TY - JOUR
T1 - Moisture sensor based on heat transfer possessing insusceptibility to coating materials on skin
AU - Hosono, Minako
AU - Isozaki, Akihiro
AU - Katoh, Koki
AU - Ichikawa, Yasumasa
AU - Iwase, Eiji
AU - Matsumoto, Kiyoshi
AU - Shimoyama, Isao
N1 - Funding Information:
The photolithography masks were fabricated using an EB lithography apparatus (F5112 + VD01) donated by the Advantest Corporation at the VLSI Design and Education Center (VDEC) of the University of Tokyo. This work was supported by JSPS KAKENHI Grant Number 23650067 .
Publisher Copyright:
© 2015 Published by Elsevier B.V.
PY - 2015/11/1
Y1 - 2015/11/1
N2 - This paper presents a thermal-based skin moisture sensor that is insusceptible to thin coating materials on skin. To realize this sensor, numerical simulations are performed to evaluate the influence of surface-coating materials, such as Vaseline moisturizer, on the heat transfer from a heat source in the sensor to the skin. The simulation results show that the influence of the thin Vaseline layer on the temperature change of the heat source is negligible, but the existence of air gaps between the sensor and the skin drastically interrupts the heat transfer. Considering the simulation results, the thermal-based skin moisture sensor is designed and fabricated with a microelectromechanical systems (MEMS) pressure sensor to avoid heat transfer interruption due to air gaps. The measurement results of water content in a water-absorbing polymer, covered with a 10-μm-thick polyethylene film, show that the moisture sensor can assess the water content of materials that are covered with a thin layer. Finally, we demonstrate the hydration measurement of skin with Vaseline coating. The measurement results confirm the potential of the moisture sensor to measure the water content of skin covered with moisturizing substances.
AB - This paper presents a thermal-based skin moisture sensor that is insusceptible to thin coating materials on skin. To realize this sensor, numerical simulations are performed to evaluate the influence of surface-coating materials, such as Vaseline moisturizer, on the heat transfer from a heat source in the sensor to the skin. The simulation results show that the influence of the thin Vaseline layer on the temperature change of the heat source is negligible, but the existence of air gaps between the sensor and the skin drastically interrupts the heat transfer. Considering the simulation results, the thermal-based skin moisture sensor is designed and fabricated with a microelectromechanical systems (MEMS) pressure sensor to avoid heat transfer interruption due to air gaps. The measurement results of water content in a water-absorbing polymer, covered with a 10-μm-thick polyethylene film, show that the moisture sensor can assess the water content of materials that are covered with a thin layer. Finally, we demonstrate the hydration measurement of skin with Vaseline coating. The measurement results confirm the potential of the moisture sensor to measure the water content of skin covered with moisturizing substances.
KW - Heat transfer
KW - Skin moisture
KW - Water content measurement
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U2 - 10.1016/j.sna.2015.10.012
DO - 10.1016/j.sna.2015.10.012
M3 - Article
AN - SCOPUS:84945132060
VL - 235
SP - 265
EP - 272
JO - Sensors and Actuators, A: Physical
JF - Sensors and Actuators, A: Physical
SN - 0924-4247
ER -