Patent ID: 11903481
Assignee: COLGATE-PALMOLIVE COMPANY
Field: Measurement (Instruments)
Classification: CPC A  G | IPC A

Claim 0:
1. A plaque detecting device comprising:
a light emitting unit which emits excitation light toward a surface of a tooth;
a first light receiving unit which receives radiated light from the tooth surface induced by the excitation light, wherein the first light receiving unit extracts, from said radiated light, a first wavelength region, and obtains a first output value corresponding to an intensity of the radiated light in the first wavelength region;
a second light receiving unit which receives radiated light from the tooth surface induced by the excitation light, wherein the second light receiving unit extracts, from said radiated light, a second wavelength region, and obtains a second output value corresponding to an intensity of the radiated light in the second wavelength region;
a first zero point adjustment unit which measures a first ambient output value and a second ambient output value when the light emitting unit is not emitting excitation light.