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Updated: Apr 3, 2026

Assembly, Tuning and Use of an Apertureless Near Field Infrared Microscope for Protein Imaging
Published on: November 25, 2009
Active and passive short-wave infrared and near-infrared imaging for horizontal and slant paths close to ground
Ove Steinvall1, Magnus Elmqvist, Tomas Chevalier
1Division of Sensors and Electronic Warfare, Swedish Defense Research Agency, Linköping, Sweden. ove.steinvall@foi.se
Abstract:
This paper investigates active and passive short-wave infrared (SWIR) imaging for slant paths close to ground. The main sensor, a gated SWIR camera, was collecting both passive and active images along a 2 km long path over an airfield and also from our rooftop laboratory looking over open fields. For some investigations we also used a gated system working in the near-infrared region and thermal as well as color CCD cameras. The sensor was elevated by a lift in steps from 1.6-13.5 m or placed in a rooftop laboratory 13 m above ground. Targets were resolution charts and man targets. The turbulence was measured along the path with anemometers and scintillometers. The image performance was evaluated by measurement of the image blur and also by performing observer perception tests. The results reveal a strong dependence on the sensor height especially during daytime.
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