Leica Total Station Prism

The ATR (Automatic Target Sight) of Leica's automatic total station (also known as measurement robot) is an important function of Leica's high-end total station. This function enables the instrument to accurately aim at the prism as long as it is roughly aimed at the prism during field surveys. Realize measurement. However, many surveyors have found that when using the ATR function, the crosshairs of the instrument are often not precisely aimed at the center of the prism, thus worrying about affecting the measurement accuracy.
When the Leica total station accurately searches for and collimates the prism, the rotation of the instrument is driven by a servo motor. When the ATR function of the instrument detects the prism, the difference between the center position of the prism and the horizontal and vertical positions of the crosshairs is fed back. To the servo motor drive circuit, the motor starts to rotate, and the instrument turns the crosshair to the center of the prism. However, in the field measurement, due to various environmental interferences on the site, the image of the prism is not stable. If the instrument is required to accurately lock the image center of the prism, the instrument will always be in a state of small rotation of the prism without stopping, so that the instrument will also It cannot be in a stable state for distance measurement. For this reason, when the Leica total station is designed to automatically collimate the prism, when the position of the crosshair center and the prism image center are very small, the instrument no longer rotates, but a small difference Determined and corrected in subsequent measurements. Therefore, when the Leica survey robot is automatically aiming at the target, the crosshairs and the center of the prism may not necessarily coincide, but the accuracy of the measurement results will not be affected.