Immersion probe for infrared internal reflectance spectroscopy

Details Immersion probe for infrared internal reflectance spectroscopy Immersion probe for infrared internal reflectance spectroscopy

1994-01-31

1995-10-17

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

25033912, 2503412, 2503418, G01N 2135, G01N 2184

Patent

active

054593166

ABSTRACT:
An immersion probe (for powder or liquid) is disclosed comprising an ATR element supported at the bottom of a radiation-confining tube. The ATR element has a sample-entering tip which is either conical (preferably) or roof-top shaped. The ATR element causes entering radiation to be reflected twice by its sample-engaging surfaces, where attenuation due to the sample material occurs. The ATR element also acts as a retroreflector, causing the exiting radiation to follow a path parallel to the entering radiation. In order to avoid spurious results due to reflection by the rear surface of the ATR element, its rear surface is cone shaped or rooftop shaped, using a large apex angle.

REFERENCES:
patent: 4812041 (1989-03-01), Doyle
patent: 4835389 (1989-05-01), Doyle
patent: 5051551 (1991-09-01), Doyle

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