Relative spectral data collected using a mirror reference will be different than spectral data acquired using a BK-7 reference, or a Spectralon white plate reference Absolute reflectance data by comparison is comparable across spectrometers and laboratories. Even the “same” type of standard (i.e., a front surface aluminum mirror) can vary significantly from manufacturer, and typically will change response with age and use. Absolute reflectance can be obtained using the proper absolute reflectance accessory (i.e., such as the Universal Reflectance Accessory) or by mathematically correcting the relative data to absolute using a known, calibrated standard.Īn important consideration is that relative data typically cannot be compared across spectrometers because different standards are used in different laboratories. Absolute reflectance means that the acquired data is independent of the standard or optical components being used to background the accessory to set a 100% R baseline. Relative simply means that the data collected from the spectrometer is relative to the standard that was used to background the accessory. Reflectance measurements can either be relative or absolute.
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