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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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