Patent ID: 7369243
Filing Date: 2008-05-06
Classification: G01N

Abstract:
1. An optical measuring apparatus comprising: an illuminating section that illuminates a first object with a first light; a light changing section that changes an intensity of the first light illuminating the first object; a light receiving device that receives a second light transmitted through or reflected from the first object; a control device for causing the light changing section to change the intensity of the first light when an amount of the second light transmitted through or reflected from the first object is not within a dynamic range of the light receiving section; and an output section that outputs, as a measurement result, an optical density of the first object according to i) a state of the light changing section, and ii) the amount of the second light received by the light receiving device, wherein the illuminating section also illuminates a calibration object having a known optical density, with the first light at the same time when the first object is illuminated with the first light; the light receiving device also receives third light transmitted through or reflected from the calibration object; and the output section calculates the optical density of the first object, on the basis of an amount of the third light from the calibration object.