CN2213335Y - Portable universal infrared gas analyser - Google Patents
Portable universal infrared gas analyser Download PDFInfo
- Publication number
- CN2213335Y CN2213335Y CN 94247430 CN94247430U CN2213335Y CN 2213335 Y CN2213335 Y CN 2213335Y CN 94247430 CN94247430 CN 94247430 CN 94247430 U CN94247430 U CN 94247430U CN 2213335 Y CN2213335 Y CN 2213335Y
- Authority
- CN
- China
- Prior art keywords
- infrared
- air chamber
- gas analyzer
- gas
- microcomputer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model discloses a portable universal infrared gas analyzer which is designed for the detection of CO2, CO, CH4, SO2, and various other gases in environmental protection, sanitation and epidemic prevention, industrial process monitoring, etc. The utility model with simple optical paths has no moving parts, and an infrared light source has small volume and high efficiency. A spectrum selector is used for changing tuning wavelength, and a thermopile matrix infrared detector with high sensitivity is used. A measurement update converting gas path which is composed of a three-way valve and an ascarite filter is arranged in front of a gas room, and a zero point and a full scale can be automatically corrected without using standard gas so that drift is eliminated. Using a microcomputer for controlling fully automatic operation, the utility model has the advantages of high precision, stability, and reliability, high universality, small volume, and convenient carrying.
Description
The utility model belongs to analytical instrument.
Utilize gas to infrared radiation selectively the achromatic infrared gas analyzer made of principle of absorption have multiple, adopting the film microphone mostly is detector, differences such as twin-beam, tandem, monolateral staggered form are arranged by its light path, physical construction is complicated unusually, typical twin-beam infrared gas analyzer as shown in Figure 5, by motor 51, light source 52, cut mating plate 53, analysis room 54, reference cell 55 and film microphone more than 56 parts and form.
The another kind of infrared gas analyzer that adopts semiconductor detector, as the time double light path infrared gas analyzer formed with indium antimonide or lead selenide etc. as shown in Figure 6, the modulating system that one cover driven by motor is also arranged, comprise motor 61, light source 62, reference optical filter 63, analysis filter 66, analysis room 64 and indium antimonide detector 65 etc., complex structure, poor reliability.
Also have a kind of infrared gas analyzer that adopts photocaustic spectroscopy, though highly sensitive and can carry out polycomponent and measure, also be complex structure, volume is bigger, and inconvenience is carried on the spot and is measured.The infrared gas analyzer of another electric chemical formula can accomplish that miniaturization is easy to carry, and has the life-span short again, shortcomings such as low precision.
In a word, the most of complicated in mechanical structure of above-mentioned instrument of prior art, poor reliability though great majority adopt microcomputer control, has improved automatization level, because volume and weight is all bigger, is not easy to carry with in-site measurement and uses.
The purpose of this utility model provide a kind of simple in structure, reliability is high, versatility good, full automatic working and portable infrared gas analyzer.
The utility model realizes that by following proposal all analyzer comprises light path and detecting device, and the control and the display part that comprise microcomputer, power supply etc.Be characterized in that light path and test section do not have moving components such as motor, its optical routing infrared light supply, air chamber, infrared light transmission sheet, spectrum selector are formed, pyroscan adopts can directly detect infrared ray and the thermoelectric pile matrix pyroscan of output voltage signal, before the draft tube of air chamber, by a measurement update conversion gas circuit of forming by T-valve and alkali asbestos filter; Pre-amplifier, microcomputer, display, measurement update switch, light source power, freedom from repairs solid state battery and the charging circuit be made up of two operational amplifiers of the main promising adaptation probe designs of electric part are made up of microcomputer-controlled automatic measuring system.
Expression the present utility model content and embodiment have the following drawings.
The test section of Fig. 1, portable general infrared gas analyzer (light path and measurement update conversion gas circuit)
Fig. 2, the utility model infrared light supply structure
The electric part block scheme of Fig. 3, this instrument
Pre-amplifier in Fig. 4, this instrument electric part
Fig. 5, twin-beam infrared gas analyzer (prior art)
Fig. 6, semiconductor detector double light path infrared gas analyzer (prior art)
As shown in Figure 1, the optical routing infrared light supply 1 of the utility model infrared gas analyzer, air chamber 2, spectrum selector 3, infrared light transmission sheet 6, thermoelectric pile matrix infrared eye 4 are formed, light path is very simple, and not as moving components such as motors, the reliability of this instrument is greatly improved, the characteristics of this instrument also were before the draft tube 21 of air chamber 2, were communicated with the measurement update of forming by one by alkali asbestos filter 8 and T-valve 7 and changed gas circuit 5.Between measurement update conversion gas circuit 5 and the draft tube 21 kapillary 9 is housed also.
Be communicated with in the measurement update conversion gas circuit 5 that is connected into annular by T-valve 7 and alkali asbestos filter 8, detected gas enters gas circuit from the import of T-valve 7, this gas circuit is connected with the draft tube 21 of air chamber 2 by kapillary 9 then from drawing the fairlead of detected gas between T-valve 7 and the filtrator 8.Handle T-valve 7, the detected gas that enters measurement update conversion gas circuit 5 can enter air chamber 2 by filtrator 8 and kapillary 9, also can directly enter air chamber 2 by kapillary 9 without filtrator 8, realizes proofreading and correct and the conversion of measuring.The effect of kapillary 9 in gas circuit is throttling and constant current.
The thermoelectric pile matrix pyroscan 4 that present embodiment adopts is 100 dot matrixs, and sensitive elemental size is 2 millimeters * 2 millimeters.
For design feature of the present utility model is described, introduce the formation and the principle of work of instrument earlier.Fig. 3 has represented the utility model complete machine theory of constitution block scheme, and light path 101 comprises infrared light supply 1, the air chamber 2 of infrared light transmission sheet 6 is housed, and spectrum selector 3 is measured and calibration shift gas circuit 107 is connected on before the draft tube 21 of air chamber 2.Detecting device 102 is a thermoelectric pile matrix pyroscan 4 with the signal transition of light is voltage signal, this voltage signal is sent into microcomputer 104 after pre-amplifier 103 amplifies, microcomputer 104 shows measurement result on display 105, also connect with the converter 106 that microcomputer 104 links with measurement and calibration shift gas circuit 107, in order to realize zero correction, the secondary of full scale is proofreaied and correct and normal conversion of measuring, and realizes full automatic working.
Because use thermoelectric pile matrix pyroscan 4 direct voltage output signals in this instrument, pre-amplifier 103 is also simple than the prior art circuit, easy to make.Pre-amplifier 103 as shown in Figure 4, it forms (for example can adopt 7650 types) by the operational amplifier A D1 and the AD2 of the low drift of secondary low noise.The inverting input of operational amplifier A D1 is by resistance R 1 ground connection, and in-phase input end connects input signal by capacitor C 1 ground connection by resistance R 2; Output terminal connects inverting input by resistance R 3, and capacitor C 2, C3 prevent self-excitation, and the in-phase input end of output terminal and AD2 links; The inverting input of AD2 is by resistance R 4 ground connection; Output terminal connects with inverting input by variable resistor R5, and capacitor C 4, C5 prevent self-excitation, and last, the AD2 output terminal connects with the input end of microcomputer 104.
The utility model instrument can be used two kinds of power supplys of AC and DC, carries rechargeable battery and makes direct supply, can continuous working 8 hours, and the cell voltage deficiency has warning device.
Infrared gas analyzer surveying work principle is based on baer's law:
I＝I
0e
－KCL
In the formula: the infrared energy that the I-detecting device is measured;
I
0The infrared energy that-infrared light supply sends;
The absorption coefficient of the tested gas of K-;
The concentration of the tested gas of C-;
The length of L-air chamber.
From baer's law as can be known, for a certain gas, absorption coefficient K fixes, the infrared energy I of infrared light supply
0Controlled, the air chamber length L also is design and fixing, so as long as measure infrared energy I from infrared detector, also just measured the concentration C of detected gas.In fact, radiation intensity when measuring a kind of gas variable concentrations also is converted to voltage signal by infrared eye, determine a certain normal concentration again, make a sets of curves of concentration and voltage relationship in view of the above and be stored in the microcomputer, during actual measurement, measure different voltage, microcomputer just can be read the concentration of tested gas according to internal memory, and shows automatically.
An important feature of the present utility model is that before formal the measurement, this instrument can automatically be finished zero point the correction of (0%) and full scale (100%), and this correction need not to use standard gas.Thisly be achieved in that in this instrument before the draft tube 21 of air chamber 2 an alkali asbestos filter 8 to be arranged from normal moveout correction, manipulation transforms T-valve 7, filtrator 8 can be linked in the gas circuit automatically and go, and causes CO in the gaseous sample
2Be absorbed fully, and think zero point, infrared radiation is not absorbed, and is 100%, is 1V; If cause the variation of 1V such as factors such as temperature, energy of light source variations, microcomputer can automatically be adjusted into 1V with it, alkali asbestos filter 8 switches from gas circuit then, tested gaseous sample directly enters air chamber 2 and measures, because it is the comparison that 1V begins to carry out gas absorption that microcomputer is all automatically controlled voltage at every turn, meet baer's law and absorb, thereby realized that secondary is from normal moveout correction, eliminated the influence of drift error, this instrument is had and kept high precision and high stability.
The utility model infrared gas analyzer has following outstanding feature:
(1) simple, the movement-less part of light path, reliability improves greatly, and volume is little, and is in light weight, is easy to carry.Present embodiment for example, the instrument volume for long 178 millimeters * wide 150 millimeters * high 50 millimeters, instrument can be used two kinds of power works of alternating current-direct current, both can use single-phase alternating current, again the rechargeable battery work that can carry with instrument.
(2) instrument has the function of automatic suppressed zero and full scale, and without standard gas, has eliminated drift, thus the accuracy of instrument height, good stability.
(3) be a kind of wide spectrum detecting instrument, usable range is wide, and versatility is good, when changing tested gas, as long as the optical filter in the replacing spectrum selector changes tuning wavelength and gets final product, and instrument is full automatic working, and single job just realizes from normal moveout correction until demonstrating measurement result.
The utility model is specially adapted to the field monitoring of various conditions such as the measurement of gases such as carbon dioxide, carbon monoxide, methane, sulphuric dioxide, particularly environmental protection, health and epidemic prevention, industrial flow.
Claims (6)
1, a kind of portable general infrared gas analyzer, the control and the display part that comprise light path and detecting device and comprise microcomputer, power supplys etc. is characterized in that not having in the light path moving components such as motor, are made up of infrared light supply 1, air chamber 2, infrared light transmission sheet 6, spectrum selector 3; Infrared eye adopts can directly detect infrared ray and the thermoelectric pile matrix pyroscan 4 of output voltage signal; Before the draft tube 21 of air chamber 2, a measurement update conversion gas circuit 5 is arranged; Comprise in the control of microcomputer and the display part that measurement update switch 103 is arranged, the pre-amplifier 106 that is made of two operational amplifier A D1 and AD2 is arranged between pyroscan 4 and microcomputer 107.
2, portable general infrared gas analyzer as claimed in claim 1, it is characterized in that measurement update conversion gas circuit 5 is made up of T-valve 7 and alkali asbestos filter 8, from the fairlead between T-valve 7 and the alkali asbestos filter 8, be connected with the draft tube 21 of air chamber 2 by capillary 9 again.
3, portable general infrared gas analyzer as claimed in claim 1, it is characterized in that air chamber 2 usefulness brass or fine aluminium make, the meticulous polishing of inside surface, as if gold-plated again after then polishing with the brass manufacturing, the bonding infrared light transmission sheet 6 usefulness calcium fluoride wafers of air chamber 2 both ends of the surface sealing are made.
4, portable general infrared gas analyzer as claimed in claim 1 is characterized in that the spectrum selector 3 between air chamber 2 and thermoelectric pile matrix infrared eye 4 is the sheet annulus, and the narrow band pass filter of different size is housed on it.
5, portable general infrared gas analyzer as claimed in claim 1 is characterized in that semisphere concave reflection face 11 surface gold-plating of infrared light supply 1, the about 8-12 millimeter of bulb diameter D, about 2 millimeters of the screw diameter d of filament 12, about 6 millimeters of length S.
6, portable general infrared gas analyzer as claimed in claim 1 is characterized in that instrument can use two kinds of power supplys of AC and DC, carries DC charging battery and undertension warning device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94247430 CN2213335Y (en) | 1994-12-16 | 1994-12-16 | Portable universal infrared gas analyser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94247430 CN2213335Y (en) | 1994-12-16 | 1994-12-16 | Portable universal infrared gas analyser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2213335Y true CN2213335Y (en) | 1995-11-22 |
Family
ID=33852660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94247430 Expired - Fee Related CN2213335Y (en) | 1994-12-16 | 1994-12-16 | Portable universal infrared gas analyser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2213335Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100378450C (en) * | 2005-09-15 | 2008-04-02 | 聚光科技（杭州）有限公司 | In-position gas analyzing system with in-position calibrating function |
| CN1886654B (en) * | 2003-12-12 | 2010-08-18 | 矿井安全装置公司 | Infrared gas sensor having a communication device and method of communicating calibration information from an infrared gas sensor |
| CN101281129B (en) * | 2005-09-15 | 2011-06-15 | 聚光科技(杭州)股份有限公司 | On-position type gas analysis system with on-position calibration function |
| CN103293158A (en) * | 2012-03-05 | 2013-09-11 | 江苏天瑞仪器股份有限公司 | Jade verification device and jade detector with same |
| 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 |
-
1994
- 1994-12-16 CN CN 94247430 patent/CN2213335Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1886654B (en) * | 2003-12-12 | 2010-08-18 | 矿井安全装置公司 | Infrared gas sensor having a communication device and method of communicating calibration information from an infrared gas sensor |
| CN100378450C (en) * | 2005-09-15 | 2008-04-02 | 聚光科技（杭州）有限公司 | In-position gas analyzing system with in-position calibrating function |
| CN101281129B (en) * | 2005-09-15 | 2011-06-15 | 聚光科技(杭州)股份有限公司 | On-position type gas analysis system with on-position calibration function |
| CN103293158A (en) * | 2012-03-05 | 2013-09-11 | 江苏天瑞仪器股份有限公司 | Jade verification device and jade detector with same |
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101504366B (en) | Oxygen concentration detecting instrument | |
| CN102661918A (en) | Off-resonance photoacoustic spectrometric detection and analysis device | |
| CN104237135A (en) | System and method for detecting CO gas based on quartz tuning fork enhanced photoacoustic spectrometry technology | |
| IL137895A (en) | Ndir instrument | |
| CN115326725B (en) | Chemical oxygen demand detecting system capable of automatically switching high range and low range | |
| CN2213335Y (en) | Portable universal infrared gas analyser | |
| US20190064035A1 (en) | Exhaust Gas Analysis Device, Exhaust Gas Analysis Method and Storage Medium Recording Programs for Exhaust Gas Analysis Device | |
| CN103115877A (en) | Optical detection system for measuring concentrations of different gases | |
| CN2243656Y (en) | Infrared carbon dioxide analyzer | |
| CN103149169B (en) | Utilize the method that the calibration system of trace aqueous vapor pick-up unit is demarcated device inside water | |
| CN102519937A (en) | Handheld Raman probe | |
| CN1204391C (en) | Method and appaatus for single-laser-sourceharmonic remote sensing gas detection | |
| CN111678886A (en) | TDLAS (tunable diode laser absorption spectroscopy) determination SF (sulfur hexafluoride)6Method for calibrating and verifying humidity in equipment | |
| CN2921827Y (en) | Portable photometer for measuring low concentration ozone | |
| CN117309764A (en) | Multi-gas concentration measuring instrument based on integral cavity | |
| CN110361354B (en) | Multi-gas concentration detection device, manufacturing method thereof and alarm device | |
| CN100343653C (en) | Absorbance monitor | |
| CN1657966A (en) | On-line testing system for capacity of vehicle lead-acid battery | |
| CN115684009A (en) | Small infrared gas sensor and working principle | |
| CN109239010A (en) | Gas monitoring method based on multiline spectral technique | |
| CN213749600U (en) | Laser methane sensor detection circuit | |
| US5498873A (en) | Refrigerant impurity analyzer | |
| CN201434836Y (en) | Optical and digital integrated dual-mode intelligent methane detector | |
| CN100419408C (en) | Infrared-ray gas analyser | |
| CN109781639B (en) | Device and method for simultaneously detecting sulfur dioxide and nitrogen dioxide in ambient air |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |