13.4: Instrumentation
Filter Photometer The simplest instrument for molecular UV/Vis absorption is a filter photometer (Figure 13 4 1), which uses an absorption or interference filter to
The Role of Filter Spectrometers
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The grating or prism splits the light into its constituent wavelength components, and the detector records the light intensity as a function of wavelength. If the spectrometer has a large spectral range, it may also have filters to stop higher order light from reaching the. The entrance slit allows light into the spectrometer, where a system of mirrors or lenses routes it first onto a diffraction grating or prism, and then onto the detector. If you are building a spectral sensor for fluorescence spectroscopy, you are likely considering whether you should use either filter-based photometers or diode array spectrometers. Currently, every series of Sarspec's spectrometers offer every user the possibility of adding filters at the entrance of the spectrometer, after the slit. The slit works simultaneously as a filter holder, but while the slit is permanently attached to the holder, it is possible to use multiple.
