单词 | wedge photometer |
释义 | wedge photometer [`wej fǝ`täm·ǝd·ǝr] ENGINEERING A photometer in which the luminous flux density of light from two sources is made equal by pushing into the beam from the brighter source a wedge of absorbing material; the wedge has a scale indicating how much it reduces the flux density, so that the luminous intensities of the sources may be compared. |
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