Latest optical methods for industrial dimensional metrology

Abstract

Applying optical methods to a simple inspection problem, such as the presence or absence of an assembly component, is likely the least restrictive of any machine vision application. The setup, alignment, and components can be made very simply by using any feature which appears different if the component of interest is present. Gaging to verify proper construction, however, can be a much more complicated task. To take advantage of the capability of machine vision and other optical technologies, some flexibility in part position, orientation, and speed of presentation may be desired. This paper will review the types of methods available from optical methods for industrial dimensional metrology. The emphasis of the discussion will be 2D and 3D gaging applications.

Uncertainties of an Automated Optical 3D Geometry Measurement, Modeling, and Analysis Process for Mistuned Integrally Bladed Rotor Reverse Engineering

“…Accuracy of these systems has been shown to be within 0.0001 in. (2.5 ^im) [17]. The optical measurement system used for this work is shown in Fig.…”

Experimental Validation of a Model Update Procedure Focusing on Small Geometric Deviations

“…These high resolution measuring cameras are well proven in engineering practice and represent a state of the art measurement solution for reversed engineering. Precision of such a system has been proven to be within 2.5 µm [17]. One major advantage of such a non contact solution is the possibility to get a large number of coordinate informations very fast.…”

“…Furthermore this technology allows capturing coordinates from areas which are difficult to access and could not be taken into account using conventional coordinate measurement machines. More details, advantages and disadvantages concerning optical coordinate measurements are published in [17][18][19]. The experimental setup which was used to get the results presented in the following includes an optical scan head, a robot arm for moving the scan head automatically and a rotatable table that carries the test blisk.…”

Errors in non-contact sensor measurements due to misalignment and scanning methodology

“…Limited work has been published to characterize objectively non-contact sensor performance due to the wide range of technologies used in the sensors and the range of intended applications of the sensors [2,3]. Similarly, little work has been published to characterize objectively the performance of dimensional inspection systems using non-contact sensors.…”

“…Additionally, many non-contact sensors are capable of measurement accuracy on the scale 5 μm or better [1]. There exist a variety of different non-contact measurement technologies that are described in several review papers [1][2][3]. These extensive papers review most of the available non-contact sensors and measuring techniques.…”