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.
Highlights
Multi-sensor metrology is widely used in high-precision dimensional measurement, as workpieces become increasingly complicated and complex
This paper is structured as follows: in Section 2, we explore the problems that exist with the use of a reference sphere for high-precision measurement; in Section 3, we describe the registration principle; in Section 4, we present the mathematical description given to analyze the error propagation; in Section 5, the simulations and real experiments conducted to verify the composite standard are discussed; and Section 6 concludes the paper
A registration method based on a composite standard was presented
Summary
Multi-sensor metrology is widely used in high-precision dimensional measurement, as workpieces become increasingly complicated and complex. Registration methods can be classified into two major categories: registration based on material gauges and self-calibration [2] With the former, coordinate systems are aligned with the help of common feature points. The two sensors were unified into one coordinate system by measuring a common sphere, so the laser displacement sensor could guide the touch probe. This paper is structured as follows: in Section 2, we explore the problems that exist with the use of a reference sphere for high-precision measurement; in Section 3, we describe the registration principle; in Section 4, we present the mathematical description given to analyze the error propagation; in Section 5, the simulations and real experiments conducted to verify the composite standard are discussed; and Section 6 concludes the paper
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