Abstract
Photochromism is a chemical process in which a compound undergoes a reversible change between two states having separate absorption spectra, i.e. different color [1]. In our previous work we have published some solutions of problems of measuring photochromic textile sample by standard commercial spectrophotometric systems [2]. Main problem with measurement of kinetic behavior of photochromic pigments by standard spectrophotometer is relatively long time period between individual measurements (5 s) and impossibility of measuring whole color change during exposure without interruption of illumination of sample during measurement. It means, standard commercial spectrophotometers enable off-line measurement of kinetic behavior during exposure period and quasi on-line measurement during reversion period. Based on this problem, it is only possible to obtain precise data during reversion—decay process and growth process (exposure) is affected by high variability of data. Following this knowledge, we developed original experimenttal system with short time scanning of color change of photochromic samples during growth and decay period of color change. In this study it is presented new view on the relationship between intensity of UV-A radiation and color change half-life t1/2. Via this relation, it is demonstrated the possibility of the flexible textile-based sensors construction in the area of the radiation intensity identification.
Highlights
It is well known, that ozone depletion in the earth’s atmosphere has made the headlines on many occasions and most people would be aware of the significant problem that exists
In our study we showed new aspects of the relationship between UV radiation intensity, color change half-life of exposition and half-life of relaxation, reversion respecttively
We demonstrate differences between photochromic pigments behavior concerning to spectral sensitivity
Summary
That ozone depletion in the earth’s atmosphere has made the headlines on many occasions and most people would be aware of the significant problem that exists. Skin cancer, premature aging, and suppression of the immune system are some of the harmful effects of acute and cumulative exposure to ultraviolet radiation (UVR). A decrease of 1% in ozone would lead to increases in the solar UVR at the earth’s surface and may eventually lead to a 2.3% increase in skin cancer. Most of the health problems due to UV-rays are not visible on a short issue, and so, there is a feeling that there is no risk, except sunburns by staying for a long time in the sun [3,4,5]. An easy to understand and use UV-sensor would help people know what exact protection they need according to the amount of UV they are exposed to
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