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Sensors 2018, 18(4), 1220; doi:10.3390/s18041220

Multi-Sensor Registration in High-Precision CMM Based on a Composite Standard

1
State Key Laboratory of Precision Measuring Technology and Instrument, School of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China
2
TZTEK Technology Co. Ltd., Suzhou 215153, China
*
Author to whom correspondence should be addressed.
Received: 8 March 2018 / Revised: 6 April 2018 / Accepted: 11 April 2018 / Published: 16 April 2018
(This article belongs to the Section Physical Sensors)
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Abstract

Registration is a critical step in multi-sensor dimensional measurement. As the accuracy of registration directly impacts the quality of final results, a reference sphere as a common standard is problematic in high-precision registration. In this paper, a novel method based on a composite standard is proposed to fuse the multiple heterogeneous sensors in high-precision coordinate measuring machines (CMMs), which will void the drawbacks of a reference sphere. The composite standard consists of a cone and cylinder, which share a same central axis. To ensure high precision in the submicron range, or better, the standard is manufactured by an ultra-precision machine. Three features of the composite standard are inspected by three sensors: a video camera (VC), a tactile probe (TP), and a chromatic confocal displacement sensor (CC). All features will concentrate on a common point through which the relation between the three sensors will be obtained. The errors of each measurement were analyzed theoretically, and simulations and real experiments were carried out to verify the composite standard. This study demonstrates that the proposed registration method is stable and that the standard has potential use for the registration of multiple sensors in high-precision dimensional measurement. View Full-Text
Keywords: registration; multi-sensor; high-precision; composite standard registration; multi-sensor; high-precision; composite standard
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Zhao, Y.; Wang, Y.; Ye, X.; Wang, Z.; Fu, L.; Liu, C.; Wang, Z. Multi-Sensor Registration in High-Precision CMM Based on a Composite Standard. Sensors 2018, 18, 1220.

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