Ozgur ATALAY, Asli ATALAY, Muhammad Dawood HUSAIN

MEKANİK TEST KOŞULLARININ TEKSTİL BAZLI UZAMA SENSÖRLERİNİN ALGILAMA ÖZELLİKLERİNE ETKİSİNİN İNCELENMESİ ÜZERİNE BİR ARAŞTIRMA

Bu çalışma farklı mekanik test koşullarının örme yapılı uzama sensörlerinin algılama özelliklerine etkisini incelemektedir. Bu amaç doğrultusunda öncelikle yarı statik test koşullarının sensörlerin algılama özelliklerine etkisi tartışılmıştır. Daha sonra ise çekme makinesinin üzerindeki hareketli çenenin kumaşa uyguladığı farklı çekme hızlarının sensör karakteristiklerine etkisi incelenmiştir. Örme yapılı sensörler 2 ohm/cm elektrik direniıne sahip gümüş kaplı naylon iplikleri ve farklı kalınlığa sahip elastomerik iplikler kullanılarak düz örme makinesinde üretilmiştir. Yarı statik test sonuçlarına göre; göreceli olarak daha az uzama kapasitesine sahip elastomerik ipliklerle üretilen sensörler daha az elektriksel ölçüm hatası vermiştir. Ayrıca, farklı çekme hızlarının sensörlerin histeresiz ve doğrusallık değerlerine etkisi gözlemlenirken, hassasiyet değerlerine etkisi gözlemlenmemiştir. Bu çalışmada incelenen sensörler insan fizyolojik özelliklerinin ölçülmesinde kullanılabilir.

Anahtar Kelimeler:

Örme sensörler, gümüş kaplı iplik, uzama sensörleri, mekanik test, elastomerik iplik

INVESTIGATION OF THE MECHANICAL TESTING CONDITIONS ON SENSING PROPERTIES OF TEXTILE-BASED STRAIN SENSOR

The aim of this research study is to investigate the effect of different mechanical test conditions on the sensing properties of proposed knitted strain sensors. In order to fulfill this aim, initially, the effect of quasi-static testing on the sensing properties of sensors is discussed. Thereafter, effect of the tensile testing machine cross head speed on sensor characteristics is investigated. A single design of proposed knitted strain-sensing fabric was devised using computerised flat-bed knitting technology, comprising silver coated nylon conductive yarn with 2 Ω/cm linear resistance and insulating core-spun Lycra yarns with different yarn fineness. It was observed that that sensors produced with the yarn low extension capability showed less imprecision during quasi-static tests and alteration on machine crosshead speed also affected some sensor properties such as hysteresis and linearity but no affect found on gauge factor values. Proposed knitted strain sensing structures can be used for measuring the physiological parameters of the human body, i.e., respiration rate or body articulation.

Keywords:

Knitted sensor; strain sensor; knitting; test conditions; silver yarn,

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