Luminous flux measuring apparatus which calculates spectral effi

Details Luminous flux measuring apparatus which calculates spectral effi Luminous flux measuring apparatus which calculates spectral effi

1993-05-14

1994-10-25

Rosenberger, Richard A.

Optics: measuring and testing

Photometers

Integrating spheres

250228, G01J 142

Patent

active

053594061

ABSTRACT:
A luminous flux measuring apparatus for measuring a spectral radiant flux or a total flux of a lamp includes an integrating sphere having a light sensing window defined therein, a spectrometer for measuring light transmitted through the light sensing window, a spectral radiant flux operation unit, and a total flux operation unit. When a standard lamp is lightened inside the integrating sphere, the output I.sub.std0 (.lambda.) of the spectrometer is measured. Thereafter, the I.sub.std1 (.lambda.) of the spectrometer is measured with a light absorption sheet placed inside the integrating sphere. Likewise, the outputs I.sub.m0 (.lambda.) and I.sub.m1 (.lambda.) of the spectrometer are measured with the light absorption sheet placed inside the integrating sphere and with no light-absorption means placed inside the integrating sphere, respectively. Upon input of I.sub.std0 (.lambda.), I.sub.std1 (.lambda.), I.sub.m0 (.lambda.), and I.sub.m1 (.lambda.) into the spectral radiant flux operation unit, this unit calculates the spectral efficiency Q.sub.std (.lambda.) of the integrating sphere with the standard lamp and the spectral efficiency Q.sub.m (.lambda.) of the integrating sphere with the lamp to be measured. Using Q.sub.std (.lambda. ), Q.sub.m (.lambda.), I.sub.std0 (.lambda.), I.sub.m0 (.lambda.), and a known spectral radiant flux value P.sub.std (.lambda.) of the standard lamp, the spectral radiant flux operation unit calculates the spectral radiant flux P.sub.m (.lambda.) of the lamp to be measured. The total flux operation unit calculates the total flux value F.sub.m of the lamp using the spectral radiant flux P.sub.m (.lambda.).

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