Method and device for detecting jump or gap width by using handheld contourgraph

By introducing a position sensing unit and display device into a handheld profilometer, and combining optical measurement technology with a gravity sensor to correct the posture, the measurement error problem caused by inaccurate positioning in existing technologies is solved, and accurate measurement of step differences and gap widths of large or special structural objects is achieved.

CN121783040APending Publication Date: 2026-04-03SHANGHAI SENGO ADVANCED TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-25
Publication Date
2026-04-03

AI Technical Summary

Technical Problem

Existing handheld contour measuring instruments suffer from inaccurate positioning, leading to large errors in the detection results. This is especially true when measuring the step differences and gap widths of large or special structural objects, where they cannot measure them accurately.

Method used

The detection system, consisting of a light emitter, an image acquisition device, and an optical lens, combined with a position sensing unit and a display device, establishes a baseline measurement line, acquires multiple sampling lines, selects the sampling line with the smallest tilt angle as the measurement basis, and uses a gravity sensor to correct the posture, ensuring accurate measurement.

Benefits of technology

It improves the measurement accuracy of handheld profilometers when inspecting large or special structural objects, reduces errors, and enables more accurate measurement of step difference and gap width.

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Abstract

The invention discloses a method and device for detecting order difference or gap width by using a handheld contourgraph, the handheld contourgraph comprises a light emitter, an image acquisition device and an optical lens, light emitted by the light emitter is reflected by a detected object and then is guided into the image acquisition device through the optical lens, and the image acquisition device is connected with the handheld contourgraph. The size characteristics of a detected object are determined through information acquired by the image acquisition device, wherein the method for detecting the order difference or the gap width by utilizing the handheld contourgraph comprises the following steps of: establishing a reference measurement line; collecting a plurality of sampling lines according to the position and the angle when the reference measuring line is collected by using a handheld contourgraph; calculating the inclination angle of each sampling line relative to the reference measurement line in a set measurement straight line area, and selecting the sampling line with the minimum inclination angle within a set threshold range; the selected sampling line is used as measurement data, and the order difference or the gap width is calculated.
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