Using Capacitance Sensor to Extract Characteristic Signals of Dozing from Skin Surface

Chen, Po Ying; Chen, Chi Chang; Yeh, Wen Kuan; Chang, Yukan; Huang, Der Chen; Yu, Shyr Shen; Tsai, Chwei Shyong; Huang, Yu Jung; Lin, Wei; Chu, Shao I.; Pan, Chung Long; Lin, Tsung Hung; Liu, Shyh Chang

doi:10.1155/2014/238350

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…Sensors. Low-cost fringing fields capacitive sensors using conventional metal grids or PCB fabrication techniques have been successfully presented for many applications, like soils [10], cereal grains [11], air [12,13], and human skin [14].…”

Section: Principle Of Operation Of Fringing Field Capacitivementioning

confidence: 99%

Fringing Field Capacitive Smart Sensor Based on PCB Technology for Measuring Water Content in Paper Pulp

Morais

Carvalhaes-Dias²,

Duarte

et al. 2020

Journal of Sensors

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We present a capacitive smart sensor based on printed circuit board (PCB) technology to measure the amount of water content in a paper pulp at the wet end of a paper machine. The developed sensor incorporates in the same PCB the signal processing circuits. It is a handheld portable device, and its output is sent to the reading equipment using a Bluetooth wireless connection, providing to the sensor’s operator ease of mobility around the wet end of a paper machine. The prototype was tested in a laboratory, using a wire mesh to emulate the end of a paper machine, and we were able to measure and easily detect when it reaches the water content in the range of 90% to 92%, as required in the paper fabrication process. Standard deviation of the capacitance measurements at various moisture levels is four orders of magnitude smaller than the mean. The smart sensor was tested in the 20°C to 40°C temperature range, in a paper pulp with a gravimetric water content of 91%. Since the variation of capacitance with temperature is practically linear, we propose a simple linear compensation equation to correct the observed sensitivity with the temperature. To keep the signal processing circuits small, low cost, simple, and robust, a novel direct interface sensor to microcontroller circuit technique was used to make the capacitive measurement, allowing for measuring small capacitance deviations without high-frequency oscillators. It was shown that it is possible to integrate the signal processing circuits in the top layer of the PCB interdigitated sensor without adding noise or degrading the performance of the capacitive sensor.

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Section: Principle Of Operation Of Fringing Field Capacitivementioning

confidence: 99%

Fringing Field Capacitive Smart Sensor Based on PCB Technology for Measuring Water Content in Paper Pulp

Morais

Carvalhaes-Dias²,

Duarte

et al. 2020

Journal of Sensors

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“…This study was set in a real work situation as the batik workers still work under the evaluation of the moisturizer's effectiveness, and clinical effects were determined by using Hand Eczema Severity Index (HECSI), transepidermal water loss (TEWL), and skin capacitance. 11,12 Materials and Methods…”

Section: Introductionmentioning

confidence: 99%

Cocos nucifera and glycerine afterwork moisturizers for secondary prevention of hand dermatitis among fabric worker: a randomized, double- blind, cross over trial

Budianti

Soebaryo

Mansyur

et al. 2023

Preprint

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Introduction: The use of skin barrier-enhancing topical medication is a favorable approach for the treatment of occupational hand dermatitis (OHD). Cocos nucifera or coconut oil is one of the best sources of lipid enriched with laurate acid, and glycerin is a well-known humectant that improves skin hydration. This study is aimed is to evaluate the effectiveness of Cocos nucifera and glycerin for secondary prevention of OHD among batik (Indonesian traditional fabric) workers. Methods: In a randomized, double-blind, crossover trial, the effect of glycerin-Cocos nucifera cream vs. glycerin-only was considered with multiple afterwork applications of moisturizer over a 2-week period on batik workers with OHD. Assessment of trans-epidermal water loss (TEWL), skin capacitance, and a clinical assessment using the Hand Eczema Severity Index (HECSI) were carried out at day 0 and 14. Results: Thirty-two batik dyeing and/or rinsing workers were enrolled in the study with mild to moderate OHD. Clinical improvement was demonstrated by 20% decrease in HECSI and TEWL, and 20% increase in skin capacitance. Both moisturizers were equally effective for the secondary prevention of OHD. Conclusion: Glycerin-Cocos nucifera and glycerin-only cream are equally effective for secondary prevention for OHD among batik worker to reduce the prevalence of hand dermatitis.

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“…(6,7) Capacitive sensors have been widely used in various fields because of their high sensitivity, fast dynamic response, and low cost. (8)(9)(10) A capacitive sensor does not need to be in physical contact with the object to be measured during the measurement process and is unaffected by light, vibration, and other external environmental factors. Therefore, researchers use the capacitance principle to design rainfall sensors.…”

Section: Introductionmentioning

confidence: 99%

Proximity Capacitance Array Sensor Based on Data Aggregation Strategy for Rainfall Detection

2018

Sensors and Materials

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People need to measure rainfall accurately in many cases, and hence improving the accuracy and real-time performance of rainfall sensors is a current problem. A new type of rainfall sensor based on a proximity capacitance array is proposed. The sensor can be used to detect the rainfall coverage of an insulator surface accurately and efficiently. According to the different characteristics of dielectric constants of different materials, the water film thickness on the surface of the insulator is measured by using the principle of proximity capacitance, and a comprehensive evaluation index of sensor performance is proposed. The finite element method is utilized to compare the characteristics of capacitive sensors using three types of electrode to improve sensor penetrability and achieve high water film detection sensitivity. An electrode array is designed according to optimal results, and multielectrode measurement data are aggregated to determine the amount of rainfall. Moreover, an experimental sensor platform is constructed to verify the proposed rain sensor based on a proximity capacitance array. The designed rainfall sensor possesses good accuracy, and the measurement error is about ±2.3%. The proposed rainfall sensor allows for accurate real-time measurements of rainfall on insulator surfaces with a certain thickness.

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Using Capacitance Sensor to Extract Characteristic Signals of Dozing from Skin Surface

Cited by 5 publications

References 18 publications

Fringing Field Capacitive Smart Sensor Based on PCB Technology for Measuring Water Content in Paper Pulp

Fringing Field Capacitive Smart Sensor Based on PCB Technology for Measuring Water Content in Paper Pulp

Cocos nucifera and glycerine afterwork moisturizers for secondary prevention of hand dermatitis among fabric worker: a randomized, double- blind, cross over trial

Proximity Capacitance Array Sensor Based on Data Aggregation Strategy for Rainfall Detection

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