FIELD: investigating or analyzing materials.
SUBSTANCE: method comprises applying the oil sample on glass, allowing it to stand for a specified time interval inside a thermal chamber, and setting the glass with oil on the working surface of the planar light guide. The light guide is irradiated with light within 250-500 nm bandwidth at an angle of 77±1° thus allowing light beam to be reflected from the working surface inside the light guide at least three times.
EFFECT: enhanced sensitivity.
1 dwg
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