Abstract
Measurements of pressure-sensitive paint (PSP) have been performed using new or non-scientific imaging technology based on machine vision tools. Machine vision camera systems are typically used for automated inspection or process monitoring. Such devices offer the benefits of lower cost and reduced size compared with typically scientific-grade cameras; however, their optical qualities and suitability have yet to be determined. This research intends to show relevant imaging characteristics and also show the applicability of such imaging technology for PSP. Details of camera performance are benchmarked and compared to standard scientific imaging equipment and subsequent PSP tests are conducted using a static calibration chamber. The findings demonstrate that machine vision technology can be used for PSP measurements, opening up the possibility of performing measurements on-board small-scale model such as those used for wind tunnel testing or measurements in confined spaces with limited optical access.
Highlights
Pressure-sensitive paint (PSP) measurements have been made to great effect in many areas of aerodynamic research
In mind, which this study to exceed investigate the imaging characteristics machine vision cameras, this study aims to investigate the imaging characteristics of machine vision cameras, compare compare their characteristics to scientific, cooled cameras and demonstrate their suitability fortheir characteristics scientific, cooled cameras and demonstrate their suitability for PSP measurements by measurementstoby performing static calibrations
The signal-to-noise ratio is clearly decreased as the pressure increases, something to be expected given the nature of oxygen quenching reducing the luminescent output of the PSP
Summary
Pressure-sensitive paint (PSP) measurements have been made to great effect in many areas of aerodynamic research. One area of interest is investigations of unsteady flows [2,3] where steady components of pressure but oscillating components and even aerodynamic modal shapes have been measured effectively. Traditional (steady-state) PSP systems can often be large installations comprising of up to a dozen cameras with a similar number of lamps. Each of these camera and lamp pairs cost tens of thousands of pounds which, when added up to a total cost of a system, can run up to £500k.
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