US 12,460,944 B2
Device for calibrating laser level
Xin Shi, Shanghai (CN); and David Xing, Dover, NJ (US)
Assigned to NORTHWEST INSTRUMENT INC., Dover, NJ (US)
Appl. No. 18/044,115
Filed by NORTHWEST INSTRUMENT INC., Dover, NJ (US)
PCT Filed Jul. 6, 2021, PCT No. PCT/CN2021/104658
§ 371(c)(1), (2) Date Mar. 6, 2023,
PCT Pub. No. WO2022/142244, PCT Pub. Date Jul. 7, 2022.
Claims priority of application No. 202011629188.8 (CN), filed on Dec. 31, 2020.
Prior Publication US 2023/0314172 A1, Oct. 5, 2023
Int. Cl. G01C 15/04 (2006.01); G01C 15/00 (2006.01); G01C 25/00 (2006.01)
CPC G01C 25/00 (2013.01) [G01C 15/004 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A device for calibrating a laser level comprising:
a base platform configured to support the laser level that is to be mounted on the base platform at a first position;
a laser detector arranged at a second position of the base platform and configured to receive a laser; and
an optical path extension device arranged at a third position between the laser level and the laser detector and configured to receive the laser emitted by the laser level, project the laser to the laser detector after an optical path of the laser is adjusted by the optical path extension device,
wherein the base platform further includes a control device configured to determine whether the laser level needs to be calibrated based on a simulated distance, a first angle, and a deviation distance determined by positions of lasers emitted by the laser level at the laser detector before and after a rotation of the laser level by the first angle, the simulated distance being determined by position data of the first position, the second position, and the third position and an optical path extension multiplication factor of the optical path extension device.