described infrared light supply (1) sends enters into light path system through described parabolic mirror (2), got back to optical table after spherical reflector (4) reflection line focus lens (5) focusing, be divided into four bundle light later on by twice beam split of two spectroscopes then, photoelectric sensor is arrived in processing through optical filter, inferior condenser lens, finishes by the transformation of light signal to electric signal;
Described circuit part is grouped into by power supply, photoelectric sensor, amplifier section, filtering part, signal conversion part; Light signal is transformed into the correspondent voltage signal via photoelectric sensor, through amplifier section voltage signal is amplified then, through the filtering part clutter in the signal is filtered, and converts voltage signal to industry standard signal by the conversion of signals part at last.
2, the online gas analyzer of infrared ray as claimed in claim 1 is characterized in that also comprising probe segment in light path part, the sintered stainless steel that described probe segment employing hole is 2 μ is provided with heating tape as outer wall between probe core and outer wall.
3, the online gas analyzer of infrared ray as claimed in claim 1 is characterized in that described optical table is divided into single beam, single wavelength air chamber optical table and single beam, dual wavelength optical filter optical table two parts.
4, the online gas analyzer of infrared ray as claimed in claim 3 is characterized in that described single beam, single wavelength air chamber optical table comprise air chamber (9,14), inferior condenser lens and infrared photoelectric sensor.
5, the online gas analyzer of infrared ray as claimed in claim 3 is characterized in that described single beam, dual wavelength optical filter optical table comprise narrow band pass filter, inferior condenser lens and infrared photoelectric sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520115662 CN2886556Y (en) | 2005-08-02 | 2005-08-02 | Infrared online gas analyzer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520115662 CN2886556Y (en) | 2005-08-02 | 2005-08-02 | Infrared online gas analyzer |
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|---|---|
| CN2886556Y true CN2886556Y (en) | 2007-04-04 |
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|---|---|---|---|
| CN 200520115662 Expired - Fee Related CN2886556Y (en) | 2005-08-02 | 2005-08-02 | Infrared online gas analyzer |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944364A (en) * | 2012-11-26 | 2013-02-27 | 中国科学技术大学 | Hydrocarbon combustible gas leakage monitoring device and method based on network transmission |
| CN103217405A (en) * | 2013-03-21 | 2013-07-24 | 浙江大学 | Microfluidic contrast optical path detection system |
| CN103712953A (en) * | 2014-01-13 | 2014-04-09 | 南京顺泰科技有限公司 | Sulfur hexafluoride gas component analyzer |
| CN108827906A (en) * | 2018-04-20 | 2018-11-16 | 合肥工业大学 | A kind of near infrared spectrum multicomponent gas on-line detecting system and method |
| CN110036278A (en) * | 2016-12-12 | 2019-07-19 | 黑拉有限责任两合公司 | The measuring device and method for micronic dust measurement for motor vehicle |
-
2005
- 2005-08-02 CN CN 200520115662 patent/CN2886556Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944364A (en) * | 2012-11-26 | 2013-02-27 | 中国科学技术大学 | Hydrocarbon combustible gas leakage monitoring device and method based on network transmission |
| CN103217405A (en) * | 2013-03-21 | 2013-07-24 | 浙江大学 | Microfluidic contrast optical path detection system |
| CN103217405B (en) * | 2013-03-21 | 2015-03-04 | 浙江大学 | Microfluidic contrast optical path detection system |
| CN103712953A (en) * | 2014-01-13 | 2014-04-09 | 南京顺泰科技有限公司 | Sulfur hexafluoride gas component analyzer |
| CN110036278A (en) * | 2016-12-12 | 2019-07-19 | 黑拉有限责任两合公司 | The measuring device and method for micronic dust measurement for motor vehicle |
| CN108827906A (en) * | 2018-04-20 | 2018-11-16 | 合肥工业大学 | A kind of near infrared spectrum multicomponent gas on-line detecting system and method |
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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: 20070404 Termination date: 20140802 |
|
| EXPY | Termination of patent right or utility model |