A Smartphone-Based Laser Measuring System for Gap and Flush Assessment in Car Body

This article presents a portable smartphone-based laser measurement system (SLM) for measuring gaps and flushes on a car body. The system is designed to replace conventional gauges that are used by human operators. The developed device consists of a smartphone and an off-the-shelf laser-line project...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2021-07, Vol.68 (7), p.6297-6307
Main Authors: Pham, Long Hoang, Tran, Duong Nguyen-Ngoc, Byun, Jin Young, Rhie, Chul Hong, Jeon, Jae Wook
Format: Article
Language:English
Subjects:
Automobiles
Automotive bodies
Cameras
Data transfer (computers)
Displacement measurement
Gauges
Hardware
image processing
instrumentation and measurement
Lasers
Measurement by laser beam
Sensors
smartphone
Smartphones
Software
Target recognition
Three dimensional printing
Uncertainty
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Summary:This article presents a portable smartphone-based laser measurement system (SLM) for measuring gaps and flushes on a car body. The system is designed to replace conventional gauges that are used by human operators. The developed device consists of a smartphone and an off-the-shelf laser-line projector held together by a three-dimensional-printed structure. It captures images of a laser line scattered on target surfaces, identifies the extreme points on the laser profiles, and obtains gap and flush measurements with minimal uncertainty. Since the smartphone is used as the operational unit, the measurement data can be stored and allows the capability for data transfer with other storage locations. Experiments were performed on the specimens and real cars to validate the application of the developed system. The measurement uncertainty on a real car was reported as \pm0.201 mm for gap and \pm0.154 mm for flush.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2020.2992971