Journal
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
Volume 49, Issue 7, Pages 2147-2157Publisher
WILEY
DOI: 10.1002/cta.3009
Keywords
analog signal processing; capacitive effect; elastomer based sensor; MEMS; motion sensor; PDMS; Sallen– Key
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By designing a capacitive motion sensor and a read-out circuit using PDMS as the sensor material, accurate detection of human movements and obtaining different motion patterns can be achieved.
A capacitive motion sensor that can detect human walking and motions up to a certain distance was designed using polydimethylsiloxane (PDMS) as the primary sensor material. A read-out circuit was designed to detect capacitive coupling with the sensor material caused by the motion in the surrounding. The read-out circuit consists of sensing, filtering, and amplifying stages. A high-pass filter was used to avoid DC components, and to eliminate adverse impacts of 50Hz noise in the sensing signal, a sixth-order low-pass filter consisting of active Sallen-Key and passive RC filters was utilized. The signals obtained from the complete read-out circuit revealed that the sensor system could accurately detect human movements up to 2 m away. Also, different signal patterns were obtained from the output of the sensor system for various human motions.
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