Size and surface pressure measuring method and size and surface pressure measuring device based on pressure sensitive paint and light field camera

Abstract

The invention provides a 3D size and surface pressure measuring method based on a pressure sensitive paint and a light field camera. The method comprises a picture obtaining step in which a pressure signal light field picture and a depth signal light field picture of a model are obtained; a surface pressure distribution calculating step in which a model surface pressure distribution map of the model is calculated from the pressure signal light field picture; a surface depth distribution calculation step in which a model surface depth distribution map is calculated from the depth signal light field picture; and a 3D pressure distribution generation step in which information of the model surface pressure distribution map is fused with information the model surface depth distribution map to generate a 3D model pressure distribution map. The invention also provides a measuring device for realizing the measuring method. Thus, 3D size and surface pressure distribution fused data of the modelcan be obtained via single-point shooting by the single light field camera, and compared with shooting requirements of other pressure-sensitive paints and 3D reconstruction, the system complexity isgreatly reduced, and the measuring efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of aerodynamic measurement, in particular to a method and device for measuring size and surface pressure based on pressure-sensitive paint and a light field camera. Background technique [0002] Pressure-sensitive paint (PSP), as a non-contact and high-resolution surface pressure measurement technology, has been widely used in aerodynamic experimental research since it was proposed in the 1980s. Unlike traditional pressure gauges or pressure sensors that can only obtain pressure data point by point, pressure-sensitive paint can measure the pressure distribution on the surface of complex models at one time. This technique takes advantage of the oxygen quenching properties of fluorescent molecules. Under suitable shooting conditions, the measurement accuracy is theoretically only limited by the accuracy of the photodetector used. By using suitable pressure-sensitive paint substrates and imaging devices, stati...

AI Technical Summary

Problems solved by technology

[0003] The development of pressure-sensitive paint technology has been continuously improved, but the errors caused by factors such as paint temperature sensitivity, model offset deformation, light source instability and photodegradation cannot be completely eliminated

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