Gordon, S.; Brooker, G. Using Schlieren Imaging and a Radar Acoustic Sounding System for the Detection of Close-in Air Turbulence. Sensors2023, 23, 8255.
Gordon, S.; Brooker, G. Using Schlieren Imaging and a Radar Acoustic Sounding System for the Detection of Close-in Air Turbulence. Sensors 2023, 23, 8255.
Gordon, S.; Brooker, G. Using Schlieren Imaging and a Radar Acoustic Sounding System for the Detection of Close-in Air Turbulence. Sensors2023, 23, 8255.
Gordon, S.; Brooker, G. Using Schlieren Imaging and a Radar Acoustic Sounding System for the Detection of Close-in Air Turbulence. Sensors 2023, 23, 8255.
Abstract
This paper presents a novel sensor for the detection and characterization of regions of air turbulence that would be of use to improve UAV stability in bad weather. It consists of a combined Schlieren imager and a Radar Acoustic Sounding System (RASS) to produce dual modality “images” of air movement within the measurement volume. The ultrasound modulated Schlieren imager consists of a strobed point light source, parabolic mirror, light-block and camera which are controlled by two laptops. It provides a fine scale projection of the acoustic pulse modulated air turbulence through the measurement volume. The narrow beam 40 kHz/ 17 GHz RASS produces spectra based on Bragg enhanced Doppler radar reflections from the acoustic pulse as it travels. Tests using artificially generated air vortices showed some disruption of the Schlieren image and of the RASS spectrogram. This should allow the higher resolution Schlieren images to identify the turbulence mechanisms that are disrupting the RASS spectra.
Keywords
ultrasound modulated schlieren imaging; radio acoustic sounding; RASS; imaging; ultrasound
Subject
Engineering, Other
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
