CN109374732A - Tomography escapes the portable quick hydrogen-measuring apparatus of gas and its monitoring method - Google Patents
Tomography escapes the portable quick hydrogen-measuring apparatus of gas and its monitoring method Download PDFInfo
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- CN109374732A CN109374732A CN201810926066.1A CN201810926066A CN109374732A CN 109374732 A CN109374732 A CN 109374732A CN 201810926066 A CN201810926066 A CN 201810926066A CN 109374732 A CN109374732 A CN 109374732A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
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- G01N29/036—Analysing fluids by measuring frequency or resonance of acoustic waves
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N2291/014—Resonance or resonant frequency
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
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Abstract
The present invention relates to a kind of portable quick hydrogen-measuring apparatus of tomography evolution gas and its monitoring methods.Hydrogen-measuring apparatus includes the first air inlet, the second air inlet, gas outlet, three-way magnetic valve, speed regulation air pump, quartz crystal oscillator hydrogen sensitive film sensor, oxygen carrier clarifier and control circuit；First air inlet is connected with a bite of three-way magnetic valve, and two mouthfuls of three-way magnetic valve, speed regulation air pump, quartz crystal oscillator hydrogen sensitive film sensor and gas outlet pass sequentially through pipeline and be connected；Second air inlet is connected with the import of oxygen carrier clarifier, and the outlet of oxygen carrier clarifier is connected with three mouthfuls of three-way magnetic valve, and three-way magnetic valve, speed regulation air pump and quartz crystal oscillator hydrogen sensitive film sensor are connected with control circuit respectively.The present invention is reduced the influence of interference gas, improves the accuracy of measurement by being measured based on surface acoustic wave sensing technology to density of hydrogen.Measurement gas circuit and purification gas circuit are switched over by automatically controlling, and highly shortened the measurement recovery time of device, improve observed efficiency.
Description
Technical field
The present invention relates to a kind of hydrogen detection device more particularly to a kind of tomography portable quick hydrogen-measuring apparatus of evolution gas and
Its monitoring method, the field movable suitable for earthquake fault exploration and mine prospection detect.
Background technique
Density of hydrogen in the earth's crust is higher by thousands of, tens of thousands of or even hundreds of thousands times than the density of hydrogen in atmosphere.In the earth's crust
Hydrogen is mainly derived from biological chemistry action and chemical action, therefore in oil-and-gas basin, tectinic mobile belt, geothermal area and volcanic rock
Area can find the higher hydrogen source of concentration.Research shows that hydrogen is power actuated in close relations with the earth's crust now, especially
It is stored with seismic activity, coal mine in close relations.Pass through the variation of detection density of hydrogen, especially detection tomography fluid in earth's surface
The concentration for overflowing hydrogen in gas, can not only find tomography crustal motion active regions as earthquake precursor observation point, Er Qieke
Using the effective means as expiloration of coal mines, oil field prospecting.
Domestic External Observation density of hydrogen mainly uses thermal conductivity detector (TCD) gas chromatograph, but its sensitivity is lower, detection
Limit generally 10 × 10-6(10ppm), and the background value of hydrogen is 0.5ppm in soil, therefore, this detection device is not able to satisfy
The needs of formation gas detection.The sensitivity usually with higher of the hydrogen sensor of semi-conductor type and lower detection limit, but
In the quickly hydrogen of continuous measurement higher concentration, sensor is easy to appear of short duration intoxicating phenomenon, influences measurement efficiency, and mesh
The preceding hydrogen meter both at home and abroad based on semi-conductor type is chiefly used in Laboratory Observation.In addition, either chromatograph or semiconductor pass
Sensor, when detection, are required to through gas-chromatography post separation gas, but the use of chromatographic column need certain temperature and flow velocity and
With lossy, especially when alkanes gas content is higher in detection gas, the anti-interference of the quick detection method of these hydrogen compared with
Difference.Therefore, existing hydrogen meter can not be used for quickly detecting density of hydrogen in tomography evolution gas in field, be unable to satisfy field
The demand of mobile detection.
Summary of the invention
In order to solve the above-mentioned technical problem the present invention, provides a kind of portable quick hydrogen-measuring apparatus of tomography evolution gas and its prison
Survey method realizes continuous quick in situ measurement, and hydrogen gas sensor anti-interference used is good, and measuring range is big, and detection limit is low, from
It is dynamic to complete measurement and purification, accelerate the resume speed of hydrogen gas sensor, improves measuring accuracy.
Above-mentioned technical problem of the invention is mainly to be addressed by following technical proposals: tomography evolution of the invention
The portable quick hydrogen-measuring apparatus of gas, including the first air inlet, the second air inlet, gas outlet, three-way magnetic valve, speed regulation air pump, stone
English crystal oscillator hydrogen sensitive film sensor, oxygen carrier clarifier and control circuit；First air inlet is connected with a bite of three-way magnetic valve, and three
Two mouthfuls of three-way electromagnetic valve, speed regulation air pump, quartz crystal oscillator hydrogen sensitive film sensor and gas outlet pass sequentially through pipeline and are connected；Second into
Port is connected with the import of oxygen carrier clarifier, and the outlet of oxygen carrier clarifier is connected with three mouthfuls of three-way magnetic valve, three-way magnetic valve,
Speed regulation air pump and quartz crystal oscillator hydrogen sensitive film sensor are connected with the control circuit respectively.Control circuit controls threeway electromagnetism
The conducting direction of valve realizes measurement gas circuit and purifies the switching of gas circuit, and control circuit controls the work of speed regulation air pump, by speed regulation gas
The flow velocity of gas in pump control gas circuit.When a bite of three-way magnetic valve and two mouthfuls of conductings, the first air inlet, three-way magnetic valve, tune
Fast air pump, quartz crystal oscillator hydrogen sensitive film sensor and gas outlet are linked to be measurement gas circuit；Three mouthfuls of three-way magnetic valve and two mouthfuls conductings
When, the second air inlet, oxygen carrier clarifier, three-way magnetic valve, speed regulation air pump, quartz crystal oscillator hydrogen sensitive film sensor and gas outlet connect
At purification gas circuit.When measurement, sample gas enters the first air inlet of device, is input to quartz-crystal through three-way magnetic valve, speed regulation air pump
Shake hydrogen sensitive film sensor, and quartz crystal oscillator hydrogen sensitive film sensor is detected the density of hydrogen in sample gas and conveyed with digital signal
To control circuit, control circuit is handled, and shows the density of hydrogen measured by display screen, and by storage chip store to
Movable storage device, residual gas are discharged through the gas outlet of device.It is measured, to improve sensor resume speed, purified gas
Road is started to work, and air is flowed into from the second air inlet of device, through oxygen carrier clarifier dehydrogenation oxygen carrier, by three-way magnetic valve, is adjusted
Fast air pump is input to quartz crystal oscillator hydrogen sensitive film sensor, replaces the indoor residual gas of sensor gas, and make the oxygen in air
Ion reacts the hydrogen molecule adsorbed in release film with hydrogen sensitive film, and the gas containing hydrogen molecule is discharged through the gas outlet of device.
It adjusts the speed air pump and adjusts the supply voltage for adjusting air pump according to the measuring command or cleaning command of control circuit by PWM, further
The gas production flow of air pump is adjusted, to meet measurement, purification demand.The technical program reduces the hardware of device using air pump is adjusted
Setting, reduces the volume and power consumption of device, meets the requirement of portable, low-power consumption, small size.The technical program is using quartz
Crystal oscillator hydrogen sensitive film sensor measurement hydrogen, fast response time, high sensitivity and strong interference immunity, measuring range is big, detection limit
It is low.Hydrogen-measuring apparatus uses binary channels gas circuit, utilizes the absorption in purification gas circuit Rapid Cleaning quartz crystal oscillator hydrogen sensitive film sensor
Hydrogen and residual hydrogen, increase substantially the resume speed of sensor, realize quickly continuous measurement and analysis.Meet field pair
Density of hydrogen is used for quickly detecting, moves the demand of detection in tomography evolution gas.
Preferably, the quartz crystal oscillator hydrogen sensitive film sensor includes the cylinder housing to form cylindrical body gas chamber,
The side of cylinder housing is equipped with the sensor import of the setting substantially symmetrical about its central axis of cylinder housing and sensor outlet, cylinder
One end face of body shell body is equipped with quartz crystal, and the center of quartz crystal is connected with first electrode, cylinder housing
Another end face is equipped with the induction resonance piece that surface is coated with hydrogen sensitive film, and the edge for incuding resonance piece is connected with second electrode,
First electrode, second electrode are connected with the control circuit respectively.Quartz crystal oscillator hydrogen sensitive film sensor is according to hydrogen and its
He in the velocity of sound there is this characteristic of the difference of highly significant to pass through quartz crystal using surface acoustic wave sensing technology by gas
The induction resonance piece that caused oscillation causes surface to be coated with hydrogen sensitive film resonates, and resonance piece is incuded after hydrogen sensitive film adsorbed hydrogen
Frequency of oscillation can change, i.e. the variation of the frequency of oscillation of induction resonance piece reflects the density of hydrogen in sample gas, pass through survey
The frequency variation of amount induction resonance piece is to obtain the density of hydrogen in tested gas.Quartz crystal oscillator hydrogen sensitive film sensor uses
Micro-electronic mechanical skill is prepared.The electrode of quartz crystal uses parallel field excitation, and vibration, sense are generated under voltage signal
Answer resonance piece that the variation of resonance frequency is transmitted to control circuit by electrode.Caused by the technical program passes through quartz crystal
Oscillation causes surface to be coated with the induction resonance piece resonance of hydrogen sensitive film, so that density of hydrogen is measured, fast response time, sensitivity
Height, strong interference immunity.
Preferably, the quartz crystal, induction resonance piece are circular piezoelectric vibrator, it is plated in induction resonance piece table
The hydrogen sensitive film in face is that is prepare using sol-gal process adulterate the tungstic acid microporous membrane of palladium particle, in tungstic acid micropore
Supported palladium particle.
Preferably, the quartz crystal oscillator hydrogen sensitive film sensor includes signal processing circuit, signal processing circuit packet
Crystal oscillating circuit and frequency detection circuit are included, the quartz crystal is connected by first electrode with crystal oscillating circuit,
The induction resonance piece is connected by second electrode with frequency detection circuit, crystal oscillating circuit, frequency detection circuit difference
It is connected with the governor circuit.Crystal oscillating circuit uses parallel connection type feed circuit, and DC energy is converted into required oscillation
The AC energy of frequency.Resonance piece will be incuded as positive feedback unit and access frequency detection circuit, frequency detection circuit detection sense
The frequency of resonance piece is answered to change, the signal measured is conveyed to control circuit.
Preferably, being equipped with temperature sensor, temperature sensor and institute in the quartz crystal oscillator hydrogen sensitive film sensor
The control circuit stated is connected.The indoor temperature change of temperature sensor real-time monitoring quartz crystal oscillator hydrogen sensitive film sensor gas is surveyed
The temperature value obtained is conveyed to control circuit and is handled, by control circuit that collected temperature value and the temperature-compensating prestored is electric
Pressure is compared, and temperature-compensated voltage data are returned to the temperature-compensating that crystal oscillating circuit realizes frequency by calculating, are disappeared
Except oscillatory drift caused by temperature.
Preferably, the oxygen carrier clarifier includes tubular shell, the both ends of tubular shell be respectively equipped with clarifier into
Mouth, clarifier outlet, tubular shell is interior to be equipped with hydrophobic filter membrane, and the centre of hydrophobic filter membrane is equipped with porous composite reactive carbon fiber
The inner surface load of dimension, hole has oxonium ion.
Preferably, the control circuit includes signal processing circuit, frequency differential circuit, low-pass filtering amplification electricity
Road, A/D conversion circuit, microprocessor unit, driving unit and man-machine interaction unit and for entire hydrogen-measuring apparatus provide work electricity
The power supply unit of pressure, the quartz crystal oscillator hydrogen sensitive film sensor are connected with signal processing circuit, signal processing circuit, frequency
Difference channel, low-pass filtering amplifying circuit, A/D conversion circuit and microprocessor unit are sequentially connected, signal processing circuit, driving
Unit, man-machine interaction unit are connected with microprocessor unit respectively, driving unit respectively with the three-way magnetic valve, speed regulation gas
Pump is connected.Signal processing circuit can be set to belong to control circuit, may be set to be and belongs to quartz crystal oscillator hydrogen sensitive film biography
Sensor.Man-machine interaction unit includes liquid crystal display and multiple keys.Staff passes through the work by key assignments hydrogen-measuring apparatus
State, microprocessor unit realize measurement gas circuit by the conducting direction that driving unit controls three-way magnetic valve and purify gas circuit
Switching, microprocessor unit control the work of speed regulation air pump by driving unit, by the stream of gas in speed regulation air pump control gas circuit
Speed, microprocessor unit control the frequency of oscillation of crystal oscillating circuit, and frequency detection circuit obtains the oscillation frequency of induction resonance piece
Rate is conveyed to frequency differential circuit, then the amplification and the conversion of A/D conversion circuit of low-pass filtered amplifying circuit, finally conveys
To microprocessor unit, is handled, shown and stored by microprocessor unit.Microprocessor unit passes through spi bus or IIC
Bus is communicated with other modules, the work of the entire hydrogen-measuring apparatus of coordinated control.
The monitoring method of the tomography evolution portable quick hydrogen-measuring apparatus of gas of the invention are as follows: first air inlet, three
Three-way electromagnetic valve, speed regulation air pump, quartz crystal oscillator hydrogen sensitive film sensor and gas outlet are linked to be measurement gas circuit, second air inlet
Mouth, oxygen carrier clarifier, three-way magnetic valve, speed regulation air pump, quartz crystal oscillator hydrogen sensitive film sensor and gas outlet are linked to be purification gas circuit；
The conducting direction of the control circuit control three-way magnetic valve realizes measurement gas circuit and purifies the switching of gas circuit, control circuit control
The work of system speed regulation air pump controls the flow velocity of gas in gas circuit, the output of quartz crystal oscillator hydrogen sensitive film sensor by speed regulation air pump
Transducing signal be conveyed to the control circuit, handled, shown and stored by control circuit；When measurement, gas circuit is measured
Work, sample gas make sample gas with fixation through the first air inlet and three-way magnetic valve flow direction speed regulation air pump under the control of speed regulation air pump
Flow velocity enters quartz crystal oscillator hydrogen sensitive film sensor, then flows out through quartz crystal oscillator hydrogen sensitive film sensor from gas outlet, quartz-crystal
Vibration hydrogen sensitive film sensor output reflects the hydrogen transducing signal of density of hydrogen in sample gas and hydrogen transducing signal is conveyed to institute
The control circuit stated；When purification, purification gas circuit work, air flows into oxygen carrier clarifier through the second air inlet, and purified device purifies,
So that oxygen-enriched few hydrogen in air, the air of oxygen-enriched few hydrogen flows to speed regulation air pump through three-way magnetic valve, under the control of speed regulation air pump
Air is set to enter quartz crystal oscillator hydrogen sensitive film sensor with fixed flow rate, quartz crystal oscillator hydrogen sensitive film sensor, which quickly absorbs oxygen, to be released
Hydrogen release, achievees the purpose that purification, and residual gas is flowed out through quartz crystal oscillator hydrogen sensitive film sensor from gas outlet again.The technical program
Using quartz crystal oscillator hydrogen sensitive film sensor measurement hydrogen, fast response time, high sensitivity and strong interference immunity, measuring range
Greatly, detection limit is low.Hydrogen-measuring apparatus uses binary channels gas circuit, utilizes purification gas circuit Rapid Cleaning quartz crystal oscillator hydrogen sensitive film sensor
The hydrogen and residual hydrogen of interior absorption, increase substantially the resume speed of sensor, realize quickly continuous measurement and analysis.It is full
Sufficient field is used for quickly detecting, moves the demand of detection to density of hydrogen in tomography evolution gas.
Preferably, the quartz crystal oscillator hydrogen sensitive film sensor includes the cylinder housing to form cylindrical body gas chamber,
The side of cylinder housing is equipped with the sensor import of the setting substantially symmetrical about its central axis of cylinder housing and sensor outlet, cylinder
One end face of body shell body is equipped with quartz crystal, and the center of quartz crystal is connected with first electrode, cylinder housing
Another end face is equipped with induction resonance piece, and the edge for incuding resonance piece is connected with second electrode；The tomography evolution gas is just
Taking the quick hydrogen-measuring apparatus of formula includes the signal processing circuit being made of crystal oscillating circuit and frequency detection circuit, quartz crystal
It is connected by first electrode with crystal oscillating circuit, induction resonance piece is connected by second electrode with frequency detection circuit, crystal
Oscillating circuit, frequency detection circuit are connected with the control circuit respectively；The monitoring method includes: by crystal oscillation electricity
Road controls the frequency of oscillation of quartz crystal, and the induction resonance piece that the oscillation of quartz crystal causes surface to be coated with hydrogen sensitive film is total
It shakes, the frequency of oscillation that resonance piece is incuded after hydrogen sensitive film adsorbed hydrogen can change, that is, incude the frequency of oscillation of resonance piece
Variation reflects the density of hydrogen in sample gas, and the frequency of oscillation of induction resonance piece is measured by frequency detection circuit, and is conveyed to
Control circuit is handled and is calculated through control circuit, obtains the density of hydrogen in sample gas.The electrode of quartz crystal uses parallel field
Excitation generates vibration under voltage signal, incudes resonance piece by electrode and the variation of resonance frequency is transmitted to control circuit.This
Technical solution is resonated by the induction resonance piece that oscillation caused by quartz crystal causes surface to be coated with hydrogen sensitive film, to measure
Density of hydrogen out, fast response time, high sensitivity, strong interference immunity.
Preferably, being equipped with temperature sensor, temperature sensor and the control circuit in the cylinder case body
It is connected；The monitoring method includes: crystal oscillating circuit using parallel connection type feed circuit, and DC energy is converted into required vibration
The AC energy for swinging frequency is conveyed to quartz crystal, and frequency of oscillation is eliminated using temperature-compensation method and made an uproar caused by temperature drift
Sound is gone out the temperature of quartz crystal by temperature sensor measurement, and collected temperature value is transferred to control circuit, by controlling
Collected temperature value and the temperature-compensated voltage prestored are compared circuit, are returned temperature-compensated voltage data by calculating
The temperature-compensating of frequency is realized back to crystal oscillating circuit.The influence for reducing temperature, improves the reliability and accuracy of measurement.
The beneficial effects of the present invention are: utilizing the velocity of sound and other gases of hydrogen by being based on surface acoustic wave sensing technology
The velocity of sound differ biggish principle, density of hydrogen is measured, the influence of interference gas is reduced, improves the accuracy of measurement,
Measuring range is big, and detection limit is low.With measurement gas circuit and purification gas circuit, two gas circuits are switched over by automatically controlling, operation side
Just, gas phase splitter is not used, the measurement response time is improved, purification gas circuit completes cleaning function, helps hydrogen gas sensor fast
Quick-recovery highly shortened the measurement recovery time of device, improve observed efficiency.Realize field to hydrogen in tomography evolution gas
Concentration is used for quickly detecting, and meets the needs of field movable detection.
Detailed description of the invention
Fig. 1 is a kind of attachment structure schematic diagram of the invention.
Fig. 2 is a kind of structural schematic diagram of quartz crystal oscillator hydrogen sensitive film sensor in the present invention.
Fig. 3 is a kind of circuit theory connection block diagram of control circuit in the present invention.
1. first air inlet in figure, 2. second air inlets, 3. gas outlets, 4. three-way magnetic valves, 5. speed regulation air pumps, 6. quartz
Crystal oscillator hydrogen sensitive film sensor, 7. oxygen carrier clarifiers, 8. control circuits, 9. cylinder housing, 10. signal processing circuits, 11. pass
Sensor import, 12. sensor outlets, 13. quartz crystals, 14. first electrodes, 15. induction resonance pieces, 16. second electrodes,
17. temperature sensor, 18. crystal oscillating circuits, 19. frequency detection circuits, 20. frequency differential circuits, the amplification of 21. low-pass filtering
Circuit, 22.A/D conversion circuit, 23. microprocessor units, 24. driving units, 25. man-machine interaction units, 26. power supply units.
Specific embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
Embodiment: the tomography of the present embodiment escapes the portable quick hydrogen-measuring apparatus of gas, as shown in Figure 1, including the first air inlet
The 1, second air inlet 2 of mouth, gas outlet 3, three-way magnetic valve 4, speed regulation air pump 5, quartz crystal oscillator hydrogen sensitive film sensor 6, oxygen carrier are net
Change device 7 and control circuit 8.First air inlet is connected with a bite of three-way magnetic valve, two mouthfuls of three-way magnetic valve, speed regulation air pump,
Quartz crystal oscillator hydrogen sensitive film sensor and gas outlet pass sequentially through pipeline and are connected；The import phase of second air inlet and oxygen carrier clarifier
Even, the outlet of oxygen carrier clarifier is connected with three mouthfuls of three-way magnetic valve.When a bite of three-way magnetic valve and two mouthfuls of conductings, first into
Port, three-way magnetic valve, speed regulation air pump, quartz crystal oscillator hydrogen sensitive film sensor and gas outlet are linked to be measurement gas circuit；Threeway electromagnetism
When three mouthfuls of valve and two mouthfuls conductings, the second air inlet, oxygen carrier clarifier, three-way magnetic valve, speed regulation air pump, quartz crystal oscillator hydrogen are quick thin
Film sensors and gas outlet are linked to be purification gas circuit.Oxygen carrier clarifier includes the tubular shell made of PA tube, caliber 12mm,
Pipe range 50mm, the both ends of tubular shell are respectively clarifier import, clarifier outlet, and tubular shell is provided with hydrophobic filter membrane, dredges
The centre of water filter membrane is composite reactive carbon fiber, and fibre diameter 0.5mm, the porous aperture of fiber is 5 μm, internal surface of hole activation
Modified load oxonium ion.
As shown in Fig. 2, quartz crystal oscillator hydrogen sensitive film sensor 6 is prepared using MEMS technology, it is a kind of miniature hydrogen
Sensor, including formed cylindrical body gas chamber cylinder housing 9 and signal processing circuit 10, cylindrical body gas chamber be diameter 15mm,
The cylindrical body of length 8mm, the side of cylinder housing are provided with using the central axis of cylinder housing as the symmetrically arranged biography of symmetry axis
The aperture of sensor import 11 and sensor outlet 12, sensor import and sensor outlet is 2mm.One end of cylinder housing
Quartz crystal 13 is housed, the center of quartz crystal is connected with first electrode 14, and quartz crystal uses circular piezoelectric on face
Oscillator, with a thickness of 0.5~0.8mm, the section AT, fundamental frequency is 30~40MHz；Surface is housed on another end face of cylinder housing
It is coated with the induction resonance piece 15 of hydrogen sensitive film, the edge for incuding resonance piece is connected with second electrode 16, and induction resonance piece also uses
Circular piezoelectric vibrator, substrate is identical with quartz crystal, and the hydrogen sensitive film for being plated in induction resonance piece surface is doping palladium particle
Tungstic acid microporous membrane, is prepared using sol-gal process, tungstic acid partial size 10nm, micropore size 0.3nm, and tungstic acid is micro-
Supported palladium particle in hole, hydrogen sensitive film diameter 10mm, with a thickness of 1500nm.Temperature sensor 17 is installed in cylinder case body.
Signal processing circuit includes crystal oscillating circuit 18 and frequency detection circuit 19, and quartz crystal is shaken by first electrode and crystal
It swings circuit to be connected, induction resonance piece is connected by second electrode with frequency detection circuit.
As shown in figure 3, control circuit 8 includes frequency differential circuit 20, low-pass filtering amplifying circuit 21, A/D conversion circuit
22, microprocessor unit 23, driving unit 24 and man-machine interaction unit 25 and the electricity of operating voltage is provided for entire hydrogen-measuring apparatus
Source unit 26, driving unit, man-machine interaction unit are connected with microprocessor unit respectively, and man-machine interaction unit includes liquid crystal display
Screen and multiple keys, driving unit are connected with three-way magnetic valve, speed regulation air pump respectively.Microprocessor unit and crystal oscillating circuit
It is connected, crystal oscillating circuit, frequency detection circuit are connected with frequency differential circuit respectively, and frequency differential circuit is again and low-pass filtering
Amplifying circuit is connected, and low-pass filtering amplifying circuit is connected with A/D conversion circuit again, and A/D conversion circuit is again and microprocessor unit
It is connected.Temperature sensor is also connected with microprocessor unit.The electrode of quartz crystal uses parallel field excitation when measurement, in electricity
It presses and generates vibration under 3~5mV of signal, incude resonance piece by electrode and the variation of resonance frequency is transmitted to signal processing.
The detection sensitivity of quartz crystal oscillator hydrogen sensitive film sensor is less than 0.5ppb/Hz, response time 10s.
The monitoring method of the above-mentioned tomography evolution portable quick hydrogen-measuring apparatus of gas are as follows: staff is by surveying hydrogen by key assignments
The working condition of device, microprocessor unit by driving unit control three-way magnetic valve conducting direction realize measurement gas circuit and
The switching of gas circuit is purified, microprocessor unit controls the work of speed regulation air pump by driving unit, controls gas circuit by speed regulation air pump
The flow velocity of middle gas, microprocessor unit control the frequency of oscillation of crystal oscillating circuit, and frequency detection circuit obtains induction resonance
The frequency of oscillation of piece is conveyed to frequency differential circuit, then low-pass filtered amplifying circuit and A/D conversion circuit, is finally conveyed to
Microprocessor unit is handled by microprocessor unit, shown and is stored；Microprocessor unit is total by spi bus or IIC
Line is communicated with other modules, the entire hydrogen-measuring apparatus of coordinated control；
When measurement, measurement gas circuit work, sample gas is through the first air inlet and three-way magnetic valve flow direction speed regulation air pump, in speed regulation gas
Sample gas is set to enter quartz crystal oscillator hydrogen sensitive film sensor with 200~230ml/min fixed flow rate under the control of pump, it is ensured that sensor
Response time it is most short, crystal oscillating circuit control quartz crystal frequency of oscillation, crystal oscillating circuit using parallel connection type it is anti-
The AC energy that DC energy is converted into required frequency of oscillation is conveyed to quartz crystal by current feed circuit, and frequency of oscillation is using temperature
It spends compensation method and eliminates noise caused by temperature drift, the temperature of quartz crystal is gone out by temperature sensor measurement, and will acquisition
To temperature value be transferred to microprocessor unit, by microprocessor unit by collected temperature value and prestore temperature-compensating electricity
Pressure is compared, and temperature-compensated voltage data is returned to crystal oscillating circuit by calculating, and by crystal oscillating circuit
Varactor realize that the temperature-compensating of frequency of oscillation, the oscillation of quartz crystal cause surface to be coated with the induction of hydrogen sensitive film
Resonance piece resonates, and the frequency of oscillation that resonance piece is incuded after hydrogen sensitive film adsorbed hydrogen can change, that is, incudes the vibration of resonance piece
The variation for swinging frequency reflects density of hydrogen in sample gas, will induction resonance piece it is electric as positive feedback unit access frequency detecting
Road, by frequency detection circuit measure induction resonance piece frequency of oscillation, the frequency differential circuit being conveyed in control circuit, then
Low-pass filtered amplifying circuit and A/D conversion circuit, are finally conveyed to microprocessor unit, are carried out by microprocessor unit
Reason, display and storage, obtain the density of hydrogen in sample gas, and residual gas is flowed through quartz crystal oscillator hydrogen sensitive film sensor from gas outlet
Out；
When purification, purification gas circuit work, air flows into oxygen carrier clarifier through the second air inlet, and purified device purifies, so that
Oxonium ion increases in air, hydrogen molecule is reduced, and the air of oxygen-enriched few hydrogen flows to speed regulation air pump through three-way magnetic valve, in speed regulation gas
Air is set to enter quartz crystal oscillator hydrogen sensitive film sensor with 50~60ml/min fixed flow rate under the control of pump, hydrogen sensitive film is quick
Oxygen evolution hydrogen is absorbed, the gas in sensor is replaced rapidly, achievees the purpose that purification, residual gas is quick from quartz crystal oscillator hydrogen
The sensor outlet of thin film sensor flows out, and finally flows out from gas outlet.
Microprocessor unit as information processing centre and monitoring center, mainly using powerful data-handling capacity and
Control ability come realize system critical data processing and other modules real-time control, be mainly responsible for control instruction transmission,
The receiving processing of data.Microprocessor unit uses single-chip microcontroller and field programmable gate array (FPGA) for kernel control chip reality
Now to the acquisition of data and the control of each module.In device operational process, to avoid microprocessor unit from program deadlock occur
Or phenomena such as flying is run, tracked by vibration frequency and output frequency of the FPGA to quartz crystal oscillator hydrogen sensitive film sensor,
Adjustment is carried out, to the output of power supply unit to the flow control stability that three-way magnetic valve unlatches and closes the time and adjusts the speed air pump
Voltage carries out detection and carries out adjustment to the timing and acquisition rate of man-machine interaction unit.
Man-machine interaction unit mainly includes the mobile memory interface of LCD liquid crystal display, film key and USB.The display of data
And the input of human-computer interaction instruction is realized by display screen and film key, in the operation of other modules of device, first keeps in people
The instruction of machine interaction, when microprocessor unit has operational requirements, then carries out data readback, is transmitted to microprocessor unit progress
It executes；When microprocessor unit handles the measurement data of sensor well, chip is controlled by USB and directly sends data to shifting
Dynamic storage equipment stores immediately.
According to hydrogen-measuring apparatus use environment, rechargeable type, replaceable lithium electricity of the power supply unit using high capacity small size
Pond can continuously power 8 hours as power supply, lithium battery capacity 1000mAh.By integrated power supply regulated converter part,
12V DC voltage is converted into+3V ,+5V and -10V DC voltage, supplies electricity to corresponding module respectively.To guarantee hydrogen-measuring apparatus
Low power capabilities, power supply unit maintains electric current using the shutdown of 20 μ A static working currents and 1 μ A, and carries out under-voltage to battery
Monitoring, once cell voltage is lower than threshold voltage, microprocessor unit can monitor immediately, and battery low-electricity quantity signal is transmitted
To LCD display, the prompt of battery capacity deficiency is carried out.
Claims (10)
1. a kind of tomography escapes the portable quick hydrogen-measuring apparatus of gas, it is characterised in that including the first air inlet, the second air inlet, go out
Port, three-way magnetic valve, speed regulation air pump, quartz crystal oscillator hydrogen sensitive film sensor, oxygen carrier clarifier and control circuit；First air inlet
Mouthful be connected with a bite of three-way magnetic valve, two mouthfuls of three-way magnetic valve, adjust the speed air pump, quartz crystal oscillator hydrogen sensitive film sensor and out
Port passes sequentially through pipeline and is connected；Second air inlet is connected with the import of oxygen carrier clarifier, the outlet and threeway of oxygen carrier clarifier
Three mouthfuls of solenoid valve are connected, three-way magnetic valve, speed regulation air pump and quartz crystal oscillator hydrogen sensitive film sensor respectively with the control
Circuit is connected.
2. tomography according to claim 1 escapes the portable quick hydrogen-measuring apparatus of gas, it is characterised in that the quartz-crystal
Vibration hydrogen sensitive film sensor includes the cylinder housing to form cylindrical body gas chamber, and the side of cylinder housing is equipped with cylinder case
One end face of the sensor import of the setting substantially symmetrical about its central axis of body and sensor outlet, cylinder housing is equipped with quartz crystal oscillator
Piece, the center of quartz crystal are connected with first electrode, another end face of cylinder housing is equipped with surface, and to be coated with hydrogen quick thin
The induction resonance piece of film, the edge for incuding resonance piece are connected with second electrode, first electrode, second electrode respectively with the control
Circuit processed is connected.
3. tomography according to claim 2 escapes the portable quick hydrogen-measuring apparatus of gas, it is characterised in that the quartz-crystal
Vibration piece, induction resonance piece are circular piezoelectric vibrator, and the hydrogen sensitive film for being plated in induction resonance piece surface is using sol-gal process
The tungstic acid microporous membrane of the doping palladium particle of preparation, supported palladium particle in tungstic acid micropore.
4. tomography according to claim 2 or 3 escapes the portable quick hydrogen-measuring apparatus of gas, it is characterised in that the quartz
Crystal oscillator hydrogen sensitive film sensor includes signal processing circuit, and signal processing circuit includes crystal oscillating circuit and frequency detecting electricity
Road, the quartz crystal are connected by first electrode with crystal oscillating circuit, and the induction resonance piece passes through the second electricity
Pole is connected with frequency detection circuit, and crystal oscillating circuit, frequency detection circuit are connected with the governor circuit respectively.
5. tomography according to claim 1 or 2 or 3 escapes the portable quick hydrogen-measuring apparatus of gas, it is characterised in that described
Temperature sensor is equipped in quartz crystal oscillator hydrogen sensitive film sensor, temperature sensor is connected with the control circuit.
6. tomography according to claim 1 or 2 escapes the portable quick hydrogen-measuring apparatus of gas, it is characterised in that the oxygen carrier
Clarifier includes tubular shell, and the both ends of tubular shell are respectively equipped with clarifier import, clarifier outlet, are equipped in tubular shell
Hydrophobic filter membrane, the centre of hydrophobic filter membrane, which is equipped with, has porous composite reactive carbon fiber, and the inner surface load in hole has oxonium ion.
7. tomography according to claim 1 or 2 or 3 escapes the portable quick hydrogen-measuring apparatus of gas, it is characterised in that described
Control circuit includes signal processing circuit, frequency differential circuit, low-pass filtering amplifying circuit, A/D conversion circuit, microprocessor list
Member, driving unit and man-machine interaction unit and the power supply unit of operating voltage, the quartz-crystal are provided for entire hydrogen-measuring apparatus
Vibration hydrogen sensitive film sensor is connected with signal processing circuit, signal processing circuit, frequency differential circuit, low-pass filtering amplification electricity
Road, A/D conversion circuit and microprocessor unit are sequentially connected, signal processing circuit, driving unit, man-machine interaction unit respectively and
Microprocessor unit is connected, and driving unit is connected with the three-way magnetic valve, speed regulation air pump respectively.
8. a kind of monitoring method of the tomography evolution portable quick hydrogen-measuring apparatus of gas as described in claim 1, it is characterised in that
First air inlet, three-way magnetic valve, speed regulation air pump, quartz crystal oscillator hydrogen sensitive film sensor and the gas outlet is linked to be measurement gas
Road, second air inlet, three-way magnetic valve, adjust the speed air pump, quartz crystal oscillator hydrogen sensitive film sensor and go out oxygen carrier clarifier
Port is linked to be purification gas circuit；The conducting direction of the control circuit control three-way magnetic valve realizes measurement gas circuit and purification gas circuit
Switching, control circuit control speed regulation air pump work, pass through speed regulation air pump control gas circuit in gas flow velocity, quartz crystal oscillator hydrogen
The transducing signal of sensitive film sensor output is conveyed to the control circuit, is handled, shown and is stored by control circuit；
When measurement, measurement gas circuit work, sample gas is through the first air inlet and three-way magnetic valve flow direction speed regulation air pump, in the control of speed regulation air pump
Under so that sample gas is entered quartz crystal oscillator hydrogen sensitive film sensor with fixed flow rate, then through quartz crystal oscillator hydrogen sensitive film sensor from outlet
Mouth outflow, the output of quartz crystal oscillator hydrogen sensitive film sensor reflect the hydrogen transducing signal of density of hydrogen in sample gas and sense hydrogen
Signal is conveyed to the control circuit；When purification, purification gas circuit work, air flows into oxygen carrier clarifier through the second air inlet,
Purified device purification, so that oxygen-enriched few hydrogen in air, the air of oxygen-enriched few hydrogen flow to speed regulation air pump through three-way magnetic valve, adjusting the speed
Air is set to enter quartz crystal oscillator hydrogen sensitive film sensor, quartz crystal oscillator hydrogen sensitive film sensor with fixed flow rate under the control of air pump
Oxygen evolution hydrogen is quickly absorbed, achievees the purpose that purification, residual gas is flowed through quartz crystal oscillator hydrogen sensitive film sensor from gas outlet again
Out.
9. the monitoring method of the tomography evolution portable quick hydrogen-measuring apparatus of gas according to claim 8, it is characterised in that institute
The quartz crystal oscillator hydrogen sensitive film sensor stated includes the cylinder housing to form cylindrical body gas chamber, and the side of cylinder housing is equipped with
With the sensor import of the setting substantially symmetrical about its central axis of cylinder housing and sensor outlet, set on an end face of cylinder housing
There is quartz crystal, the center of quartz crystal is connected with first electrode, another end face of cylinder housing is equipped with induction
Resonance piece, the edge for incuding resonance piece are connected with second electrode；The tomography escapes the portable quick hydrogen-measuring apparatus of gas
The signal processing circuit being made of crystal oscillating circuit and frequency detection circuit, quartz crystal are shaken by first electrode and crystal
It swings circuit to be connected, induction resonance piece is connected by second electrode with frequency detection circuit, crystal oscillating circuit, frequency detection circuit
It is connected respectively with the control circuit；The monitoring method includes: by the vibration of crystal oscillating circuit control quartz crystal
Frequency is swung, the induction resonance piece that the oscillation of quartz crystal causes surface to be coated with hydrogen sensitive film resonates, hydrogen sensitive film adsorbed hydrogen
The frequency of oscillation for incuding resonance piece afterwards can change, i.e. the variation of the frequency of oscillation of induction resonance piece reflects the hydrogen in sample gas
Gas concentration, the frequency of oscillation of induction resonance piece is measured by frequency detection circuit, and is conveyed to control circuit, at control circuit
Reason and calculating, obtain the density of hydrogen in sample gas.
10. the monitoring method of the tomography evolution portable quick hydrogen-measuring apparatus of gas according to claim 9, it is characterised in that institute
Temperature sensor is equipped in the cylinder case body stated, temperature sensor is connected with the control circuit；The monitoring method
It include: crystal oscillating circuit using parallel connection type feed circuit, the AC energy that DC energy is converted into required frequency of oscillation is defeated
Quartz crystal is given, frequency of oscillation is eliminated noise caused by temperature drift using temperature-compensation method, surveyed by temperature sensor
The temperature of quartz crystal is measured, and collected temperature value is transferred to control circuit, by control circuit by collected temperature
Angle value and the temperature-compensated voltage prestored are compared, and temperature-compensated voltage data are returned to crystal oscillating circuit by calculating
Realize the temperature-compensating of frequency.
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| CN201810926066.1A CN109374732B (en) | 2018-08-14 | 2018-08-14 | Portable rapid hydrogen measuring device for fault escape gas and monitoring method thereof |
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