| 单词 | optical density |
| 释义 | > as lemmasoptical density optical density n. †(a) the degree to which a refractive medium slows down light passing through it (obsolete); (b) Physics the logarithm to the base 10 of opacity. ΘΚΠ the world > matter > physics > electromagnetic radiation > light > refraction > [noun] > refractive power > optical density optical density1864 absorbance1900 absorbancy1927 1864 D. A. Wells Nat. Philos. 317 If we rub a ground glass surface with wax, or any other substance of nearly the same optical density, we fill up the irregularities and restore its transparency. 1891 Jrnl. Soc. Chem. Industry 31 Jan. 20/1 From the colour of the negatives..the photographic and optical densities were very nearly alike. 1953 J. W. T. Walsh Photometry (ed. 2) v. 161 The reciprocal of the transmission factor of a plate is sometimes termed the opacity of the plate and the logarithm to base 10 of the opacity is often known as the optical density of the plate. 1990 T. G. Wreghitt & P. Morgan-Capner ELISA in Clin. Microbiol. Lab. viii. 115 A reduction in optical density of 50% or more compared to the test wells is considered to be a positive blocking reaction. < as lemmas |
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