CN2684149Y - Differential vibratory string type inclinometer - Google Patents
Differential vibratory string type inclinometer Download PDFInfo
- Publication number
- CN2684149Y CN2684149Y CN 03259906 CN03259906U CN2684149Y CN 2684149 Y CN2684149 Y CN 2684149Y CN 03259906 CN03259906 CN 03259906 CN 03259906 U CN03259906 U CN 03259906U CN 2684149 Y CN2684149 Y CN 2684149Y
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- CN
- China
- Prior art keywords
- vibratory
- strain
- strings
- string
- inclinometer
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- Expired - Fee Related
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- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
The utility model relates to a differential vibratory string type inclinometer with long-time and accurate monitoring for the incline change of a building, belonging to a transducer which can monitor the incline change of the horizontal and vertical surface for the building, and the differential vibratory string type inclinometer also can measure the variation of the angular displacement which can use the instrument scale distance as the reference scale. The inclinometer is arranged in a sealed casing, and comprises a strain beam, an elastic pendulum, two vibratory strings, two groups of signal excitation and pickup devices and a signal output lead wire. The strain beam and a heavy bob comprise the elastic pendulum, both sides of the elastic pendulum are fixed respectively with the vibratory strings, and both sides of the strain beam are fixed respectively with the signal excitation and pickup devices; the strain beam can generate the bending deformation when the strain beam of the inclinometer can be faced with a plumb line and can incline certain angle, one vibratory string A can generate the tensile strain, and one vibratory string B can generate the compressive strain which is of the equal strain quantity with the vibratory string A. The natural frequency of the vibratory strings A and B of thetwo coil sense can be measured respectively by adopting a vibratory-string-type frequency number-reading device, and the corresponding inclination angle of the inclinometer and the primary point can be worked out. The relationship of the natural frequency value of the vibratory strings and the inner strain of the vibratory strings can be that the square of the natural frequency of the vibratory strings can be the direct proportion with the inner strain of the vibratory strings, and the transducing principle from the inclined change to the frequency output of the vibratory strings can be accomplished.
Description
Affiliated technical field:
The utility model relates to the sensor of the tilt variation of a kind of level of monitoring buildings and vertical surface, the Differential vibratory string type inclinometer of the tilt variation in hydraulic structure, rock mass, industry, civil building, road, bridge and tunnel etc. such as precise monitoring concrete dam especially for a long time.Also can measure with the instrument gauge length is the long variation in angular displacement amount of fiducial mark.
Background technology:
At present, known building inclination monitoring is the inclinator that adopts resistance-type.It is to utilize the instrument of the elastic wire of instrument internal as sensing element, steel wire is subjected to the pulling force effect and produces elastic deformation, so the relation of its distortion and the linear distortion of resistance variations is as long as the variation at the angle of inclination of level that the steel wire resistance variations of determining instrument inside can draw tested buildings by converting or vertical surface.This instrument in extraneous temperature variation hour, there are linear relationship in resistance change and temperature variation, ambient temperature then can influence the precision of instrument when changing greatly, just can not monitor out the building inclination variation exactly, and measurement range is generally less.
The purpose of utility model:
For overcome the resistance-type inclinator with ambient temperature change cause measured value error greatly and the little shortcoming of measurement range, the utility model provides a kind of Differential vibratory string type inclinometer, the sensing element of this instrument (string wire also claims vibratory string) its creep after bakingout process is minimum, zero point stability, be subjected to extraneous thermal effect little, therefore extremely engineering circle favor.
Technical scheme and beneficial effect:
The technical scheme that its technical matters that solves the utility model adopts is: in the housing of sealing, strain beam, elasticity pendulum, two vibratory strings, two groups of signal excitings and pick device, it is characterized in that the elasticity pendulum is hinged on the housing by strain beam, each fixes a vibratory string elasticity pendulum both sides, one end of string is fixed on the housing, one end is fixed on elasticity and lays out, and each fixes one group of signal exciting and pick device the strain beam both sides.
Principle of work is: when the Instrument shell run-off the straight that is connected with tested works rigidity, because the effect of gravity, the elasticity pendulum (being made up of strain beam and weight) that is hinged on the housing still has the trend in sensing the earth's core, and rebulids stable equilibrium position.Make the strain beam elastic body of inclinator produce the micro-displacement variation, the sensitive element (vibratory string) that is fixed on inclinator inside also produces the micro-displacement variation of equivalent, when inclinator strain beam plane during to the pedal line angle of inclination, strain beam produces flexural deformation, wherein 1 vibratory string A produces stretching strain, 1 vibratory string B then produces the compressive strain (differential principle) that equates with vibratory string A dependent variable in addition, thereby changed the internal stress of vibratory string, be installed on the exciting under the magnetic field force effect with pick device of vibratory string one side center, vibratory string produces proper vibration, vibratory string in the magnetic field is done the vibration of cutting magnetic line, in signal pickup device, produce induction electromotive force, this induction electromotive force is an alternating electromotive force, its alternative frequency is the vibration frequency of vibratory string, adopt type vibration wire frequency readings instrument to measure two respectively and excite the vibratory string A that responds to pick device, the natural frequency of vibration of B then can be measured the relative inclination of this inclinator and initial point.And the natural frequency value of vibratory string and the pass of the internal stress of vibratory string are square being directly proportional with its internal stress of natural frequency of vibratory string, have realized the sensing principle of tilt variation to the output of vibratory string frequency thus.
This inclinator utilization differential principle doubles the sensitivity of sensor, and temperature effect reduces greatly, can be fixed on that tested buildings carries out continuously, the variation at automatic, pitch angle, remote metering position.Can be installed on the high slope that following dam, upstream section of reservoir level or observation personnel are difficult to arrive.Both can be used for measuring the variation of tested building inclination angle, also can measure with the instrument gauge length is the long variation in angular displacement amount of fiducial mark.It is current ideal fixed inclinator.
Description of drawings:
The utility model is described in further detail below in conjunction with accompanying drawing.
Figure one is the utility model fundamental diagram
1 is signal excitation and pick device among the figure one, the 2nd, and vibratory string, the 3rd, weight, the 4th, housing, the 5th, signal excitation and pick device, the 6th, vibratory string, the 7th, strain beam, the 8th, signal output lead.
Figure two is structural representations of the project security monitoring embodiment of Differential vibratory string type inclinometer, the 9th, and deviational survey pipe, the 10th, guide wheel, the 11st, shielded cable, the 12nd, Differential vibratory string type inclinometer, the 13rd, back shaft.
Embodiment:
Shown in the figure one, strain beam (7) is hinged with housing (4), and weight (3) connects firmly with strain beam (7), and vibratory string (2, a 6) end and housing connect firmly, and the other end and weight (3) connect firmly, and signal excitation and pick device (1,5) are fixed on housing.Shown in the figure two, Differential vibratory string type inclinometer (12) connects firmly with back shaft (13), and back shaft (13) is provided with guide wheel (10), and Differential vibratory string type inclinometer (12) slides in deviational survey pipe (9) by guide wheel (10).When the Differential vibratory string type inclinometer housing run-off the straight that is connected with tested works rigidity, because the effect of gravity, the elasticity pendulum that is hinged on the housing (4) still has the trend of pointing to the earth's core, and rebulids stable (balance) position.Differential change promptly takes place in the internal stress of pre-tensioned vibratory string A and vibratory string B.Through electric conversion, output is read with the linear frequency signal of angular displacement and by the frequency readings instrument.Sensor is installed and is buried (being as the criterion with the measured value original stable) underground, measures the frequency modulus FA of two groups of vibratory strings respectively
0And FB
0(F=Hz
2* 10
-3), enter the observation phase to measure the real-time reading FA of two groups of vibratory strings more respectively
i, FB
iAccording to computing formula with calculate K, the B value provide and can obtain fundamental diagram and inclination angle variation delta θ occurs; And differentiate the change direction at inclination angle by the sign of difference.X to Y to.
Computing formula
Δθ＝K[(FA
i-FB
i)-(FA
0-FB
0)]+B
In the formula: the inclination angle variable quantity of Δ θ-tested works (°);
The resolution of K-inclinator (°/F);
FA
iThe frequency modulus real-time measurement values (F) of-inclinator vibratory string A;
FB
iThe frequency modulus real-time measurement values (F) of-inclinator vibratory string B;
FA
0Frequency modulus " 0 " point measurement (benchmark) value (F) of-inclinator vibratory string A;
FB
0Frequency modulus " 0 " point measurement (benchmark) value (F) of-inclinator vibratory string B;
B-The Fitting Calculation modified value (°).
The angle change direction is calculated gained result's sign decision by formula.
Annotate: F=Hz
2* 10
-3
Claims (2)
1, a kind of Differential vibratory string type inclinometer, in the housing of sealing, strain beam, elasticity pendulum, two vibratory strings, two groups of signal excitings and pick device, it is characterized in that the elasticity pendulum is hinged on the housing by strain beam, each fixes a string wire elasticity pendulum both sides, one end of string is fixed on the housing, and an end is fixed on elasticity and lays out, and each fixes one group of signal exciting and pick device the strain beam both sides.
2, inclinator according to claim 1 is characterized in that the utilization of differential principle on the type vibration wire inclinator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03259906 CN2684149Y (en) | 2003-07-25 | 2003-07-25 | Differential vibratory string type inclinometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03259906 CN2684149Y (en) | 2003-07-25 | 2003-07-25 | Differential vibratory string type inclinometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2684149Y true CN2684149Y (en) | 2005-03-09 |
Family
ID=34598865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03259906 Expired - Fee Related CN2684149Y (en) | 2003-07-25 | 2003-07-25 | Differential vibratory string type inclinometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2684149Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103322902A (en) * | 2013-04-03 | 2013-09-25 | 合肥工业大学 | Monitor for side slope two-dimensional angular displacement and pulsation and installation method thereof |
| CN106323159A (en) * | 2016-08-31 | 2017-01-11 | 爱德森（厦门）电子有限公司 | Strain gauge of double vibratory string type |
| CN108267118A (en) * | 2018-04-16 | 2018-07-10 | 华东交通大学 | A kind of strain-type intelligent inclinometer |
-
2003
- 2003-07-25 CN CN 03259906 patent/CN2684149Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103322902A (en) * | 2013-04-03 | 2013-09-25 | 合肥工业大学 | Monitor for side slope two-dimensional angular displacement and pulsation and installation method thereof |
| CN103322902B (en) * | 2013-04-03 | 2016-01-20 | 合肥工业大学 | Side slope two-dimensional angular displacement and pulsation monitor and installation method thereof |
| CN106323159A (en) * | 2016-08-31 | 2017-01-11 | 爱德森（厦门）电子有限公司 | Strain gauge of double vibratory string type |
| CN106323159B (en) * | 2016-08-31 | 2018-08-03 | 爱德森（厦门）电子有限公司 | A kind of dual-vibrating-spring type strain gauge |
| CN108267118A (en) * | 2018-04-16 | 2018-07-10 | 华东交通大学 | A kind of strain-type intelligent inclinometer |
| CN108267118B (en) * | 2018-04-16 | 2024-02-06 | 华东交通大学 | Strain type intelligent inclinometer |
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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 |