Apparatus and method for detecting biological information
Provided are apparatuses and methods for detecting biological information. An apparatus for detecting biological information may include a biological signal measurement unit having at least two light emission elements having different light emission angles. The at least two light emission elements may include different types of light sources. The at least two light emission elements may include multiple light sources of the same type, and in this case, an optical element configured to adjust a light emission angle of one of the light sources may be provided. The apparatus for detecting biological information may include a biological signal measurement unit including a light emitting unit having variable light emission angle. The apparatus for detecting biological information may further include a data processor configured to extract and analyze biological information of a subject from data measured by the biological signal measurement unit.
1. An apparatus for detecting biological information, the apparatus comprising:
a biological signal measurement unit comprising a light emission portion and a photodetector, the light emission portion comprising at least one light emitting unit, the at least one light emitting unit comprising a light source and a light emission angle control element configured to change a light emission angle of the light source,
wherein the photodetector is configured to detect light generated by the light emission portion and modulated by a subject, and
wherein the biological signal measurement unit is further configured to generate a plurality of signals of the subject by using the light detected by the photodetector while the light emission angle control element arbitrarily changes the light emission angle of the light source of the at least one light emitting unit; and
a data processor configured to extract and analyze the biological information of the subject from data corresponding to a signal selected from among the plurality of signals generated by the biological signal measurement unit.
2. The apparatus of claim 1 , wherein the light emission angle control element comprises a variable focus lens.
3. The apparatus of claim 2 , wherein the light emission angle control element comprises one of an auto focusing module (AFM) comprising a voice coil motor (VCM), a liquid lens comprising an electrowetting unit, and a variable focal length microlens comprising liquid crystal.
4. The apparatus of claim 1 , wherein the data processor is further configured to select, from the plurality of signals, a signal having a signal-to-noise ratio (SNR) higher than that of at least one another signal of the plurality of signals, and extract and analyze the biological information of the subject from data corresponding to the selected signal.
5. The apparatus of claim 1 , wherein the photodetector comprises a plurality of light receiving devices, and
the plurality of light receiving devices are disposed in an array around at least a part of the light emission portion.
6. The apparatus of claim 1 , wherein the at least one light emitting unit comprises a plurality of light emitting units.
7. The apparatus of claim 1 , wherein the light emission portion further comprises at least one another light emission element having a fixed light emission angle.
8. The apparatus of claim 1 , wherein the biological signal measurement unit is configured to measure at least one of a surface pulse wave and a photoplethysmogram (PPG) of the subject.
9. The apparatus of claim 1 , wherein the biological information analyzed by the data processor comprises at least one of a blood pressure, a heart rate, a blood oxygen saturation, a blood vessel elasticity, a blood flow rate, and arterial stiffness.
10. A method of detecting biological information, the method comprising:
outputting light from at least one light emitting unit, thereby irradiating a measurement area of a subject, wherein the at least one light emitting unit comprises a light source and a light emission angle control element configured to change a light emission angle of the light source;
detecting light output by the at least one light emitting unit and modulated by the subject;
generating a plurality of signals from the detected light, which is output by the at least one light emitting unit while the light emission angle of the light source of the at least one light emitting unit is arbitrarily changed; and
extracting and analyzing the biological information of the subject using a signal selected from among the generated plurality of signals.
11. The method of claim 10 , further comprising:
selecting, from the plurality of signals, a signal having a signal-to-noise ratio (SNR) higher than that of at least one another signal of the plurality of signals,
wherein the extracting and analyzing comprises extracting and analyzing the biological information of the subject using the selected signal.
12. The method of claim 10 , wherein the light emission angle control element comprises a variable focusing lens.