Patent ID: 11867636
Assignee: YOKOGAWA ELECTRIC CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 11:
12. A measurement method to measure a physical quantity of a measurement target with a sheet-like shape, the measurement method comprising:
emitting light into a first integrating sphere;
detecting an intensity of light inside a second integrating sphere; and
calculating the physical quantity of the measurement target based on the intensity of the light detected in the detecting,
wherein the first integrating sphere is separated by a gap from a first surface of the measurement target, has a first opening facing the first surface and a first shielding plate that shields a part of the light emitted into the first integrating sphere, and is not provided with a light detector which detects the intensity of the light,
wherein the second integrating sphere is separated by a gap from a second surface of the measurement target positioned opposite to the first surface, and has a second opening facing the first opening with the measurement target sandwiched therebetween and a second shielding plate that reflects at least a part of the light inside the second integrating sphere to transfer the at least part of the light into the second integrating sphere, and
wherein a length of the second shielding plate is identical to or smaller than a length of the first shielding plate in a longitudinal direction and a width direction of the measurement target.