System and Method for Measurement of Physiological Data with Light Modulation
First Claim
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1. A device for measuring physiological data of a subject comprising:
- a) a light modulation unit for generating at least one modulated light signal by modulating at least one light source at at least one predefined frequency, said at least one modulated light signal being generated before irradiation onto said subject and each said at least one modulated light signal having a different wavelength;
b) an optical detection unit for receiving a composite spectrophotometric light signal and converting said composite spectrophotometric light signal into an electrical signal, said composite spectrophotometric light signal being generated when a physiological signal of said subject is regulated by said at least one modulated light signal; and
c) a signal processing unit adapted for;
i) converting said electrical signal into a digital signal;
ii) obtaining a frequency spectrum of said digital signal;
iii) tracking at least one dominant spectral peak of said frequency spectrum, each said dominant spectral peak corresponding to each said at least one predefined frequency;
iv) recognizing at least one minor spectral peak at said frequency spectrum from the vicinity of said at least one dominant spectral peak; and
v) determining said physiological data from said at least one dominant spectral peak and said at least one minor spectral peak.
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Abstract
The present invention discloses a device for measuring physiological data of a subject. It comprises a light modulation unit, an optical detection unit and a signal processing unit. The present invention can operate in an active mode or a passive mode to measure a subject'"'"'s heart rate, respiratory information, haemoglobin level, cardiac output or oxygen saturation of the blood, etc. Fourier Transform based lock-in technique is used to detect the physiological signals reliably even when the signal is weak. In addition, ambient light can be used as the light source to complete the measurement.
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Citations
20 Claims
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1. A device for measuring physiological data of a subject comprising:
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a) a light modulation unit for generating at least one modulated light signal by modulating at least one light source at at least one predefined frequency, said at least one modulated light signal being generated before irradiation onto said subject and each said at least one modulated light signal having a different wavelength; b) an optical detection unit for receiving a composite spectrophotometric light signal and converting said composite spectrophotometric light signal into an electrical signal, said composite spectrophotometric light signal being generated when a physiological signal of said subject is regulated by said at least one modulated light signal; and c) a signal processing unit adapted for; i) converting said electrical signal into a digital signal; ii) obtaining a frequency spectrum of said digital signal; iii) tracking at least one dominant spectral peak of said frequency spectrum, each said dominant spectral peak corresponding to each said at least one predefined frequency; iv) recognizing at least one minor spectral peak at said frequency spectrum from the vicinity of said at least one dominant spectral peak; and v) determining said physiological data from said at least one dominant spectral peak and said at least one minor spectral peak. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for measuring physiological data of a subject comprising:
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a) a light modulation unit for generating at least one modulated light signal by modulating an ambient light reflected from said subject at at least one predefined frequency, each said at least one modulated light signal having a different wavelength; b) an optical detection unit for receiving a composite spectrophotometric light signal and converting said composite spectrophotometric light signal into an electrical signal, said composite spectrophotometric light signal being generated when a physiological signal of said subject is regulated by said at least one modulated light signal; c) a processing unit for determining said physiological data from said electrical signal. - View Dependent Claims (13, 14, 15)
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16. A method for determining physiological data of a subject comprising:
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a) generating at least one modulated light signal by modulating at least one light source at at least one predefined frequency, each said at least one modulated light signal having a different wavelength; b) detecting a composite spectrophotometric light signal and converting said composite spectrophotometric light signal into an electrical signal, said composite spectrophotometric light signal being generated when a physiological signal of said subject is regulated by said at least one modulated light signal; c) converting said electrical signal into a digital signal; d) obtaining a frequency spectrum of said digital signal; e) tracking at least one dominant spectral peak at said frequency spectrum, each said dominant spectral peak corresponding to each said at least one predefined frequency; f) recognizing at least one minor spectral peak at said frequency spectrum from the vicinity of said at least one dominant spectral peak; and g) determining said physiological data from said at least one dominant spectral peak and said at least one minor spectral peak. - View Dependent Claims (17, 18, 19, 20)
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Specification