Optical measuring device
An optical measuring device according to the present invention includes: a plane mirror ( 3 ), which has a central opening that functions as either a light entering window or a light source fitting hole ( 5 ) and an observation window 6 ′ that enables a photodetector ( 6 ) to take measurements; and an integrating hemisphere ( 2 ), which has its center of radius of curvature defined within the central opening of the plane mirror ( 3 ) and of which the inner wall surface functions as a light diffuse reflective surface ( 1 ). The plane mirror ( 3 ) and the integrating hemisphere ( 2 ) form an integrating space inside.
1. An optical measuring device comprising:
a plane mirror, which has a central opening that functions as either a light entering window or a light source fitting hole and an observation window that enables a photodetector to take measurements; and
a hemisphere, which has its center of radius of curvature defined within the central opening of the plane mirror and of which the inner wall surface functions as a light diffuse reflective surface,
wherein the plane mirror and the hemisphere form an integrating space inside.
2. The optical measuring device of claim 1 , wherein the photodetector is fitted into the observation window of the plane mirror.
3. The optical measuring device of claim 1 , wherein in a situation where a light source, fitted into the central opening, protrudes from the plane mirror into the integrating space to a height L h , if the distance from the center of the central opening to the center of the observation window is L, the observation window has a radius R 1 , and a photosensitive plane of the photodetector has a radius R 2 ,
the photodetector is L d below the observation window and satisfies L d >L h (R 1 +R 2 )/(L−R 1 ).
4. The optical measuring device of claim 1 , wherein no baffle is arranged in the integrating space.
5. The optical measuring device of claim 1 , wherein the photodetector is a luminometer.
6. The optical measuring device of claim 5 , wherein the distance from the observation window to the central opening is 65% or more of the radius of curvature of the hemisphere.