Assessment of the metrological performance of an in-situ storage image sensor ultra-high speed camera for full-field deformation measurements

Rossi, M., Pierron, F. and Forquin, P. (2014) Assessment of the metrological performance of an in-situ storage image sensor ultra-high speed camera for full-field deformation measurements. Measurement Science and Technology, 25 (2), 25401. (doi:10.1088/0957-0233/25/2/025401).

Abstract

Ultra-high speed (UHS) cameras allow us to acquire images typically up to about 1 million frames s ?1 for a full spatial resolution of the order of 1 Mpixel. Different technologies are available nowadays to achieve these performances, an interesting one is the so-called in situ storage image sensor architecture where the image storage is incorporated into the sensor chip. Such an architecture is all solid state and does not contain movable devices as occurs, for instance, in the rotating mirror UHS cameras. One of the disadvantages of this system is the low fill factor (around 76% in the vertical direction and 14% in the horizontal direction) since most of the space in the sensor is occupied by memory. This peculiarity introduces a series of systematic errors when the camera is used to perform full-field strain measurements. The aim of this paper is to develop an experimental procedure to thoroughly characterize the performance of such kinds of cameras in full-field deformation measurement and identify the best operative conditions which minimize the measurement errors. A series of tests was performed on a Shimadzu HPV-1 UHS camera first using uniform scenes and then grids under rigid movements. The grid method was used as full-field measurement optical technique here. From these tests, it has been possible to appropriately identify the camera behaviour and utilize this information to improve actual measurements.

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Contributors

Author: F. Pierron

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