CN102680418A - Online detecting method for process gas concentration based on LabVIEW software - Google Patents
Online detecting method for process gas concentration based on LabVIEW software Download PDFInfo
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- CN102680418A CN102680418A CN2012101614162A CN201210161416A CN102680418A CN 102680418 A CN102680418 A CN 102680418A CN 2012101614162 A CN2012101614162 A CN 2012101614162A CN 201210161416 A CN201210161416 A CN 201210161416A CN 102680418 A CN102680418 A CN 102680418A
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Abstract
The invention discloses an online detecting method for process gas concentration based on LabVIEW software. The method comprises the following steps of: directly mounting an online detecting device on a measurement point of a process flue, and opening an air inlet valve and an air outlet valve of the detecting device; detecting the concentration, the temperature, the pressure, the humidity, the flow rate and other parameters of tested gas through a detecting module and a sensor module, acquiring data by using a data acquisition card, and then, transmitting the acquired data to a computer provided with gas concentration online detecting software based on LabVIEW software development through a PCI (Peripheral Controller Interconnect bus, and analyzing the data to obtain a relevant parameter value to realize real-time online detection. The online detecting method has the following advantages that sample preprocessing is not needed, the response time is shortened, the cost is reduced and the measurement precision is improved; the ppm-grade concentration can be detected on line; and a human-computer interface with the LabVIEW software is simple in operation, powerful in function and high in reliability, and by combining the PCI bus and the data acquisition card, multi-path signal acquisition can be realized, and an analog/digital input and output interface is supported.
Description
Technical field
Technical field is Digital Detecting and areas of information technology under the present invention, particularly a kind of process gas concentration on-line detection method based on LabVIEW software.
Background technology
It mainly is to SO on each class process flue of thermal power plant, garbage burning factory, iron and steel petrochemical industry burning boiler that present process industry blowdown waste gas both domestic and external detects
2, NO
X, NH
3, HCl, HF, H
2Gases such as S carry out online detection.Conventional procedures gas analysis detection method mainly is a chemical method; Chemical method need be done the pre-service of sample usually, the process complicated and time consumption, and receive the interference of other materials easily; Also possibly cause artefact; Especially be not suitable for real-time continuous coverage, exist the measurement poor accuracy, shortcomings such as sampling pretreatment system complicacy, Measuring Time length, poor reliability.
Summary of the invention
The purpose of this invention is to provide a kind of process gas concentration on-line detection method based on LabVIEW software.This online test method need be accomplished by LabVIEW software.
Concrete steps are:
(1) a kind of on-line measuring device that is used for the process industry gas concentration is set, comprises power module, detection module, amplification filtering circuit, sensor assembly, signal connector, data collecting card and computing machine; One end of detection module directly is connected measurement point and measures; The other end of detection module is connected with signal connector through the amplification filtering circuit; Signal connector and data acquisition card connection; Data collecting card is connected with computing machine, and sensor assembly also is to be connected to data collecting card through signal connector;
Said detection module comprises Optical Transmit Unit and light receiving unit, and wherein Optical Transmit Unit comprises light source chamber and convergent lens, and light receiving unit comprises catoptron, collector lens, monochromator or optical filter and photodetector; Sensor assembly comprises gas sensor, temperature sensor, pressure transducer, humidity sensor and flow sensor; Wherein gas sensor is installed in the tested gas passage and can selects according to the different detection demand, and temperature sensor, pressure transducer, humidity sensor and flow sensor are installed in the gas admittance valve porch; Data collecting card is based on pci bus 32 road analog input channels, 4 tunnel analog output channels, and the high-speed collection card of the digital I/O port of 48 road TTL/CMOS level adopts the conversion of 16bit high-speed a/d, and sampling rate reaches as high as 2.8MS/s, and digital dock reaches 10MHz;
(2) the said on-line measuring device of step (1) is directly installed on the measurement point of process flue, opens the gas admittance valve and the air outlet valve of detection module;
(3) a part of process gas is directly detected by said temperature sensor, pressure transducer, humidity sensor and the flow sensor that is installed in the gas admittance valve porch of step (1); Directly carry data to data collecting card, another part process gas gets into tested gas passage through gas admittance valve becomes tested gas;
(4) light that sends from the light source chamber of launching receiving element forms a branch of directional light through convergent lens; Pass the tested gas that step (3) is collected; The light that penetrates passes through tested gas passage once more through mirror reflects; Received by the photodetector of emission receiving element then, photodetector changes into electric signal to the light signal that receives;
(5) electric signal of step (4) is sent into data collecting card through signal connector after the amplification filtering processing of circuit; The data of gathering are transported to computing machine through pci bus; Through the online detection software analysis of installing on the computing machine of the gas concentration based on the LabVIEW software development, obtain the parameter values such as concentration, temperature, pressure, humidity, flow velocity of tested gas;
(6) the tested gas that has detected gets into the process flue and process gas converges again through air outlet valve; Dynamic real-time monitoring, storage and the analysis of the various parameter values of implementation procedure gas; And institute is surveyed data be passed to each remote monitoring workstation, realize information sharing through the Internet and switch;
The said mode that is installed in line detector be plug-in type, to the dress formula and reflective in a kind of.
Different with conventional procedures gas analysis detection method, the present invention uses based on the online detection software of the gas concentration of LabVIEW software development, has following advantage:
(1) pick-up unit that uses of the present invention is directly installed on measurement point and measures in real time, can significantly improve measuring accuracy, need not the sample preprocessing process simultaneously and analyzes cabin, effectively shortens the response time and reduces cost;
(2) the present invention adopts gas molecule absorption spectrum technology, can onlinely detect ppm level concentration, and the response time is fast;
(3) the LabVIEW software man-machine interface used of the present invention, simple to operate, powerful, reliability is high, the data collecting card of the pci bus that is adopted can realize that multiple signals gather simultaneously, supports simulation, digital input-output interface;
The online detection software of the gas concentration based on the LabVIEW software development of (4) installing on the computing machine can be according to actual conditions configuration data capture card interface resource; And adopt its multithreading; With a plurality of independently tasks in parallel operations; Improve the utilization factor and the execution speed of device, realized the functions such as online detection, data storage and analysis of industrial flow gas.
Description of drawings
Fig. 1 is the online testing process synoptic diagram of the present invention.
Fig. 2 connects synoptic diagram for the module of detection device thereof of the present invention.
Fig. 3 is the main interface function block diagram of the used LabVIEW software of the present invention.
Fig. 4 is data acquisition flow figure of the present invention.
Mark among the figure: 1-process gas; 2-temperature sensor, pressure transducer, humidity sensor and flow sensor position; The 3-gas admittance valve; The 4-air outlet valve; The 5-catoptron; 6-launches receiving element; The tested gas passage of 7-; The 8-data collecting card; The 9-pci bus; The 10-computing machine; The 11-printer; The 12-the Internet; The 13-switch; 14-remote monitoring workstation.
Embodiment
Embodiment:
(1) a kind of on-line measuring device that is used for the process industry gas concentration is set, comprises power module, detection module, amplification filtering circuit, sensor assembly, signal connector, data collecting card and computing machine; One end of detection module directly is connected measurement point and measures; The other end of detection module is connected with signal connector through the amplification filtering circuit; Signal connector and data acquisition card connection; Data collecting card is connected with computing machine, and sensor assembly also is to be connected to data collecting card through signal connector;
Said detection module comprises Optical Transmit Unit and light receiving unit, and wherein Optical Transmit Unit comprises light source chamber and convergent lens, and light receiving unit comprises catoptron, collector lens, monochromator or optical filter and photodetector; Sensor assembly comprises gas sensor, temperature sensor, pressure transducer, humidity sensor and flow sensor; Wherein gas sensor is installed in the tested gas passage and can selects according to the different detection demand, and temperature sensor, pressure transducer, humidity sensor and flow sensor are installed in the gas admittance valve porch; Data collecting card is based on pci bus 32 road analog input channels, 4 tunnel analog output channels, and the high-speed collection card of the digital I/O port of 48 road TTL/CMOS level adopts the conversion of 16bit high-speed a/d, and sampling rate reaches as high as 2.8MS/s, and digital dock reaches 10MHz;
(2) the said on-line measuring device of step (1) is directly installed on the measurement point of process flue, opens the gas admittance valve and the air outlet valve of detection module;
(3) a part of process gas is directly detected by said temperature sensor, pressure transducer, humidity sensor and the flow sensor that is installed in the gas admittance valve porch of step (1); Directly carry data to data collecting card, another part process gas gets into tested gas passage through gas admittance valve becomes tested gas;
(4) light that sends from the light source chamber of launching receiving element forms a branch of directional light through convergent lens; Pass the tested gas that step (3) is collected; The light that penetrates passes through tested gas passage once more through mirror reflects; Received by the photodetector of emission receiving element then, photodetector changes into electric signal to the light signal that receives;
(5) electric signal of step (4) is sent into data collecting card through signal connector after the amplification filtering processing of circuit; The data of gathering are transported to computing machine through pci bus; Through the online detection software analysis of installing on the computing machine of the gas concentration based on the LabVIEW software development, obtain the parameter values such as concentration, temperature, pressure, humidity, flow velocity of tested gas;
(6) the tested gas that has detected gets into the process flue and process gas converges again through air outlet valve; Dynamic real-time monitoring, storage and the analysis of the various parameter values of implementation procedure gas; And institute is surveyed data be passed to each remote monitoring workstation, realize information sharing through the Internet and switch;
The said mode that is installed in line detector is a plug-in type.
Claims (1)
1. process gas concentration on-line detection method based on LabVIEW software is characterized in that concrete steps are:
(1) a kind of on-line measuring device that is used for the process industry gas concentration is set, comprises power module, detection module, amplification filtering circuit, sensor assembly, signal connector, data collecting card and computing machine; One end of detection module directly is connected measurement point and measures; The other end of detection module is connected with signal connector through the amplification filtering circuit; Signal connector and data acquisition card connection; Data collecting card is connected with computing machine, and sensor assembly also is to be connected to data collecting card through signal connector;
Said detection module comprises Optical Transmit Unit and light receiving unit, and wherein Optical Transmit Unit comprises light source chamber and convergent lens, and light receiving unit comprises catoptron, collector lens, monochromator or optical filter and photodetector; Sensor assembly comprises gas sensor, temperature sensor, pressure transducer, humidity sensor and flow sensor; Wherein gas sensor is installed in the tested gas passage and can selects according to the different detection demand, and temperature sensor, pressure transducer, humidity sensor and flow sensor are installed in the gas admittance valve porch; Data collecting card is based on pci bus 32 road analog input channels; 4 tunnel analog output channels, the high-speed collection card of the digital I/O port of 48 road TTL/CMOS level, it has adopted the conversion of 16bit high-speed a/d; Sampling rate reaches as high as 2.8MS/s, and digital dock reaches 10MHz;
(2) the said on-line measuring device of step (1) is directly installed on the measurement point of process flue, opens the gas admittance valve and the air outlet valve of detection module;
(3) a part of process gas is directly detected by said temperature sensor, pressure transducer, humidity sensor and the flow sensor that is installed in the gas admittance valve porch of step (1); Directly carry data to data collecting card, another part process gas gets into tested gas passage through gas admittance valve becomes tested gas;
(4) light that sends from the light source chamber of launching receiving element forms a branch of directional light through convergent lens; Pass the tested gas that step (3) is collected; The light that penetrates passes through tested gas passage once more through mirror reflects; Received by the photodetector of emission receiving element then, photodetector changes into electric signal to the light signal that receives;
(5) electric signal of step (4) is sent into data collecting card through signal connector after the amplification filtering processing of circuit; The data of gathering are transported to computing machine through pci bus; Through the online detection software analysis of installing on the computing machine of the gas concentration based on the LabVIEW software development, obtain the parameter values such as concentration, temperature, pressure, humidity, flow velocity of tested gas;
(6) the tested gas that has detected gets into the process flue and process gas converges again through air outlet valve; Dynamic real-time monitoring, storage and the analysis of the various parameter values of implementation procedure gas; And institute is surveyed data be passed to each remote monitoring workstation, realize information sharing through the Internet and switch;
The said mode that is installed in line detector be plug-in type, to the dress formula and reflective in a kind of.
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| CN2012101614162A CN102680418A (en) | 2012-05-23 | 2012-05-23 | Online detecting method for process gas concentration based on LabVIEW software |
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| CN2012101614162A CN102680418A (en) | 2012-05-23 | 2012-05-23 | Online detecting method for process gas concentration based on LabVIEW software |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104503293A (en) * | 2014-11-13 | 2015-04-08 | 大亚湾核电运营管理有限责任公司 | Digital nuclear power station-loop data acquisition system and data processing method thereof |
| CN105158677A (en) * | 2015-09-24 | 2015-12-16 | 奇瑞汽车股份有限公司 | Circuit testing system based on LabVIEW and method thereof |
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| CN2186398Y (en) * | 1993-11-01 | 1994-12-28 | 胡传镛 | Laser interference harmful gas monitoring end instrument |
| CN1908623B (en) * | 2005-08-02 | 2010-05-05 | 德菲电气（北京）有限公司 | Multi-component infrared online gas analyzer |
| CN101776596A (en) * | 2010-02-03 | 2010-07-14 | 中北大学 | Gas density intelligent test system and method |
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2012
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2186398Y (en) * | 1993-11-01 | 1994-12-28 | 胡传镛 | Laser interference harmful gas monitoring end instrument |
| CN1908623B (en) * | 2005-08-02 | 2010-05-05 | 德菲电气（北京）有限公司 | Multi-component infrared online gas analyzer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104503293A (en) * | 2014-11-13 | 2015-04-08 | 大亚湾核电运营管理有限责任公司 | Digital nuclear power station-loop data acquisition system and data processing method thereof |
| CN105158677A (en) * | 2015-09-24 | 2015-12-16 | 奇瑞汽车股份有限公司 | Circuit testing system based on LabVIEW and method thereof |
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Application publication date: 20120919 |