Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-12-06
1992-03-03
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250216, 356445, G01N 2186
Patent
active
050935801
ABSTRACT:
An optical system, apparatus and method includes a visible energy source and a radiant energy source, means to direct visible or radiant energy at preselected but variable angles of incidence through an ATR crystal to a sample at a sample plane and means to collect encoded radiant energy reflected or emitted from the sample through the ATR crystal to a detector at preselected but variable angles of reflection or emission. The optical system, apparatus and method may further include a lens or other optical element selectively positioned in the optical path to change the focus of the optical path to initially survey the sample on a movable stage at a focal plane spaced from the sample plane. The survey mode permits easy identification of a surface area of interest on the sample to permit that area of interest to be moved into contact with a surface of the ATR crystal at the sample plane for subsequent accurate analysis thereof. The optical system, apparatus and method may have three modes of operation (namely a survey mode, a viewing mode or an analysis mode) passing visible or radiant energy to and from a sample or reference material through an ATR crystal.
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Nanosampling Internal Reflection Spectroscopy of Solids and Liquids by F. DeBlase, Spectroscopy, Jun. 1988, pp. 96-107.
Allen S.
Nelms David C.
Spectra-Tech Inc.
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