| 摘要 |
Densitometer for quantitative determination of the contents of a sample spot on a TLC plate or the like, wherein the spot is scanned in a zigzag way by a light beam having a minute cross section. The peaks of the signal measured in the individual strokes of the zigzag scanning across the spot are connected to obtain an envelope signal, which is differentiated. By change of the polarity of the differentiated signal the valley point between two successive peaks in the envelope is detected so that integration of the measured signal caused by each of the components in the sample spot is conducted separately from integration of the measured signal caused by the other components.
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