#### What does Fluorometer mean? What is the working principle of Fluorometer? Information about Fluorometer.

FLUOROMETER, or fluorkneter, an instrument used in chemical analysis to measure the intensity of the fluorescence emitted by a substance. It is an extremely Sensitive instrument, detecting quantities of uranium and other fluorescent materials as minute as $\displaystyle {{10}^{-9}}$ gram.

The design of the instrument is based on the fact that a substance emits fluorescence after it absorbs radiant energy from an ultraviolet light source. The fluorometer consists of an ultraviolet light source, a filter that transmits ultraviolet light between the source and the sample to be analyzed, a filter that transmits the fluorescence emitted by the sample, a phototube that detects the intensity of the fluorescence, and a microammeter that measures the current from the phototube. When diffraction gratings or prisms are used instead of filters, the instrument is called a spectrofluorometer.

The ultraviolet light source commonly is a high- or low-pressure mercury vapor lamp or a xenon arc lamp. As shown, the fluorescence usually is measured at a right angle to the ultraviolet light path to avoid interference from the source.

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