Measuring apparatus and measuring method
First Claim
1. A measuring apparatus comprising:
- a filter that transmits light of a predetermined wavelength;
a first light receiving unit which receives a first light that is output from a first light source, reflected by or transmitted through an object to be measured, and transmitted through the filter and a second light that is output from a second light source, reflected by or transmitted through the object to be measured, and transmitted through the filter, and through which a first signal in response to the received first and second lights travels;
a second light receiving unit which receives light of a different path from the light received by the first light receiving unit, and through which a second signal in response to the received light travels;
a difference extracting unit that obtains a difference signal between the first signal traveling through the first light receiving unit and the second signal traveling through the second light receiving unit; and
an information generating unit that generates information of the object to be measured based on the signal obtained from the difference extracting unit.
2 Assignments
0 Petitions
Accused Products
Abstract
A measuring apparatus includes a filter that transmits light of a predetermined wavelength; a first light receiving unit receives at least one of a first light that is output from a first light source, reflected by or transmitted through an object to be measured, and transmitted through the filter and a second light that is output from a second light source, reflected by or transmitted through the object to be measured, and transmitted through the filter, and through which a signal according to the received light travels; a second light receiving unit receives light of a different path from that received by the first light receiving unit; a difference extracting unit that obtains a difference signal between the signals traveling through the first and second light receiving units and an information generating unit that generates information of the object to be measured based on the difference signal.
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Citations
18 Claims
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1. A measuring apparatus comprising:
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a filter that transmits light of a predetermined wavelength; a first light receiving unit which receives a first light that is output from a first light source, reflected by or transmitted through an object to be measured, and transmitted through the filter and a second light that is output from a second light source, reflected by or transmitted through the object to be measured, and transmitted through the filter, and through which a first signal in response to the received first and second lights travels; a second light receiving unit which receives light of a different path from the light received by the first light receiving unit, and through which a second signal in response to the received light travels; a difference extracting unit that obtains a difference signal between the first signal traveling through the first light receiving unit and the second signal traveling through the second light receiving unit; and an information generating unit that generates information of the object to be measured based on the signal obtained from the difference extracting unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A measuring method comprising:
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receiving a first light that is output from a first light source, reflected by or transmitted through an object to be measured, and transmitted through a filter that transmits light of a predetermined wavelength and a second light that is output from a second light source, reflected by or transmitted through the object to be measured, and transmitted through the filter by a first light receiving unit, and sending a first signal in response to the received first and the second lights through the first light receiving unit; receiving by a second light receiving unit, light of a different path from the light received by the first light receiving unit, and sending a second signal in response to the received light through the second light receiving unit; obtaining a difference signal between the first signal traveling through the first light receiving unit and the second signal traveling through the second light receiving unit by a difference extracting unit; and generating information of the object to be measured based on the signal obtained from the difference extracting unit by an information generating unit. - View Dependent Claims (15, 16, 17, 18)
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Specification