Abstract
We describe a flexible capacitance-type sensor that can detect an approaching human without contact, fabricated by developing and applying duplex conductive-ink printing to a film substrate. The results of our calculations show that the difference in size between the top and bottom electrodes of the sensor allows for the spatial extension of the electric field distribution over the electrodes. Hence, such a component functions as a proximity sensor. This thin and light device with a large form factor can be arranged at various places, including curved surfaces and the back of objects such that it is unnoticeable. In our experiment, we attached it to the back of a bed, and found that our device successfully detected the breathing of a subject on the bed without contacting his body. This should contribute to reducing the physical and psychological discomfort among patients during medical checks, or when their condition is being monitored.
Highlights
To a wall or ceiling, and radiates microwaves to human bodies
We arranged the electrodes of the sensor at the top and bottom surfaces of a polyethylene terephthalate (PET) film fabricated by a novel yet simple duplex printing technique, which is a combination of screen printing and screen-offset printing[31,32]
We assumed that Alternating current (AC) voltage (5 V, 200 kHz) was applied to the top electrodes
Summary
To a wall or ceiling, and radiates microwaves to human bodies. The duration of breathing can be calculated by measuring and analysing the reflected waves[8]. It cannot be attached to a curved surface Such a substrate has low impact resistance and can break . Such a sensor component is expensive because it is fabricated by conventional vacuum and photolithographic processes, and the vacuum processes require considerable amounts of energy to attain and maintain low pressure. We arranged the electrodes of the sensor at the top and bottom surfaces of a polyethylene terephthalate (PET) film fabricated by a novel yet simple duplex printing technique, which is a combination of screen printing and screen-offset printing[31,32] This sensor can be used to detect an approaching person, it can be applied to detect breathing. We show that our sensor can accurately detect the duration of breathing of a person, as an instance of its many promising applications
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