Light intensity detector and detection method
First Claim
Patent Images
1. A light intensity detector comprising:
- an object detection member having optical characteristics that are changed depending on a concentration of an object;
a first light source that emits measuring light used to measure the concentration of the object;
a first light detection unit that detects light intensity of the measuring light, which has been changed due to a change in the optical characteristics of the object detection member;
a second light source that emits reference light used to correct the light intensity of the measuring light, which has been detected by the first light detection unit; and
a second light detection unit that detects light intensity of the reference light,wherein the light intensity of the reference light emitted from the second light source is detected by the second light detection unit without being affected by the change in the optical characteristics of the object detection member, andthe first light source and the second light source are arranged under same environment.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention intends to accurately measure a concentration of an object. An optical sensor (1) includes a detection light source (10) that emits measuring light, a light detection unit (40) that detects light intensity of the measuring light, which has been changed due to a change in optical characteristics of an object detection member (20), and a reference light source (11) that emits reference light. Light intensity of the reference light is detected by the light detection unit (40) without being affected by the change in the optical characteristics of the object detection member. The two light sources are arranged under the same environment.
-
Citations
8 Claims
-
1. A light intensity detector comprising:
-
an object detection member having optical characteristics that are changed depending on a concentration of an object; a first light source that emits measuring light used to measure the concentration of the object; a first light detection unit that detects light intensity of the measuring light, which has been changed due to a change in the optical characteristics of the object detection member; a second light source that emits reference light used to correct the light intensity of the measuring light, which has been detected by the first light detection unit; and a second light detection unit that detects light intensity of the reference light, wherein the light intensity of the reference light emitted from the second light source is detected by the second light detection unit without being affected by the change in the optical characteristics of the object detection member, and the first light source and the second light source are arranged under same environment. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A detection method comprising:
-
a measuring light emitting step of emitting, from a first light source, measuring light used to measure the concentration of the object; a measuring light detecting step of detecting, by a first light detection unit, light intensity of the measuring light that has been applied to an object detection member having optical characteristics changeable depending on a concentration of an object, the light intensity of the measuring light being changed due to a change in the optical characteristics of the object detection member; a reference light emitting step of emitting, from a second light source arranged under same environment as that of the first light source, reference light used to correct the light intensity of the measuring light, which has been detected by the first light detection unit; and a reference light detecting step of detecting, by a second light detection unit, light intensity of the reference light without being affected by the change in the optical characteristics of the object detection member.
-
Specification