| 摘要 |
PROBLEM TO BE SOLVED: To accurately measure light transmittance of a measured object such as a liquid. SOLUTION: The light transmittanceαof the measured object L is computed pursuant to Expression [α=Ln(I1/I2)/(X2-X1)], using a ratio of outputs I1/I2 and distances X1, X2 of light receiving elements, where L1 is an output from the light receiving element 3 when transmission light is detected by the light receiving element 3 after light from a light source 2 is transmitted through the measured object L in the first distance X1, and where L2 is an output from the photoreception element 4 when transmission light is detected by the photoreception element 4 after the light from the light source 2 is transmitted through the measured object L in the second distance X2 different from the first distance X1, and the light transmittanceαof the measured object L is thereby measured accurately even when an illuminance of the light source 2 is fluctuated, irrespective thereof. COPYRIGHT: (C)2006,JPO&NCIPI
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