optical density

British  

noun

1. physics the former name for reflection density transmission density

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Example Sentences

The researchers monitored growth through optical density and chlorophyll-a levels to measure how these chemical factors affected cyanobacterial productivity.

From Science Daily

The user of this tool, however, will encounter terms like “macular pigment optical density,” “vertical photopic illuminance” and “spectral power distribution,” indicators that it’s probably best left to professional lighting designers.

From New York Times

We include both optical density and direct cell counts to unambiguously demonstrate growth using two independent methods.

From Science Magazine

This defect in the eye-lens is somewhat counteracted by a variable optical density, increasing from the outer to the central portion.

From Project Gutenberg

Accordingly, when the optical density of the air changes as a result of its varying content of moisture, the colour-phenomenon undergoes an opposite change in each of the two cases.

From Project Gutenberg