Cavity-enhanced liquid absorption spectroscopy
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United States of America Patent
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Jan 4, 2005
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app pub date -
Jul 3, 2002
filing date -
Jul 3, 2002
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Abstract
An integrated-cavity output spectroscopy (ICOS) instrument adapted for measuring liquid samples has a low-scatter flow cell arrangement passing through a stable optical cavity defined by an arrangement of two or more mirrors. The flow cell provides a sample volume within the cavity of at most one microliter at any given time. The optical cavity has an effective cavity length of at most one centimeter and mirror radii of curvature for the stable cavity arrangement are much longer than the cavity length. A light beam with stable characteristics is introduced into the cavity, passes through the liquid sample cell multiple times, and a detector measures a portion of the light from the cavity. The light measurement is analyzed to determine absorption by the liquid sample, and related information.
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