CN103558265A - Automatic testing system with gas sensitive element - Google Patents
Automatic testing system with gas sensitive element Download PDFInfo
- Publication number
- CN103558265A CN103558265A CN201310519767.0A CN201310519767A CN103558265A CN 103558265 A CN103558265 A CN 103558265A CN 201310519767 A CN201310519767 A CN 201310519767A CN 103558265 A CN103558265 A CN 103558265A
- Authority
- CN
- China
- Prior art keywords
- gas
- test
- gas sensor
- sensor
- metering circuit
- 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.)
- Pending
Links
Images
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention discloses an automatic testing system with a gas sensitive element. The automatic testing system comprises an automatic gas distribution device, a circuit measurement part, a software control part and a computer which are connected with one another, wherein the automatic gas distribution device comprises the gas sensitive element, a temperature measurement element, a heating element and a mass flow meter; the circuit measurement part comprises temperature measurement, flow rate control, circuit measurement and signal acquisition; the software control part comprises A/D (analog to digital) and D/A (digital to analog) conversion.
Description
Technical field
The present invention relates to a kind of Auto-Test System, be specifically related to a kind of gas sensor Auto-Test System.
Background technology
Detect gas particularly volatile organic gas (VOC) in daily production and life, become more and more important, how convenient, fast and accurate detection they be research and the application direction of modern gas sensor.At present, for volatile organic gas, have different detection methods, mainly contain: utilize gas the characteristics such as the refractive index of light or light absorption to be detected to the optical method of gas, this method is more traditional, it installs complicated, uses and maintenance difficulty is large, cost is high; The electrochemical process of using electrode and electrolytic solution to detect gas, is also one of common method of gas detection, and it is widely used, but shortcoming is to be subject to environmental factor restriction more; Utilizing the electric method that semiconductor gas sensor detects is to apply in recent years a kind of maximum methods, develop very rapidly, has become one of output maximum in the world, most widely used sensor at present.Compare with other gas detection methods, semiconductor gas sensor is having its unique advantage aspect gas detecting: highly sensitive, fast response time, simple in structure, easy to use, low price etc.In the process of gas sensor test gas, because much VOC gas is all harmful to health, and VOC gas responds rapidly in course of reaction, high volatility, manual measurement error are very large, and the raising of element sensitivity is directly affected.
Summary of the invention
The invention provides a kind of gas sensor Auto-Test System, it is simple and direct, stable, signal strong, respond Auto-Test System fast, can the functions such as the distribution of system and signals collecting be realized automatically and being controlled.
Technical solution of the present invention:
A kind of gas sensor Auto-Test System, comprise interconnective automated gas divider, metering circuit part, software control and computing machine, its special character is: described automated gas divider comprises gas sensor, temperature element, heating element and mass flowmeter; Described metering circuit partly comprises temperature survey, flow control, metering circuit and signals collecting; Described software control comprises the conversion of A/D and D/A.
In above-mentioned automated gas divider, carrier gas and gas to be measured are inputted drying chamber by mass flow controller respectively and are fully mixed, and are made into the test chamber in test gas sample input test device.
It is to realize in test chamber that above-mentioned gas detects, and the test gas sample that configures concentration enters the test chamber of relative sealing, and gas sensor is positioned in test chamber, has respectively 4 potential electrode and two heating electrodes on gas sensor;
The working temperature of described gas sensor is measured by K type contact thermocouple sensor.
The invention has the advantages that: provide simple and direct, stable, signal strong, respond Auto-Test System fast, can the functions such as the distribution of system and signals collecting be realized automatically and being controlled.
Accompanying drawing explanation
Fig. 1 is catenation principle block diagram of the present invention.
Embodiment
Referring to Fig. 1, a kind of gas sensor Auto-Test System, comprises interconnective automated gas divider, metering circuit part, and software control and computing machine, automated gas divider comprises gas sensor, temperature element, heating element and mass flowmeter; Described metering circuit partly comprises temperature survey, flow control, metering circuit and signals collecting; Described software control comprises the conversion of A/D and D/A.
In automated gas divider, carrier gas and gas to be measured are inputted drying chamber by mass flow controller respectively and are fully mixed, and are made into the test chamber in test gas sample input test device.
It is to realize in test chamber that gas detects, and the test gas sample that configures concentration enters the test chamber of relative sealing, and gas sensor is positioned in test chamber, has respectively 4 potential electrode and two heating electrodes on gas sensor; The working temperature of gas sensor is measured by K type contact thermocouple sensor.
In work, the test gas sample of variable concentrations makes sensitive element surface different to gas absorption amount, and its resistance value also can cause corresponding variation, metering circuit by Real-time Collection to voltage signal be sent in testing software.The measuring-signal that metering circuit detects is in PCI-83l9 photoelectricity isolation mode incoming interface card input computer-controlled program.In real work, in order to meet the needs of distribution concentration broadness and to guarantee precision, the output of Standard Gases sample is not a road, but is divided into two-way or multichannel, the mass flow controller of respectively hanging oneself is connected with proving installation, realizes respectively the mixing match requirement of gas with various under variable concentrations.Mass rate is controlled, and precision is ± 0 .l% F. S(full scale).It adopts the mass rate (without temperature pressure compensation) of kapillary heat transfer temperature difference calorimetric principle measurement gas.The flow signal that sensor heating is recorded is sent into amplifier, and the flow detection voltage after amplification compares with measuring voltage, then removes regulating and controlling valve after difference signal is amplified, and the flow that passage is flow through in closed-loop control makes it to equate with the flow of setting.The flow detection voltage of controller output is directly proportional to the mass rate that flows through passage, and flow detection output voltage is+5 V.The flow control scope of mass flow controller is that 2%～l00%F. S(range ratio is 50:l), flow resolution is 0 .l%F. S.
Claims (3)
1. a gas sensor Auto-Test System, comprises interconnective automated gas divider, metering circuit part, and software control and computing machine, is characterized in that: described automated gas divider comprises gas sensor, temperature element, heating element and mass flowmeter; Described metering circuit partly comprises temperature survey, flow control, metering circuit and signals collecting; Described software control comprises the conversion of A/D and D/A.
2. gas sensor Auto-Test System according to claim 1, it is characterized in that: in described automated gas divider, carrier gas and gas to be measured are inputted drying chamber by mass flow controller respectively and fully mixed, be made into the test chamber in test gas sample input test device.
3. according to gas sensor Auto-Test System described in claim 1 or 2, it is characterized in that: it is to realize in test chamber that described gas detects, the test gas sample that configures concentration enters the test chamber of relative sealing, gas sensor is positioned in test chamber, has respectively 4 potential electrode and two heating electrodes on gas sensor; The working temperature of described gas sensor is measured by K type contact thermocouple sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310519767.0A CN103558265A (en) | 2013-10-29 | 2013-10-29 | Automatic testing system with gas sensitive element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310519767.0A CN103558265A (en) | 2013-10-29 | 2013-10-29 | Automatic testing system with gas sensitive element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103558265A true CN103558265A (en) | 2014-02-05 |
Family
ID=50012574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310519767.0A Pending CN103558265A (en) | 2013-10-29 | 2013-10-29 | Automatic testing system with gas sensitive element |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103558265A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104076122A (en) * | 2014-05-26 | 2014-10-01 | 电子科技大学 | Temperature continuously-adjustable point-contact gas-sensitive humidity-sensitive test cavity |
| CN104297297A (en) * | 2014-10-24 | 2015-01-21 | 大连民族学院 | Measuring system and method of gas response sensitivity in oxygen-free environment |
| CN105403597A (en) * | 2015-12-02 | 2016-03-16 | 浙江大学 | Impedance type gas sensitive material and preparation method thereof |
| CN106406395A (en) * | 2016-08-28 | 2017-02-15 | 桂林市晶准测控技术有限公司 | Gas sensor test system |
| CN111289582A (en) * | 2020-03-26 | 2020-06-16 | 合肥微纳传感技术有限公司 | MEMS gas sensor, array thereof, gas detection method and preparation method |
-
2013
- 2013-10-29 CN CN201310519767.0A patent/CN103558265A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104076122A (en) * | 2014-05-26 | 2014-10-01 | 电子科技大学 | Temperature continuously-adjustable point-contact gas-sensitive humidity-sensitive test cavity |
| CN104297297A (en) * | 2014-10-24 | 2015-01-21 | 大连民族学院 | Measuring system and method of gas response sensitivity in oxygen-free environment |
| CN104297297B (en) * | 2014-10-24 | 2017-01-11 | 大连民族学院 | Measuring system and method of gas response sensitivity in oxygen-free environment |
| CN105403597A (en) * | 2015-12-02 | 2016-03-16 | 浙江大学 | Impedance type gas sensitive material and preparation method thereof |
| CN106406395A (en) * | 2016-08-28 | 2017-02-15 | 桂林市晶准测控技术有限公司 | Gas sensor test system |
| CN111289582A (en) * | 2020-03-26 | 2020-06-16 | 合肥微纳传感技术有限公司 | MEMS gas sensor, array thereof, gas detection method and preparation method |
| CN111289582B (en) * | 2020-03-26 | 2022-03-11 | 微纳感知(合肥)技术有限公司 | MEMS gas sensor, array thereof, gas detection method and preparation method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103558265A (en) | Automatic testing system with gas sensitive element | |
| CN203719811U (en) | Weak voltage signal detection device of micro-voltage sensor | |
| CN104965009A (en) | Hydrogen concentration detector | |
| CN104897859A (en) | Indoor methanol concentration detecting system with temperature compensating function | |
| CN202083655U (en) | Automatic calibration device for catalytic-combustion-type methane gas detector | |
| CN102879354A (en) | Digital signal processing and controlling system of nondispersive infrared gas analyzer | |
| CN202903705U (en) | Testing device for dynamic vacuum stability test | |
| CN202854070U (en) | On-line detecting device for components of coal quality | |
| CN203587548U (en) | Automatic test system for gas sensitive element | |
| CN1996003A (en) | On-line monitoring method for concentration rate of circulating cooling water | |
| CN106645972A (en) | Platform used for detecting resistance value of small resistor | |
| CN102866180A (en) | High-precision intelligent acidity meter and measuring method thereof | |
| CN105651936A (en) | Gas sensor comprehensive tester and measurement method thereof | |
| CN204269258U (en) | Intelligent thermocouple tester | |
| CN102520013B (en) | Hot-film gas extinguishing chemical concentration sensing module | |
| CN201622258U (en) | Automatic oil gas concentration detector | |
| CN205049548U (en) | Gas sensor's temperature compensated equipment | |
| CN103616416A (en) | Adaptive ion meter and ion concentration measure method by the same | |
| CN106197697A (en) | A kind of temperature-detecting device | |
| CN204154630U (en) | For the optical detection apparatus that D-Dimer detects | |
| CN105891313A (en) | Portable potentiostat application platform based on vitamin B detection | |
| CN206378535U (en) | A kind of detection platform of small resistor resistance | |
| CN205749377U (en) | A kind of measurement equipment of radial flow sediment content | |
| CN104316890B (en) | Voltage, electric current precision metering device and delicate metering method based on satellite navigation system | |
| CN204359760U (en) | Gas chromatograph electronic closed loop formula gas flow automatic calibration control device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140205 |