CN102506902A - Device and method for evaluating accuracy of prism-free distance measurement of total station - Google Patents

Abstract

The invention relates to a measurement accuracy evaluation device and method for a total station without prism distance measurement mode. The evaluation device includes two rotatable fixed platforms with scales; a positioning component located on the fixed platforms; A length measuring tool for measuring the distance between the positioning points of the positioning parts on the fixed platform. The evaluation device is combined with a total station for analysis, wherein the total station and the two positioning components are distributed in a triangle, the coordinates of the positioning points of the two positioning components are measured by the total station, and the two positioning components are calculated. The distance between the points is compared with the distance obtained by the length measuring tool to analyze the ranging accuracy of the total station. Through the evaluation device and method of the present invention, the measurement accuracy of the total station in the prism-free mode can be analyzed, corresponding analysis data can be obtained, and then the measurement capabilities of the total station under different conditions can be determined to ensure that the total station has no Fair use of Prism mode.

Description

Accuracy evaluation device and method for total station mirrorless distance measurement

technical field

The present invention relates to an evaluation device and method, in particular to an evaluation device and method for accuracy evaluation of total station without prism distance measurement.

Background technique

The total station is a high-tech measuring instrument integrating light, mechanics and electricity. It is a surveying and mapping instrument system integrating angle measurement and distance measurement functions. It is widely used. The distance measurement of the total station includes prism mode and non-prism mode. Among them, the non-prism measurement mode does not need to use a reflective prism, and does not require the cooperation of auxiliary surveyors. It is especially suitable for applications where it is not suitable to place reflective prisms or reflective sheets, such as super large apertures. Ultrasonic flowmeter installation and positioning, tunnel excavation construction, civil construction stakeout and other occasions. However, the total station generally only focuses on its prism ranging mode during verification, and the verification results obtained in this way cannot guarantee the accuracy of the non-prism ranging mode.

The accuracy of distance measurement in the prism-free mode of the total station is related to the target material, incident angle, and incident distance. In the case of a target material with strong reflection and a small incident angle, the ranging accuracy is reduced or even no valid data can be obtained. Therefore, mastering the ranging accuracy level of the total station under different measurement conditions, avoiding unfavorable conditions of use as much as possible, and giving reasonable uncertainty to the measurement results when it cannot be avoided, is of great significance to the rational use of the total station.

Contents of the invention

The purpose of the present invention is to provide a device and method for evaluating the measurement accuracy of the total station's non-prism ranging mode.

The invention provides an accuracy evaluation device for the non-prism distance measuring mode of the total station, which comprises a first fixed platform and a second fixed platform which are rotatable and have scales; parts and a second positioning component positioned on the second fixed platform; and a length measuring tool for measuring the distance between the positioning point of the first positioning component and the positioning point of the second positioning component; the total station and the The first positioning part and the second positioning part are distributed in a triangle, and the coordinates of the positioning point of the first positioning part and the coordinates of the positioning point of the second positioning part are measured by the total station.

Wherein, the material to be measured is pasted on the end faces of the first positioning component and the second positioning component, or the first positioning component and the second positioning component are processed from the material to be measured.

Wherein, the total station is at the same level as the first positioning component and the second positioning component.

Wherein, the first fixed platform and the second fixed platform are arranged on the same graduated slide rail.

Wherein, the first positioning component and the second positioning component are cylinders, and there is a positioning point marked with a cross at the center of the circle on one side of the cylinder.

The present invention provides a measurement accuracy evaluation method for the non-prism distance measurement mode of the total station, which adopts the above-mentioned evaluation device, and first uses a length measurement tool to measure the distance between the positioning points of the first positioning part and the second positioning part secondly, measure the coordinates of the first positioning component positioning point and the second positioning component positioning point by the total station, and calculate the second distance between the first positioning component positioning point and the second positioning component positioning point ; Finally, the ranging accuracy of the total station is obtained by comparing the first distance with the second distance.

Wherein, the first distance is an average value of multiple measurements.

Wherein, by replacing the material to be measured on the first positioning part and the second positioning part or replacing the first positioning part and the second positioning part, the measurement accuracy of the total station under different material conditions is analyzed.

Wherein, by rotating the first positioning part and the second positioning part, the measurement accuracy data of the total station under different incident angle conditions are obtained.

Among them, by changing the distance between the total station and the center point of the line connecting the two positioning components, the measurement accuracy data of the total station under different incident distance conditions are obtained.

The distance between the two positioning parts is reasonably selected according to the available standard length. Since the distance measurement accuracy of the total station without prism is generally about 2mm, the accuracy of the standard length is generally better than 0.4mm. Tools such as inner diameter micrometer or portable measuring arm can be used to provide an adjustable standard length on site, or make Several standard lengths of stable length are provided to provide this standard length.

Through the evaluation device of the present invention, the measurement accuracy of the total station in the non-prism mode can be analyzed, corresponding analysis data can be obtained, and then the measurement capabilities of the total station under different conditions can be determined to ensure the accuracy of the total station in the non-prism mode. fair use. Since length measurement has many direct applications in the industrial field, the evaluation results can be directly applied to the analysis of actual measurement results.

Description of drawings

Fig. 1 Schematic diagram of the evaluation device of the total station in the prismless ranging mode.

Detailed ways

For ease of understanding, the present invention will be further explained below in conjunction with the accompanying drawings.

Example 1

As shown in FIG. 1 , the total station 1 is in the non-prism mode, and the ranging accuracy of the total station 1 is evaluated using an evaluation device including two fixed platforms and a standard length measuring tool (not shown). The two fixed platforms are rotatable fixed platforms with scales, which are respectively the first fixed platform 2 and the second fixed platform 3. Specifically, there are circumferential scales on the two fixed platforms, and the fixed platforms can be By manually adjusting the rotary scale dial, or a motor-driven scale disc. The first positioning part 4 is fixed on the first fixed platform 2 by a clamp, and likewise, there is a second positioning part 5 on the second fixed platform 3, and the second positioning part 5 can be fixed to the second fixed platform. On platform 3, the positioning parts on the two fixed platforms can manually adjust the angle or automatically select the appropriate rotation position and rotation angle by program control. And the structure of the second positioning part on it is the same.

In addition to the first positioning part 4 and the second positioning part 5 being processed from the material to be tested, the end faces of the first positioning part 4 and the second positioning part 5 can also be pasted with the material to be tested. For the first positioning part 4 and the second positioning part 5, the shape is preferably a cylinder, but not limited to a cylinder. As shown in Figure 1, it is a top view of the cylinder, the cylinder is fixed horizontally on the fixed platform, and the circular end surface of the cylinder is used to place the target to be measured or the sample to be tested. Further, in order to ensure that the sample to be tested Or the accurate evaluation of the material, it is preferable to use the material to be tested to be integrally processed into the first positioning part and the second positioning part. Preferably, the central point of the positioning component is used as the positioning point for measurement or observation, and more preferably, the intersection point of the cross mark is used as the positioning point for measurement or observation. For the first positioning part and the second positioning part processed by the material to be tested, the positioning point can be determined during processing, and the cross mark can be accurately depicted; and for the situation of pasting the material to be tested on the positioning part, it is necessary to paste After completion, determine the positioning point of the sample to be tested, and accurately describe the cross mark. It is preferable to use coordinate measuring equipment to determine the center of the end face of the positioning part as the positioning point, first collect the coordinate points on the cylindrical surface, then collect the coordinate points on the cylindrical end face, project the coordinate points on the cylindrical surface to the cylindrical end face, and fit the coordinate points The obtained plane is a standard circle, and the center of the circle is the precise position of the positioning point.

The circular end surface of the first positioning part 4 and the circular end surface of the second positioning part 5 face the total station 1 respectively. Set the first fixed platform 2 and the second fixed platform 3 at a certain distance, and keep the two fixed platforms horizontal and equal in height. The distance between the two positioning parts is reasonably selected according to the available standard length, and the standard length is preferably 1m Above, the possible maximum value of the length is determined by the measuring range of the standard ruler or the three-coordinate machine. After the first fixed platform 2 and the second fixed platform 3 are installed, the distance between the centers of the cross marks of the first positioning part 4 and the second part 5 is measured using a length measuring tool, which can be a standard Due to the measurement accuracy of the standard ruler, it is preferable to use an inner micrometer for occasions with high precision requirements. In order to further improve the accuracy of length measurement, it is more preferable to use a portable coordinate measuring arm to measure the distance between two positioning points. . When measuring, first measure the cylindrical surface and select a number of measurement points, and then project them onto the end surface. The center of the projection circle is the center point. Measure the projection center points of the first positioning part 4 and the second positioning part 5 by a ruler or a three-coordinate machine The distance L1 between them is defined as the first distance. Accurate values of L1 are obtained through multiple measurements.

Install and level the total station 1, arrange the total station 1 and the first fixed platform 2 and the second fixed platform 3 attached to the sample to be measured into an isosceles triangle shape, preferably an equilateral triangle, and use a tripod to place the three adjusted to the same level. Measure the coordinates of the positioning point on the first positioning part 4 by the total station 1, and measure the coordinates of the positioning point on the second positioning part 5, calculate the first positioning part 4 and the second according to the two coordinates measured by the total station The distance L2 between the center points of the positioning components 5 is defined as the second distance, and the measurement error value of the total station can be obtained by comparing L1 with L2. In the actual measurement process, it is necessary to use the total station for multiple measurements, and to count the mean value and standard deviation of the measurement distance. The evaluation data of the measurement accuracy of the total station can be obtained through the measurement error value, the mean value and the standard deviation of the measurement distance.

In order to verify the measurement accuracy of the total station for the same measurement target, on the premise that the distance from the total station to the positioning component remains unchanged, the rotation angles of the first positioning component 4 and the second control component 5 can be controlled to achieve different Incident angle α, according to the statistical analysis of the distance data obtained by the total station measurement under different incident angles, the measurement accuracy evaluation data of the total station under the sample material to be tested can be obtained. In addition, the measurement accuracy data of the total station under different incident distance conditions can also be obtained by changing the distance between the total station and the center point of the line connecting the two positioning components. Furthermore, by replacing the first positioning part 4 and the second positioning part 5 or changing the sample to be measured on the positioning part, the measurement accuracy of the total station under different sample conditions is analyzed, so that the measurement accuracy of the total station can be mastered. ability.

Example 2

As a modification of Embodiment 1 of the present invention, the same content of Embodiment 2 and Embodiment 1 will not be repeated, and the first fixed platform and the second fixed platform can be arranged on a horizontal sliding rail with scales, thereby facilitating the second Accurate adjustment of the distance between the first fixed platform and the second fixed platform, the positioning components on the fixed platform are not limited to cylinders, as long as the incidence surfaces of the first positioning component and the second positioning component are regular and easy to determine their center points The shape of the total station can be replaced by the first positioning part and the second positioning part and the different sample substances to be tested on the total station, and the length is measured at different incident angles and incident distances, and the total station can be obtained. The measurement accuracy evaluation data of the instrument.

The evaluation device of the present invention can analyze the measurement accuracy of the total station in the non-prism mode, obtain corresponding analysis data, and then determine the measurement capabilities of the total station under different conditions, and ensure the use of the total station without any problems. Accuracy of ranging data in Prism mode.

While the present invention has been shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that changes in form and details may be made without departing from the spirit and scope of the invention as defined in the appended claims. of various changes.

Claims (10)

1. A measurement accuracy evaluation device for total station without prism distance-finding mode, it comprises the first fixed platform and the second fixed platform that are rotatable and have scale; Be positioned at the first positioning part on the first fixed platform And the second positioning part on the second fixed platform; and the length measurement tool for measuring the distance between the positioning point of the first positioning part and the positioning point of the second positioning part; it is characterized in that: the total station The first positioning component and the second positioning component are distributed in a triangle, and the coordinates of the positioning points of the first positioning component and the second positioning component are measured by the total station. 2. the measurement accuracy evaluation device for total station without prism distance-finding mode as claimed in claim 1, is characterized in that: the end face of first positioning component and the second positioning component is pasted with material to be measured, or The first positioning component and the second positioning component are processed from the material to be tested. 3. The measurement accuracy evaluation device for the non-prism distance measurement mode of the total station as claimed in claim 1, characterized in that: the total station is at the same level as the first positioning component and the second positioning component. 4. the measurement accuracy assessment device for the total station without prism ranging mode as claimed in claim 1, characterized in that: the first fixed platform and the second fixed platform are arranged on the same graduated platform on the rails. 5. the measurement accuracy assessment device for total station without prism distance-finding mode as claimed in claim 1, is characterized in that: described first positioning component and second positioning component are cylinders, and on one side of cylinders An anchor point marked with a cross in the center of the side face circle. 6. A measurement accuracy evaluation method for a total station without a prism ranging mode, which adopts the evaluation device according to any one of claims 1-5, characterized in that: utilize a length measurement tool to measure the first positioning The first distance between the positioning point of the component and the second positioning component; the coordinates of the first positioning component and the second positioning component are measured by a total station, and the distance between the positioning point of the first positioning component and the second positioning component is calculated. the second distance; the total station measurement accuracy data is obtained by comparing the first distance with the second distance. 7. The measurement accuracy evaluation method for the non-prism distance measurement mode of the total station as claimed in claim 6, characterized in that: the first distance is an average value of multiple measurements. 8. the measurement accuracy evaluation method that is used for total station without prism ranging mode as claimed in claim 6, is characterized in that: by changing the material to be measured on the first positioning part and the second positioning part, or replacing the second positioning part The first positioning component and the second positioning component analyze the measurement accuracy of the total station under different material conditions. 9. the measurement accuracy evaluation method that is used for total station without prism distance-finding mode as claimed in claim 6, is characterized in that: by rotating the first positioning part and the second positioning part, obtain the full range under the condition of different incident angles The measurement accuracy data of the station instrument. 10. the measurement accuracy evaluation method that is used for total station without prism ranging mode as claimed in claim 6, it is characterized in that: by adjusting total station and two positioning parts connection center point distance, obtain different incident distance conditions The measurement accuracy data of the total station below.

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