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9997956
Test of Moisture Sensor Activation Speed
Abstract:

Nocturnal enuresis or bed-wetting is intermittent incontinence during sleep of children after age 5 that may precipitate wide range of behavioral and developmental problems. One of the non-pharmacological treatment methods is the use of a bed-wetting alarm system. In order to improve comfort conditions of nocturnal enuresis alarm system, modular moisture sensor should be replaced by a textile sensor. In this study behavior and moisture detection speed of woven and sewn sensors were compared by analyzing change in electrical resistance after solution (salt water) was dripped on sensor samples. Material of samples has different structure and yarn location, which affects solution detection rate. Sensor system circuit was designed and two sensor tests were performed: system activation test and false alarm test to determine the sensitivity of the system and activation threshold. Sewn sensor had better result in system’s activation test – faster reaction, but woven sensor had better result in system’s false alarm test – it was less sensitive to perspiration simulation. After experiments it was found that the optimum switching threshold is 3V in case of 5V input voltage, which provides protection against false alarms, for example – during intensive sweating.

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References:

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[2] M.A. Mestrovic, "Characterisation and Biomedical application of Fabric Sensors”. Australia: RMIT University, 2007. pp 184
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[4] J. Ponmozhi, C. Frias, T. Marques et.al., "Smart sensors/actuators for biomedical applications: Review” inMeasurement. Vol.45, Iss.7, 2012, pp 1675-1688.
[5] C.R. Merritt, "Electronic Textile-Based Sensors and Systems for Long-Term Health Monitoring/ PhD thesis”. North Carolina: ProQuest, 2008, pp 175.
[6] T. Neveus, P. Eggert, J. Evans, A. Macedo et.al., „Evaluation of and Treatment for Monosymptomatic Enuresis: A Standardization Document From the International Children’s Continence Society” in The Journal of Urology, Vol. 183, Issue 2, 2010, pp 441–447.
[7] I. Parkova, A. Vališevskis, A. Užāns, A. Viļumsone, „Analysis and Improvement of Nocturnal Enuresis Alarm System” in Industria Textila Magazine, Vol 6, 2013, pp 355-361.
[8] I. Baltiņa, N. Ozoliņa, "Gultasveļasaudumukvalitāte” in Scientific Journal of RTU. Materiālzinātne. 9. series. 1. vol., 2006, 62-66 lpp.
[9] Q. A. Acton (ed.). Issues in Genitourinary Medicine: 2011. Scholarly Editions, Atlanta, Georgia, 2012.
[10] B. P. Saville, Physical Testing of Textiles. Manchester, England: Woodhead Publishing, 1999. –pp 310.
[11] I. Parkova, "Woven Textile Moisture Sensor for Enuresis Alarm Treatment" in Key Engineering Materials, 2014, vol.604, pp 146-149.
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