Most objects masked by vegetation are not discoverable for standard, centimeter wavelength radars. Conversely, radar systems operating at wavelengths in the order of one meter provide a good penetration through vegetation. In this paper, we propose a novel electronic antenna switch for low-cost pulse radar systems, operating either in the VHF or in the UHF range. The switch provides both modulated pulses to be transmitted and a locally generated carrier for demodulating the received signals. The switch configuration was successfully tested, separately and as a part of a radar system.
Volatile Organic Compounds (VOC) affect human health in various forms depending on the type of compound (benzene, formaldehyde, etc.). These compounds range from toxic to very toxic, and human health depends on the level and duration of exposure to these toxic pollutants. The adverse effects of long-term human exposure affect kidney and liver, nervous system, and in the case of short-term impacts affect eyes and memory. The purpose of the article is to assess current sensor technologies which allow measuring VOCs concentrations in exposed areas and to analyze the health impacts of vulnerable groups, elderly and children. Measurements are performed using the Libelium sensor. Using relevant statistic indicators on a variate set of measured metrics, we made an appreciation of the correlation between the analysis of value measurement with Libelium sensors installed indoor of a building in two separate rooms and appreciated the relevance of the measured values.
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