CN112683236A - Laser static level settlement measurement method with temperature compensation function - Google Patents
Laser static level settlement measurement method with temperature compensation function Download PDFInfo
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- CN112683236A CN112683236A CN202110232759.2A CN202110232759A CN112683236A CN 112683236 A CN112683236 A CN 112683236A CN 202110232759 A CN202110232759 A CN 202110232759A CN 112683236 A CN112683236 A CN 112683236A
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Abstract
The invention relates to a laser static level settlement measuring method with a temperature compensation function, which is characterized in that a base point base (13) is used as a fixed point, measuring point bases (14) are respectively arranged at a plurality of measuring points, measuring cylinders (4) are respectively arranged on the bases of the base point base (13) and the measuring point bases (14), and a laser displacement sensor (5) is arranged at the top in each measuring cylinder (4); be equipped with float (8) on surveying the liquid in a section of thick bamboo (4), float (8) can be along with a section of thick bamboo interior liquid level (9) up-and-down motion, its characterized in that: an inserted temperature sensor (10) is arranged on the side wall of the bottom of each measuring cylinder (4) and is used for measuring the temperature of liquid; all the laser displacement sensors (5) and the temperature sensors (10) are connected through signal cables (11) and connected to the controller (1), and the signal cables (11) are used for transmitting data and providing power. The invention has the function of temperature compensation and correction, and solves the measurement error caused by non-uniform temperature field.
Description
Technical Field
The invention belongs to the technical field of measurement, and can be applied to measurement of vertical displacement variation, in particular to accurate measurement of vertical displacement of buildings which are in uneven temperature fields and have larger dimension in one direction, such as dam bodies, bridges, strip foundation pits, large-scale precision equipment foundations and the like.
Background
The static leveling method is commonly used for measuring vertical displacement, and has the advantages of clear principle, simple and reliable equipment and low manufacturing cost, thereby being widely popularized and applied. The basic principle is as follows: the unit potential energy of each point of the communicated liquid in a static state is conserved, the potential energy of all liquid level positions is equal, and the liquid level is horizontal under the condition that the pressure on the free liquid level is equal. Namely, the liquid level is communicated and has free liquid level and liquid at the same temperature, and the liquid level elevations are equal. At present, although various structural forms exist, the basic structure is the same.
With the progress of the measurement technology, the hydrostatic leveling method is gradually developed from manual measurement to automatic measurement, so that the measurement frequency is greatly improved, the possibility is provided for further data analysis, and the change trend of data can be found, namely the change rate of the settlement of the measured point can be found by observing the accumulation and comparison of data measurement. The variations of these variations over a short time are relatively small and therefore the required error of the measurement cannot be excessive. As the measurement object has different requirements for accuracy, the measuring device should also be changed in structure accordingly. To meet the accuracy requirements.
Currently, all hydrostatic levels use liquid as a measurement indicator. Vertical displacement measuring devices manufactured using the basic principle of hydrostatic leveling are in use, where one requirement is that the liquid be subjected to a uniform temperature field. This is because the density of the liquid varies with temperature, and generally the higher the temperature, the lower the volume expansion, the lower the density, and the lower the pressure generated by the liquid column of the same height. In the uneven temperature field, the density of the liquid at the position with high temperature of the temperature field is small, the density of the liquid at the position with low temperature of the temperature field is large, in order to generate the same pressure, the heights of the liquid columns are different, the height of the liquid column at the position with high temperature is high, the height of the liquid column at the position with low temperature is low, namely the liquid level is different, and the measurement takes the liquid level height as the basic condition, which can cause the measurement error. The method can meet the requirements for occasions with low requirements, but can cause measurement errors and distortion under the condition of high required accuracy, and needs to perform accurate measurement to ensure the correctness of data analysis for the occasions requiring measurement of the sedimentation change rate and analysis of the change trend.
Patent No. 2019207145404 provides an "automatic hydrostatic level vertical displacement measuring device based on laser measurement", which was designed by the inventor of the present application, and the hydrostatic level used did not account for measurement data errors due to temperature field non-uniformity.
Disclosure of Invention
In order to solve the problems, a laser static leveling device with a temperature compensation correction function is invented through calculation and experiments. The device solves the measurement error caused by non-uniform temperature field. The invention aims to measure the temperature of liquid at different measuring points used by a static leveling system by using a temperature sensor and calculate the height difference of a liquid column caused by the temperature difference so as to compensate errors caused by uneven temperature. The laser displacement sensor is used in a combined mode, so that the vertical displacement of the measuring point can be measured accurately, in real time and automatically, and meanwhile the laser displacement sensor can be applied to other occasions with similar vertical displacement requirements. The technical scheme adopted for achieving the purpose of the invention is as follows: a laser static level settlement measuring method with temperature compensation function is characterized in that a base point base is arranged near a building to serve as a base point, the base point is selected on bedrock or an old stratum after settlement is finished, measuring point bases are respectively arranged at a plurality of measuring points, the plurality of measuring points are respectively sequentially arranged to be a first measuring point and a second measuring point, and so on, measuring cylinders are respectively installed on the base point base and the bases of the measuring point bases, measuring cylinder base plates of the measuring cylinders are respectively fixed on the base point base and the measuring point bases through fixing bolts and leveled, liquid is filled in the measuring cylinders, the bottoms of all measuring cylinders are connected through communicating pipes, so that the liquid of all measuring cylinders is communicated, and all bubbles in the communicating pipes are discharged; the top in the measuring cylinder is provided with a bracket, and the laser displacement sensor is fixed on the bracket; a floater is arranged on the liquid in the measuring cylinder, and the floater can move up and down along with the liquid level in the cylinder and is used as a laser reflector to indicate the liquid level; there is gaseous communicating pipe at survey section of thick bamboo top to connect all survey sections of thick bamboo to guarantee that the atmospheric pressure on survey section of thick bamboo upper portion equals its characterized in that: an inserted temperature sensor is arranged on the side wall of the bottom of each measuring cylinder and used for measuring the temperature of liquid; all laser displacement sensors and temperature sensors are connected with a controller through signal cables, and the signal cables are used for transmitting data and providing power.
The laser displacement sensors are fixedly arranged at the base point and the top of the measuring cylinder of each measuring point, and the distance from the measuring point of the laser displacement sensor to the liquid level can be measured; the bottom of the measuring cylinder is provided with a temperature sensor for measuring the temperature of the liquid in each measuring cylinder and transmitting the measured temperature value to the controller through a signal cable, a calculation program arranged in the controller processes the measured temperature, water level and other information, and the density change of the liquid at all measured points caused by the temperature is compared with the density of the base point liquid, namely the measured liquid is measured
The liquid column height of the dots is converted into the liquid column height of the base dots.
The calculation process is as follows:
taking the base point and the first measuring point as an example: let the temperature of the liquid at the base point be t0The density of the liquid at a temperature t0Is gammat0(ii) a The temperature of the liquid at the position of the first measuring point is t1The density of the liquid at a temperature t1Is gammat1The density variation with temperature is determined by the physical properties of the liquid used, known from the liquid properties;
the temperature value is measured by a temperature sensor arranged at the bottom in the measuring cylinder. The distance from the start measuring point to the liquid level is measured by a laser displacement sensor arranged at the top of the measuring cylinder
(ii) a The vertical height from the starting point of the laser displacement sensor to the central line of the liquid communicating pipe is L1Can be detected during installation; the vertical liquid depth from the liquid level in the measuring cylinder to the central line of the communicating pipe is H1=L1-
The height of the liquid columnDegree is at a temperature t1The pressures generated were measured as:
P1=H1×γt1=(L1-
)×γt1
at a liquid temperature t0When the pressure is equal, the required height of the liquid column is
，
Then there are: (L)1-
)×γt1=
×γt0
Thus, the corrected liquid column height is:
wherein:
γt0at a liquid temperature tt0The density of the liquid at time;
γt1at a liquid temperature t1The density of the liquid at time;
H1-the vertical liquid column height (L) from the liquid level in the measuring cylinder of the measuring point to the central line of the communicating pipe1-
）；
L1The vertical distance between the starting point of the laser displacement sensor and the central line of the liquid communicating pipe is measured when the laser displacement sensor is installed;
Correcting the height of liquid column when measuring point is adjusted to the liquid temperature of base point
Then, the vertical displacement variation of the measuring point can be calculated according to the standard calculation method of the static level, and the liquid column height when other measuring points are corrected to the liquid temperature of the base point in a unified way
The calculation method is the same.
The invention relates to a laser static leveling device with a temperature compensation and correction function, which solves the measurement error caused by non-uniform temperature field.
Description of the drawings:
FIG. 1 is a schematic diagram of the present invention.
In the figure, 1, a controller; 2. fixing the bolt; 3. a bobbin chassis; 4. measuring a cylinder; 5. a laser displacement sensor; 6. a gas communicating pipe; 7. a laser holder; 8. a float; 9. a liquid level; 10. a temperature sensor; 11. a signal cable; 12. a liquid communicating pipe; 13. a base point base; 14. a base of the measuring point is provided,
15. base point, 16, first measuring point, 17, second measuring point.
The specific implementation mode is as follows:
referring to the attached drawings, a laser static leveling and sinking measurement method with a temperature compensation function is characterized in that a base point base 13 is arranged near a building to serve as a base point 15, the base point 15 is selected to be on a bed rock or an old stratum after sinking is finished, measuring point bases 14 are respectively arranged at a plurality of measuring points, the plurality of measuring points are respectively arranged as a first measuring point 16 and a second measuring point 17 in sequence, and so on, measuring cylinders 4 are respectively arranged on the base point base 13 and the bases of the measuring point bases 14, measuring cylinder base plates 3 of the measuring cylinders 4 are respectively fixed on the base point base 13 and the measuring point bases 14 through fixing bolts 2 and are leveled, liquid is filled in the measuring cylinders 4, the bottoms of all the measuring cylinders 4 are connected through communicating pipes 12, the liquid of all the measuring cylinders is communicated, and all bubbles in the communicating pipes 12 are discharged; a bracket 7 is arranged at the top in the measuring cylinder 4, and the laser displacement sensor 5 is fixed on the bracket 7; a floater 8 is arranged on the liquid in the measuring cylinder 4, and the floater 8 can move up and down along with the liquid level 9 in the cylinder and is used as a laser reflector to indicate the liquid level; there is gaseous communicating pipe 6 to connect all the survey section of thick bamboo at survey section of thick bamboo top to guarantee that the atmospheric pressure on survey section of thick bamboo upper portion equals its characterized in that: an inserted temperature sensor 10 is arranged on the side wall of the bottom of each measuring cylinder 4 and used for measuring the temperature of liquid; all the laser displacement sensors 5 and the temperature sensors 10 are connected with a signal cable 11 and connected to the controller 1, and the signal cable 11 is used for transmitting data and providing power.
The laser displacement sensors are fixedly arranged at the base point and the top of the measuring cylinder of each measuring point, and the distance from the measuring point of the laser displacement sensor to the liquid level can be measured; the bottom of the measuring cylinder is provided with a temperature sensor for measuring the temperature of the liquid in each measuring cylinder and transmitting the measured temperature value to the controller through a signal cable, a calculation program arranged in the controller processes the measured temperature, water level and other information, and the density change of the liquid at all measured points caused by the temperature is compared with the density of the base point liquid, namely the measured liquid is measured
The liquid column height of the dots is converted into the liquid column height of the base dots.
The calculation process of the invention is as follows:
taking the base point 15 and the first measuring point 16 as examples: let the temperature of the liquid at the location of the base point 15 be t0The density of the liquid at a temperature t0Is gammat0(ii) a The temperature of the liquid at the position of the first measuring point 16 is t1The density of the liquid at a temperature t1Is gammat1The density variation with temperature is determined by the physical properties of the liquid used, by the liquidThe body characteristics are known;
the temperature value is measured by a temperature sensor arranged at the bottom in the measuring cylinder. The distance from the start measuring point to the liquid level is measured by a laser displacement sensor arranged at the top of the measuring cylinder
(ii) a The vertical height from the starting point of the laser displacement sensor to the central line of the liquid communicating pipe is L1Can be detected during installation; the vertical liquid depth from the liquid level in the measuring cylinder to the central line of the communicating pipe is H1=L1-
The height of the liquid column is at a temperature t1The pressures generated were measured as:
P1=H1×γt1=(L1-
)×γt1
at a liquid temperature t0When the pressure is equal, the required height of the liquid column is
，
Then there are: (L)1-
)×γt1=
×γt0
Thus, the corrected liquid column height is:
wherein:
γt0at a liquid temperature tt0The density of the liquid at time;
γt1at a liquid temperature t1The density of the liquid at time;
H1-the vertical liquid column height (L) from the liquid level in the measuring cylinder of the measuring point to the central line of the communicating pipe1-
）；
L1The vertical distance between the starting point of the laser displacement sensor and the central line of the liquid communicating pipe is measured when the laser displacement sensor is installed;
correcting the height of liquid column when measuring point is adjusted to the liquid temperature of base point
Then, the vertical displacement variation of the measuring point can be calculated according to the standard calculation method of the static level, and the liquid column height when other measuring points are corrected to the liquid temperature of the base point in a unified way
The calculation method is the same.
When the device works, the controller 1 controls the laser displacement sensor 5 to measure the vertical distance from the starting point of each measuring point to the central line of the liquid communicating pipe through a built-in calculation program, measures the liquid temperature of the base point and each measuring point simultaneously, and calculates the corrected liquid column height through the formula (1); then comparing with the liquid level change of the base point, and calculating the vertical displacement variable quantity of each measuring point. The controller 1 may transmit the measurement results to a central control room for use by a manager, either by wire or wirelessly.
Claims (1)
1. A laser static leveling settlement measuring method with temperature compensation function is provided, a base point base (13) is arranged near a building to be used as a base point (15), the base point (15) is selected on a bedrock or an old stratum after settlement, measuring point bases (14) are respectively arranged on a plurality of measuring points, the plurality of measuring points are respectively arranged as a first measuring point (16) and a second measuring point (17) in sequence, and so on, the measuring cylinder chassis (3) of the measuring cylinder (4) is respectively fixed on the base point base (13) and the measuring point base (14) through fixing bolts (2) and leveled, liquid is filled in the measuring cylinder (4), the bottoms of all the measuring cylinders (4) are connected through communicating pipes (12) to communicate the liquid of all the measuring cylinders, and all bubbles in the communicating pipes (12) are discharged; a bracket (7) is installed at the top in the measuring cylinder (4), and the laser displacement sensor (5) is fixed on the bracket (7); a floater (8) is arranged on the liquid in the measuring cylinder (4), and the floater (8) can move up and down along with the liquid level (9) in the cylinder and is used as a laser reflector to indicate the liquid level; there is gaseous communicating pipe (6) at survey section of thick bamboo top to connect all survey sections of thick bamboo to guarantee that the atmospheric pressure on survey section of thick bamboo upper portion equals its characterized in that: an inserted temperature sensor () 10 is installed on the side wall of the bottom of each measuring cylinder 4 and is used for measuring the temperature of liquid; all the laser displacement sensors (5) and the temperature sensors (10) are connected with the controller (1) through signal cables (11), the signal cables (11) are used for transmitting data and providing power, the laser displacement sensors are fixedly installed at the base point and the tops of the measuring cylinders of the measuring points, and the distance from the starting point of the laser displacement sensor to the liquid level can be measured; the bottom of the measuring cylinder is provided with a temperature sensor for measuring the temperature of the liquid in each measuring cylinder and transmitting the measured temperature value to the controller through a signal cable, a calculation program arranged in the controller processes the measured temperature, water level and other information, and compares the density change of the liquid at all measured points caused by the temperature with the density of the liquid at the base point, namely, the height of the liquid column at the measured points is converted into the height of the liquid column at the base point;
the calculation process of the invention is as follows:
let the temperature of the liquid at the position of the base point (15) be t0The density of the liquid at a temperature t0Is gammat0(ii) a The temperature of the liquid at the position of the first measuring point (16) is t1The density of the liquid at a temperature t1Is gammat1The density variation with temperature is determined by the physical properties of the liquid used, known from the liquid properties;
the temperature value is measured by a temperature sensor arranged at the bottom in the measuring cylinder, and the distance from a measuring point to the liquid level is measured by a laser displacement sensor arranged at the top of the measuring cylinder
(ii) a The vertical height from the starting point of the laser displacement sensor to the central line of the liquid communicating pipe is L1Can be detected during installation; the vertical liquid depth from the liquid level in the measuring cylinder to the central line of the communicating pipe is H1=L1-
The height of the liquid column is at a temperature t1The pressures generated were measured as:
P1=H1×γt1=(L1-
)×γt1
at a liquid temperature t0When the pressure is equal, the required height of the liquid column is
，
Then there are: (L)1-
)×γt1=
×γt0
Thus, the corrected liquid column height is:
wherein:
γt0at a liquid temperature tt0The density of the liquid at time;
γt1at a liquid temperature t1The density of the liquid at time;
H1-the vertical liquid column height (L) from the liquid level in the measuring cylinder of the measuring point to the central line of the communicating pipe1-
）；
L1The vertical distance between the starting point of the laser displacement sensor and the central line of the liquid communicating pipe is measured when the laser displacement sensor is installed;
correcting the height of liquid column when measuring point is adjusted to the liquid temperature of base point
Then, the vertical displacement variation of the measuring point can be calculated according to the standard calculation method of the static level, and the liquid column height when other measuring points are corrected to the liquid temperature of the base point in a unified way
The calculation method is the same.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110232759.2A CN112683236A (en) | 2021-03-03 | 2021-03-03 | Laser static level settlement measurement method with temperature compensation function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113959403A (en) * | 2021-10-21 | 2022-01-21 | 上海朝辉压力仪器有限公司 | Temperature compensation method of level gauge |
| CN115790521A (en) * | 2022-11-09 | 2023-03-14 | 广西壮族自治区水利电力勘测设计研究院有限责任公司 | Method for correcting unparallel of normal level surface |
-
2021
- 2021-03-03 CN CN202110232759.2A patent/CN112683236A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113959403A (en) * | 2021-10-21 | 2022-01-21 | 上海朝辉压力仪器有限公司 | Temperature compensation method of level gauge |
| CN115790521A (en) * | 2022-11-09 | 2023-03-14 | 广西壮族自治区水利电力勘测设计研究院有限责任公司 | Method for correcting unparallel of normal level surface |
| CN115790521B (en) * | 2022-11-09 | 2023-09-29 | 广西壮族自治区水利电力勘测设计研究院有限责任公司 | Method for correcting non-parallel normal level |
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