Microsensor for the measurement of water content in the human skin

A device for skin moisture and environment humidity detection

“…According to Sekiguchi et al [13], the capacitance variation decreases with increasing frequency from 100 kHz to 2 MHz. The lower measuring frequency enhances the output capacitance and makes it easy to observe the capacitance variation.…”

“…According to Sekiguchi et al [13] the conductive wire was fixed behind the active sensing area by the epoxy resin. The copper wires were connected with the sensing electrodes using conductive epoxy which was coated beside the substrate.…”

“…The conductive wires were through the holes and were fixed in the bonding area perpendicular to the substrate. Thus, the methods of bonding to fabricate skin moisture sensors [13,20] are still complex. To simply the bonding technique of the skin moisture sensor, this study presents a practical method to solve the problem.…”

“…If the spring is pressed slowly, the response time would be increased. In order to avoid the problem, the force applied on the skin should reach to be constant as soon as possible [13,24]. Fig.…”

“…In 2001, Sekiguchi et al [13] presented a skin moisture sensor made by using a sputter system and pointed out that the measuring frequencies influenced the output capacitance obviously. In the same year (2001), Hanreich et al [20] provided a kind of bonding technique for human skin humidity sensors to make the sensor surface absolutely flat.…”