Tech Note 478 Detail

Sodium Doublet Measurement

Affected Products:

OS-9255 Precision Interferometer

How do I measure the sodium doublet with DataStudio?

PASCO Solution:

The yellow fringes pass alternately from a condition of high contrast to one of almost complete disappearance. This latter condition occurs when one set of fringes is halfway between the other set. Move the mirror until the fringes almost most nearly disappear (maximum extinction coefficient). Record the micrometer reading D1. Turn the micrometer head to through ten more maximum extinctions. Record the micrometer reading, D2. Calculate the average distance d between conditions of disappearance: d = (D2-D1)/10.

The difference in wavelengths between the two extinction can be calculated by the formula: Δλ = λ2/2/d.

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Sodium Doublet Measurement Theory

Creation Date: 03/25/2004
Last Modified: 03/26/2004
Mod Summary: