RAD Data comm FLM-1 Betriebsanweisung PDF herunterladen (Seite 125)

100

101

GS-800 Imaging Densitometer

7-11

Diffuse Versus Specular O.D.

In the step tablet form, you enter O.D. as diffuse density, and then the

software automatically calculates the specular density.

Specular density is a measure of the light that passes directly through a

medium. Diffuse density includes light that is scattered as it passes through

the medium. Step tablet values are given in diffuse density, but are measured

by the scanner in specular density, and therefore must be converted according

to the specular/diffuse O.D. ratio. This conversion does not affect

quantitation.

Fig. 7-10. Specular and diffuse density

Diffuse density values are converted to specular optical density units

according to the following formula:

7.5.b Calibration Settings

After you have entered the step tablet values, you can immediately calibrate

by clicking on the Calibrate Now button (in the Densitometer Options dialog

box).

You can also specify how often you want the GS-800 to automatically

recalibrate. Either click on the Calibrate Before Every Scan checkbox or enter a

Recalibration Interval (in minutes) in the appropriate ﬁeld.

Note: The scanner will automatically recalibrate each time you change your

ﬁlter or your reﬂective/transmissive setting. (If you select a different

Specular Light (passes directly through medium)

Diffuse Light (is scattered by medium)

Medium (gel, film, etc.)

Specular OD 1.4 Diffuse OD⋅=

1 2 ... 120 121 122 123 124 125 126 127 128 129 130 ... 400 401

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