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Images of corona discharges as a source of information about the influence of textiles on humans

Ciesielska I. L.

Autex Research Journal

2009

Vol. 9, no. 1

36--41

The aim of the experiment was to bring closer the possibilities of using corona discharge photography (CDP), with special emphasis on the impact of textiles on corona discharge photography of human fingertips in contact with those textiles. The article describes an investigation concerning a short period of contact with textiles and their influence on human parameters such as blood pressure (BP) and heart beat (HB) as well as images of corona discharges (ICD). The authors were searching for a new method of demonstrating the influence of textiles on human subjects. As the research involved contact of textiles with human skin, certain static and friction issues were raised. Textile materials were chosen for the experiments on the basis of their tribological features. The ICDs used here were created as a result of placing body parts, e.g. fingers, in the area of a strong electrical field of high voltage (10 KV) and high frequency (1024 Hz). A digital camera placed within the area of discharge recorded this phenomenon. The temperature, air humidity, and air pressure in the examination room as well as gender, age, HR, BP and in the case of female volunteers, their menstrual cycles, exerted an effect on ICD in the study group. ICD of human beings seems to be a kind of marker of tribological features of textile materials.

Analiza wpływu tekstyliów na wyładowania koronowe

Ciesielska I. L.

Zeszyty Naukowe. Włókiennictwo / Politechnika Łódzka

2008

z. 64

41-57

Praca dotyczy badania wpływu tekstyliów na obrazy wyładowań koronowych powstałe wokół opuszków palców rąk ochotników. Prezentowane badania mają na celu stwierdzenie czy fotografia wyładowań koronowych (FWK) jest wiarygodnym i rzetelnym źródłem informacji o stanie człowieka, który wchodzi w kontakt z tekstyliami. Stwierdzenie "stan człowieka" dotyczy zarówno jego emocji, jak również wybranych parametrów fizjologicznych. Choć motywem przewodnim pracy pozostaje FWK opuszków palców człowieka, to na uwagę zasługuje też fakt podjęcia działań zmierzających do odpowiedzi na pośrednio postawione pytanie o odczuwanie tekstyliów i ich, krótko - i długotrwałe, oddziaływanie na człowieka.

A corona discharge is an electrical discharge observed in gases which occurs on the surface of charged conductors. In the induced electrical field, charge carriers (free electrons and positive or negative ions) present in the air surrounding the surface of optic plate and the object collide with other charge carriers interacting with one another. An electrical impulse transmitted to the plate after placing an object on it stimulates the response of the object by the movement of charge carriers. Free electron re-association is followed by a visible glow. This phenomenon is recorded around the fingertip. The preliminary experiments present researches on the influence of cardiovascular disease of human on CDP of their fingertips. One of the symptoms that accompanies patients suffering from cardiovascular diseases is an excessive perspiration. The factors affecting the CDP are potassium concentration, urea and sodium concentration in patient`s blood. Those substances are removed from the organism also with sweat. Their excess or deficit has a significant impact on a character of corona discharge around fingertip of human. Analogous assumptions were accepted to design a first part of the experiment. Its main goal was finding out whether CDPs taken from fingertips of volunteers change while human beings stay in a short period of contact with textiles, other than those they wore in the moment of investigation. There are statistically significant differences between parameters of CDPs taken from fingertips while volunteers stayed in the contact with textiles made of different raw materials such as coarse wool, acrylic, viscose and they did not have contact with other textiles they wore. The second part is a continuation of the trend presented above. In that case an attempt was made to determine the long period influence of 2 sets of garments on changeability of CDP. The statistically significancant differences between textile sets were not detected in CDP of the volunteers. It is closely connected with adaptation of human organism to garments. The main aim of the third part is to find out whether the textiles, which were worn by the volunteers, have any influence on human organism subject to the physical effort. It was discovered that there are statistically significant differences between the values of respiratory coefficient registered during effort in volunteer wearing garments made of coarse wool and acrylic.