Next Article in Journal
Raised Pedestrian Crossings: Analysis of Their Characteristics on a Road Network and Geometric Sizing Proposal
Next Article in Special Issue
A Layer-Wise Strategy for Indoor As-Built Modeling Using Point Clouds
Previous Article in Journal
Estimating Airway Resistance from Forced Expiration in Spirometry
Previous Article in Special Issue
Airborne Waveform Lidar Simulator Using the Radiative Transfer of a Laser Pulse
Open AccessArticle

Light Transmission in Fog: The Influence of Wavelength on the Extinction Coefficient

Cerema, Equipe-projet STI, 8-10, rue, Bernard Palissy, CEDEX 2, F-63017 Clermont-Ferrand, France
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Appl. Sci. 2019, 9(14), 2843; https://doi.org/10.3390/app9142843
Received: 29 March 2019 / Revised: 25 June 2019 / Accepted: 27 June 2019 / Published: 16 July 2019
(This article belongs to the Special Issue LiDAR and Time-of-flight Imaging)
Autonomous driving is based on innovative technologies that have to ensure that vehicles are driven safely. LiDARs are one of the reference sensors for obstacle detection. However, this technology is affected by adverse weather conditions, especially fog. Different wavelengths are investigated to meet this challenge (905 nm vs. 1550 nm). The influence of wavelength on light transmission in fog is then examined and results reported. A theoretical approach by calculating the extinction coefficient for different wavelengths is presented in comparison to measurements with a spectroradiometer in the range of 350 nm–2450 nm. The experiment took place in the French Cerema PAVIN BPplatform for intelligent vehicles, which makes it possible to reproduce controlled fogs of different density for two types of droplet size distribution. Direct spectroradiometer extinction measurements vary in the same way as the models. Finally, the wavelengths for LiDARs should not be chosen on the basis of fog conditions: there is a small difference (<10%) between the extinction coefficients at 905 nm and 1550 nm for the same emitted power in fog. View Full-Text
Keywords: fog; LiDAR; wavelength; extinction coefficient; meteorological optical range; spectroradiometer; droplet size distribution fog; LiDAR; wavelength; extinction coefficient; meteorological optical range; spectroradiometer; droplet size distribution
Show Figures

Figure 1

MDPI and ACS Style

Duthon, P.; Colomb, M.; Bernardin, F. Light Transmission in Fog: The Influence of Wavelength on the Extinction Coefficient. Appl. Sci. 2019, 9, 2843.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop