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Wearable Perspiration Characteristic Sensor Using Bi-Directional Driver Circuit | IEEE Conference Publication | IEEE Xplore

Wearable Perspiration Characteristic Sensor Using Bi-Directional Driver Circuit

Publisher: IEEE

Abstract:

The number of patients with heat stroke has been increasing, and it is one of the social problems. Heat stroke frequently occurs indoors and often goes unnoticed, particu...View more

Abstract:

The number of patients with heat stroke has been increasing, and it is one of the social problems. Heat stroke frequently occurs indoors and often goes unnoticed, particularly at home. Therefore, our goal is to prevent heat stroke by developing a wearable sensor that can measure the volume and salinity of perspiration. In the proposed sensor, textile-based electrodes with conductive adhesive are applied to the fiber material. Because perspiration lowers the impedance between the textile-based electrodes, perspiration can be estimated from the impedance change. However, both the volume and salinity of perspiration contribute to these impedance changes, making it challenging to distinguish between these effects. To address this challenge, we utilized the impedance characteristics of water and salinity. A bidirectional driver circuit for impedance estimation was proposed and implemented. The measurement results indicate that the proposed method can measure the volume and salinity of perspiration from the impedance changes in the electrode.
Date of Conference: 06-08 January 2024
Date Added to IEEE Xplore: 28 February 2024
ISBN Information:

ISSN Information:

Publisher: IEEE
Conference Location: Las Vegas, NV, USA

I. Introduction

In recent years, owing to population aging and global warming, the number of patients with heat stroke has increased. Heat stroke leads to death in the worst cases, particularly in the elderly population. Therefore, early detection and medical treatment have gained increasing attention in recent years [1, 2]. Heat stroke progresses unnoticed and often develops indoors [3]. For these reasons, the constant measurement of biological signals in daily life is effective for the prevention and early detection of heat stroke. One of the main causes of heat stroke is an imbalance between water volume and electrolyte concentration in the body. As shown in Fig. 1, during perspiration, electrolytes are normally reabsorbed by sweat glands, resulting in a low perspiration concentration. However, this mechanism does not function well during heavy sweating and perspiration when a high concentration of electrolytes is released [4]. Perspiration is highly viscous and difficult to evaporate, rendering it inefficient for body temperature regulation. In addition, a decrease in electrolyte concentration in the body leads to dehydration due to urination for osmotic pressure adjustment. To achieve early detection of heat stroke, it is important to separately measure the volume of perspiration and electrolyte concentration in perspiration.

References

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