Europium fluorescence, also known as "fluorescence", re […]
Europium fluorescence, also known as "fluorescence", refers to a kind of photoluminescence cold luminescence. When a certain room temperature substance is irradiated with incident light of a certain wavelength (usually ultraviolet or X-rays), it absorbs light energy and enters an excited state, and immediately de-excites and emits outgoing light (often at Visible light band); and once the incident light stops, the luminous phenomenon disappears immediately. The emitted light with this property is called fluorescence. In daily life, people generally refer to all kinds of faint light as fluorescence, without carefully investigating and distinguishing their light-emitting principles. Fluorescence has a wide range of applications in the fields of biochemistry and medicine. People can stick fluorescent chemical groups to biological macromolecules through chemical reactions, and then detect these biological macromolecules sensitively by observing the fluorescence emitted by the tracer groups.
Let's see how to distinguish non-woven fabrics by fluorescence method:
Using ultraviolet fluorescent light to irradiate the non-woven fabrics. According to the different luminous properties of various non-woven fabrics, the characteristics of the non-woven fabrics' fluorescent colors are also different to identify the non-woven fabrics. The specific fluorescent colors of various non-woven fabrics show:
(1), cotton, wool fiber: light yellow
(2) Mercerized cotton fiber: light red
(3), jute (raw) fiber: purple brown
(4), jute, silk, nylon fiber: light blue
(5), viscose fiber: white purple shade
(6), light viscose fiber: light yellow purple shade
(7), polyester fiber: white light, blue sky, very bright
(8) Vinylon fiber: light yellow purple shade.