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Measurement of Instrumental Stray Light

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Measurement of Instrumental Stray Light

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The consequence of undesired energy reaching the detector in a spectrometer is a reduction in photometric accuracy, since some light reaches the detector that cannot be attributed to the transmission (or absorption) of the sample at the analytical wavelength. Instrumental stray light, like scattered light, is generally measured either with cut-off filters or monochromatic light. Instrumental stray light is commonly measured by using a set of high-pass cut-off optical filters (whose transmission curves look like that in Figure 11-10). The spectrometer is then scanned toward shorter wavelengths and the transmittance measured; once the transmittance level has reached a steady minimum (a plateau), this reading is taken to be the stray light.

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