CN107703192A - Thermistor（NTC）Microballon gas analysis sensor - Google Patents
Thermistor（NTC）Microballon gas analysis sensor Download PDFInfo
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Abstract
The present invention relates to a kind of thermistor (NTC) microballon gas analysis sensor.Exchanged by thermal information, in real time can be converted into the analog quantity of measurand can be by the linear voltage signal in the analog quantity of computer software programs operation.It is mainly used in：1. turbocharged engine air-fuel ratio controls；2. in super large-scale integration production process, effective control is realized；3. gaseous vapor deposition；4. gas analysis instrument, equipment：Such as power transformer oil gas on-line detecting system；In Medical Instruments Anesthesia machine, the control of narcotic content.
Description
Technical field：Sensor of the invention by multiple thermistors (NTC) microballon, shield pearl material structure body, housing and
Analog electrical signal modulate circuit is formed.Include thermistor analysis microballon and auxiliary microballon in sensor.Analyze microballon measurement
The principal parameter of measurand.Aid in the auxiliary parameter of microballon measurement measurand, such as temperature value.Sensor of the invention passes through
Thermal information exchanges, and in real time can be converted into the analog quantity of measurand can be by the linear in the mould of computer software programs operation
The voltage signal of analog quantity.If not having analog electrical signal modulate circuit, the software program of computer can not just gather measuring circuit
Data, be not just thermistor (NTC) microballon gas analysis sensor.The analog quantity of inventive sensor measurement mainly has：
Gas concentration, gas ingredients content, gas pressure, gas temperature, gas flow rate, gas flow, gas mole number (mole
Amount), molecular weight gas etc..
Background technology：Present invention is mainly applied to：1. turbocharged engine air-fuel ratio controls；2. ultra-large integrated
In circuit manufacturing process, effective control is realized；3. gaseous vapor deposition；4. gas analysis instrument, equipment：Such as power transformer
Device oil gas on-line detecting system；In Medical Instruments Anesthesia machine, the control of narcotic content.
The popularization and application present invention, it is the only way which must be passed that China emerges.
The waste gas that the power of turbocharger is discharged from engine.Turbocharged engine be automobile, aircraft, warship,
The power machine of steamer, generating set etc..China's aircraft is typically using turbofan (power comes from engine in itself) come compressed air.
Turbocharger is either used, or using turbofan, sprays into the fresh air of combustion chamber, its pressure is all higher and very unstable
It is fixed.Simultaneously as engine speed is very high, general 4~8 milliseconds will complete oil spout, jet once.In such operating mode situation
Under, air-fuel ratio is controlled, it is tangible difficult.
There is nearly hundred million, turbocharging automobile in China at present, and very rare vehicle is China's manufacture.In joint venture, automobile
Part domesticizes up to 85%.But due to not understanding foreign Automotive Air Fuel Ratio control sensor, cause to pay no attention to software
Solution, thus Trend of Auto Manufacturing Technologies is controlled by foreign country.Indivedual private enterprise's production turbocharging automobiles, but these automobiles are to fuel oil
Direct mathematics control is not made with air mixture ratio, fuel utilization ratio is low, and vehicle performance is poor.In addition to specific use military secret,
General airliner should control air-fuel ratio, could improve the utilization rate of fuel oil, improve flight and security.
The automobile of joint venture has thermistor (NTC) sensor circuit in engine fuel oil system.It is described above
" not understood to foreign Automotive Air Fuel Ratio control sensor ", that is Electronics Engineer (non-temperature sensitive resistance specialty) is to temperature-sensitive
Electric resistance sensor is not understood.China's conventional art can not solve the ditch between data and C or C Plus Plus caused by thermistor
Correspond topic.For analog quantity after sensor, what is obtained is analog electrical signal.Analog electrical signal needs to be converted into data signal,
Can be by calculating mechanical process.The R/T characteristics of thermistor are (accurate calculation formula)：RT=exp { A0+A1/T+A2/T2+
A3/T3}.No matter the gas analysis of thermometric or the present invention, will use this formula.No matter what tested analog quantity is, such as rub
Your amount, temperature, pressure, flow, flow velocity etc., can be calculated, simply the change of resistance value and resistance value from thermistor.
The electric signal directly obtained from thermistor can not be directly fed to A/D converter.Reason has two：1. this telecommunications
Number it is nonlinear；2. the electric signal for giving A/D converter is voltage signal, between voltage signal and tested analog quantity, do not have
There is the mathematical relationship of determination.The voltage drop at resistor both ends, not exclusively because analog quantity causes, bigger composition comes from electricity
Source component (partial pressure).Machinery Ministry tissue thermistor linearisation research topic continue for 12 years, disclose within 1986 research into
Fruit：" least square method ".This achievement is not consistent with practicality.As can be seen here, conventional art can not be solved caused by thermistor
Communication problem between data and C or C Plus Plus.This problem is related to solid-state physics theory, and needs by substantial amounts of
Test to verify conducting mechanism.Analog electrical signal modulate circuit is the achievement in research of our decades.In terms of product structure, we
Solve the level of this problem and ability is significantly larger than Japan.Analysis microballon is spheroid, and the temperature field of heat exchange is to wait symmetrically
Form.And the thermal resistor of Japan is sheet entirely, thickness and length and width are all asymmetric.
China can not produce super large-scale integration, be because controlling the technique in production process without this sensor
Key element.Almost need to use sensor of the invention in each important procedure.Such as：1. extension：Extension (the SiCl of silicon4+2H2=
Si+4HCl)；Phosphorosilicate glass chemical vapor deposition (SiH4+PH3+O2... ＞ ＞ SiO2+P2O5+H2)；2. oxidation：Mix oxychloride (Si
+O2=SiO2)；3. diffusion：In high temperature furnace, the gas of the impurity containing needed for is passed through, the impurity is spread into silicon crystal body；
4. the ion gun of ion implanting：Phosphine PH3, arsine AsH3Deng gas；5. photoetching：Carve SiO2：CF is passed through in reative cell4、CHF3、
C2F6、CF6、C3F8、NF3Deng gas, reaction (SiO is produced2+ 4F=SiF4(gas)+O2)；Carve aluminium：SiCl is passed through in reative cell4、
BCl3、CCl4+Cl2、BCl3+Cl2Deng gas, reaction (Al+3Cl=AlCl is produced3(gas))；Carve polysilicon：Conventional Cl2、HCl、
SiCl4Deng gas.In above-mentioned 5 examples, every represents a process.Each process will carry out gas reaction (including physics
Reaction and chemical reaction).During the course of the reaction, it is necessary to corresponding gas modulation, such as mixing ratio, mole, switching sequence, pressure
The modulation of power, concentration (doping content), flow, temperature etc., the gas after modulation, according to switching sequence, by gas pipeline, leads
Enter in reative cell.This modulation process technology is intelligent, it should in the leading lower completion of thermistor Thermoanalytic sensor.
Gaseous vapor deposition is the important process of above-mentioned third generation electronic device production.And gallium arsenide photoelectric of future generation
The important procedure of device production.The technological layer of these device productions is micron order, Millisecond, even nanoscale and microsecond
Level.Therefore, the process control of gaseous vapor deposition, the best way are to apply sensor of the invention.
In power transformer oil gas on-line detecting system (hydrogen content in detection oil gas), the U.S. uses thermistor gas
Analyte sensors manage transformer.China is using RTD as branch company in sensor, such as Henan.Thermistor gas
The electric signal of analyte sensors is far longer than RTD, and signal level difference is more than 4 orders of magnitude.
Thermistor Thermoanalytic sensor is got up by U.S.'s thermometrics development of company.The said firm mainly gives birth to
Produce military sensor, thus stealthy (merging with GE).Thermometrics companies are sent out U.S.'s science and technology
Immeasurable contribution has been made in exhibition.
Since 1973, China's research platinum electrode bead thermistor temperature element.1973 to 1981, machinery
Organize research institute of the Chinese Academy of Sciences and the joint research of research institute of Beijing in portion.Substantial amounts of experiment is done over 8 years, in 4 temperature
Area respectively determines 1 formula and its technique.According to the achievement in research of 8 years, 1981 so far, never discontinuously production and operation platinum
Silk electrode thermistor temperature detecting element.Thermistor bead product is larger.If using this four formula be fabricated to the diameters of Φ 0.5 with
Under microballon, they are all insulators in respective warm area.Microballon below the diameters of Φ 0.5 possesses common R/T characteristics, Cai Nengyong
Perform an analysis microballon.During the Φ 0.5 of pearl footpath, platinum filament diameter should be 0.05, when measurement electric current flows through bead, in platinum filament and sensitive material
There is contact resistance at the contact interface of (semiconductive ceramic).This resistance is no contribution to sensitive property.The size of its resistance
Depending on the contact area of platinum filament and sensitive material (ceramics), contact area S=0.05*3.14*0.5=0.0785 millimeters are put down
Side.Because this area is too small, using traditional handicraft and conventional formulation, analysis microballon is not manufactured.
In the past, I had a patent to be authorized to, Patent No. ZL201310239488.9, entitled：" platinum electrode glass
Glass sealing thermistor (NTC) microballon medical energy converter ".The patented product is used to substitute imported from America product, is with following in vitro
The supporting bladder temperature sensor of ring machine.Because it is disposable sterilized product, microballon can be only installed at the pipe of catheter
In wall.The patent technical field, technical scheme, technical characteristic between them, has the technical effect that difference compared with the present invention
's.1. the former does not disclose the technical characteristic parameter of sensor：Maximum power rating and dissipation constant.Input temp sensor
Electrical power be zero power measurement value (self-heating of microballon should not cause measurement error), and input the measurement power of microballon of the present invention
It is rated value, even maximum power rating.High current is passed through to microballon of the present invention, analysis microballon is generated heat.Its heat
So that analysis microballon temperature is significantly larger than measured medium temperature.If it is not known that maximum power rating and dissipation constant, with regard to nothing
Method design and use gas analysis sensor.The maximum power rating for analyzing microballon depends on the microstructure knot of bead material
Structure.The material of advantageous heterogeneous microstructure, just possesses larger through-current capability, and analysis microballon just possesses larger maximum
Power rating.The power rating of input analysis microballon is bigger, and the output of analog electrical signal modulate circuit is bigger.The present invention
Analysis microballon formula and production technology from the former be different.Only analysis microballon of the invention, it could meet to measure work(
The demand of energy.2. the shield pearl material structure body in the present invention, there are two effects：1. makes the heat exchange area of analysis microballon most
Bigization simultaneously determines its area value.The heat exchange area only determined, it just can determine that the heat transfer parameter of dissipation constant etc.；2. is carried
The mechanical performance of high sensor, especially anti-seismic performance.Patent in the past does not have this technical characteristic.3. patent before does not have
Analog electrical signal modulate circuit.Thermistor microballon gas analysis sensor belongs to Computer Applied Technology field.If no
Analog electrical signal modulate circuit, it is not just thermistor microballon gas analysis sensor.
It is the symmetrical surface such as spheroid, spheroid to analyze microballon, the symmetrical heat exchange temperature field such as forms.However, point
The research for analysing microballon is also extremely difficult.Our two generations pass through the painstaking efforts of more than 30 years, have paid heavy cost,
Obtain the achievement of the present invention.Second inventor is my father.His nineteen eighty-two undergraduate education materialogy major, in portion's information
After working 1 year, just transfer to foregoing thermistor temperature detecting element factory and work.From 83 years till now, never interruption pair
The research of thermistor microballon.
The content of the invention：1. adjustment formula, improves technique, make material grains are thinner, crystalline phase evenly.Improve the through-flow of microballon
Ability, improve maximum power rating.Using this high performance material, standard microballon is made, makes physical dimension and pyroelectricity
The corresponding relation of energy, there is the numerical value determined.Make bead surface product that there is one-to-one relation with thermoelectricity capability.The present invention
Standard bead surface product scope is 0.05mm2~0.9mm2.Surface area represents the excursion of microballon thermoelectricity capability.Table
Area 0.057mm2When, thermal time constant is 0.12s (in dead air), 5ms (in hydrostatic), (ms represents millisecond), dissipation constant
(25 DEG C .mw/ DEG C of@) is 0.045 (in dead air), 0.23 (in hydrostatic), maximum power rating 0.006W.Surface area
0.112mm2When, thermal time constant is 0.23s (in dead air), 7ms (in hydrostatic), and dissipation constant (25 DEG C .mw/ DEG C of@) is
0.06 (in dead air), 0.3 (in hydrostatic), maximum power rating 0.008W.Surface area 0.23mm2When, thermal time constant
For 0.5s (in dead air), 10ms (in hydrostatic), dissipation constant (25 DEG C .mw/ DEG C of@) is 0.09 (in dead air), 0.45 (hydrostatic
In), maximum power rating 0.01W.Surface area 0.45mm2When, thermal time constant is that 1.0s (in dead air), 15ms are (quiet
In water), dissipation constant (25 DEG C .mw/ DEG C of@) is 0.10 (in dead air), 0.5 (in hydrostatic), and maximum power rating is
0.014W.During any microballon area, according to the thermoelectricity capability parameter value corresponding to four described area values and each area value, adopt
0.05mm can be tried to achieve with linear interpolation method2~0.9mm2In the range of any microballon area when thermoelectricity capability parameter.Any microbead surface
During product, its resistance R25Range of choice is：1K Ω~10M Ω, material constant B25/50Range of choice be 2500~5000.
2. it is four pin configurations to analyze microballon, shield pearl material structure body is set.Its effect is：It is determined that the heat friendship of analysis microballon
Effective area is changed, and is allowed to maximize；And improve the mechanical performance (such as antidetonation) of sensor.
3. the present invention sets analog electrical signal modulate circuit, solves electric signal linearization problem.Analog electrical signal is nursed one's health
Circuit is the key part of the present invention.After the thermistor temperature detecting element research project running of Machinery Ministry tissue,
Thermistor temp instrument research group is set up within 1980.By the research of 10 years, although the excessively substantial amounts of thermometric of production and operation
Instrument, still, because linearization problem does not solve so that the basic mechanical design feature of this instrument lags far behind other thermometrics member
The instrument of part (such as film platinum resistor).Therefore, traditional thermistor (temperature) sensor application technology stays in the nineties in last century
Level.The present invention solves the problem of practical engineering application, and analog electrical signal is converted to line by analog electrical signal modulate circuit
Property voltage signal in the analog quantity and output, the effective digital of voltage signal be more than or equal to 3, highest order is the ten of millivolt
Position, the effective digital scope of voltage signal are equal to the excursion of analog quantity.Use 3 half or 4 Semi-digital universal meters
Millivolt keeps off the output with regard to that can read analog electrical signal modulate circuit.Therefore, the survey of the known parameters to known measurement object is passed through
Amount experiment, it is possible to verify the output accuracy and linearisation degree of analog electrical signal modulate circuit.
4. at least 1 analysis microballon, typically there is multiple microballons in sensor.Analyze microballon measurement principal parameter；Aid in micro-
Pearl measures auxiliary parameter；Standby microballon is not essential to calibrate the initial parameter of each function microballon.It is self-heating to analyze microballon
Pearl, own temperature are higher than the temperature of measured matter.What it is to analysis microballon input is measurement power rating, or even up to maximum
Power rating.Analysis microballon is spheroid, the symmetrical forms such as the temperature field of heat exchange is.What it is to the input of thermometric microballon is zero
Power measurement values.
5. product of the present invention has specific aim and specificity.Because the sensor of concrete model is according to measurand
Target component design.Such as turbocharged engine air-fuel ratio control sensor is according to The Ideal-Gas Equation
Come what is designed, during design, according to the discharge capacity of engine, to modulate the output area of analog electrical signal modulate circuit, it is made only suitable
Sensor for the displacement engine.
Brief description of the drawings and embodiment：In appended figure, in the form of nonrestrictive citing, illustrate the present invention's
Embodiment.In all the drawings：
Fig. 1 is one-parameter measuring principle figure.Fig. 2 and the figures of Fig. 3 two illustrate the control of turbocharged engine air-fuel ratio to pass jointly
The operation principle of sensor.Fig. 2 is the constructed profile of turbocharged engine air-fuel ratio control sensor.Fig. 3 is sensor W
The schematic diagram of position relationship in fuel system.
In Fig. 1, if the content of Hydrogen in Air is hundred a ten thousandths.Select microballon：Surface area 0.45mm2、R25=142K
Ω、B25/50=3933, analyte sensors are made, it is possible to reach the measurement of PPM class precisions.Operation principle is：It is permanent to input 2.2mA
Electric current, it is therefore an objective to make microballon heat 125 DEG C.2.2mA constant currents be according to selected pearl type (area) with heat, electrical property relation,
Calculate.Calculation formula is：Δ T=P/H, wherein Δ T be heat 125 DEG C, P be input the electrical power (mw) of microballon, H is
0.10mw/ DEG C of dissipation constant.After energization, microballon temperature in still air is 150 DEG C.The resistance of microballon is 2500 at 150 DEG C
Ω, now the Δ R/ Δ T=63 Ω of microballon/DEG C, the two parameters are by microballon R/T characteristic curves (R25=142K Ω, B25/50
=3933) determine.The thermal conductivity of hydrogen is 0.163W/ (m DEG C)；The thermal conductivity of air is 0.0233W/ (m DEG C).In figure
G points are common port, current potential zero.R1=1000 Ω, R3=2500 Ω, RP are 2000~3000 Ω precision adjustable resistors.Survey
Try the first step：Valve is opened, is put into air, is passed through constant current 2.2mA, RP is adjusted, makes microvoltmeter V1-2=0, i.e. U1=U2；Survey
Try second step：Air is discharged, sample gas is put into, is passed through constant current 2.2mA.Now, U1 current potential is higher than U2 current potential, and here it is sample
The analogue data of gas.When containing hundred a ten thousandth hydrogen in sample gas, sample gas consumption dissipates the heat ratio pure air dissipation microballon of microballon
Heat it is big, microballon is reduced 8.75*10-4DEG C (=1*10-6* 125*0.163/0.0233), increase the resistance value of microballon
0.055 Ω, so that V1-2=U1-U2=121 (microvolt).Equipment circuit is by V1-2Data conversion is carried out, just obtains measurement knot
Fruit.
In figs. 2 and 3,1 stainless steel tube is represented；2 represent the electrically insulating material of the heat-insulation and heat-preservation of form；3 represent
Analyze microballon；4 represent the electrode of analysis microballon, i.e. sensor lead；5 represent sensor outer lead；6 represent form
The electrically insulating material of heat-insulation and heat-preservation；7 represent thermometric microballon；8 represent stainless steel tube；9 represent stainless steel cloth；10 represent sensor
Housing；H represents shield pearl material structure body；M represents the position relationship of shield pearl material structure body and microballon；N is identical with M structure,
Intersect 90 ° of angles on heart axis direction in the sensor；Y1 represents analog electrical signal modulate circuit 1；Y2 represents that analog electrical signal is adjusted
Manage circuit 2；Y3 represents analog electrical signal modulate circuit 3；11 represent ignition coil；12 represent lambda sensor；13 represent camshaft
Position sensor；14 represent crankshaft position sensor；15 represent cooling-water temperature sensor；16 represent fuel injector；17 represent air throttle position
Put sensor；18 represent IAC；19 represent sampled air entrance；20 expression sampled airs flow through the abdomen of measurement microballon
Portion；W represents the turbocharged engine air-fuel ratio control sensor shown in Fig. 2.
The control of turbocharged engine air-fuel ratio is completed by a sub-controller in engine intelligent ECU.Point
Controller is the software and hardware system for being core by single-chip microcomputer, being formed.The hardware circuit of this sub-controller mainly includes single-chip microcomputer
Modular circuit, I/O port expansion circuits, A/D modular converters circuit, measuring circuit, pwm signal generation circuit, telecommunication circuit, execution
Device (such as fuel injector) drive circuit；Main program of the software including the sub-controller, A/D conversion programs, update the data program, data
Conversion processor, interrupt routine, delay procedure, actuator control program etc..
Turbocharged engine air-fuel ratio controls operation principles of the sensor in sub-controller：Measured according to sensor
Into the air capacity of cylinder, sub-controller calculates the expense of fuel oil, and driving spray is converted to by the data processor in software
The width of the pulsed current signal of oily device magnet coil, fuel injection needle is opened, sprays into desired amount of fuel oil, so, just completed
Oil spout, the preparation of jet action.So, sensor is how to measure air capacity and how sub-controller calculates fuel oil again
ExpenseThe output area of sensor is determined by engine displacement, and the output area of sensor and driving fuel injector
The width of the pulsed current signal of magnet coil is corresponding.The upper and lower limit output valve of sensor and the pulse of driving fuel injector are believed
Number width upper and lower limit numerical value it is corresponding.The Y1 and Y2 of sensor share out the work and help one another, there is provided The Ideal-Gas Equation n=PV/
Data in 8.31T, by the data calculation procedure of software, with regard to air capacity n can be calculated.Y1 provides PV linear output value, Y2
T linear output value is provided.Y1 linear output value is by dissipation constant, R25、B25/50, measurement power rating, flow velocity to dissipate
Constant influences coefficient, gas pressure influences 6 data such as coefficient on dissipation constant and determined.By the adjustment to preceding 5 parameters, make
Y1 output valve direct ratio, linearly in PV product.The adjustment of preceding 4 parameters, reader are understood that.By changing sampled air entrance
The ratio of 19 sectional area and the sectional area of belly 20, to change the 5th parameter.The expense of fuel oil is calculated according to air-fuel ratio
's.The expense of fuel oil is represented using the width of the pulsed current signal (PWM) of driving fuel injector magnet coil.Generally make arteries and veins
The Cycle Length (such as 8ms) of punching immobilizes, and only changes the dutycycle of square wave, i.e. injection duration (2~8ms), to realize
The regulation of distributive value.As can be seen here, engine air-fuel ratio control process is exactly：Sub-controller lower limit on a sensor it is linear defeated
In the range of going out, the data of sensor measuring circuit are gathered to adjust the width of the pulsed current signal of driving fuel injector magnet coil
Degree.
If sensor thermal response lag time is long, the rhythm of running software sequential is not caught up with, program will be read
The data of mistake, cause program operation failure.There was only several milliseconds per cylinder jet time, but engine is more cylinder structures, and each cylinder connects
Continuous circulation jet, make the gas continuous flow of jet house steward.Because sensor is arranged in jet house steward, so during program samples
Between could be arranged to hundred Milliseconds, update gathered data time be arranged to 1 second.As long as the hot time of the sensor microballon set
Constant is less than 1 second, would not influence measurement accuracy.In the time per second, program according to a data (1 pulse signal
Width value) operate fuel injector, carry out repeatedly (more than 100 times) oil spout, it is possible to achieve the high accuracy of control.Pwm signal produces electricity
It is 1 delicate clock signal that road, which can produce precision,.
Claims (2)
1. a kind of thermistor (NTC) microballon gas analysis sensor, including one or more thermistors (NTC) analysis microballon,
Aid in microballon, shield pearl material structure body, housing and analog electrical signal modulate circuit, it is characterised in that：Described analysis microballon tool
There are four pins, bead surface product scope is 0.05mm2~0.9mm2, surface area represents the change model of microballon thermoelectricity capability
Enclose, surface area 0.057mm2When, thermal time constant is 0.12s (in dead air), 5ms (in hydrostatic), (ms represents millisecond), is dissipated
Constant (25 DEG C .mw/ DEG C of@) is 0.045 (in dead air), 0.23 (in hydrostatic), maximum power rating 0.006W, surface area
0.112mm2When, thermal time constant is 0.23s (in dead air), 7ms (in hydrostatic), and dissipation constant (25 DEG C .mw/ DEG C of@) is
0.06 (in dead air), 0.3 (in hydrostatic), maximum power rating 0.008W, surface area 0.23mm2When, thermal time constant
For 0.5s (in dead air), 10ms (in hydrostatic), dissipation constant (25 DEG C .mw/ DEG C of@) is 0.09 (in dead air), 0.45 (hydrostatic
In), maximum power rating 0.01W, surface area 0.45mm2When, thermal time constant is that 1.0s (in dead air), 15ms are (quiet
In water), dissipation constant (25 DEG C .mw/ DEG C of@) is 0.10 (in dead air), 0.5 (in hydrostatic), and maximum power rating is
0.014W, during any microballon area, according to the thermoelectricity capability parameter value corresponding to four described area values and each area value, adopt
0.05mm can be tried to achieve with linear interpolation method2~0.9mm2In the range of any microballon area when thermoelectricity capability parameter, described shield pearl
Material structure body is made up of the electrically insulating material of metal material and the heat-insulation and heat-preservation of form, and four pins of microballon are fixed
Get up, the contact area for protecting pearl material structure body and bead surface is less than the 10% of microballon total surface area, microballon is situated between with tested
The contact surface of matter such as possesses at the symmetrical shape, and described analog electrical signal modulate circuit has 6 pins, two power pins V+ and G,
Analog quantity is changed into analog electrical signal by sensor, and analog electrical signal modulate circuit, analog electrical signal are linked into by two pins
Modulate circuit by analog electrical signal be converted to linearly in the analog quantity voltage signal and exported by two pins, voltage signal
Effective digital is more than or equal to 3, and highest order is ten of millivolt, and the effective digital scope of voltage signal is equal to the analog quantity
Excursion.
2. thermistor (NTC) microballon gas analysis sensor according to claim 1, it is characterized in that described analysis is micro-
Pearl and the normal resistance R of auxiliary microballon25Range of choice be 1K Ω~10M Ω, material constant B25/50Range of choice be
2500~5000.
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