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Abstract

Calibration wavelengths are injected into an optical detection system preferably at a point after laser rejection filtration, enabling the known spectral content of the calibration radiation to pass through and into a spectrograph. In a preferred embodiment, at least some of the wavelengths used for calibration are derived through the excitation of a noble gas such as neon, thereby conveniently and economically providing a full-spectrum calibration line set. The feed from the laser source used to illuminate the sample is also preferably introduced into the collection path, enabling both the calibration wavelengths and laser line to be detected and used in calibration. The invention is applicable to spectral analysis systems in general, including non-Raman systems and systems which do not require a laser notch pre-filter stage.

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First Claim