| 单词 |
spectra pritchard photometer |
| 释义 |
Spectra Pritchard photometer Spectra Pritchard photometer[′spek·trə ′prich·ərd fə′täm·əd·ər] (optics) A photoelectric instrument for measuring the luminance of surfaces; it has a telescopic viewing system for imaging the bright surface to be measured on the cathode of a photoemissive tube, and a separate unit that combines the power supply with the controls and readout meter. |
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