Transepidermal water loss sensor based on fast dew point hygrometer

Jachowicz, Ryszard; Weremczuk, Jerzy; Tarapata, Grzegorz

doi:10.1016/j.sna.2005.04.001

Cited by 13 publications

(7 citation statements)

References 2 publications

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“…The artificial skin (Fig. 5a ) use “wet-cup method” to calibrate the sweat rate sensing ability, which is a general calibration method 24 , 31 , 32 , 48 . The wet-cup method provides quantitative sweat rate with a unit of g/m 2 h, thus considered as reference methods to sweat rate detection.…”

Section: Methodsmentioning

confidence: 99%

Wearable Sweat Rate Sensors for Human Thermal Comfort Monitoring

Sim

Yoon

Cho

2018

Sci Rep

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We propose watch-type sweat rate sensors capable of automatic natural ventilation by integrating miniaturized thermo-pneumatic actuators, and experimentally verify their performances and applicability. Previous sensors using natural ventilation require manual ventilation process or high-power bulky thermo-pneumatic actuators to lift sweat rate detection chambers above skin for continuous measurement. The proposed watch-type sweat rate sensors reduce operation power by minimizing expansion fluid volume to 0.4 ml through heat circuit modeling. The proposed sensors reduce operation power to 12.8% and weight to 47.6% compared to previous portable sensors, operating for 4 hours at 6 V batteries. Human experiment for thermal comfort monitoring is performed by using the proposed sensors having sensitivity of 0.039 (pF/s)/(g/m2h) and linearity of 97.9% in human sweat rate range. Average sweat rate difference for each thermal status measured in three subjects shows (32.06 ± 27.19) g/m2h in thermal statuses including ‘comfortable’, ‘slightly warm’, ‘warm’, and ‘hot’. The proposed sensors thereby can discriminate and compare four stages of thermal status. Sweat rate measurement error of the proposed sensors is less than 10% under air velocity of 1.5 m/s corresponding to human walking speed. The proposed sensors are applicable for wearable and portable use, having potentials for daily thermal comfort monitoring applications.

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Section: Methodsmentioning

confidence: 99%

Wearable Sweat Rate Sensors for Human Thermal Comfort Monitoring

Sim

Yoon

Cho

2018

Sci Rep

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“…The skin, being the largest and the outermost organ of the human body, serves multiple defensive and regulatory functions (1, 2), such as protection against external mechanical aggressions (3, 4), non‐specific immunization, excretion to maintain moisture and temperature balance, synthesis of vitamin D, etc (5).…”

mentioning

confidence: 99%

Efficacy of anti-wrinkle products in skin surface appearance: a comparative study using non-invasive methods

Ferreira

Costa

Bahia

2010

Skin Research and Technology

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“…While the pressure and conductance sensors are recovering into the dormant status instantaneously, the humidity sensor recovery requires time to the base line. Since we used the closed chamber principle (CCP) method [4,32] for the TEWL measurement, each measurement requires the ventilation time to recover to initial humidity level after the former measurement. The present pen-type device needs about 1 min ventilation time for each measurement to get repeatable slopes.…”

Section: Resultsmentioning

confidence: 99%

“…Before the skin measurement, the present devices are needed to be calibrated. For TEWL measurement, Wet-cup method [31,32,33] has been used. Briefly, the wet-cup method uses a water-filled petri-dish covered by a semi-permeable membrane.…”

Section: Methodsmentioning

confidence: 99%

Portable Skin Analyzers with Simultaneous Measurements of Transepidermal Water Loss, Skin Conductance and Skin Hardness

Sim

Kim

et al. 2019

Sensors

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Simultaneous measurement of skin physiological and physical properties are important for the diagnosis of skin diseases and monitoring of human performance, since it provides more comprehensive understanding on the skin conditions. Current skin analysis devices, however, require each of probes and unique protocols for the measurement of individual skin properties, resulting in inconvenience and increase of measurement uncertainty. This paper presents a pen-type skin analyzing device capable tomeasure three key skin properties at the same time: transepidermal water loss (TEWL), skin conductance, and skin hardness. It uses a single truncated hollow cone (THC) probe integrated with a humidity sensor, paired electrodes, and a load cell for the multimodal assessment of the skin properties. The present device measured TEWL with a sensitivity of 0.0068 (%/s)/(g/m2/h) and a linearity of 99.63%, conductance with a sensitivity of 1.02 µS/µS and a linearity of 99.36%, and hardness with a sensitivity of 0.98 Shore 00/Shore 00 and a linearity of 99.85%, within the appropriate ranges for the human skin. The present pen-type device has a high potential for the skin health diagnosis as well as the human performance monitoring applications.

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Transepidermal water loss sensor based on fast dew point hygrometer

Cited by 13 publications

References 2 publications

Wearable Sweat Rate Sensors for Human Thermal Comfort Monitoring

Wearable Sweat Rate Sensors for Human Thermal Comfort Monitoring

Efficacy of anti-wrinkle products in skin surface appearance: a comparative study using non-invasive methods

Portable Skin Analyzers with Simultaneous Measurements of Transepidermal Water Loss, Skin Conductance and Skin Hardness

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