CN2802504Y - Soil emanometer with pressure corrector - Google Patents
Soil emanometer with pressure corrector Download PDFInfo
- Publication number
- CN2802504Y CN2802504Y CNU2005200088502U CN200520008850U CN2802504Y CN 2802504 Y CN2802504 Y CN 2802504Y CN U2005200088502 U CNU2005200088502 U CN U2005200088502U CN 200520008850 U CN200520008850 U CN 200520008850U CN 2802504 Y CN2802504 Y CN 2802504Y
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- air pressure
- soil
- emanometer
- pressure means
- soil emanometer
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Abstract
The utility model relates to a soil emanometer with an air pressure corrector, which is composed of a soil emanometer and an externally connected air pressure corrector, wherein the air pressure corrector comprises an air pressure sensor, a voltage /frequency converter, a microcontroller and an output circuit which are connected in sequence, and the input end of the air pressure sensor is connected with the air input end of a pump bowl of the soil emanometer through a three-way connector; in measuring instruments, the output circuit is switched in the signal input end of the soil emanometer. After the soil emanometer gets the result of air pressure measurement, the measurement result is corrected according to the characteristic of 'PV/T= constant' of the air in a sealing barrel to achieve the purpose that the measurement results of the soils of different air permeability are all accurate.
Description
Technical field
The utility model relates to technical field of electronic equipment, relates in particular to a kind of soil emanometer that has the air pressure means for correcting.
Background technology
Be applied to the detection of gas through regular meeting in fields such as commercial production, mining industry exploration and emergency reliefs.Active by the radon physical property, soluble in water and organic solvent, in the face of land by cluster move, deliver in relays, effect such as diffusion, convection current, suction, have very strong transfer ability.Radon can pass through rift structure, crack, underground water carrying etc. is easily migrated to the face of land by the deep, and it is unusual to form radioactive radon.Therefore often by the detection demand is satisfied in the measurement of radon.
To the unusual measurement of radon; in the forecast of uranium ore reservoir exploration, earthquake volcano, seek in all kinds of GEOLOGICAL APPLICATION field such as disaster geology monitoring such as underground water source, landslide karst collapse and the structural stability evaluation of engineering area and the field of environment protection, good prospects for application is arranged.
The groundwork principle of soil emanometer: adopt pump bowl extracting gases sample from soil, collect sheet to metal and add negative high voltage (radon first generation decay daughter approximately-2500V),
218Po (being RaA) is positively charged, is adsorbed on the sheet metal under effect of electric field.The α particle of RaA decay on the sheet metal being emitted by alpha probe converts the electric impulse signal of certain amplitude to, electric impulse signal through amplifier and discriminator after by circuit count device record.According to step-by-step counting and the proportional relation of radon concentration, the process conversion can be determined the radon concentration in the soil to be measured.
The soil of different soils type (mainly dividing four types: clay, sand, clay matter sand, sandy clay) gas penetration potential is inconsistent, and the wet clay gas penetration potential is the poorest, and husky gas penetration potential is best.When the gas penetration potential difference, the RaA soil emanometer actual inspiratory capacity deficiency (volume is less than normal) of bleeding.And existing soil emanometer always supposes that each rate of air sucked in required is identical when the conversion measurement result.Therefore cause measurement result on the low side the most at last.
The utility model content
In view of above-mentioned existing in prior technology problem, the purpose of this utility model provides a kind of soil emanometer that has the air pressure means for correcting, also air pressure means for correcting and existing radon measurement instrument can be used, reach equal purpose accurately different gas penetration potential soil surveying results.
The purpose of this utility model is achieved through the following technical solutions:
A kind of soil emanometer that has the air pressure means for correcting is made up of soil emanometer and external air pressure means for correcting; Described air pressure means for correcting comprises baroceptor, voltage/frequency transducer, microcontroller and output circuit; Baroceptor, voltage/frequency transducer, microcontroller and output circuit are linked in sequence; The baroceptor input end is connected to the inlet end of soil emanometer; Output circuit inserts the signal input part of soil emanometer.
Described baroceptor input end is provided with three-way connector, and three-way connector is located in the soil emanometer inlet end exhaust pipe.
Described output circuit also comprises display circuit.
Describedly can be LCD LCD or light-emitting nixie tube LED for display circuit.
Described electric voltage/frequency converter, the chip of employing are LM331.
It is a microcontroller MCU able to programme that described micro-control circuit adopts chip.
Described microcontroller MCU able to programme is AT89C51
The technical scheme that is provided by above-mentioned the utility model has the soil emanometer of air pressure means for correcting as can be seen, is made up of soil emanometer and external air pressure means for correcting; The air pressure means for correcting comprises baroceptor, voltage/frequency transducer, microcontroller and output circuit; Baroceptor, voltage/frequency transducer, microcontroller and output circuit are linked in sequence; The baroceptor input end is connected to the inlet end of soil emanometer pump bowl by three-way connector; In the surveying instrument, output circuit inserts the signal input part of soil emanometer.After soil emanometer obtains the barometric surveying result,, measurement result is proofreaied and correct according to the characteristic of gas in the sealing bore " PV/T=measurement ".Reach equal purpose accurately in different gas permeability soil surveying result.
Description of drawings
Fig. 1 is a schematic block circuit diagram of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
Embodiment described in the utility model is made up of soil emanometer and external air pressure means for correcting; Described air pressure means for correcting is as shown in Figure 1: comprise baroceptor, voltage/frequency transducer, microcontroller and output circuit; Baroceptor, voltage/frequency transducer, microcontroller and output circuit are linked in sequence; The baroceptor input end is connected to the inlet end of soil emanometer; Output circuit inserts the signal input part of soil emanometer.
The baroceptor input end is provided with three-way connector, and three-way connector is located in the soil emanometer inlet end exhaust pipe.
Described output circuit also comprises display circuit.Display circuit can be LCD LCD or light-emitting nixie tube LED.
Described electric voltage/frequency converter, the voltage/frequency conversion chip of employing is LM331.
It is a microcontroller MCU able to programme that described micro-control circuit adopts chip, and concrete chip model is AT89C51
The circuit structure of the soil emanometer that has an air pressure means for correcting described in the utility model is as shown in Figure 2:
U1 is a baroceptor, and U2 is voltage/frequency transducer LM331, and U3 is microcontroller AT89C51, and U4 is the LCD display circuit.
The Sout interface of U1 connects the 7th pin of U2; Other pin of not mentioning connects by the conventional connection of this chip
The 3rd pin of U2 connects the T1 pin of U3; Other pin of not mentioning connects by the conventional connection of this chip.
The P00 of U3, P01, P02, P03, P04, P05, P06 and eight pin of P07 connect DB0, BD1, DB2, DB3, DB4, DB5, DB6 and eight pin of DB7 of U4 respectively by a data line; The P20 pin of U3 connects the E pin of U4; The P21 pin of U3 connects the R/W pin of U4; The P22 pin of U3 connects the RS pin of U4; The RxD of U3 and TxD signal attachment plug CON1 are used for atmospheric pressure value is exported to soil emanometer; Other pin of not mentioning connects by the conventional connection of this chip.
The pin that other of U4 do not mentioned connects by the conventional connection of this chip.
Its circuit working is reasonable as follows:
Three-way connector is introduced the air pressure in the pump bowl of emanometer in the baroceptor, the voltage signal that the baroceptor output amplitude is directly proportional with input air pressure.This voltage signal imports the voltage/frequency transducer into.
The voltage/frequency conversion chip of voltage/frequency converter using is LM331.LM331 is the higher integrated chip of the ratio of performance to price that U.S. NS company produces, and can be used as precise frequency electric pressure converter, A/D converter, linear frequency modulation, long-time integration device and other associated components.LM331 has adopted new temperature compensation energy gap reference circuit, under the 4.0V supply voltage high precision is arranged all with low in whole operating temperature range.The wide dynamic range of LM331 can reach 100dB; The linearity is good, and maximum nonlinear distortion is less than 0.01%, and frequency of operation is low to have better linearity to 0.1Hz fashion; Conversion precision height, digital resolution can reach 12; External circuits is simple, only needs to insert several outer members and just can conveniently constitute translation circuits such as V/F or F/V, and guarantee conversion accuracy easily.
Voltage signal is through the voltage/frequency transducer, output be the frequency signal that frequency is directly proportional with input voltage.Microcontroller is measured this frequency signal by built-in Timer.
Microcontroller adopts MCU chip AT89C51 able to programme.But overprogram flash memory with 4kB, the operating voltage range of 4V～6V, the internal RAM of 128Byte and 4 I/O mouths (P0, P1, P2, P3), counter/timer and six interrupt sources of two 16, and can directly drive LCD output, have programmable serial communication interface simultaneously.
Microcontroller is finished measuring of voltage to frequency converter output frequency signal by the internal timing counter, and will measure the direct output pressure value of computing, exports to soil emanometer.Can also control the LCD display circuit shows the barometric surveying result.
The correction principle that obtains behind the barometric surveying result is as follows: according to the characteristic of gas in the sealing bore " PV/T=measurement ", again because temperature is consistent substantially in pumping process, so (wherein P1, V1, P2, V2 are respectively sealing gas by the pressure and the volume of the thin front and back of vacuate to P1V1=P2V2, be that V1 is the actual volume of bleeding, and P1 also is an atmospheric pressure).Therefore, the actual volume of bleeding can be proofreaied and correct (being V1=V2P2/P1) with pressure, reaches equal purpose accurately in different gas permeability soil surveying result.
The above; it only is the preferable embodiment of the utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.
Claims (7)
1, a kind of soil emanometer that has the air pressure means for correcting is made up of soil emanometer and external air pressure means for correcting; It is characterized in that described air pressure means for correcting comprises baroceptor, voltage/frequency transducer, microcontroller and output circuit; Baroceptor, voltage/frequency transducer, microcontroller and output circuit are linked in sequence; The baroceptor input end is connected to the inlet end of soil emanometer; Output circuit inserts the signal input part of soil emanometer.
2, the soil emanometer that has the air pressure means for correcting according to claim 1 is characterized in that, described baroceptor input end is provided with three-way connector, and three-way connector is located in the soil emanometer inlet end exhaust pipe.
3, the soil emanometer that has the air pressure means for correcting according to claim 1 is characterized in that, described output circuit also comprises display circuit.
4, according to claim 1 or the 3 described soil emanometers that have the air pressure means for correcting, it is characterized in that, describedly can be LCD LCD or light-emitting nixie tube LED for display circuit.
5, the soil emanometer that has the air pressure means for correcting according to claim 1 is characterized in that, described electric voltage/frequency converter, the chip of employing are LM331.
6, the soil emanometer that has the air pressure means for correcting according to claim 1 is characterized in that, it is a microcontroller MCU able to programme that described micro-control circuit adopts chip.
7, the soil emanometer that has the air pressure means for correcting according to claim 6 is characterized in that, described microcontroller MCU able to programme is AT89C51.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200088502U CN2802504Y (en) | 2005-03-21 | 2005-03-21 | Soil emanometer with pressure corrector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200088502U CN2802504Y (en) | 2005-03-21 | 2005-03-21 | Soil emanometer with pressure corrector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2802504Y true CN2802504Y (en) | 2006-08-02 |
Family
ID=36847212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2005200088502U Expired - Fee Related CN2802504Y (en) | 2005-03-21 | 2005-03-21 | Soil emanometer with pressure corrector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2802504Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106970409A (en) * | 2017-05-17 | 2017-07-21 | 成都理工大学 | The γ absorbed dose rates instrument corrected with soil moisture and bearing calibration |
-
2005
- 2005-03-21 CN CNU2005200088502U patent/CN2802504Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106970409A (en) * | 2017-05-17 | 2017-07-21 | 成都理工大学 | The γ absorbed dose rates instrument corrected with soil moisture and bearing calibration |
| CN106970409B (en) * | 2017-05-17 | 2023-08-25 | 成都理工大学 | Gamma absorption dose rate instrument with soil humidity correction function and correction method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |