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product arrow ulasan senter UV (ultraviolet)

ULASAN SENTER UV

ADA 2 jenis senter UV yang umum dijumpai :

1. Ultraviolet 395 nm

2. Ultraviolet 365 nm

Application
LED Wavelength
Flourescent Notes
Leak Detection
395mn or
365nm or
465nm
  • 455nm, for A/C leak detection, need amber glass to enhance fluorescence
  • 395nm, works on universal AC dye, Dye-Lite All-in-One dye and Dye-Lite water base dye for coolant.Do not need amber glass to enhance florescence
  • 365nm, no visible light, works especially on difficult-to-fluoresce yellow dyes, detects Dirty Diesel Engine Oil Leaks
Scorpion Hunting
395mn
or 365nm
  • Scorpions fluoresce better under 395nm
  • Scorpions may see 395nm light and run
  • Scorpions don’t seem to see 365nm light
Oil Painting Inspection
395nm
  • Dark purple indicates repairs or over-paint
  • Old resin varnish appears as green film
  • Older restoration is lighter
  • Bluish-white spots indicate lining compound
  • Very small blue dots are dust
  • Masking varnish to hide restoration will fluoresce, but it is noticeable
Pigment Identification
395nm
  • Pigments fluoresce different colors
  • Zinc oxide pigments, 1850, bright canary yellow
  • Leaded zinc oxide, 1855-96, yellowish white
  • Lithopone, 1901, white
  • Titanium dioxide, 1920, rose to rose-violet
Fossils
395nm
  • Teeth and egg shells fluoresce bright orange or yellow, stronger than bones
  • Middle Eocene through Pliocene mammals exhibit UV light fluorescence
  • Few Paleozoic or Mesozoic vertebrates were found to fluoresce
  • Pleistocene mammals did not exhibit fluorescence
  • Gar fish scales often fluoresce
Rodent/Pest Control
395nm
  • Dry rodent urine glows a blue-white if fresh.
  • Dry rodent urine glows a yellow-white if old.
  • Rodent hair glows blue-white and is easily identified on sacks or intermixed with food grains.
Lice Control
395nm,
365nm
  • Adult lice fluoresce yellow-green.
  • Nits glow opalescent white.
Early Stage Ringworm Detection
395nm
  • fungi causing this ringworm disease exhibit fluorescence.
  • Yellow to greenish-yellow at the base of the hair indicates presence of fungal spores.
Transgenic Plant Monitoring using GFP
395nm
  • Introducing the green fluorescent protein (GFP) into a plant
  • GFP fluoresces green under UV 395nm
  • Many wild plants fluorescence reddish purple
Paper Art
395nm,
365nm
  • Old paper fluoresces faintly whitish, yellowish or grayish
  • Modern paper glows bright bluish white
  • Smudged areas indicate erasures
  • New touch-up on watercolors and gouache has the same indications as on oil paintings.
  • 365nm shows blue, green color marks better on paper document
Textiles
395nm
  • Dye of new thread will fluoresce white
Polyester Indentification
395nm
  • Polyester and rayon will fluoresce under UV light.
  • Since Polyester will not absorb cotton dye, it is important to identify polyester before production to insure fabric consistency.
Marble
395nm
  • Surfaces of ancient marble fluoresce yellow-green
  • Freshly cut marble surface emits bright violet fluorescence
Minerals
395nm
  • Calcite fluoresces dull orange
  • Some only fluoresce under short-wave UV
Amber Inspection
395nm
  • Real amber fluoresces, Copal (young amber) will not
  • Darker ambers hardly fluoresce, but flecks of lighter color in it will
  • Common fluorescent colors are yellow, blue, green and orange
Glass Inspection
395nm
  • Certain glass fluoresces under UV
Porcelain
395nm
  • Cracks fluoresce brightly
  • Repair adhesives are visible under UV light
Arson Investigation (using UV 365nm LED Light)
Accelerant residues will fluoresce when exposed to 365nm UV light, even after the odors of accelerants are gone. The fluorescence is affected by heat exposure. The longer an accelerant is exposed to heat, the more differentiated its fluorescence color will be from other less exposed areas. This can assists in locating the point of origin of the fire.

Volatile hydrocarbons such as gasoline, kerosene fluoresce when exposed to UV short wavelength (less than 300nm).

Water Testing of Escherichia Coli (using UV 365nm LED Light)
A lot of airborne pollutants fluoresce in the 250-400nm wavelength range. The poisoning associated Escherichia coli (E. Coli) will also fluoresce in this range.

The test to identify E. coli is performed in test tubes filled with indicator nutrient dissolved in sample water. The solution is colorless. Tubes are then placed in 35oC incubator for 24 hours. If the solution turns yellow, coli forms exist in the water sample. If those tubes fluorescence under a UV 365 LED light, E. coli exists in water sample.

Milkstone Testing (using UV 365nm LED Light)
Some proteins found in milk and yogurts fluoresce when illuminated with UV 365nm light. Fresh deposits fluoresce yellow-white. If chemicals used to clean the deposits are not effective and left milkstone behind, it will fluoresce blue-white. The most common places for milkstone buildup are roughened areas, such as agitator blades, welded seams, corners of valves, and valve junctions.

Other notes:
1. To distinguish between milkstone fluorescence and reflection from stainless steel, you can move the light back and forth from the suspected fluorescent surface. Brightness will change if it is reflection;
2. Grease used on various valves and connections also fluoresces, but can be wiped off.

Aflatoxin Testing ( using UV 365nm LED Light)
Aflatoxin can be detected by using UV 365nm LED light. Aflatoxin is metabolites produced by the mold Aspergillus flavus on various grains and nuts. Aspergillus flavus can occur on all grains, fruits and vegetables if they are stored in damp places at temperatures that permit the growth of the mold and subsequent aflatoxin formation. Insect damage was found to be related to the presence of aflatoxin in pre-harvest corn.

AFLATOXIN are separable into Aflatoxins B1, B2, G1, M1, B2a and 4G2a. They all have absorption maxima around 360nm. The B toxins fluoresce at 425nm and the G toxins fluoresce at 450nm. The B1 toxin is the most common, followed by B2 toxin. The G toxins are fairly rare. The fluorescence sensitivity of the G toxins is more than 10 times greater than that for the B toxins.

Other notes:
1. Many other fungi and other species which do not produce aflatoxin may fluoresce.
2. Brightly fluorescing samples may contain less aflatoxin than weakly fluorescing samples,
3. Test samples need to be fresh because the fluorescence will eventually disappear, although the toxin itself remains.

Thin-layer Chromatography (TLC) using UV 365nm LED Light
365nm UV LED Light can be used with Cellulose coated TLC plate to compare the composition and concentrations of known and unknown samples.

TLC is done on a TLC plate consisting of a solid support (glass, plastic or aluminum) coated with a thin layer of absorbent material such as cellulose. Known and unknown samples are deposited and migrated with solvent along the cellulose. After solvent is dried, the dissolved compounds will be left on the cellulose. The TLC plate is then sprayed with developer and observed under UV-365 light, unknown compounds are considered to be identical to known standard if they migrate similar distances and exhibit the same degree of fluorescence (meaning similar concentrations.)

Reflected UV Photography
A UV 365nm LED light source is directed at the subject, which will then reflect this radiation back into the camera. The subject may be excited to emit fluorescence in the visible spectrum. The UV transmission filter over the lens will prevent any visible radiation from impinging on the film.

UV induced fluorescence photography
A UV 365nm LED light is aimed at the subject in a completely darkened room (daylight may wash the fluorescent). The subject reflects the UV and may also emit a visible fluorescence. The UV reflection is prevented from entering the lens by an UV absorbing filter. The film records any visible fluorescence



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