Device for automatic measuring coordinates of string plummets of hydraulic structures

FIELD: measurement technology.

SUBSTANCE: device for automatic measuring coordinates of string plummets of hydraulic structures has reflecting screen, illumination source, two optical systems each of which is blocked with corresponding electro-optical array, device for measuring coordinate of string's projection, digital serial communication desk. Device also has resolver that has in turn two input serial communication desks, which have their outputs connected with controller, and indicator.

EFFECT: high precision of measurement of coordinates of string plummets.

2 cl, 1 dwg

 

The invention relates to the field of geodetic measurements, in particular for optoelectronic methods and means of control of the geometrical displacement of the object relative to the selected coordinate system.

In practice, hydraulic construction to ensure the safety of structures are widely used device control horizontal displacement of the building structure relative to the direct and inverse string plumb. While the required accuracy of measurement is not less than 100 μm.

For these purposes in the world practice used portable opto-mechanical coordinatograph, for example optical coordinatograph production, "Freiberger precision-mechanic GmbH [1], which allows using the micrometer screws by optical monitoring of the position of the string and measuring tools to ensure the specified accuracy. However, these devices are expensive precision tools and does not allow to automate the measurement process, which is especially important for multi-point control.

In domestic practice devices are used for automated measurement of a coordinate string of the plumb hydraulic structures, consisting of a generator of high-frequency current and two pairs of mutually-orthogonal induction coils located symmetrically considers the flax strings, United by measuring the difference between the EMF for each of the pairs of coils, based on what can make a conclusion about the current coordinate strings [2].

However, as the experience of using these products in real conditions such devices do not provide the necessary accuracy and stability of measurements, require periodic calibration is sensitive to the influence of operational factors.

In the measuring technique known device for automated coordinate measuring string plumb, for example, model RxTxTelependulum, production RocTest (Canada, USA) [3], containing optoelectronic sensors. The disadvantages of these measures is small, the measuring range and the extremely high cost of the meter.

The basis of the invention is highly accurate automated measurement coordinate string of weights used in the construction of hydraulic structures HPP to determine the horizontal deflection of the building from the vertical string of a plumb in two planes.

The problem is solved in that the device for automated measurement of a coordinate string of the plumb hydraulic structures, consisting of a reflecting screen, a light source, two independent mutually-orthogonal optical systems, each of which is interlocked with the corresponding optoel the throne matrix, rigidly fastened with elements of optical systems design lenses, and the light source and the design of the lens is rigidly fixed on the base plate, the first optoelectronic matrix connected to the input of the first device for measuring the coordinates of the projection of the string, the output of the second optoelectronic matrix connected to the input of the second device for measuring the coordinates of the projection of the string, the output of the first device for measuring the coordinates of the projection of the string connected to the first input digital serial communication port, the output of the second device for measuring the coordinates of the projection of the string is connected with the second input digital serial communications port according to the invention additionally introduced the crucial device that contains two input serial communication port, outputs connected to the controller and the indicator, and the entrance of a casting device connected to the output of digital serial communication port, and the output of a casting device connected to the input of the indicator.

Thus the light source, consisting of a matrix-emitting LEDs located at an angle of 45° to the optical axis of each optical system.

The principal difference is the presence and location of elements of the proposed device for automated measurement of a coordinate string of the plumb Hydra the technical installations, as well as the presence of a casting device while taking into account the results of measurements in two orthogonal coordinates eliminates systematic measurement error that is associated with the dependence on the measurement of one coordinate from the position of the string of a plumb according to another coordinate.

The drawing shows a structural diagram of an apparatus for automated measurement of a coordinate string of the plumb hydraulic structures, which contains the string 1, the reflective screen 2, the light source 3, the optical system 4 and 5, optoelectronic matrix 6 and 7 rigidly connected with the elements of optical systems design lenses 8 and 9. The light source 3 and the design of the lenses 8, 9 rigidly mounted on the base plate 10. The output of the first optoelectronic matrix 6 is connected to the input of the first device 11 measuring the coordinates of the projection of the string 1, the output of the second optoelectronic matrix 7 is connected to the input of the second device 12 measuring the coordinates of the projection of the string 1. The output of the first device 11 measuring the coordinates of the projection of the string 1 is connected to the first input digital serial communication port 13, the output of the second device 12 measuring the coordinates of the projection of the string 1 is connected with the second input digital serial communication port 13. Output digital serial communication port 13 is connected to the input R is destructive device 14, and the output of a casting device 14 is connected to the input of the indicator 15. The optical axis of the optical systems 4 and 5 are orthogonal to each other; a light source 3, consisting of a matrix-emitting LEDs located at an angle of 45° to the optical axes of the optical systems 4 and 5.

The measurement process is as follows: formed by the optical systems 4 and 5, the image strings 1 optoelectronic dies 6 and 7 are converted into electrical signals, measured respectively by the devices 11 and 12 measure the coordinates of the projection of the string. With each device for measuring the coordinates of the projection of the string measured value of the corresponding projection of the string is passed through a digital serial communication port 13 on the crucial device 14, which on the basis of the received information and the known parameters of the optical system calculates the desired coordinates of the string displayed on the display 15.

The actual coordinates of strings are calculated by the formulas:

where r=dFe+d3- the distance between the centers of two adjacent photosensitive elements (pixels) of an optoelectronic matrix is the sum of the size of the photosensitive element dFeand the distance between adjacent pixels d3;

nxand ny- number f is locustville element (pixel), which corresponds to the center of the signal with the shaded elements of an optoelectronic matrix (observation dark chords on a light background) for each coordinate;

N is the total number of pixels on the photodetector;

dxand dythe distances from the main planes of the optical systems 4 and 5 to the center coordinates;

and- focal length optical systems 4 and 5 respectively.

Technically device 11, 12 measurements of the coordinates of the projection of the strings and digital serial communication port 13 can be implemented on the basis of one of the specialized multipurpose microcontroller.

Put signs resolve technical contradiction between the requirements of high precision coordinate measuring strings and systematic error introduced when changing coordinates, orthogonal measured.

The tests given device showed high precision measurements with standard error of 25 μm.

Sources

1. Presentation sheet of the company geotraverse". 197227, Russia. St. Petersburg., P.O.Box 314. Tel/Fax: (812)324-65-81, 259-69-36.

2. Kruk CU, Sidorov GY - "modernization of the measurement coordinate string of the plumb hydraulic structures", M. Waterworks, No. 1 - 2003

3. Presentation Lis the company Roctest, www.roctest.com.

1. Device for automated determination of a coordinate string of the plumb hydraulic structures, consisting of a reflecting screen, a light source, two independent mutually orthogonal optical systems, each of which is interlocked with a corresponding optoelectronic matrix stiffening with elements of optical systems design lenses, and the light source and the design of the lens is rigidly fixed on the base plate, the first optoelectronic matrix connected to the input of the first device for measuring the coordinates of the projection of the string, the output of the second optoelectronic matrix connected to the input of the second device for measuring the coordinates of the projection of the string, the output of the first device for measuring the coordinates of the projection of the string connected to the first input digital serial communication port, the output of the second device for measuring the coordinates of the projection of the string is connected with the second input digital serial communication port, characterized in that it additionally contains the crucial device that contains two input serial communication port, outputs connected to the controller and the indicator, and the entrance of a casting device connected to the output of digital serial communication port, and the output of a casting device connected to the input of the indicator is.

2. Device for automated determination of a coordinate string of the plumb hydraulic structures under item 1, characterized in that the light source, consisting of a matrix-emitting LEDs, located at an angle of 45° to the optical axis of each optical system.



 

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