Component Concentration Measuring Device
A measuring unit ( 103 ) chronologically measures a heart rate or pulse rate of a measurement subject. A computing unit ( 104 ) obtains a statistic of measuring results measured by the measuring unit ( 103 ). The computing unit ( 104 ) obtains a statistic of a plurality of measuring results measured during a set period of time by the measuring unit ( 103 ) and stored in a storage unit. A correction unit ( 105 ) corrects a photoacoustic signal detected by a detection unit ( 102 ) based on the statistic obtained by the computing unit ( 104 ). The correction unit ( 105 ) corrects the photoacoustic signal that is detected by the detection unit ( 102 ) immediately after the latest value of the heart rate or pulse rate used in the calculation of the statistic by the computing unit ( 104 ) is measured. The correction unit ( 105 ) performs the correction by adding a value obtained by multiplying the statistic obtained by the computing unit ( 104 ) by a pre-set correction coefficient, to the photoacoustic signal detected by the detection unit ( 102 ).
1 .- 6 . (canceled)
7 . A component concentration measuring device comprising:
a light emitting device configured to irradiate a measurement site of a measurement subject with a light beam having a wavelength that is absorbed by a measurement target substance;
a detector configured to chronologically detect a photoacoustic signal generated in the measurement site that is irradiated with the light beam;
a measuring circuit configured to chronologically measure a heart rate or a pulse rate of the measurement subject;
a processor configured to obtain a statistic of a plurality of values of the heart rate or the pulse rate chronologically measured by the measuring circuit; and
a correction circuit configured to correct the photoacoustic signal detected by the detector based on the statistic obtained by the processor.
8 . The component concentration measuring device according to claim 7 , wherein
the correction circuit is further configured to correct the photoacoustic signal that is detected by the detector immediately after a latest value of the heart rate or the pulse rate used in calculating the statistic by the processor is measured.
9 . The component concentration measuring device according to claim 7 , wherein:
the correction circuit is configured to correct the photoacoustic signal by adding a value obtained by multiplying the statistic obtained by the processor by a pre-set correction coefficient to the photoacoustic signal detected by the detector.
10 . The component concentration measuring device according to claim 7 , wherein:
the processor is configured to obtain, as the statistic, a dispersion, a standard deviation, an average, or a temporal differential value of the plurality of values of the heart rate or the pulse rate chronologically measured by the measuring circuit.
11 . The component concentration measuring device according to claim 7 , further comprising a concentration calculator configured to obtain a concentration of the substance based on the photoacoustic signal corrected by the correction circuit.
12 . The component concentration measuring device according to claim 7 , wherein the measurement target substance is glucose, and the light emitting device is configured to emit the light beam having a wavelength that is absorbed by glucose.
13 . A method comprising:
irradiating, by a light emitting device, a measurement site of a measurement subject with a light beam having a wavelength that is absorbed by a measurement target substance;
chronologically detect a photoacoustic signal generated in the measurement site that is irradiated with the light beam;
chronologically measure a heart rate or a pulse rate of the measurement subject;
obtain, by a processor, a statistic of a plurality of values of the heart rate or the pulse rate that is chronologically measured; and
correcting the photoacoustic signal based on the statistic to obtain a corrected photoacoustic signal.
14 . The method according to claim 13 , wherein correcting the photoacoustic signal comprises correcting the photoacoustic signal immediately after a latest value of the heart rate or the pulse rate used in calculating the statistic is measured.
15 . The method according to claim 13 , wherein correcting the photoacoustic signal comprises adding a value obtained by multiplying the statistic by a pre-set correction coefficient to the photoacoustic signal.
16 . The method according to claim 13 , wherein obtaining the statistic comprises obtaining, as the statistic, a dispersion, a standard deviation, an average, or a temporal differential value of the plurality of values of the heart rate or the pulse rate that is chronologically measured.
17 . The method according to claim 13 , further comprising obtaining a concentration of the substance based on the corrected photoacoustic signal.
18 . The method according to claim 13 , wherein the measurement target substance is glucose, and the light emitting device is configured to emit the light beam having a wavelength that is absorbed by glucose.