| 释义 |
transˈmittance
[f. as prec. + -ance: cf. admittance.]
1. The action of transmitting; transmission. rare.
1855in H. Clarke Eng. Dict.; and in later Dicts.
2. Physics. The ratio of the transmitted luminous flux to the incident luminous flux.
1919Technologic Papers U.S. Bureau of Standards No. 119. 10 The transmittance T is defined as the fraction of radiant power transmitted by the first surface which is incident on the second surface. 1960[see reflectance]. 1980Nature 29 May 313/1 We had to use a shorter path⁓length (970 m at Riverside and 750 m at Claremont) because of the poor optical transmittance of the polluted atmosphere at our observation sites.
Hence transˈmittancy, the ratio of the transmittance of a solution to that of a similar body of solvent.
1925Jrnl. Optical Soc. Amer. X. 177 (table) Tsol/Tsov = transmittancy. 1936Plant Physiol. XI. 229 The transmittancies were obtained with a Bausch and Lomb visual spectrophotometer. 1959H. Barnes Apparatus & Methods Oceanogr. i. 26 A calibration can then be set up relating transmittancy and concentration from which the concentrations of unknowns may be read when their transmittancies have been determined. |