CN109342660A - SCM Based gas sensor array output detection system and detection method - Google Patents
SCM Based gas sensor array output detection system and detection method Download PDFInfo
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- CN109342660A CN109342660A CN201811316969.4A CN201811316969A CN109342660A CN 109342660 A CN109342660 A CN 109342660A CN 201811316969 A CN201811316969 A CN 201811316969A CN 109342660 A CN109342660 A CN 109342660A
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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
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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Abstract
The disclosure discloses a kind of SCM Based gas sensor array output detection system, comprising: artificial circuit part and digital circuits section；Wherein, the artificial circuit part includes power module, measuring resistance division module, signal filter module, single-ended transfer difference module and analog-to-digital conversion module；The digital circuits section includes single-chip microcontroller, communication module and display module.The disclosure further discloses a kind of SCM Based gas sensor array output detecting method, can the output of detecting line sensor array improve detection resolution, and real-time display testing result.
Description
Technical field
The disclosure belongs to gas sensor output signal detection field, and in particular to a kind of SCM Based gas sensing
Device array output detection system and detection method.
Background technique
In power industry, GIS due to its occupied area is small, high reliablity and be widely applied.Due to its enclosed construction,
The initial failure of GIS is difficult to find.SF in the gas sensor detection GIS device haveing excellent performance is generallyd use at present6Gas point
Solve product such as H2S、SO2Fault diagnosis and status assessment are carried out Deng to equipment.The output quantity of precise measurement gas sensor is for just
Really judge SF6Gas decomposition product component is most important.The electric signal of gas sensor output is very faint, and commercial telecommunication number is surveyed
It is high to measure system cost, volume is larger, needs to connect the judgement that host computer realizes gas component, is not suitable for on-line monitoring system.
Common electric resistance measuring apparatus then has the shortcomings that precision is low, noise jamming is big, and the output of sensor can be submerged in noise, measurement
Error is larger, seriously affects the judgement of gas component.Therefore, the SF in gas sensor monitors GIS6The application of decomposition product
In, it is necessary to develop a kind of high-precision gas sensor array output detection system.
Summary of the invention
In view of the deficiency of the prior art, the disclosure is designed to provide a kind of SCM Based gas sensing
Device array output detection system and method are capable of the output of detecting line sensor array, and real-time display testing result, are had
The advantage that detection efficiency is high, error is small.
The disclosure is achieved through the following technical solutions above-mentioned purpose:
A kind of SCM Based gas sensor array output detection system, comprising: artificial circuit part and number electricity
Road part；Wherein,
The artificial circuit part includes:
Power module, for powering for the detection system；
Measuring resistance division module, for sensor array output signal to be converted to the single-ended analog voltage for being easy to measure
Signal；
Signal filter module, for filtering out the high-frequency interferencing signal in the single-ended analog voltage signal；
Single-ended transfer difference module, for the single-ended analog voltage signal to be converted to difference analogue voltage signal；
Analog-to-digital conversion module, for the difference analogue voltage signal to be converted to digital signal；
The digital circuits section includes:
Single-chip microcontroller, for according to the digital signal detecting line sensor array in the read analog-to-digital conversion module
Output and output test result；
Communication module is used for transmission the testing result of the single-chip microcontroller；
Display module, the testing result for single-chip microcontroller described in real-time display；
Preferably, the power module includes Switching Power Supply, voltage stabilizing chip and several capacitors.
Preferably, the measuring resistance division module includes reference voltage source, gas sensor output end interface and precision
Resistance.
Preferably, the signal filter module includes operational amplifier, several capacitors and several resistance.
Preferably, the single-ended transfer difference module includes common-mode voltage source, several operational amplifiers and several resistance.
Preferably, the analog-to-digital conversion module includes reference voltage source and N channel analog-digital converter.
The disclosure also provides a kind of SCM Based gas sensor array output detecting method, includes the following steps:
S100: it obtains the output signal of sensor array and is converted to the single-ended analog voltage signal for being easy to measure；
S200: the high-frequency interferencing signal in the single-ended analog voltage signal is filtered out；
S300: the single-ended analog voltage signal after high-frequency interferencing signal will be filtered out and be converted to difference analogue voltage signal；
S400: the difference analogue voltage signal is converted into digital signal；
S500: on-line checking and real-time display testing result are carried out to digital signal.
Preferably, the output signal of the sensor array is to change slow resistance signal.
Compared with prior art, disclosure bring has the beneficial effect that
1, it can effectively inhibit high-frequency signal interference and common mode interference, improve detection resolution；
2, it is capable of the output of detecting line sensor array and real-time display testing result.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of SCM Based gas sensor array output detection system of the invention；
Fig. 2 is the circuit block diagram of the measuring resistance division module in Fig. 1；
Fig. 3 is the circuit block diagram of the signal filter module in Fig. 1；
Fig. 4 is the circuit block diagram of the single-ended transfer difference module in Fig. 1；
Fig. 5 is the circuit block diagram of the N channel analog-digital converter in Fig. 1.
Specific embodiment
The technical solution of the disclosure is described in detail with reference to the accompanying drawings and examples.
Referring to Fig. 1, present disclose provides a kind of SCM Based gas sensor array output detection systems, comprising:
Artificial circuit part and digital circuits section；Wherein,
The artificial circuit part includes:
Power module, for powering for the detection system；
Measuring resistance division module, for sensor array output signal to be converted to the single-ended analog voltage for being easy to measure
Signal；
Signal filter module, for filtering out the high-frequency interferencing signal in the single-ended analog voltage signal；
Single-ended transfer difference module, for the single-ended analog voltage signal to be converted to difference analogue voltage signal；
Analog-to-digital conversion module, for the difference analogue voltage signal to be converted to digital signal；
The digital circuits section includes:
Single-chip microcontroller, for according to the digital signal detecting line sensor array in the read analog-to-digital conversion module
Output and output test result；
Communication module is used for transmission the testing result of the single-chip microcontroller；
Display module, the testing result for single-chip microcontroller described in real-time display.
So far, above-described embodiment completely discloses technical solution of the present invention.The present embodiment can read gas in real time
The output signal of sensor array simultaneously carries out on-line checking, can efficiently, accurately detect the output of sensor array and defeated
Expressed gas component out.
In another embodiment, the power module includes Switching Power Supply, voltage stabilizing chip and several capacitors.
In the present embodiment, Switching Power Supply provides the power supply of entire detection system, obtains after voltage stabilizing chip and meets each member
The operating voltage of requirement on devices, to guarantee that detection system each section works normally.
In another embodiment, referring to fig. 2, the measuring resistance division module includes reference voltage source, gas sensor
Export end interface and precision resistance.
In the present embodiment, the reference voltage source is connected with one end of gas sensor output end interface, steady for providing
Fixed reference voltage, it is ensured that reduce the fluctuation of voltage signal as far as possible；The other end of gas sensor output end interface with
One end of the precision resistance is connected, the other end ground connection of the precision resistance.
In another embodiment, referring to Fig. 3, the signal filter module includes operational amplifier, several capacitors and several
Resistance.
In the present embodiment, resistance R1One end is connect with measuring resistance bleeder circuit output end, the other end and resistance R2And capacitor
C1It is connected, resistance R2The other end and capacitor C2And operational amplifier A1Positive input terminal connection, capacitor C1The other end and operation
Amplifier A1Output end be connected, capacitor C2The other end ground connection, operational amplifier A1Negative input end be connected with output end, electricity
Hinder R3One end and operational amplifier A1Output end be connected, the other end and resistance R4With capacitor C3It is connected, resistance R4The other end
With capacitor C4And operational amplifier A2Positive input terminal connection, capacitor C3The other end and operational amplifier A2Output end be connected,
Capacitor C4The other end ground connection, operational amplifier A2Negative input end be connected with output end.It should be noted that in the present embodiment
Signal filter circuit be a quadravalence Butterworth filter, can effectively inhibit the interference of high-frequency signal.
In another embodiment, referring to fig. 4, the single-ended transfer difference module includes common-mode voltage source, several operation amplifiers
Device and several resistance.
In the present embodiment, operational amplifier A3Positive input terminal be connected with common-mode voltage source and negative input end, resistance R5One end
Meet signal filter circuit output end, the other end and operational amplifier A4Positive input terminal and resistance R8It is connected, resistance R8The other end
With operational amplifier A3Output end be connected, resistance R6One end and operational amplifier A4Negative input end and resistance R7It is connected, it is another
End ground connection, resistance R7The other end and operational amplifier A4Output end be connected.Single-ended analog voltage signal is converted to difference analogue
Voltage signal can effectively inhibit common mode interference, improve the resolution ratio of detection system.
In another embodiment, the analog-to-digital conversion module includes reference voltage source and N channel analog-digital converter.
In the present embodiment, reference voltage source provides reference voltage for N channel analog-digital converter.Referring to Fig. 5, N channel modulus
The differential input end of converter is connected with the output end of N number of single-ended transfer difference circuit respectively, the control of the N channel analog-digital converter
System and communications pins are connected with single-chip microcontroller, and the data in N channel analog-digital converter are transmitted to single-chip microcontroller by pin.
In another embodiment, the disclosure additionally provides a kind of SCM Based gas sensor array output detection side
Method includes the following steps:
S100: it obtains the output signal of sensor array and is converted to the single-ended analog voltage signal for being easy to measure；
S200: the high-frequency interferencing signal in the single-ended analog voltage signal is filtered out；
S300: the single-ended analog voltage signal after high-frequency interferencing signal will be filtered out and be converted to difference analogue voltage signal；
S400: the difference analogue voltage signal is converted into digital signal；
S500: on-line checking and real-time display testing result are carried out to digital signal.
In another embodiment, the output signal of the sensor array is to change slow resistance signal.
The foregoing is merely the preferred embodiment of the disclosure, it cannot be understood as the limitation to disclosure range,
It should be pointed out that those skilled in the art, under the premise of not departing from disclosure design, can also make several
Modification and improvement, these belong to the protection scope of the disclosure.
Claims (8)
1. a kind of SCM Based gas sensor array output detection system, comprising: artificial circuit part and digital circuit
Part；Wherein,
The artificial circuit part includes:
Power module, for powering for the detection system；
Measuring resistance division module, for sensor array output signal to be converted to the single-ended analog voltage for being easy to measure letter
Number；
Signal filter module, for filtering out the high-frequency interferencing signal in the single-ended analog voltage signal；
Single-ended transfer difference module, for the single-ended analog voltage signal to be converted to difference analogue voltage signal；
Analog-to-digital conversion module, for the difference analogue voltage signal to be converted to digital signal；
The digital circuits section includes:
Single-chip microcontroller, for according to the defeated of the digital signal detecting line sensor array in the read analog-to-digital conversion module
Out and output test result；
Transmission module is used for transmission the testing result of the single-chip microcontroller；
Display module, the testing result for single-chip microcontroller described in real-time display.
2. detection system according to claim 1, which is characterized in that it is preferred, the power module include Switching Power Supply,
Voltage stabilizing chip and several capacitors.
3. detection system according to claim 1, which is characterized in that the measuring resistance division module includes reference voltage
Source, gas sensor output end interface and precision resistance.
4. detection system according to claim 1, which is characterized in that the signal filter module include operational amplifier,
Several capacitors and several resistance.
5. detection system according to claim 1, which is characterized in that the single-ended transfer difference module includes common-mode voltage
Source, several operational amplifiers and several resistance.
6. detection system according to claim 1, which is characterized in that the analog-to-digital conversion module include reference voltage source and
N channel analog-digital converter.
7. a kind of SCM Based gas sensor array output detecting method, includes the following steps:
S100: it obtains the output signal of sensor array and is converted to the single-ended analog voltage signal for being easy to measure；
S200: the high-frequency interferencing signal in the single-ended analog voltage signal is filtered out；
S300: the single-ended analog voltage signal after high-frequency interferencing signal will be filtered out and be converted to difference analogue voltage signal；
S400: the difference analogue voltage signal is converted into digital signal；
S500: on-line checking and real-time display testing result are carried out to digital signal.
8. the method according to the description of claim 7 is characterized in that the output signal of the sensor array is that variation is slow
Resistance signal.
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| CN201811316969.4A CN109342660A (en) | 2018-11-07 | 2018-11-07 | SCM Based gas sensor array output detection system and detection method |
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| CN201811316969.4A CN109342660A (en) | 2018-11-07 | 2018-11-07 | SCM Based gas sensor array output detection system and detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112367074A (en) * | 2020-10-29 | 2021-02-12 | 中船动力研究院有限公司 | Single-set interface multifunctional isolation signal processing circuit |
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Application publication date: 20190215 |