CN106053551A - Multi-channel multi-type sensor capability test system - Google Patents
Multi-channel multi-type sensor capability test system Download PDFInfo
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- CN106053551A CN106053551A CN201610628442.XA CN201610628442A CN106053551A CN 106053551 A CN106053551 A CN 106053551A CN 201610628442 A CN201610628442 A CN 201610628442A CN 106053551 A CN106053551 A CN 106053551A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0006—Calibrating gas analysers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
- G01N27/64—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using wave or particle radiation to ionise a gas, e.g. in an ionisation chamber
- G01N27/66—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using wave or particle radiation to ionise a gas, e.g. in an ionisation chamber and measuring current or voltage
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Abstract
The invention provides a multi-channel multi-type sensor capability test system. The system is composed of an air passage module, a test unit, a key module, an acquisition card and a host computer. The air passage module comprises an air chamber, a mini-size air pump, a first air inlet pipe, a second air inlet pipe, an air outlet pipe, a first solenoid valve and a second solenoid valve, wherein the air inlet pipes are joined up to form a channel communicating with an air inlet of the air chamber, the air outlet pipe is connected to an air outlet of the air chamber through the mini-size air pump; the first air inlet pipe is internally provided with the first solenoid valve, and the second air inlet pipe is internally provided with the second solenoid valve; and the solenoid valves are connected to the key module. The system can test dynamic response characteristics of sensors in different gases, such as ammonia and hydrogen sulfide, with different concentrations, and has the advantage of testing multi-channel multi-type sensors, thereby improving the detection efficiency and test accuracy.
Description
Technical field
The present invention relates to a kind of gas sensor Performance Test System, particularly relate to a kind of multichannel, Multiple Type sensing
Device Performance Test System.
Background technology
Gas sensor is a kind of by internal active substance sensing extraneous gas kind and concentration, and will by transducer
It is changed into optical, electrical grade can measure the device of physical quantity.According to its characteristic, gas sensor can be used for detecting various poisonous, easy
Combustion, explosive gas or liquid vapour, therefore all have widely in every field such as industrial, civilian and national defense and military
Application.
Static characteristic refer to sensor when each measured value is in steady statue, between output and input quantity
Relation, typically requires to keep linear between sensor output and input under quiescent conditions, so gives follow-up calculating meeting
Bring relatively convenience.The static characteristic of sensor mainly have the drift of following target temperature, the impact of flow, linear correlation degree, zero
Point drift, signal reproducibility and selectivity.Dynamic characteristic is the sensor response characteristic to time dependent input quantity.Dynamically
Characteristic present's sensor responding ability to variable signal, extremely endangers the sensor of gas for some occasion, such as monitoring,
Dynamic characteristic is even more important than static characteristic, in order to avoid there is major accident, it is desired to sensor did within the shortest time
Go out response to adopt an effective measure and processing.In order to promote its dynamic property, operative sensor have employed peaker etc.
Any special measures.
The method of testing of gas sensor currently mainly has constant-voltage method, constant flow method and electric resistance partial pressure method.Constant-voltage method be exactly
Gas sensor two ends directly plus constant voltage, determine its resistance value by measuring the electric current on gas sensor；Permanent
Stream method directly adds constant-current source to exactly gas sensor, determines its resistance by measuring the voltage at gas sensor two ends
Value.The major defect of these 2 kinds of methods is owing to the change in resistance scope of gas sensor is very big, typically has 4,5 quantity
The conversion of level, so that it is very big to measure curtage excursion, causes difficulty to measurement.Electric resistance partial pressure method is exactly to sensing
Device one build-out resistor of series connection, allow the resistance of build-out resistor and the resistance of sensor as close possible to, at sensor and coupling electricity
Resistance two ends are plus constant voltage, by measuring the voltage at build-out resistor two ends, the method indirectly obtaining resistance of sensor.This side
Method is easy to use, is also most method that uses the most both at home and abroad, therefore, determines that system uses electric resistance partial pressure method.
The gas sensing research of foreign study mechanism is mostly based on the test platform that separate devices is built, for being highly prone to
For the gas test of environmental disturbances, this kind of method is the most expensive, and tests effect and be heavily dependent on operator's
Proficiency level.The class ultra-high resistance test being likely to occur during air-sensitive is tested, A.Flammin et al. propose a kind of based on
The high resistant test circuit of capacitance integral, effective to fA level micro current, when resistance larger current is the least, accumulation to threshold electricity
Pressure needs several seconds even tens seconds.If enabling multiple channel test, then parasitic capacitance when switching is likely to have influence on integrating capacitor
Electricity.And increasingly difficult to the control comparison resistance of electric capacity fine leak electric current, it is difficult in actual applications make.
Henan Chinese prestige is one of domestic company entering gas sensing field the earliest, its test equipment HW-C30A quilt on sale
Duo Suo research unit uses.There is basic multiple channel test function, but cannot extend voluntarily, and based on manually changing exclusion
Test mode, precision is difficult to ensure that.The test system for the research of MOS gas sensor of Dalian University of Technology is carried at document
To test collecting part build based on Agilent company 34980A data collecting card, PC carried out by gpib interface on
Position machine controls, and the function of gas cylinder distribution part is then operated D/A board by PC by pci interface and controls mass flowmenter
(MFC) complete.This mode of building also is most MOS gas sensor research worker and the mode of mechanism's employing.Utilize business
Set up the test function of MOS gas sensor key property with pattern block, carry out the work of data acquisition and checking.Test
Mainboard is integrally placed in temperature and humidity control box, can preferably ensure the stability of ambient temperature and humidity.Systematic function depends on depending on
Rely the test performance and function provided in commercial board, it is difficult to according to characteristic and the testing requirement of some MOS gas sensor
Carry out free customization, be also not susceptible to be converted into real application research.
Summary of the invention
Present invention aims to can only detect present in current techniques the deficiency of single model sensor performance,
A kind of multichannel, polytypic gas sensor Performance Test System are provided.This test system by novel gas path module coordinate by
The test cell of the composition such as power supply circuits, sensor array, signal condition amplifying circuit, coordinates capture card to complete tested biography
The signals collecting of sensor, finally realizes being analyzed signal.The present invention not only can test gas with various such as ammonia, hydrogen sulfide
Deng the dynamic response characteristic at variable concentrations lower sensor, the most also there is the advantage that can measure multiple passage, multiple sensors,
Improve detection efficiency and also improve experiment accuracy.
A kind of multichannel polytypic sensor performance test system, the composition of this system include gas path module, test cell,
Key-press module, capture card and host computer；
The composition of described gas path module includes air chamber, micro air pump, air inlet pipe, air inlet pipe, escape pipe, electromagnetic valve and electromagnetism
Valve；Wherein, the path that described air inlet pipe, air inlet pipe merge into is connected with the air inlet of air chamber；Escape pipe is through air pump and air chamber
Gas outlet is connected；Electromagnetic valve and electromagnetic valve it is respectively arranged with in air inlet pipe, air inlet pipe；Electromagnetic valve and electromagnetic valve respectively with button mould
Block is connected；
Described test cell is arranged in air chamber, and its composition includes eight passages that power supply circuits are identical with composition, each
Passage composition includes sensor array, pre-amplification circuit and signal conditioning circuit；Its annexation is: power supply circuits respectively with
The sensor array of each passage, pre-amplification circuit are connected；Sensor array, pre-amplification circuit and signal in each passage
Modulate circuit is sequentially connected；The signal conditioning circuit of each passage is connected with capture card respectively, and capture card is connected with host computer；
The composition of described power supply circuits includes the Switching Power Supply of 12V, three terminal regulator, forward low dropout voltage regulator and negative electricity
Pressure produce chip, wherein, the Switching Power Supply of 12V is connected with three terminal regulator, three terminal regulator respectively with forward low pressure drop voltage stabilizing
Device, negative voltage produce chip and are connected.
The composition of described sensor array includes photoionization gas sensor socket and metal oxide sensor socket,
The two is connected by wire jumper；Photoionization gas sensor socket is connected with three terminal regulator, metal oxide sensor socket
It is connected with forward low dropout voltage regulator.
Described pre-amplification circuit composition includes chopper-zero-stabilized amplification chip；Three terminal regulator, negative voltage produce chip, light
Ionized gas sensor socket, metal oxide sensor socket are the most connected.
Described signal conditioning circuit composition includes a resistance, an electric capacity and Zener diode, wherein resistance one
Termination chopper-zero-stabilized amplification chip, the resistance other end and capacitances in series, electric capacity other end ground connection, electric capacity is with Zener diode also
Connection, Zener diode positive ending grounding, negative terminal is connected with capture card.
The invention have the benefit that
The present invention is a kind of novel test system that can simultaneously test Multiple Type, multiple sensor, has sensed
Device test system can not complete the test of the multiple individualities to variety classes sensor simultaneously.This patent is served a kind of novel multiple
Closing stench detection device, this device uses multiple sensor combinations of Multiple Type for difference detection environment, before assembly
The sensor characteristics needing test to be used, is rejected the individuality being unsatisfactory for performance requirement, and therefore this patent can realize
Test while different sensors is combined, draw the response curve of different sensors under a certain same gas environment and protect
Deposit, be analyzed obtaining a result by software program.
Below with reference to accompanying drawing, the technique effect of present inventive concept, concrete structure and generation is described further, so that
Those skilled in the art is fully understood from the purpose of the present invention and effect.
Accompanying drawing explanation
Fig. 1 is the overall structure block diagram of this multichannel polytypic sensor performance test system
Fig. 2 is the structured flowchart of this multichannel polytypic sensor performance test system and test unit
Fig. 3 is that this multichannel polytypic sensor performance tests system gas circuit modular structure schematic diagram
Fig. 4 is tested sensor ageing experimental signal oscillogram, wherein,
Fig. 4 .1 is tested sensor ageing experiment oscillogram up to late nine time in first day evening eight
Fig. 4 .2 is tested sensor ageing experiment oscillogram up to late nine time in second day evening eight
Fig. 4 .3 is tested sensor ageing experiment oscillogram up to late nine time in the 3rd day evening eight
Fig. 4 .4 is tested sensor ageing experiment oscillogram up to late nine time in the 4th day evening eight
Fig. 4 .5 is tested sensor ageing experiment oscillogram up to late nine time in the 5th day evening eight
Fig. 4 .6 is tested sensor ageing experiment oscillogram up to late nine time in the 6th day evening eight
Fig. 4 .7 is tested sensor ageing experiment oscillogram up to late nine time in the 7th day evening eight
Fig. 5 is tested sensor dynamic characteristic test experiments result oscillogram, wherein,
Fig. 5 .1 is first time tested sensor dynamic characteristic test experiments result oscillogram
Fig. 5 .2 is the tested sensor dynamic characteristic test experiments result oscillogram of second time
Fig. 5 .3 is the tested sensor dynamic characteristic test experiments result oscillogram of third time
Fig. 6 is the gas concentration-response magnitude broken line graph of tested sensor
Detailed description of the invention
A kind of multichannel polytypic sensor performance test system, this system is by gas path module 1, test cell 2, button mould
Block 3 capture card 4, host computer 5 five part form.
Described gas path module 1, is used for fixing, connecting test unit, meets under gas with various concentration gas sensor
The needs of dynamic response performance test.
Described test cell 2 is used for installing sensor to be measured, and output voltage signal carries out signal condition and amplification, and will
Signal transmits to capture card 4.
Described capture card 4 can Real-time Collection test cell transmission signal and transmit to host computer 5, thus realize in difference
Test to sensor dynamic characteristic under the conditions of gas concentration.
Described host computer 5 installs test analysis software, is analyzed the sensor signal collected processing, draws tested
The parameters of sensor.
Wherein,
The composition of described gas path module 1 as it is shown on figure 3, include air chamber 13, micro air pump 17, air inlet pipe 11, air inlet pipe 15,
Escape pipe 18, electromagnetic valve 12, electromagnetic valve 16.
The path that described air inlet pipe 11, air inlet pipe 15 merge into is connected with the air inlet of air chamber 13；Escape pipe 18 is through air pump
17 are connected with the gas outlet of air chamber 13；Electromagnetic valve 12 and electromagnetic valve 16 it is respectively arranged with in air inlet pipe 11, air inlet pipe 15；Electromagnetic valve
12 are connected with key-press module 3 respectively with electromagnetic valve 16.
Micro air pump is commercially available prod, and model is that the QC-1S type air that Beijing Municipal Institute of Labour Protection produces is adopted
Sample instrument, for autonomous device, internal dry cell power supply, is provided with the function buttons such as startup, stopping, flow velocity plus-minus, manual control.
Described key-press module 3 is connected with the electromagnetic valve 12 in gas path module 1 and electromagnetic valve 16 respectively.This module is used for controlling
Electromagnetic valve processed must close, for known technology, commercially.
Described test cell 2 is arranged in air chamber 13, and its composition is as in figure 2 it is shown, include that power supply circuits 20 are identical with composition
Eight passages, each passage composition include sensor array 21, pre-amplification circuit 22, signal conditioning circuit 23；It connects
Relation is: power supply circuits 20 are connected with sensor array 21, the pre-amplification circuit 22 of eight passages respectively；Each passage passes
Sensor array 21, pre-amplification circuit 22 and signal conditioning circuit 23 are sequentially connected；The signal conditioning circuit 23 of each passage with
Capture card 4 is connected, and capture card 4 is connected with host computer 5.
The composition of described power supply circuits 20 includes the Switching Power Supply of 12V, L7805 three terminal regulator, AMS1117 forward low pressure
Fall manostat and MAX660 negative voltage produce chip, and wherein, the Switching Power Supply of 12V is connected with L7805 three terminal regulator, L7805
Three terminal regulator produces chip with AMS1117 forward low dropout voltage regulator, MAX660 negative voltage respectively and is connected；The switch electricity of 12V
Source is connected with L7805 three terminal regulator and is converted into+5V unidirectional current；L7805 three terminal regulator and AMS1117 forward low pressure drop voltage stabilizing
Device connects, and exports+3.3V unidirectional current；L7805 three terminal regulator produces chip with MAX660 negative voltage and is connected, and exports-5V direct current
Electricity.
The composition of described sensor array 21 includes that photoionization gas sensor socket is inserted with metal oxide sensor
Seat, the two is connected by wire jumper；Photoionization gas sensor socket is connected with L7805 three terminal regulator, and metal-oxide passes
Sensor socket is connected with AMS1117 forward low dropout voltage regulator；L7805 three terminal regulator connects the+5V unidirectional current and light produced
Ionized gas sensor socket connects, and AMS1117 forward low dropout voltage regulator connects the+3.3V unidirectional current and metal oxygen produced
Compound sensor socket connects.
Described photoionization gas sensor socket is used for installing photoionization gas sensor to be measured.
Described metal oxide sensor socket is used for installing metal oxide sensor to be measured.
Described pre-amplification circuit 22 composition includes 7650 chopper-zero-stabilized amplification chips, L7805 three terminal regulator, MAX660
Negative voltage generation chip, photoionization gas sensor socket, metal oxide sensor socket are the most connected.
L7805 three terminal regulator connects the+5V unidirectional current produced and 7650 chopper-zero-stabilized amplification chips connect；MAX660 bears
Voltage produces chip and connects-5V the unidirectional current produced and the connection of 7650 chopper-zero-stabilized amplification chips；Photoionization gas sensor
The input signal produced with metal oxide sensor is connected with 7650 chopper-zero-stabilized amplification chips.
Described signal conditioning circuit 23 composition includes a resistance, an electric capacity and Zener diode, wherein a resistance
One termination 7650 chopper-zero-stabilized amplification chips, the resistance other end and capacitances in series, electric capacity other end ground connection, electric capacity and voltage stabilizing two pole
Pipe is in parallel, and Zener diode positive ending grounding, negative terminal is connected with capture card 4.
The input signal that 7650 chopper-zero-stabilized amplification chips produce is connected with resistance.
Described electromagnetic valve 12,16 is for controlling sample gas or the inflow of cleaning gas.
Described micro air pump 17 is used for providing negative pressure, by sample gas or cleaning gas suction air chamber 13.
Power supply circuits 20 are sensor array 21, pre-amplification circuit 22 provides running voltage；Sensor array 21 is used for
Sensor to be measured is installed；The voltage signal that sensor is exported by pre-amplification circuit 22 carries out scaling；Signal conditioning circuit
Sensor signal after 23 pairs of amplifications is filtered processing.
Described upper computer software program LabVIEW2012 is write, and can realize showing and store capture card in real time and adopt
The signal that collection arrives, and the characterisitic parameter of sensor is drawn by respective algorithms.Described software programming and related protocol are known
Technology.
The index of dynamic characteristic is typically response time.Sensor all has time delay, to electrochemistry to the response of object gas
Formula sensor response time is no more than 25 seconds, and the response time of PID sensor is no more than 3 seconds, metal oxide sensor
Response time and sensor store during atmospheric condition, to store time length relevant.
Responding this characteristic according to sensor time delay, set up single order delay model, transmission function is:
Signal normalization responsing excitation is:
The frequency-domain expression of signal response is:
Signal responding frequency-domain expression and carries out pull-type inverse transformation, the time-domain expression obtaining signal response is:
Y (t)=u (t) (1-e-τt) (4)
Signal response time-domain expression is gone normalized, obtains the model that gas signal is responded by each sensor
For:
Y (t)=A (1-e-τt) (5)
Wherein A is the sensor response quautity to gas signal, and τ is the sensor speed of response to gas signal, and reflection passes
The delay degree of sensor response.
Gas sensor, under best operating condition, contacts same gas, its resistance ratio Rs/R0
It is referred to as sensitivity with the characteristic of gas concentration change, represents with K:
K=Rs/R0 (6)
R in formula0It is gas sensor resistance value under regular air conditions (in pure air), RsFor gas sensor
Resistance value in finite concentration detected gas.
Specific embodiment one:
The sensor selected is carried out burin-in process, when experiment starts, controls key-press module and open electromagnetic valve 12, same to seasonal epidemic pathogens
Pump is started working, and is pumped into by nitrogen in gas path module 1, the metal oxide sensor socket of eight passages in test cell 2
Upper installation same model, with a batch of metal oxide sensor to be measured or at the photoionization gas sensing of eight passages
Installing same model on device socket, test with a batch of photoionization gas sensor to be measured, test cell 2 will simultaneously
In eight passages, the voltage signal of signal conditioning circuit 23 output is transmitted to host computer 5 by capture card 4.Ageing process continues
Carry out 7 days totally 168 hours, preserve experimental data at the end of experiment and data are analyzed.Pass with brand-new metal-oxide
As a example by sensor TGS2602, according to himself characteristic, in ageing process early stage, sensor voltage signal is unstable, and fluctuation is relatively
Greatly, when voltage signal undulate quantity is stablized ± 5%, illustrate that sensor ageing process terminates.
Intercept tested sensor waveform of time period up to late nine time in evening eight every day in seven days respectively, choose one of them quilt
Survey sensor ratio compared with the average of every section of waveform in its seven days experimental periods, oscillogram and experimental result as shown in Figure 4, seven sections of waveforms
Average voltage be followed successively by 2.40V, 2.72V, 2.54V, 2.87V, 2.85V, 2.96V, 3.02V, at laboratory constant temperature, nitrogen be
Under conditions of background gas, the same sensor average voltage in the same time period of every day can reflect the zero point of this sensor
Response condition, relatively above-mentioned seven numerical value are it appeared that the zero point response of this sensor becomes in slowly rising with the increase of natural law
Gesture, it was demonstrated that the zero point of this sensor occurs in that drift situation upwards in the experimental period of seven days.
Specific embodiment two:
Device is started working, and controls key-press module, is opened by the first electromagnetic valve 12, and the second electromagnetic valve 16 closes, and manually grasps
The H that concentration is 5.1ppm that control micro air pump 17 will configure2S gas is from sample gas air inlet pipe 11 suction built-in testing unit
The air chamber 13 (described air chamber 13 is tubular structure, and test cell 2 integral installation is in the path of air chamber 13) of 2, test cell 2
In the TGS2602 type metal oxide sensor that is arranged on metal oxide sensor socket can produce corresponding voltage letter
Number, voltage signal is amplified process via pre-amplification circuit 22, signal conditioning circuit 23 is filtered processing, and then passes through
Capture card 4 finally transmits to host computer 5 to be drawn voltage change curve figure and preserves.Information processing complete after the miniature gas of manual control
Waste gas is discharged to the outside environment by exhaustor 18 by pump 17.Then electromagnetic valve 12 closes, and electromagnetic valve 16 is opened, and cleaning nitrogen is from clearly
Clean gas inlet pipe 15 enters and is built-in with the air chamber 13 of sensor array 21, last manual control micro air pump 17 by waste gas by arranging
Trachea 18 is discharged to the outside environment, completes the cleaning of whole device.Above-mentioned experimentation repeats three times, Fig. 5 .1, figure
5.2, Fig. 5 .3 is respectively three experimental data waveforms that the same TGS2602 of being test for metal oxide sensor is collected,
The timeconstantτ of three times is respectively 3.6070,3.6326,3.9088.
Specific embodiment three:
Test the H with concentration as 5.1ppm when starting2S gas is calibrating gas, according to calibrating gas percentage is
5%, 10%, 20%, 40%, 60%, 80%, 100% it is mixed with the H of seven kinds of concentration with nitrogen2S gas, and press H2S gas
Concentration order from low to high is tested successively.Controlling key-press module, opened by the first electromagnetic valve 12, the second electromagnetic valve 16 closes
Closing, manual control micro air pump 17 is by the H of a certain concentration2S gas is from sample gas air inlet pipe 11 suction built-in testing unit 2
Air chamber 13, the TSG2602 type metal oxide sensor meeting being arranged on metal oxide sensor socket in test cell 2
Producing corresponding voltage signal, voltage signal is amplified process via pre-amplification circuit 22, signal conditioning circuit 23 is carried out
Filtering Processing, is then finally transmitted to host computer 5 by capture card 4 and draws voltage change curve figure and preserve.Information processing is complete
After one-tenth, waste gas is discharged to the outside environment by exhaustor 18 by manual control micro air pump 17.Then electromagnetic valve 12 closes, electromagnetic valve
16 open, and cleaning nitrogen enters the air chamber 13 being built-in with sensor array 21, last manual control from cleaning gas inlet pipe 15
Waste gas is discharged to the outside environment by exhaustor 18 by micro air pump 17, completes the cleaning of whole device.Choose one tested
Its waveform voltage signal is analyzed by TGS2602 type metal oxide sensor, and variable concentrations correspondence response magnitude is made folding
Line chart also simulates response curve, and as shown in Figure 6, the straight line simulated represents tested sensor to variable concentrations hydrogen sulfide gas
Response sensitivity.
The final purpose of this device is to screen tested sensor, to being unsatisfactory for sensor according to above test data
The tested individuality of handbook regulation parameter is rejected, and individuality satisfactory to characteristic mates according to surveyed parameter, for outward
Enclose circuit design and foundation is provided.
Unaccomplished matter of the present invention is known technology.
Claims (5)
1. a multichannel polytypic sensor performance test system, is characterized by that the composition of this system includes gas path module, survey
Examination unit, key-press module, capture card and host computer；
The composition of described gas path module includes air chamber, micro air pump, air inlet pipe, air inlet pipe, escape pipe, electromagnetic valve and electromagnetic valve；
Wherein, the path that described air inlet pipe, air inlet pipe merge into is connected with the air inlet of air chamber；Escape pipe is given vent to anger through air pump and air chamber
Mouth is connected；Electromagnetic valve and electromagnetic valve it is respectively arranged with in air inlet pipe, air inlet pipe；Electromagnetic valve and electromagnetic valve respectively with key-press module phase
Even；
Described test cell is arranged in air chamber, and its composition includes eight passages that power supply circuits are identical with composition, each passage
Composition includes sensor array, pre-amplification circuit and signal conditioning circuit；Its annexation is: power supply circuits are respectively with each
The sensor array of passage, pre-amplification circuit are connected；Sensor array, pre-amplification circuit and signal condition in each passage
Circuit is sequentially connected；The signal conditioning circuit of each passage is connected with capture card respectively, and capture card is connected with host computer.
2. multichannel polytypic sensor performance test system as claimed in claim 1, is characterized by described power supply circuits
Composition includes that the Switching Power Supply of 12V, three terminal regulator, forward low dropout voltage regulator and negative voltage produce chip, wherein, 12V's
Switching Power Supply is connected with three terminal regulator, and three terminal regulator produces chip with forward low dropout voltage regulator, negative voltage respectively and is connected.
3. multichannel polytypic sensor performance test system as claimed in claim 1, is characterized by described sensor array
Composition include photoionization gas sensor socket and metal oxide sensor socket, the two is connected by wire jumper；Light from
Sub-activating QI body sensor socket is connected with three terminal regulator, and metal oxide sensor socket is with forward low dropout voltage regulator even
Connect.
4. multichannel polytypic sensor performance test system as claimed in claim 1, is characterized by described preposition amplification electricity
Road composition includes chopper-zero-stabilized amplification chip；Three terminal regulator, negative voltage produce chip, photoionization gas sensor socket,
Metal oxide sensor socket is the most connected.
5. multichannel polytypic sensor performance test system as claimed in claim 1, is characterized by described signal condition electricity
Road composition includes a resistance, an electric capacity and a Zener diode, and wherein resistance one terminates chopper-zero-stabilized amplification chip, electricity
The resistance other end and capacitances in series, electric capacity other end ground connection, electric capacity is in parallel with Zener diode, Zener diode positive ending grounding, negative
End is connected with capture card.
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