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Darren Gould, Adam Sklorz, Christian Schröder, Mirco Meiners, Wolfgang Benecke, Walter Lang
Challenges in the Development of Passive RF-Sensors
Keywords: wireless sensor, passive RF-Sensor, magnetically coupled sensors
The sensor system described in this article is used to detect and predict the formation of condensation on the windshield of an automobile. The humidity in the cabin is measured with an active dewpoint sensor, the temperature against the windshield is measured passively, and the data is forwarded to the onboard computer. After analysis, the onboard computer can regulate the climate control system thereby preventing the accumulation of condensation. The temperature sensor is passively supplied with energy through a magnetic coupling and functions up to a maximum distance of 4cm from the magnetic field generator. The passive sensor measures with a maximum power consumption of 1.95mW in a temperature span of -20ºC until 80ºC with an accuracy of 1.5ºC.
tm – Technisches Messen, Oldenbourg Wissenschaftsverlag
Print ISSN: 0171-8096
Volume: 74, 12/2007
Pages: 606 - 612