Dr. Johan Eriksson Profile

Dr. Johan Eriksson

at FOI-Swedish Defence Research Agency

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Publications (6)

Proceedings Article | 2 November 2022 Presentation + Paper

Polarized dual single pixel imaging in SWIR

Ludwig Hollmann, David Gustafsson, Johan Eriksson, Carl Brännlund

Proceedings Volume 12272, 122720F (2022) https://doi.org/10.1117/12.2638957

KEYWORDS: Sensors, Digital micromirror devices, Polarization, Short wave infrared radiation, Cameras, Signal processing, Optical filters, Reconstruction algorithms, Mirrors, Image resolution

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Proceedings Article | 9 October 2019 Presentation + Paper

Ultraviolet transmissions measurements along a horizontal near ground path in Nordic environment

K. Ove Gustafsson, Johan Eriksson, Sebastian Möller

Proceedings Volume 11153, 1115305 (2019) https://doi.org/10.1117/12.2533449

KEYWORDS: Ozone, Ultraviolet radiation, Atmospheric modeling, Visibility, Environmental sensing

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Results are reported from a study of propagation near-ground within the solar blind ultraviolet wavelength range, including measurements of ultraviolet transmission along a horizontal path. In addition a discussion is presented about ozone data measured at 41 stations spread across Sweden, collected and stored by the Swedish Meteorological and Hydrological Institute (SMHI) and the Swedish Environmental Protection Agency (SEPA). In connection with this a simple statistical analysis of occurrence of the ground ozone is done.

The transmission measurements were made along slightly inclined path of 1830 m during the period from mid- November 2018 to mid-January 2019. The transmission values were collected together with weather data including measurement of ozone content in the atmosphere.

A simple model for ultraviolet transmission that takes into account both visibility and measured ozone content has been developed. This model shows a difference to the model found in the Modtran program, often used to predict atmospheric transmissions in several wavelength bands including ultraviolet wavelengths. Overall, the new model shows a weaker connection between ultraviolet extinction, ozone content and visibility compared to Modtran.

Data from the countrywide ozone measurements as well as data collected in connection with transmission measurement showed variations in the atmospheric ground-level ozone content that are not easily explained from weather parameters alone. Reports, see for instance [2], state that it is volatile hydrocarbons and other molecules, both natural and anthropogenic, along with solar radiation that influence the amount of ozone. The variation of both volatile hydrocarbons and solar radiation together with a variation in wind direction and speed have an impact of varying transmission.

In practice all measured ozone values during conditions with low relative humidity were relatively high. There was also a high correlation between high ozone values and high wind velocities. The relation between ultraviolet extinction deduced from measurements and the corresponding values for the visual wavelength range and corresponding values calculated using Modtran show different relationships. The transmission measurements in the ultraviolet wavelengths range showed that the amount of aerosols has no major significance for the ultraviolet extinction at visual ranges above 15 km.

Due to the short period of data collection, mostly fall-like weather conditions, the conclusions that can be drawn from the measurements are limited. Furthermore, the ground-level horizontal measurements make it very hard to draw conclusions about the ultraviolet transmission at higher air layers.

Proceedings Article | 9 October 2018 Presentation + Paper

Optical polarization and the dependence of angle of incidence for different surfaces: comparison between different wavelengths from UV to IR

Tomas Hallberg, Johan Eriksson, Stefan Björkert, Hans Kariis

Proceedings Volume 10794, 107940U (2018) https://doi.org/10.1117/12.2327022

KEYWORDS: Polarimetry, Polarization, Reflectivity, Thin film coatings, Integrating spheres, Spectroscopy, Aluminum, Sensors, Light scattering, Bidirectional reflectance transmission function

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Proceedings Article | 5 October 2017 Paper

Optical polarization: background and camouflage

Christina Åkerlind, Tomas Hallberg, Johan Eriksson, Hans Kariis, David Bergström

Proceedings Volume 10432, 1043204 (2017) https://doi.org/10.1117/12.2278767

KEYWORDS: Polarimetry, Polarization, Infrared signatures, Sensors, Camouflage, Infrared radiation, Infrared sensors, Infrared technology, Sensor technology, Infrared imaging

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Proceedings Article | 5 October 2017 Paper

Characterization and performance of a LWIR polarimetric imager

Johan Eriksson, David Bergström, Ingmar Renhorn

Proceedings Volume 10434, 1043407 (2017) https://doi.org/10.1117/12.2278502

KEYWORDS: Polarimetry, Imaging systems, Sensors, Long wavelength infrared, Infrared signatures, Infrared imaging, Thermography, Infrared radiation, Calibration, Electro optical sensors

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Proceedings Article | 21 June 2015 Paper

Radiometric uncertainty of radiance measured with infrared cameras under variable ambient conditions

Thomas Svensson, Henrik Larsson, Johan Eriksson

Proceedings Volume 9526, 95260E (2015) https://doi.org/10.1117/12.2184861

KEYWORDS: Cameras, Calibration, Temperature metrology, Sensors, Infrared cameras, Black bodies, Optical filters, Infrared radiation, Imaging systems, Atmospheric optics

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Showing 5 of 6 publications

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