CN110243915A - Electrochemical sensor automatic identification and ineffectiveness detection system and its detection method - Google Patents
Electrochemical sensor automatic identification and ineffectiveness detection system and its detection method Download PDFInfo
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- CN110243915A CN110243915A CN201910538467.4A CN201910538467A CN110243915A CN 110243915 A CN110243915 A CN 110243915A CN 201910538467 A CN201910538467 A CN 201910538467A CN 110243915 A CN110243915 A CN 110243915A
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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
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/4163—Systems checking the operation of, or calibrating, the measuring apparatus
Abstract
The invention discloses electrochemical sensor automatic identifications and ineffectiveness detection system and its detection method, detection system includes single-chip microcontroller, liquid crystal manipulation screen, memory, power supply, A/D converter circuit and electrochemical sensor automatic identification and ineffectiveness detection circuit, the single-chip microcontroller is connect with liquid crystal manipulation screen, the memory, power supply, A/D converter circuit and electrochemical sensor automatic identification and ineffectiveness detection circuit respectively, and the A/D converter circuit is connect with the electrochemical sensor automatic identification and ineffectiveness detection circuit.The ineffectiveness detection method of electrochemical sensor carries out the ineffectiveness detection of electrochemical sensor using above-mentioned electrochemical sensor automatic identification and ineffectiveness detection system.The configuration of the present invention is simple, design is scientific and reasonable, easy to use, quickly, efficiently, precisely can detect whether electrochemical sensor fails.
Description
Technical field
The present invention relates to electrochemical sensor automatic identifications and ineffectiveness detection system and its detection method.
Background technique
Electrochemical sensor may be used on all trades and professions gas detection.Since electrochemical sensor validity period is 2-3, together
When in use sample gas concentration will lead to test result beyond the characteristics such as electrochemical sensor failure after device measuring range
Inaccuracy.
Therefore, a electrochemical sensor automatic identification and ineffectiveness detection system and its detection method are designed, to fast
Speed, efficiently, precisely whether detection electrochemical sensor fails, and becomes skilled artisan's technology urgently to be resolved and asks
Topic.
Summary of the invention
The technical problem to be solved by the present invention is provide electrochemical sensor automatic identification and ineffectiveness detection system and its
Detection method quickly, efficiently, precisely can detect whether electrochemical sensor fails.
To achieve the above object, The technical solution adopted by the invention is as follows:
Electrochemical sensor automatic identification and ineffectiveness detection system, including single-chip microcontroller, liquid crystal manipulate screen, memory, electricity
Source, A/D converter circuit and electrochemical sensor automatic identification and ineffectiveness detection circuit, the single-chip microcontroller respectively with the liquid
Crystalline substance manipulation screen, the memory, power supply, A/D converter circuit and electrochemical sensor automatic identification and ineffectiveness detection circuit
Connection, the A/D converter circuit are connect with the electrochemical sensor automatic identification and ineffectiveness detection circuit.
Further, the electrochemical sensor automatic identification and ineffectiveness detection circuit include set CE pin incoming end,
The electrochemical sensor access interface of RE pin incoming end and WE pin incoming end may be programmed adjustable resistance U1, metal-oxide-semiconductor Q1, electricity
R1, resistance R2, resistance R3, resistance R4, resistance R5, capacitor C1, capacitor C2, capacitor C3, capacitor C5, amplifier OP1 are hindered, it is automatic to increase
Beneficial adjustment circuit and autobias generation circuit, the CE incoming end, the RE incoming end and the WE incoming end are used respectively
In CE pin, RE pin and the WE pin of access electrochemical sensor；
The output end of the CE pin incoming end, the resistance R1 and the amplifier OP1 is sequentially connected in series, the RE
Pin incoming end, the resistance R2, the resistance R3 and the amplifier OP1 noninverting input be sequentially connected in series, the WE
Pin incoming end, the programmable adjustable resistance U1, the automatic gain adjustment circuit, the resistance R4, the resistance R5, with
And the reverse input end of the amplifier OP1 is sequentially connected in series；
The both ends of the capacitor C1 are connect with the CE pin incoming end and the RE pin incoming end respectively, the capacitor
The both ends of C3 are connect with the output end of the noninverting input of the amplifier OP1 and the amplifier OP1 respectively；The capacitor C5
One end connect with the programmable adjustable resistance U1, the other end ground connection；One end of the capacitor C2 is connected to the resistance
Between R2 and the resistance R3, the other end is connected between the resistance R1 and the output end of the amplifier OP1；
The autobias generation circuit is connect with the reverse input end of the amplifier OP1, and the autobias generates
Circuit is also grounded, and the drain D of the metal-oxide-semiconductor Q1 is connect with the WE pin incoming end, the source S of the metal-oxide-semiconductor Q1 with it is described
The connection of RE pin incoming end, the grid G of the metal-oxide-semiconductor Q1 and the autobias generation circuit respectively with the single-chip microcontroller one
A pin connection, a pin of the single-chip microcontroller are connected between the resistance R4 and the resistance R5, the automatic gain
Adjustment circuit is connect by the A/D converter circuit with the single-chip microcontroller.
Further, the automatic gain adjustment circuit include amplifier OP2, programmable adjustable resistance U3, it is programmable can
Adjust resistance U4, programmable adjustable resistance U5 and capacitor C6, the reverse input end of the amplifier OP2, it is described may be programmed it is adjustable
Resistance U3, the programmable adjustable resistance U4, the programmable adjustable resistance U5 and the amplifier OP2 output end according to
Secondary concatenation, the both ends of the capacitor C6 output end with the reverse input end of the amplifier OP2 and the amplifier OP2 respectively
Connection, the reverse input end of the amplifier OP2 are connect with the programmable adjustable resistance U1, and the amplifier OP2's is in the same direction
Input terminal is connect with the resistance R4, and the output end of the amplifier OP2 is connected by the A/D converter circuit and the single-chip microcontroller
It connects.
Further, the autobias generation circuit include metal-oxide-semiconductor Q2, programmable adjustable resistance U2, may be programmed it is adjustable
Resistance U6 and capacitor C4, the drain D of the metal-oxide-semiconductor Q2, the programmable adjustable resistance U6, described are compiled the capacitor C4
The source S of journey adjustable resistance U2 and the metal-oxide-semiconductor Q2 are sequentially connected in series, the drain D of the metal-oxide-semiconductor Q2 and the amplifier OP1
Reverse input end connection, the grid G of the metal-oxide-semiconductor Q2 connect with a pin of the single-chip microcontroller, the capacitor C4 and institute
State programmable adjustable resistance U6 indirectly.
Further, the programmable adjustable resistance U1 is X9C102 programmable resistance, and resistance value adjustable extent is 0-
1K Ω, the programmable adjustable resistance U2, it the programmable adjustable resistance U3, the programmable adjustable resistance U4, described compiles
The journey adjustable resistance U5 and programmable adjustable resistance U6 is X9C104 programmable resistance, and resistance value adjustable extent is
0-100KΩ。
Further, the resistance value of the resistance R1 is 1K Ω, and the resistance value of the resistance R2 is 10K Ω, the resistance
The resistance value of R3 is 10K Ω, and the resistance value of the resistance R4 is 47.5K Ω, and the resistance value of the resistance R5 is 27.4K Ω.
Further, the capacitor C1 is 10nf capacitor, and the capacitor C2 is 10nf capacitor, and the capacitor C3 is 10nf electricity
Hold, the capacitor C4 is 10nf capacitor, and the capacitor C5 is 100nf capacitor.
The ineffectiveness detection method of electrochemical sensor, using above-mentioned electrochemical sensor automatic identification and ineffectiveness detection system
System carries out the ineffectiveness detection of electrochemical sensor.
Further, comprising the following steps:
Electrochemical sensor to be detected is accessed electrochemical sensor automatic identification and ineffectiveness detection system simultaneously by step 1
Start the electrochemical sensor automatic identification and ineffectiveness detection system；
Step 2, initialization electrochemical sensor automatic identification and ineffectiveness detection system；
After the completion of step 3, initialization, changes the parameter of electrochemical sensor automatic identification and ineffectiveness detection circuit, make
The bias of electrochemical sensor to be detected generates disturbance；
Whether the output voltage of step 4, detection electrochemical sensor automatic identification and ineffectiveness detection circuit is with to be detected
Electrochemical sensor bias disturbs and changes, if output voltage perturbation amplitude is big, electrochemical sensor to be detected is normal, if defeated
Voltage disturbance amplitude is small out or does not disturb, then electrochemical sensor failure to be detected.
Further, the bias range of disturbance of electrochemical sensor to be detected is ± 1mv.
Compared with prior art, the invention has the following advantages:
The configuration of the present invention is simple, design is scientific and reasonable, easy to use, can quickly, efficiently, precisely detect electrochemical sensing
Whether device fails.
The present invention is defeated to electrochemical sensor to be detected by electrochemical sensor automatic identification and ineffectiveness detection system
Enter the bias an of ± 1mv, single-chip microcontroller passes through A/D converter circuit and electrochemical sensor automatic identification and ineffectiveness detection circuit
Voltage output end connection, with this come monitor electrochemical sensor automatic identification and ineffectiveness detection circuit Vout change feelings
Condition, when Vout can change, and input correct bias, electrochemical sensor automatic identification and the output of ineffectiveness detection circuit
Voltage Vout restores normal.Thus it can determine whether that sensor is normal.
If input ± 1mv bias electrochemical sensor automatic identification and ineffectiveness detection circuit voltage output Vout are without change
Change, then tentatively judges that electrochemical sensor is faulty.Bias is changed to right value input, electrochemical sensor automatic identification and mistake
Effect property detection circuit then can determine whether that the determination of this electrochemical sensor is bad, testing result is quick, efficient, smart still without normally output
It is quasi-.
Detailed description of the invention
Fig. 1 is the system block diagram of electrochemical sensor automatic identification and ineffectiveness detection system of the present invention.
Fig. 2 is the driving principle figure of electrochemical sensor automatic identification of the present invention and ineffectiveness detection circuit.
Specific embodiment
The invention will be further described with embodiment for explanation with reference to the accompanying drawing, and mode of the invention includes but not only limits
In following embodiment.
As illustrated in fig. 1 and 2, electrochemical sensor automatic identification provided by the invention and ineffectiveness detection system, structure letter
List, design is scientific and reasonable, easy to use, quickly, efficiently, precisely can detect whether electrochemical sensor fails.Including monolithic
Machine, liquid crystal manipulation screen, memory, power supply, A/D converter circuit and electrochemical sensor automatic identification and ineffectiveness detection electricity
Road, the single-chip microcontroller manipulate screen, the memory, power supply, A/D converter circuit and electrochemical sensor with the liquid crystal respectively
Automatic identification is connected with ineffectiveness detection circuit, the A/D converter circuit and the electrochemical sensor automatic identification and ineffectiveness
Detection circuit connection, the memory are any one in SD card, TF card, E2PROM and RAM.
Electrochemical sensor automatic identification of the present invention and ineffectiveness detection circuit include set CE pin incoming end, RE draws
The electrochemical sensor access interface of foot incoming end and WE pin incoming end may be programmed adjustable resistance U1, metal-oxide-semiconductor Q1, resistance R1,
Resistance R2, resistance R3, resistance R4, resistance R5, capacitor C1, capacitor C2, capacitor C3, capacitor C5, amplifier OP1, automatic gain tune
Whole circuit and autobias generation circuit, the CE incoming end, the RE incoming end and the WE incoming end are respectively used to connect
Enter the CE pin, RE pin and WE pin of electrochemical sensor；It the CE pin incoming end, the resistance R1 and described puts
The output end of big device OP1 is sequentially connected in series, the RE pin incoming end, the resistance R2, the resistance R3 and the amplifier
The noninverting input of OP1 is sequentially connected in series, the WE pin incoming end, the programmable adjustable resistance U1, the automatic gain tune
Whole circuit, the resistance R4, the resistance R5 and the amplifier OP1 reverse input end be sequentially connected in series.
The both ends of capacitor C1 of the present invention are connect with the CE pin incoming end and the RE pin incoming end respectively, institute
The both ends for stating capacitor C3 are connect with the output end of the noninverting input of the amplifier OP1 and the amplifier OP1 respectively；It is described
One end of capacitor C5 is connect with the programmable adjustable resistance U1, other end ground connection；One end of the capacitor C2 is connected to institute
It states between resistance R2 and the resistance R3, the other end is connected between the resistance R1 and the output end of the amplifier OP1；
The autobias generation circuit is connect with the reverse input end of the amplifier OP1, and the autobias generation circuit also connects
Ground, the drain D of the metal-oxide-semiconductor Q1 are connect with the WE pin incoming end, and the source S of the metal-oxide-semiconductor Q1 connects with the RE pin
Enter end connection, the grid G of the metal-oxide-semiconductor Q1 and the autobias generation circuit connect with a pin of the single-chip microcontroller respectively
It connects, a pin of the single-chip microcontroller is connected between the resistance R4 and the resistance R5, the automatic gain adjustment circuit
It is connect by the A/D converter circuit with the single-chip microcontroller.
Automatic gain adjustment circuit of the present invention includes amplifier OP2, programmable adjustable resistance U3, programmable adjustable electric
Hinder U4, programmable adjustable resistance U5 and capacitor C6, the reverse input end of the amplifier OP2, the programmable adjustable resistance
U3, the programmable adjustable resistance U4, the programmable adjustable resistance U5 and the amplifier OP2 output end successively go here and there
It connects, the both ends of the capacitor C6 connect with the output end of the reverse input end of the amplifier OP2 and the amplifier OP2 respectively
It connects, the reverse input end of the amplifier OP2 is connect with the programmable adjustable resistance U1, and the amplifier OP2's is in the same direction defeated
Enter end to connect with the resistance R4, the output end of the amplifier OP2 is connect by the A/D converter circuit with the single-chip microcontroller.
Autobias generation circuit of the present invention includes metal-oxide-semiconductor Q2, programmable adjustable resistance U2, programmable adjustable resistance
U6 and capacitor C4, the drain D of the metal-oxide-semiconductor Q2, the capacitor C4, the programmable adjustable resistance U6, it is described it is programmable can
The source S of the resistance U2 and metal-oxide-semiconductor Q2 is adjusted to be sequentially connected in series, the drain D of the metal-oxide-semiconductor Q2 is anti-with the amplifier OP1's
Connected to input terminal, the grid G of the metal-oxide-semiconductor Q2 connect with a pin of the single-chip microcontroller, the capacitor C4 and it is described can
Program adjustable resistance U6 indirectly.
Programmable adjustable resistance U1 of the present invention is X9C102 programmable resistance, and resistance value adjustable extent is 0-1K
It is Ω, the programmable adjustable resistance U2, the programmable adjustable resistance U3, the programmable adjustable resistance U4, described programmable
The adjustable resistance U5 and programmable adjustable resistance U6 is X9C104 programmable resistance, and resistance value adjustable extent is 0-
100KΩ.The resistance value of the resistance R1 is 1K Ω, and the resistance value of the resistance R2 is 10K Ω, the resistance value of the resistance R3
For 10K Ω, the resistance value of the resistance R4 is 47.5K Ω, and the resistance value of the resistance R5 is 27.4K Ω.The capacitor C1 is
10nf capacitor, the capacitor C2 are 10nf capacitor, and the capacitor C3 is 10nf capacitor, and the capacitor C4 is 10nf capacitor, described
Capacitor C5 is 100nf capacitor.
The present invention may be programmed adjustable resistance U1-6 and be all made of X9Cxxx series of programmable adjustable resistance, can pass through single-chip microcontroller
To adjust the specific resistance value of resistance.
The present invention may be programmed adjustable resistance U1 and use X9C102, can produce the resistance value of 0~1K, is able to satisfy all electrochemistry
The needs of sensor load resistance, so, the circuit fits all electrochemical sensor in the market, when different brands electrification
After learning sensor insertion circuit, single-chip microcontroller can be adjusted load resistance according to the parameter of different electrochemical sensors.
Programmable adjustable resistance U3 in automatic gain adjustment circuit of the present invention U4 U5 may be programmed using X9C104 it is adjustable
Resistance is connected, and single-chip microcontroller can be automatically adjusted three resistance, according to system needs to reach automatic gain tune
Whole purpose, such system can lead to SEN_ according to response as a result, carry out adjust gain, when current output sensor is smaller
VOUT_OP output it is too small and when being unable to measure, single-chip microcontroller can allow gain to become larger with the value of appropriate adjustment U3 U4 U5；Work as sensing
It is larger that device exports electric current, leads to that SEN_VOUT_OP output is too big and no to scale, single-chip microcontroller can be with appropriate adjustment U3 U4 U5's
Value, allows gain to become smaller, to match the measuring range of rear class AD circuit；
Autobias generation circuit of the present invention reaches sensor detection function or certain sensings when needing to generate bias
When device itself needs to generate bias, single-chip microcontroller can allow bias circuit U2/U6 to produce by dragging down the BIAS_SWITCH pin of Q2
The raw bias needed, U2 U6 adjustable resistance may be programmed using X9C104 connect, single-chip microcontroller can be right according to system needs
Two resistance are automatically adjusted, to achieve the purpose that bias adjusts.
The ineffectiveness detection method of electrochemical sensor, using above-mentioned electrochemical sensor automatic identification and ineffectiveness detection system
System carries out the ineffectiveness detection of electrochemical sensor.The following steps are included:
Electrochemical sensor to be detected is accessed electrochemical sensor automatic identification and ineffectiveness detection system simultaneously by step 1
Start the electrochemical sensor automatic identification and ineffectiveness detection system；
Step 2, initialization electrochemical sensor automatic identification and ineffectiveness detection system；
After the completion of step 3, initialization, changes the parameter of electrochemical sensor automatic identification and ineffectiveness detection circuit, make
The disturbance of the bias generation ± 1mv of electrochemical sensor to be detected；
Whether the output voltage of step 4, detection electrochemical sensor automatic identification and ineffectiveness detection circuit is with to be detected
Electrochemical sensor bias disturbs and changes, if output voltage perturbation amplitude is big, electrochemical sensor to be detected is normal, if defeated
Voltage disturbance amplitude is small out or does not disturb, then electrochemical sensor failure to be detected.
The present invention is defeated to electrochemical sensor to be detected by electrochemical sensor automatic identification and ineffectiveness detection system
Enter the bias an of ± 1mv, single-chip microcontroller passes through A/D converter circuit and electrochemical sensor automatic identification and ineffectiveness detection circuit
Voltage output end connection, with this come monitor electrochemical sensor automatic identification and ineffectiveness detection circuit Vout change feelings
Condition, when Vout can change, and input correct bias, electrochemical sensor automatic identification and the output of ineffectiveness detection circuit
Voltage Vout restores normal.Thus it can determine whether that sensor is normal.
If input ± 1mv bias electrochemical sensor automatic identification and ineffectiveness detection circuit voltage output Vout are without change
Change, then tentatively judges that electrochemical sensor is faulty.Bias is changed to right value input, electrochemical sensor automatic identification and mistake
Effect property detection circuit then can determine whether that the determination of this electrochemical sensor is bad, testing result is quick, efficient, smart still without normally output
It is quasi-.
Electrochemical sensor automatic identification of the present invention and ineffectiveness detection system also have automatic identification electrochemical sensor
Function, specific identification process are as follows:
Step 1, the official information for being stored in fire power chemical sensor in memory, and establish electrochemical sensor number
According to library；
Step 2 passes through manual testing's electrochemical sensor to be identified, measures electrochemical sensor to be identified in real system
In unloaded output valve and power up in curve of output characteristic value, and by measured unloaded output valve and characteristic value
Typing memory；
Electrochemical sensor to be identified is accessed electrochemical sensor automatic identification and ineffectiveness detection circuit by step 3, and
It is powered on to single-chip microcontroller, single-chip microcontroller reads the unloaded output valve and characteristic value of electrochemical sensor to be identified from memory；
Step 4, single-chip microcontroller respectively pass electrochemistry according to the unloaded output valve and characteristic value of electrochemical sensor to be identified
Sensor automatic identification and ineffectiveness detection circuit are correctly configured；
Step 5, single-chip microcontroller are passed by electrochemical sensor automatic identification and ineffectiveness detection circuit to electrochemistry to be identified
Sensor powers on, and by A/D converter circuit, monitors voltage value of the electrochemical sensor power up to be identified in each period, together
When the voltage value monitored is matched with the electrochemical sensor in memory in electrochemical sensor database, thus
Automatic identification is carried out to electrochemical sensor to be identified.
The present invention also needs to carry out electrochemical sensor identification, with true before carrying out ineffectiveness detection to electrochemical sensor
Determine the type of electrochemical sensor, above-mentioned recognition methods can be used, so carrying out the ineffectiveness inspection of electrochemical sensor progress
It, could be according to different types of electrochemical sensor, in electrochemical sensor automatic identification and ineffectiveness detection circuit when survey
Load resistance, gain resistor and bias configured, it is determined that load resistor value, after gain resistor value and bias value, electrification
It learns sensor automatic identification and ineffectiveness detection circuit output voltage values has determined, while also determining to some specific electricity
Chemical sensor carries out ineffectiveness test.Single-chip microcontroller reads electrochemical sensor automatic identification after automatically entering bias value ± 1mv
With ineffectiveness detection circuit output voltage, output voltage is recorded if voltage changes and judges sensor energy normal use.
Judge to sense if input bias value ± 1mv electrochemical sensor automatic identification and ineffectiveness detection circuit output voltage are unchanged
Device failure.Single-chip microcontroller exports final detection result and manipulates screen display in liquid crystal.
The present invention can accurate judgement electrochemical sensor whether can work normally, to avoid electrochemical sensor to gas
Because wrong conclusion occurs in the factor of sensor itself when body is detected.
Above-described embodiment is only one of the preferred embodiment of the present invention, should not be taken to limit protection model of the invention
It encloses, as long as that in body design thought of the invention and mentally makes has no the change of essential meaning or polishing, is solved
The technical issues of it is still consistent with the present invention, should all be included within protection scope of the present invention.
Claims (10)
1. electrochemical sensor automatic identification and ineffectiveness detection system, which is characterized in that shield including single-chip microcontroller, liquid crystal manipulation,
Memory, power supply, A/D converter circuit and electrochemical sensor automatic identification and ineffectiveness detection circuit, the single-chip microcontroller point
Screen, the memory, power supply, A/D converter circuit and electrochemical sensor automatic identification and failure are not manipulated with the liquid crystal
Property detection circuit connection, the A/D converter circuit connect with the electrochemical sensor automatic identification and ineffectiveness detection circuit.
2. electrochemical sensor automatic identification according to claim 1 and ineffectiveness detection system, which is characterized in that described
Electrochemical sensor automatic identification and ineffectiveness detection circuit include setting CE pin incoming end, RE pin incoming end and WE pin to connect
Enter the electrochemical sensor access interface at end, may be programmed adjustable resistance U1, metal-oxide-semiconductor Q1, resistance R1, resistance R2, resistance R3, resistance
R4, resistance R5, capacitor C1, capacitor C2, capacitor C3, capacitor C5, amplifier OP1, automatic gain adjustment circuit and autobias
Generation circuit, the CE incoming end, the RE incoming end and the WE incoming end are respectively used to the CE of access electrochemical sensor
Pin, RE pin and WE pin；
The output end of the CE pin incoming end, the resistance R1 and the amplifier OP1 is sequentially connected in series, the RE pin
Incoming end, the resistance R2, the resistance R3 and the amplifier OP1 noninverting input be sequentially connected in series, the WE pin
Incoming end, the programmable adjustable resistance U1, the automatic gain adjustment circuit, the resistance R4, described resistance R5, Yi Jisuo
The reverse input end for stating amplifier OP1 is sequentially connected in series；
The both ends of the capacitor C1 are connect with the CE pin incoming end and the RE pin incoming end respectively, the capacitor C3's
Both ends are connect with the output end of the noninverting input of the amplifier OP1 and the amplifier OP1 respectively；The one of the capacitor C5
End is connect with the programmable adjustable resistance U1, other end ground connection；One end of the capacitor C2 be connected to the resistance R2 and
Between the resistance R3, the other end is connected between the resistance R1 and the output end of the amplifier OP1；
The autobias generation circuit is connect with the reverse input end of the amplifier OP1, the autobias generation circuit
It is also grounded, the drain D of the metal-oxide-semiconductor Q1 is connect with the WE pin incoming end, and source S and the RE of the metal-oxide-semiconductor Q1 draws
The connection of foot incoming end, the grid G of the metal-oxide-semiconductor Q1 and the autobias generation circuit draw with one of the single-chip microcontroller respectively
Foot connection, a pin of the single-chip microcontroller are connected between the resistance R4 and the resistance R5, the automatic gain adjustment
Circuit is connect by the A/D converter circuit with the single-chip microcontroller.
3. electrochemical sensor automatic identification according to claim 2 and ineffectiveness detection system, which is characterized in that described
Automatic gain adjustment circuit includes amplifier OP2, programmable adjustable resistance U3, programmable adjustable resistance U4, programmable adjustable electric
Hinder U5 and capacitor C6, the reverse input end of the amplifier OP2, the programmable adjustable resistance U3, it is described may be programmed it is adjustable
The output end of resistance U4, the programmable adjustable resistance U5 and the amplifier OP2 are sequentially connected in series, and the two of the capacitor C6
End is connect with the output end of the reverse input end of the amplifier OP2 and the amplifier OP2 respectively, the amplifier OP2's
Reverse input end is connect with the programmable adjustable resistance U1, and the noninverting input of the amplifier OP2 and the resistance R4 connect
It connects, the output end of the amplifier OP2 is connect by the A/D converter circuit with the single-chip microcontroller.
4. electrochemical sensor automatic identification according to claim 3 and ineffectiveness detection system, which is characterized in that described
Autobias generation circuit includes metal-oxide-semiconductor Q2, programmable adjustable resistance U2, programmable adjustable resistance U6 and capacitor C4, described
The drain D of metal-oxide-semiconductor Q2, the capacitor C4, the programmable adjustable resistance U6, the programmable adjustable resistance U2 and described
The source S of metal-oxide-semiconductor Q2 is sequentially connected in series, and the drain D of the metal-oxide-semiconductor Q2 is connect with the reverse input end of the amplifier OP1, described
The grid G of metal-oxide-semiconductor Q2 is connect with a pin of the single-chip microcontroller, between the capacitor C4 and the programmable adjustable resistance U6
Ground connection.
5. electrochemical sensor automatic identification according to claim 4 and ineffectiveness detection system, which is characterized in that described
Programmable adjustable resistance U1 is X9C102 programmable resistance, and resistance value adjustable extent is 0-1K Ω, the programmable adjustable electric
Hinder U2, the programmable adjustable resistance U3, the programmable adjustable resistance U4, the programmable adjustable resistance U5 and described
Programmable adjustable resistance U6 is X9C104 programmable resistance, and resistance value adjustable extent is 0-100K Ω.
6. electrochemical sensor automatic identification according to claim 5 and ineffectiveness detection system, which is characterized in that described
The resistance value of resistance R1 is 1K Ω, and the resistance value of the resistance R2 is 10K Ω, and the resistance value of the resistance R3 is 10K Ω, described
The resistance value of resistance R4 is 47.5K Ω, and the resistance value of the resistance R5 is 27.4K Ω.
7. electrochemical sensor automatic identification according to claim 6 and ineffectiveness detection system, which is characterized in that described
Capacitor C1 is 10nf capacitor, and the capacitor C2 is 10nf capacitor, and the capacitor C3 is 10nf capacitor, and the capacitor C4 is 10nf electricity
Hold, the capacitor C5 is 100nf capacitor.
8. the ineffectiveness detection method of electrochemical sensor, which is characterized in that certainly using electrochemical sensor described in claim 1-7
Dynamic identification and ineffectiveness detection system carry out the ineffectiveness detection of electrochemical sensor.
9. the ineffectiveness detection method of electrochemical sensor according to claim 8, which comprises the following steps:
Electrochemical sensor to be detected is accessed electrochemical sensor automatic identification and ineffectiveness detection system and started by step 1
The electrochemical sensor automatic identification and ineffectiveness detection system；
Step 2, initialization electrochemical sensor automatic identification and ineffectiveness detection system；
After the completion of step 3, initialization, changes the parameter of electrochemical sensor automatic identification and ineffectiveness detection circuit, make to be checked
The bias for surveying electrochemical sensor generates disturbance；
Whether the output voltage of step 4, detection electrochemical sensor automatic identification and ineffectiveness detection circuit is with electrification to be detected
It learns the disturbance of sensor bias and changes, if output voltage perturbation amplitude is big, electrochemical sensor to be detected is normal, if output electricity
Pressure perturbation amplitude is small or does not disturb, then electrochemical sensor failure to be detected.
10. the ineffectiveness detection method of electrochemical sensor according to claim 9, which is characterized in that in the step 3
In, the bias range of disturbance of electrochemical sensor to be detected is ± 1mv.
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