Pulse photometer
First Claim
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1. A pulse photometer comprising:
- an emitter that emits a first light beam of a first wavelength, a second light beam of a second wavelength, and a third light beam of a third wavelength;
a detector that outputs a first intensity signal in accordance with a first intensity of the first light beam that is transmitted through or reflected from a living tissue of a subject, a second intensity signal in accordance with a second intensity of the second light beam that is transmitted through or reflected from the living tissue of the subject, and a third intensity signal in accordance with a third intensity of the third light beam that is transmitted through or reflected from the living tissue of the subject;
a first signal separator that separates a first signal component of a first observed signal pair of the first intensity signal and the third intensity signal from a first noise component of the first observed signal pair;
a second signal separator that separates a second signal component of a second observed signal pair of the second intensity signal and the third intensity signal from a second noise component of the second intensity signal pair;
a first determining section that determines whether a first difference between a first signal absorbance ratio of the first signal component and a first noise absorbance ratio of the first noise component is equal to or larger than a first predetermined value;
a second determining section that, when it is determined that the first difference is not equal to or larger than the first predetermined value, determines whether a second difference between a second signal absorbance ratio of the second signal component and a second noise absorbance ratio of the second noise component is equal to or larger than a second predetermined value; and
a concentration calculating section that calculates a concentration of a light absorption material in blood of the subject based on a fundamental frequency of the first signal component or calculates the concentration of the light absorption material in blood based on a fundamental frequency of the second signal component.
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Abstract
A pulse photometer includes a light emitter, a light detector, a first signal separator that separates a first signal component and a first noise component, a second signal separator that separates a second signal component and a second noise component, a first determining section, a second determining section, and a concentration calculating section that calculates a concentration of a light absorption material in blood of the subject based on a fundamental frequency of the first signal component or a fundamental frequency of the second signal component.
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Citations
7 Claims
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1. A pulse photometer comprising:
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an emitter that emits a first light beam of a first wavelength, a second light beam of a second wavelength, and a third light beam of a third wavelength; a detector that outputs a first intensity signal in accordance with a first intensity of the first light beam that is transmitted through or reflected from a living tissue of a subject, a second intensity signal in accordance with a second intensity of the second light beam that is transmitted through or reflected from the living tissue of the subject, and a third intensity signal in accordance with a third intensity of the third light beam that is transmitted through or reflected from the living tissue of the subject; a first signal separator that separates a first signal component of a first observed signal pair of the first intensity signal and the third intensity signal from a first noise component of the first observed signal pair; a second signal separator that separates a second signal component of a second observed signal pair of the second intensity signal and the third intensity signal from a second noise component of the second intensity signal pair; a first determining section that determines whether a first difference between a first signal absorbance ratio of the first signal component and a first noise absorbance ratio of the first noise component is equal to or larger than a first predetermined value; a second determining section that, when it is determined that the first difference is not equal to or larger than the first predetermined value, determines whether a second difference between a second signal absorbance ratio of the second signal component and a second noise absorbance ratio of the second noise component is equal to or larger than a second predetermined value; and a concentration calculating section that calculates a concentration of a light absorption material in blood of the subject based on a fundamental frequency of the first signal component or calculates the concentration of the light absorption material in blood based on a fundamental frequency of the second signal component. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification