CN107290024A - A kind of radio frequency admittance level-sensing device with anti-jamming circuit - Google Patents
A kind of radio frequency admittance level-sensing device with anti-jamming circuit Download PDFInfo
- Publication number
- CN107290024A CN107290024A CN201610200649.7A CN201610200649A CN107290024A CN 107290024 A CN107290024 A CN 107290024A CN 201610200649 A CN201610200649 A CN 201610200649A CN 107290024 A CN107290024 A CN 107290024A
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- output
- radio frequency
- oscillator
- frequency admittance
- sensor
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
Abstract
The invention belongs to the field of measuring technique of fluid bed material position in uranium conversion production, and in particular to a kind of radio frequency admittance level-sensing device with anti-jamming circuit.The difference of radio frequency admittance technology with conventional radio frequency admittance technology used is the end of sensor three driving shield technology and increase high precision oscillator drive circuit in the radio frequency admittance continuous material level meter this time developed, these are improved according to actual working condition requirement and using experience, can solve the problems, such as connection cable shielding and temperature drift.
Description
Technical field
The invention belongs to the field of measuring technique of fluid bed material position in uranium conversion production, and in particular to one kind has anti-interference
The radio frequency admittance level-sensing device of circuit.
Background technology
UF in fluid bed in the hydrofluorination process of uranium conversion production4The measurement of material position is a problem, and main cause is except survey
Measure environment complicated, high temperature (500 DEG C), deep-etching (hydrofluoric acid), in addition due also to material position is in fluidized state, interface is unclear, shake
It is dynamic larger, so extremely difficult to level gauging way choice.The field control of secondary bed material position in hydrofluorination process system
Be that whole production system is normal, one of the continuous, key factor of stable operation, but due to inside secondary bed by high temperature and hydrofluoric acid
Burn into vibrates big limitation, and for a long time, secondary bed material-level measure technology is constantly in space state.
Used method was once selected to have capacitance level meter, gamma-ray level indicator, difference gauge to measure.Capacitance charge level
Material sticks in production process, which often occurs, in meter on feeler lever, causes measurement capacitance to change, and causes measurement is inaccurate to show
As.Gamma-ray level indicator is measured because medium fluidisation is without obvious interface in fluid bed, and measurement error is bigger than normal.Difference gauge
Measure using double flange measurements, but pressure measurement diaphragm can not bear high temperature and strong acid corrosion than relatively thin.
Radio frequency admittance material level e measurement technology is more advanced, there is wide application.The implication of " admittance " in radio frequency admittance is
The inverse of electricity middle impedance, it is integrated and formed by resistive composition, electric capacity sexual element, perceptual composition, and " radio frequency " is high frequency radio
Ripple, so radio frequency admittance technology can be understood as using high frequency radio wave measurement admittance, high frequency sinusoidal swings device and exports a stabilization
Measurement signal source, using electrical bridge principle, the admittance on the sensor in testing container is arranged on accurate measurement, is directly being made
Increased with the output of instrument under pattern with the rise of thing position.But traditional radio frequency admittance material level e measurement technology can not solve cable
The problem of shielding, temperature drift and big vibration, therefore need badly by improving the radio frequency admittance developed under suitable uranium conversion complex environment
Level gauging new technology.
The content of the invention
The technical problem to be solved in the present invention is the measurement scheme by developing secondary bed material position, develops fluid bed radio frequency
Admittance level-sensing device, solves reaction temperature height, and the vibration of hydrofluoric acid burn into is big to wait influence.
In order to realize this purpose, the present invention is adopted the technical scheme that：
Fluidized in a kind of radio frequency admittance level-sensing device with anti-jamming circuit, the hydrofluorination process that production is converted applied to uranium
UF in bed4The measurement of material position, wherein：
(1) oscillator supply temperature-compensation circuit
The temperature characterisitic of oscillator is improved by oscillator supply temperature-compensation circuit, excited oscillation signal stabilization is improved
Property；
Input power VCC1 is connected in series on energy gap type a reference source V1LM185 by current-limiting resistance R1, passes through energy gap type benchmark
Source V1LM185 is by input power VCC1 voltage stabilization；Energy gap type a reference source V1LM185 work is controlled by current-limiting resistance R1
Electric current is in the range of default；
Operational amplifier YF3 positive input terminal is connected with energy gap type a reference source V1LM185 output, operational amplifier YF3
Negative input end be grounded by grounding resistance R2；Grounding resistance R2 effect is the multiplication factor for adjusting operational amplifier YF3；
Operational amplifier YF3 output is divided into two parts, and a part is electric by the thermo-sensitive resistor RT4 and feedback being sequentially connected in series
Resistance R3 feeds back to operational amplifier YF3 negative input end, and another part is connected to out-put supply VCC2；The filtered electrical of out-put supply
Hold C1 to connect with out-put supply VCC2；
(2) signal interference and temperature drift problem are eliminated
Increase oscillator driver YF1 between oscillator and sampling electric bridge, the signal output of oscillator is driven to oscillator
Dynamic device YF1 positive input terminal, an oscillator driver YF1 output signal part is output in sampling electric bridge, and another part enters
Enter oscillator driver YF1 negative input end as its feedback signal；The energy for making consumption by oscillator driver is mended
Fill, the stable oscillating voltage for being added in sensor；
Sensor is connected in circuit by coaxial cable shield end, coax cable center end and sensor ground terminal；
An output signal part for sampling electric bridge is output to coax cable center end, and determinand electricity is measured by sensor
Hold；
The other end of coaxial cable shield is connected on center sensor end；
An output signal part for sampling electric bridge is connected to from the output starting point of sampling electric bridge follows type drive circuit
In, follow the output end of type drive circuit to be connected to coaxial cable shield end；
Sensor ground terminal is an independent cable grounding.
Further, a kind of radio frequency admittance level-sensing device with anti-jamming circuit as described above, follows type driving electricity
Lu Zhong, an output signal part for electric bridge of sampling is connected to the just defeated of in-phase amplifier YF2 from the output starting point of sampling electric bridge
Enter end, an in-phase amplifier YF2 output signal part is output to coaxial cable shield end, and another part enters in-phase amplifier
YF2 negative input end is used as its feedback signal.
Further, a kind of radio frequency admittance level-sensing device with anti-jamming circuit as described above, follows type driving electricity
Lu Zhong, in-phase amplifier YF2 are the high precision operating amplifiers of modern low noise low excursion with temperature.
Further, a kind of radio frequency admittance level-sensing device with anti-jamming circuit as described above, 100~200K of R1 ∈
Ω；R2 30~60K of ∈ Ω；R3 120~160K of ∈ Ω；R4 1~5K of ∈ Ω.
The beneficial effect of technical solution of the present invention is：Radio frequency used in the radio frequency admittance continuous material level meter this time developed
The difference of admittance technology and conventional radio frequency admittance technology is the end of sensor three driving shield technology and increase high precision oscillator
Drive circuit, these are improved according to actual working condition requirement and using experience, can solve connection cable shielding
With temperature drift problem.
Brief description of the drawings
Fig. 1 is oscillator supply temperature-compensation circuit sketch；
Fig. 2 is that the circuit between oscillator and sampling electric bridge is shown in figure；
The secondary bed material position change curve that Fig. 3 is surveyed by different period model machines.
In figure：VCC1 input powers, VCC2 out-put supplies, R1 current-limiting resistances, R2 grounding resistances, R3 feedback resistances, RT4 temperature
Quick resistance, YF3 operational amplifiers, the filter capacitor of C1 out-put supplies, 1 oscillator, 2 sampling electric bridges, 3 coaxial cable shield ends, 4
Coax cable center end, YF1 oscillator drivers, YF2 follows type drive circuit, CX determinand electric capacity, GND.
Embodiment
Technical solution of the present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
A kind of radio frequency admittance level-sensing device with anti-jamming circuit of the present invention, the hydrofluorination process of production is converted applied to uranium
UF in middle fluid bed4The measurement of material position, wherein：
As shown in Figure 1：The temperature characterisitic of oscillator is improved by oscillator supply temperature-compensation circuit, excited oscillation is improved
Signal stabilization；
Input power VCC1 is connected in series on energy gap type a reference source V1LM185 by current-limiting resistance R1, passes through energy gap type benchmark
Source V1LM185 is by input power VCC1 voltage stabilization；Energy gap type a reference source V1LM185 work is controlled by current-limiting resistance R1
Electric current is in the range of default；
Operational amplifier YF3 positive input terminal is connected with energy gap type a reference source V1LM185 output, operational amplifier YF3
Negative input end be grounded by grounding resistance R2；Grounding resistance R2 effect is the multiplication factor for adjusting operational amplifier YF3；
Operational amplifier YF3 output is divided into two parts, and a part is electric by the thermo-sensitive resistor RT4 and feedback being sequentially connected in series
Resistance R3 feeds back to operational amplifier YF3 negative input end, and another part is connected to out-put supply VCC2；The filtered electrical of out-put supply
Hold C1 to connect with out-put supply VCC2.
In the present embodiment, 100~200K of R1 ∈ Ω；R2 30~60K of ∈ Ω；R3 120~160K of ∈ Ω；1~5K of R4 ∈
Ω.Operational amplifier YF3 multiplication factor=(1+R3+RT4)/R2.
To the container of an electric conductivity material, because material is conductive, earth point may be considered that in sensor insulation
Layer surface, be showed only as gauge sensor one it is purely capacitive, with vessel discharge, bridging is produced on sensor, and
Bridging is that tool is resistive.Purely capacitive the composite impedance being made up of electric capacity and resistance has been reformed into before so.Material is in itself
To equivalent to one electric capacity of sensor, it does not consume the energy of transmitter, (purely capacitive not consume energy), but bridging is equivalent to sensor
Contain resistance in circuit, then the impedance meeting consumed energy of bridging, so that oscillator voltage be pulled down, causes bridge output to change
Become, produce measurement error.Therefore, as shown in Fig. 2 increasing oscillator driver YF1, vibration between oscillator and sampling electric bridge
The signal output of device is to oscillator driver YF1 positive input terminal, and an oscillator driver YF1 output signal part is output to
Sample in electric bridge, the negative input end that another part enters oscillator driver YF1 is used as its feedback signal；Pass through oscillator drives
Device is supplemented the energy of consumption, the stable oscillating voltage for being added in sensor.
Sensor is connected in circuit by coaxial cable shield end, coax cable center end and sensor ground terminal；Sampling
An output signal part for electric bridge is output to coax cable center end, and determinand electric capacity is measured by sensor；Coaxial cable screen
The other end covered is connected on center sensor end.
An output signal part for sampling electric bridge is connected to from the output starting point of sampling electric bridge follows type drive circuit
In, follow the output end of type drive circuit to be connected to coaxial cable shield end；In the present embodiment, type drive circuit is followed
In, an output signal part for electric bridge of sampling is connected to in-phase amplifier YF2 positive input from the output starting point of sampling electric bridge
End, an in-phase amplifier YF2 output signal part is output to coaxial cable shield end, and another part enters in-phase amplifier
YF2 negative input end is used as its feedback signal.What in-phase amplifier YF2 was specifically selected is the height of modern low noise low excursion with temperature
Precision calculating amplifier.
The effect connected according to foregoing circuit is equivalent to it is " 1 ", driving that the output signal of sampling electric bridge, which passes through a gain,
Very capable in-phase amplifier, its output is connected with coaxial cable shield end, and sensor ground terminal is that an independent cable connects
Ground.Due to there is above-mentioned relation between coax cable center end and coaxial circuit shielding end, so therebetween without potential difference,
Also no electric current is flowed through, i.e., no electric current is spilt from coax cable center end, equivalent to therebetween without electric capacity or electricity
Hold and be equal to zero.Therefore the temperature effect of cable, installation electric capacity etc. would not also produce influence.
By having carried out on-line examination experiment to the accuracy that model machine is measured in fluid bed production line, Fig. 3 for it is different when
Between the secondary bed material position change curve surveyed of section model machine.From curve as can be seen that normally producing under fluidized state, secondary bed material
Position change big rise and fall, can reflect material situation of change substantially.
Claims (4)
1. a kind of radio frequency admittance level-sensing device with anti-jamming circuit, fluid bed in the hydrofluorination process of production is converted applied to uranium
Interior UF4The measurement of material position, it is characterised in that：
(1) oscillator supply temperature-compensation circuit
The temperature characterisitic of oscillator is improved by oscillator supply temperature-compensation circuit, excited oscillation signal stabilization is improved；
Input power VCC1 is connected in series on energy gap type a reference source V1LM185 by current-limiting resistance R1, passes through energy gap type a reference source
V1LM185 is by input power VCC1 voltage stabilization；Energy gap type a reference source V1LM185 work electricity is controlled by current-limiting resistance R1
Stream is in the range of default；
Operational amplifier YF3 positive input terminal is connected with energy gap type a reference source V1LM185 output, and operational amplifier YF3's is negative
Input is grounded by grounding resistance R2；Grounding resistance R2 effect is the multiplication factor for adjusting operational amplifier YF3；
Operational amplifier YF3 output is divided into two parts, and a part passes through the thermo-sensitive resistor RT4 and feedback resistance R3 being sequentially connected in series
Operational amplifier YF3 negative input end is fed back to, another part is connected to out-put supply VCC2；The filter capacitor C1 of out-put supply
Connected with out-put supply VCC2；
(2) signal interference and temperature drift problem are eliminated
Increase oscillator driver YF1, the signal output of oscillator to oscillator driver between oscillator and sampling electric bridge
YF1 positive input terminal, an oscillator driver YF1 output signal part is output in sampling electric bridge, and another part, which enters, to shake
Device driver YF1 negative input end is swung as its feedback signal；The energy for making consumption by oscillator driver is supplemented, surely
Surely it is added in the oscillating voltage of sensor；
Sensor is connected in circuit by coaxial cable shield end, coax cable center end and sensor ground terminal；
An output signal part for sampling electric bridge is output to coax cable center end, and determinand electric capacity is measured by sensor；
The other end of coaxial cable shield is connected on center sensor end；
Sample electric bridge an output signal part from the output starting point of sampling electric bridge is connected to and follows type drive circuit, with
Coaxial cable shield end is connected to the output end of type drive circuit；
Sensor ground terminal is an independent cable grounding.
2. a kind of radio frequency admittance level-sensing device with anti-jamming circuit as claimed in claim 1, it is characterised in that：Follow type
In drive circuit, an output signal part for electric bridge of sampling is connected to in-phase amplifier YF2 from the output starting point of sampling electric bridge
Positive input terminal, an in-phase amplifier YF2 output signal part is output to coaxial cable shield end, and another part enters same phase
Amplifier YF2 negative input end is used as its feedback signal.
3. a kind of radio frequency admittance level-sensing device with anti-jamming circuit as claimed in claim 2, it is characterised in that：Follow type
In drive circuit, in-phase amplifier YF2 is the high precision operating amplifier of modern low noise low excursion with temperature.
4. a kind of radio frequency admittance level-sensing device with anti-jamming circuit as claimed in claim 1, it is characterised in that：R1∈100
~200K Ω；R2 30~60K of ∈ Ω；R3 120~160K of ∈ Ω；R4 1~5K of ∈ Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610200649.7A CN107290024A (en) | 2016-03-31 | 2016-03-31 | A kind of radio frequency admittance level-sensing device with anti-jamming circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610200649.7A CN107290024A (en) | 2016-03-31 | 2016-03-31 | A kind of radio frequency admittance level-sensing device with anti-jamming circuit |
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| Publication Number | Publication Date |
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| CN107290024A true CN107290024A (en) | 2017-10-24 |
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ID=60087374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610200649.7A Pending CN107290024A (en) | 2016-03-31 | 2016-03-31 | A kind of radio frequency admittance level-sensing device with anti-jamming circuit |
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| CN (1) | CN107290024A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108267194A (en) * | 2017-12-25 | 2018-07-10 | 北京航天计量测试技术研究所 | The device of level gauging is carried out under a kind of high temperature and pressure radiation environment |
| CN110057424A (en) * | 2019-06-04 | 2019-07-26 | 南华大学 | Air-cooled passive nuclear level sensing device and its measurement method |
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| CN2624193Y (en) * | 2003-05-06 | 2004-07-07 | 北京莱姆电子有限公司 | Temperature compensation circuit |
| CN2791621Y (en) * | 2004-08-17 | 2006-06-28 | 台湾矽微电子股份有限公司 | Digital pressure gauge with temperature compensating function |
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| CN101656511A (en) * | 2009-09-04 | 2010-02-24 | 惠州市正源微电子有限公司 | Temperature compensating circuit of radio frequency power amplifier |
| CN102253503A (en) * | 2011-04-12 | 2011-11-23 | 浙江大学 | Temperature compensation method for half-wave voltage of integrated electro-optical phase modulator |
| CN102680776A (en) * | 2012-05-08 | 2012-09-19 | 中国科学院空间科学与应用研究中心 | Wide-range logarithmic micro-current detection circuit |
| CN104373980A (en) * | 2014-10-28 | 2015-02-25 | 浙江帅康电气股份有限公司 | Pressure sensitive touch type keying operation range hood |
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2016
- 2016-03-31 CN CN201610200649.7A patent/CN107290024A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2624193Y (en) * | 2003-05-06 | 2004-07-07 | 北京莱姆电子有限公司 | Temperature compensation circuit |
| CN2791621Y (en) * | 2004-08-17 | 2006-06-28 | 台湾矽微电子股份有限公司 | Digital pressure gauge with temperature compensating function |
| CN201251468Y (en) * | 2008-09-01 | 2009-06-03 | 黄战鹏 | Two-wire anti-hanging continuous radio frequency admittance controller |
| CN201382921Y (en) * | 2009-03-13 | 2010-01-13 | 郑州创威煤安科技有限公司 | Gas detection device |
| CN101656511A (en) * | 2009-09-04 | 2010-02-24 | 惠州市正源微电子有限公司 | Temperature compensating circuit of radio frequency power amplifier |
| CN102253503A (en) * | 2011-04-12 | 2011-11-23 | 浙江大学 | Temperature compensation method for half-wave voltage of integrated electro-optical phase modulator |
| CN102680776A (en) * | 2012-05-08 | 2012-09-19 | 中国科学院空间科学与应用研究中心 | Wide-range logarithmic micro-current detection circuit |
| CN104373980A (en) * | 2014-10-28 | 2015-02-25 | 浙江帅康电气股份有限公司 | Pressure sensitive touch type keying operation range hood |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108267194A (en) * | 2017-12-25 | 2018-07-10 | 北京航天计量测试技术研究所 | The device of level gauging is carried out under a kind of high temperature and pressure radiation environment |
| CN110057424A (en) * | 2019-06-04 | 2019-07-26 | 南华大学 | Air-cooled passive nuclear level sensing device and its measurement method |
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Application publication date: 20171024 |
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