公开(公告)号：US20220283277A1

公开(公告)日：2022-09-08

申请号：US17685526

申请日：2022-03-03

Applicant: TOPCON CORPORATION

Inventor： Yasutoshi AOKI ,  Jun ABE ,  Yuichi OHASHI

IPC: G01S7/4912 ,  G01S17/34

Abstract: An electro-optical distance meter measures an electrical noise signal in a state where a received light amount adjusting means completely blocks light and measure a distance-measuring signal under a proper state of the adjusting means to calculate a distance by subtracting the electrical noise signal and an optical noise signal from the distance-measuring signal. The distance meter measures a first noise signal in a state where the adjusting means completely blocks light with a noise measuring jig having a unique jig-derived noise signal attached and a second noise signal in a state where the adjusting means transmits light most with the noise measuring jig attached, to calculate the optical noise signal by subtracting the first noise signal and the jig-derived noise signal from the second noise signal. The noise measuring jig is detachably attached to the electro-optical distance meter and removes reflected light entering the light receiving element when attached.