CN201327381Y - Observation device for stress-strain of soil layers - Google Patents
Observation device for stress-strain of soil layers Download PDFInfo
- Publication number
- CN201327381Y CN201327381Y CNU200820124775XU CN200820124775U CN201327381Y CN 201327381 Y CN201327381 Y CN 201327381Y CN U200820124775X U CNU200820124775X U CN U200820124775XU CN 200820124775 U CN200820124775 U CN 200820124775U CN 201327381 Y CN201327381 Y CN 201327381Y
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- strain
- electric bridge
- chip
- observation device
- digital regulation
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Abstract
The utility model discloses an observation device for the stress-strain of soil layers. The observation device comprises four groups of strain foil and circuit boards for measuring the changes of four directions, wherein, the circuit boards are provided with signal conversion circuits; a low power consumption single-chip computer is adopted as a controller for controlling an integral system; the signal conversion circuits adopt the strain foil as two bridge arms of an electric bridge; digital potentiometers are used as another two bridge arms of the electric bridge; the strain foil and the digital potentiometers form the double-arm electric bridge; two output terminals of the electric bridge are connected with the input terminal of a data conversion chip; the low power consumption single-chip computer controls and adjusts the positions of middle taps of the digital potentiometers so as to control the output of the electric bridge within a certain range; and Rx signals and Tx signals of the low power consumption single-chip computer are level-switched to Rs-232 signals through the chip MAX3221 so as to communicate with an upper computer. The utility model has a large measuring range, high resolution and low power consumption, and can be applied to the observation of the stress-strain and the like of the soil layers and drilling in earthquake precursor observation.
Description
Technical field
The utility model relates to a kind of measurement mechanism, particularly a kind of soil layer stress-strain observation device.
Background technology
A kind of TC-4 type boring formula soil layer stress ga(u)ge is arranged at present, with a long stainless steel cylinder as flexible member, be commonly called as and be probe, be embedded in the dark soil layer of several meters or tens of rice, the strain of soil layer or the variation of stress state, the area or the shape of elasticity tube are changed, and the strain regime of inwall also can respective change.The resistance bridge mode that is adopted at TC-4 type boring formula four component soil layer stress ga(u)ges, if sensor reaches stress sensitivity: 1hPa (0.1 millibar), enlargement factor in electric bridge output must reach 20 times so, and the range of sensor also just reduces 20 times simultaneously.If range has been pointed out in the work of sensor, need reinstall, or adopt lowering apparatus sensitivity to obtain big range mode.Also do not have in the prior art a kind ofly can realize wide range, have high-resolution soil layer stress-strain observation device again.
Summary of the invention
The utility model provides a kind of have wide range and high-resolution soil layer stress-strain observation device in order to solve the deficiencies in the prior art.
The technical scheme that its technical matters that solves the utility model adopts is: a kind of soil layer stress-strain observation device, comprise 4 groups of foil gauges that are installed in the stainless steel cylinder, also comprise the circuit board that links to each other with every group of foil gauge, described circuit board is provided with signal conversion circuit, and adopt low-power scm to be used for controlling total system as controller, described signal conversion circuit adopts two brachium pontis of foil gauge as electric bridge, digital regulation resistance is as two other brachium pontis of electric bridge, described foil gauge and digital regulation resistance are formed a complete double bridge, described electric bridge output terminal links to each other with data-switching chip input end, the tapped position of described low-power scm regulating and controlling digital regulation resistance is controlled within limits the output of electric bridge, the TX of described low-power scm, the RX signal carries out level conversion by chip MAX3221 and becomes the RS-232 signal, communicates by letter with host computer.
Described low-power scm is the MSP430F2274 single-chip microcomputer.
Described data-switching chip is the ADS1243 chip.
Described digital regulation resistance is the MAX5481 digital regulation resistance.
Described digital regulation resistance and data-switching chip adopt the SPI interface to communicate.
Compared with prior art, the utility model adopts two brachium pontis of digital regulation resistance as electric bridge, form a double bridge with two brachium pontis of foil gauge resistance, the output of the electric bridge signal as the input of amplifier is amplified, make the electric bridge output signal amplify 128 times and undistorted by adjusting the tapped position of digital regulation resistance, reach the sensitivity that can guarantee the soil layer strain transducer, has big range again, and can regulate automatically, has high precision, low-power consumption, numeral output, the advantage that sampling rate is high, effect is highly profitable for the long-continued signal that requires in the earthquake precursor observation.Can be applicable in the observations such as soil layer, borehole strain-stress in the earthquake precursor observation.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is the A-A cut-open view of Fig. 1;
Fig. 3 is a part of circuit theory diagrams of the present utility model;
Fig. 4 is another part circuit theory diagrams of the present utility model.
Among the figure: 1. skin bronze flake, 2. foil gauge, 3. circuit board, 4. stainless steel cylinder.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
Referring to Fig. 1 and Fig. 2, four skin bronze flake 1 that are pasted with foil gauge 2 respectively are installed in the inside of stainless steel cylinder 4, are in miter angle, measure 4 diametric variations.Each foil gauge 2 is connected with circuit board 3 by 3 lines, and wherein two is power lead, and one is signal wire.
Referring to Fig. 3,2 pin of plug J1-J4 connector scoop out the output that becomes sheet resistance; MAX5481 is digital regulation resistance (U1-U4), has used 4, two termination power supplys of potentiometer and ground, and tapped signal connects the amp.in of ADS1243 (U5) after by filtering; ADS1243 is the analog to digital conversion chip, and this chip has 8 road input signals, forms differential signal for two one group and amplifies, and enlargement factor 1-128 doubly; 42 pin that meet J1-J4 wherein; Other 4 connect MAX5481 digital regulation resistance output signal; Din and SCLK are spi bus, RC_S1, and RC_S2, RC_S3, RC_S4, CS_AD are chip selection signal, produce control by MSP430F2274 (U6).
Referring to Fig. 4, U6 is the MSP430F2274 single-chip microcomputer, and system controls by it; U8 is the MAX3221 chip, mainly is level conversion, produces the RS-232C signal; J6, J7 is a connector, does programming and uses.
Principle of work of the present utility model:
4 foil gauges can be experienced the strain regime of the inner different directions of elasticity tube respectively.When the interior strain regime of soil layer or stress state time to time change, the resistance value of 4 groups of foil gauges also changes thereupon.Thus can be by the relevant formula of Elasticity, change by the measured value of 4 elements, calculate the strain regime in the soil layer or relative variation (major principal stress, the least principal stress of stress state by simultaneous equations, the position angle of major principal stress, three unknown numbers).
Four foil gauge resistance value are about 1000 ohm, and the circumferencial direction of two slice, thin pieces along the elasticity tube arranged, and as " active gage ", its resistance value is along with the variation of ambient pressure changes; Two slice, thin pieces in addition then are to paste along the direction of diameter, and it and ambient pressure are irrelevant substantially; Its resistance value is constant substantially, just for responsive to temperature, to offset the temperature effect of active gage, is called " compensating plate ".Circuit board is provided with signal conversion circuit, signal conversion circuit adopts two brachium pontis of digital regulation resistance MAX5481 as electric bridge, MAX5481 is added with 3.3 volts of voltages, electric bridge output is imported as AD converter (ADS1243), utilize the inside differential amplifier circuit (enlargement factor 1-128 doubly) of data-switching chip ADS1243 that strain signal is amplified, signal is touched number conversion after amplifying, adopted low-power scm MSP430F2274 as controller in the circuit, adopt SPI interface and digital regulation resistance MAX5481 and ADS1243 to communicate, MSP430F2274 output is carried out level conversion by MAX3221 and is become the output of RS-232 signal, communicate by letter with host computer, entire circuit is 3.3 volts of power supplies.If the strain signal variable quantity is big, the centre tap that MSP430F2274 adjusts digital regulation resistance by the SPI mouth is adjusted the output of potentiometer, makes strain signal within the working range of amplifier.This device can keep big working range (range is constant) on the one hand; Can guarantee high enlargement factor on the other hand and signal amplitude limit not, guarantee the resolution that strain signal is measured.The measurement of sensor is transferred to the host computer storage by RS-232C at last, realizes communicating by letter to sensor with host computer.
Above-described embodiment, the utility model embodiment a kind of more preferably just, the common variation that those skilled in the art carries out in the technical solutions of the utility model scope and replacing all should be included in the protection domain of the present utility model.
Claims (5)
1, a kind of soil layer stress-strain observation device, comprise 4 groups of foil gauges that are installed in the stainless steel cylinder, it is characterized in that, also comprise the circuit board that links to each other with every group of foil gauge, described circuit board is provided with signal conversion circuit, and adopt low-power scm to be used for controlling total system as controller, described signal conversion circuit adopts two brachium pontis of foil gauge as electric bridge, digital regulation resistance is as two other brachium pontis of electric bridge, described foil gauge and digital regulation resistance are formed a complete double bridge, two output terminals of described electric bridge link to each other with data-switching chip input end, the tapped position of described low-power scm regulating and controlling digital regulation resistance is controlled within limits the output of electric bridge, the TX of described low-power scm, the RX signal carries out level conversion by chip MAX3221 and becomes the RS-232 signal, communicates by letter with host computer.
2, soil layer stress-strain observation device according to claim 1 is characterized in that, described low-power scm is the MSP430F2274 single-chip microcomputer.
3, soil layer stress-strain observation device according to claim 1 is characterized in that, described data-switching chip is the ADS1243 chip.
4, soil layer stress-strain observation device according to claim 1 is characterized in that, described digital regulation resistance is the MAX5481 digital regulation resistance.
According to each described soil layer stress-strain observation device of claim 1 to 4, it is characterized in that 5, described digital regulation resistance and data-switching chip adopt the SPI interface to communicate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820124775XU CN201327381Y (en) | 2008-12-18 | 2008-12-18 | Observation device for stress-strain of soil layers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820124775XU CN201327381Y (en) | 2008-12-18 | 2008-12-18 | Observation device for stress-strain of soil layers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201327381Y true CN201327381Y (en) | 2009-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200820124775XU Expired - Fee Related CN201327381Y (en) | 2008-12-18 | 2008-12-18 | Observation device for stress-strain of soil layers |
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| CN (1) | CN201327381Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095533A (en) * | 2010-12-09 | 2011-06-15 | 南京大学 | Three-dimensional stress measuring device in geologic structure simulated experiment |
| CN105242303A (en) * | 2015-09-17 | 2016-01-13 | 曾雄飞 | Element for receiving mechanics information of earth's crust |
-
2008
- 2008-12-18 CN CNU200820124775XU patent/CN201327381Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095533A (en) * | 2010-12-09 | 2011-06-15 | 南京大学 | Three-dimensional stress measuring device in geologic structure simulated experiment |
| CN105242303A (en) * | 2015-09-17 | 2016-01-13 | 曾雄飞 | Element for receiving mechanics information of earth's crust |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: INSTITUTE OF CRUSTAL DYNAMICS, CHINA EARTHQUAKE AD Free format text: FORMER OWNER: LI HAILIANG Effective date: 20101208 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 100085 THE INSTITUTE OF CRUSTAL DYNAMICS, XISANQI, HAIDIAN DISTRICT, BEIJING TO: 100085 NO.1, ANNINGZHUANG ROAD, HAIDIAN DISTRICT, BEIJING |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20101208 Address after: 100085, Anning Road, Beijing, Haidian District, No. 1 Patentee after: Institute of Crustal Dynamics, China Earthquake Administration Address before: 100085 Xisanqi crustal Institute of Beijing, Haidian District Patentee before: Li Hailiang |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091014 Termination date: 20111218 |