Invention Grant
- Patent Title: Method for calibrating measuring element, method for evaluating road surface properties, and apparatus for evaluating road surface properties
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Application No.: US15850212Application Date: 2017-12-21
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Publication No.: US11385337B2Publication Date: 2022-07-12
- Inventor: You Sasaki , Tadayuki Ito
- Applicant: Topcon Corporation
- Applicant Address: JP Tokyo
- Assignee: Topcon Corporation
- Current Assignee: Topcon Corporation
- Current Assignee Address: JP Tokyo
- Agency: Chiesa Shahinian & Giantomasi PC
- Priority: JPJP2017-038532 20170301
- Main IPC: G01S7/48
- IPC: G01S7/48 ; G01S7/497 ; G01S17/89 ; G01B11/24 ; G01S17/42 ; G01S7/481

Abstract:
A method for calibrating unevenness of a plurality of measuring elements in an apparatus for evaluating road surface property having a plurality of measuring elements repeats steps of computing separation quantities from a calibration reference plane on a reference area regarding all measuring elements; determining a measuring element where the separation quantity is maximum from among all the measuring element to calibrate the measuring element such that a difference between point cloud data produced from a measurement value of the measuring element where the separation quantity is maximum and the calibration reference plane becomes equal or less than a predetermined value, producing a new calibration reference plane from the measurement values of the measuring elements including the calibrated measuring element, until RMS of point cloud data does not change.
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