Patent ID: 11903481
Assignee: OMRON HEALTHCARE CO., LTD.
Field: Measurement (Instruments)
Classification: CPC A  G | IPC A

Claim 10:
11. A method of detecting plaque comprising:
a) providing a light emitting unit, first and second light receiving units, and a first zero point adjustment unit;
b) activating the light emitting unit to emit excitation light toward a surface of a tooth;
c) receiving radiated light via the first and second light receiving units;
d) extracting first and second wavelength regions from the radiated light via the first and second light receiving units;
e) obtaining first and second radiated output values corresponding to intensities of the first and second wavelength regions via the first and second light receiving units;
f) deactivating the light emitting unit;
g) receiving ambient light via the first and second light receiving units;
h) extracting first and second wavelength regions from the ambient light via the first and second light receiving units;
i) obtaining first and second ambient output values corresponding to intensities of the first and second wavelength regions via the first and second light receiving units;
j) computing first and second output values by subtracting the first and second ambient output values from the first and second radiated output values.