Calorimetric trace analysis by laser induced thermal lens method

Details Calorimetric trace analysis by laser induced thermal lens method Calorimetric trace analysis by laser induced thermal lens method

1980-01-28

1982-01-12

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250347, G01J 100

Patent

active

043107621

ABSTRACT:
A technique for detecting very small quantities of particular materials by absorption of visible, ultraviolet or infrared light from a laser source is disclosed. The technique takes advantage of the thermal lens effect, i.e., a thermally induced alteration of the index of refraction, which occurs whenever a laser beam is passed through an absorbing medium, especially fluids. A converging beam derived from a coherent, collimated beam, e.g., a laser beam in the infrared, visible, or ultraviolet light range, is passed through a reference cell. The converging beam is slightly modified by a change in the index of refraction due to the thermal lens effect occurring within the reference cell. The modified beam is passed through a sample cell containing the identical medium as that in said reference cell with an additional material therein sought to be identified. The reference cell and sample cell are located at points in the beam path such that any modification in the beam caused by a change in the index of refraction of the medium in the reference cell is cancelled by the same medium in the sample cell. Any detectable modification in the beam, e.g., expansion (or divergence), as it evolves from the sample cell is due to the thermal lens effect caused by the material sought to be identified.

REFERENCES:
patent: 3436964 (1969-04-01), Dolin et al.
patent: 4048499 (1977-09-01), Kreuzer
patent: 4061918 (1977-12-01), Preier et al.

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