Multi-station three-dimensional laser scanning internal measurement device and method for volume of vertical tank with large length-diameter ratio

Abstract

The invention discloses a multi-station three-dimensional laser scanning internal measurement device and method for the volume of a vertical tank with a large length-diameter ratio, belongs to the technical field of laser scanning, and adopts the technical scheme that the multi-station three-dimensional laser scanning internal measurement device comprises a laser scanner, a guide rail arranged inthe axis direction of a vertical tank, a splicing target and a processor; the guide rail is provided with a transmission assembly for driving the laser scanner to slide along the length direction of the guide rail, the laser scanner is provided with a plurality of measuring stations under the driving of the transmission assembly, the splicing target is arranged between two adjacent measuring stations and is positioned in a common scanning range of the two adjacent measuring stations, and the processor is arranged outside the vertical tank, receives data measured by the laser scanner, splices the data, and calculates a volume value. The laser scanner extends into the tank body along the axial direction of the tank body for measurement, and high-precision and equal-precision measurement datais obtained in a manner of splicing point cloud data measured by multiple stations, so that the problem that the volume of a vertical tank body with a large length-diameter ratio cannot be measured in the prior art is solved.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional laser scanning, and in particular relates to a volumetric multi-station three-dimensional laser scanning internal measurement device and method for a vertical tank with a large length-to-diameter ratio. Background technique [0002] The measurement of the volume of large tanks is of great significance. International bulk liquid trade is often carried out with tank containers. Whether the volume of tanks can be accurately measured is not only directly related to the interests of our country, but also related to our image and reputation; The volume measurement accuracy of rocket and other spacecraft fuel tanks is directly related to the quality of the flight results. Insufficient fuel affects the flight mission, and too much fuel increases the payload of the spacecraft and affects the carrying capacity. At present, traditional geometric measurement methods are mainly used for the measureme...

AI Technical Summary

Problems solved by technology

The characteristics of this technical solution are: (1) The method of completing data splicing through three-station measurement and setting targets at the bottom of the tank can effectively avoid the problem of light blocking by accessories in the tank to a certain extent, but for tanks with relatively large lengths , can not solve the problem of the light blocking structure far away from the scanner and the influence of detailed structures such as ribs and ribs on the inner surface of the tank, and cannot be measured; (2) The measuring station and target are set at the bottom of the tank, which cannot solve the There is an error in the target positioning caused by the tilt of the laser light during measurement; (3) The measurement accuracy of the tank part far away from the scanner is low, and finally the volume is calculated with the same accuracy, which affects the volume measurement accuracy

[0004] In summary, the current 3D laser scanning method used for volume measurement of vertical tanks with large and complex structures cannot effectively solve the problem of light-shielding structures inside vertical tanks with large length-diameter ratios and complex structures. Measurement, for tanks with a relatively large length and diameter, there is a problem that the measurement accuracy of the tank point cloud data is not equal due to the low measurement accuracy farther away from the scanner, and finally participates in the volume calculation with the same weight to affect the measurement accuracy of the tank volume. In addition, For a vertical tank with a complex structure with a large length-to-diameter ratio, it is impossible to measure the characteristics of detailed structures such as ribs and ribs on the inner surface of the tank; the geometric measurement method currently used for tank volume measurement has low measurement accuracy and low measurement efficiency. Although the flow method can Obtain high measurement accuracy, but there is also the problem of low measurement efficiency

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