Photoplethysmography apparatus
First Claim
1. A photoplethysmography (PPG) apparatus comprising:
- at least one light source configured to generate a beam of source light having a source beam angle directed towards an external object;
at least one controllable beam angle adapter configured to be between the light source and the external object and configured to receive a beam-angle control signal indicative of a modified beam angle to be set, which differs from the source beam angle, the beam angle adapter being further configured to receive the beam of source light having the source beam angle and to provide the beam of source light with the modified beam angle to the external object;
at least one PPG sensor which is configured to provide a sensor signal indicative of scattered source light, which has been scattered by the external object and detected by the PPG sensor, and which comprises an AC signal component indicative of a change of an amount of blood or air in a body part and which allows determination of vital sign information of the external object; and
a PPG evaluation and control unit, which is configured to receive the sensor signal, to determine the modified beam angle based on the AC signal component of the sensor signal or based on both the AC signal component of the sensor signal and a DC signal component of the sensor signal, to determine and provide the beam-angle control signal based on the modified beam angle, and to determine and selectively provide at its output the AC signal.
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Accused Products
Abstract
The invention relates to a photoplethysmography (PPG) apparatus (100), comprising at least one light source (110) configured to generate a beam of source light (114) having a source beam angle (118) and at least one controllable beam angle adapter (120) configured to receive a beam-angle control signal (170) indicative of a modified beam angle (124) to be set, the beam angle adapter (120) being further configured to provide the beam of source light (114) with a modified beam angle (124) to an external object (130). The PPG apparatus (100) comprises at least one PPG sensor(140)configured to provide a sensor signal (145) indicative of source light (150) scattered by the external object (130), and a PPG evaluation and control unit (160) configured to receive the sensor signal (145), to provide the beam-angle control signal (170) and to provide at its output (180) an AC signal component of the sensor signal (145).
13 Citations
14 Claims
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1. A photoplethysmography (PPG) apparatus comprising:
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at least one light source configured to generate a beam of source light having a source beam angle directed towards an external object; at least one controllable beam angle adapter configured to be between the light source and the external object and configured to receive a beam-angle control signal indicative of a modified beam angle to be set, which differs from the source beam angle, the beam angle adapter being further configured to receive the beam of source light having the source beam angle and to provide the beam of source light with the modified beam angle to the external object; at least one PPG sensor which is configured to provide a sensor signal indicative of scattered source light, which has been scattered by the external object and detected by the PPG sensor, and which comprises an AC signal component indicative of a change of an amount of blood or air in a body part and which allows determination of vital sign information of the external object; and a PPG evaluation and control unit, which is configured to receive the sensor signal, to determine the modified beam angle based on the AC signal component of the sensor signal or based on both the AC signal component of the sensor signal and a DC signal component of the sensor signal, to determine and provide the beam-angle control signal based on the modified beam angle, and to determine and selectively provide at its output the AC signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for operating a photoplethysmography (PPG) apparatus the method comprising:
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providing at least one beam of source light having a source beam angle directed towards an external object; determining and providing a beam-angle control signal indicative of a modified beam angle to be set, which differs from the source beam angle of the at least one beam of source light; adapting the at least one beam of source light in dependence on the beam-angle control signal to set the modified beam angle by means of at least one beam angle adapter; providing a sensor signal indicative of scattered source light, which has been scattered by the external object, and which comprises an AC component indicative of a change of an amount of blood or air in a body part and which allows determination of vital sign information of the external object; and determining and selectively providing the AC signal component of the sensor signal;
whereindetermining and providing the beam-angle control signal is performed in dependence on determining the modified beam angle based on both the AC signal component of the sensor signal and a DC signal component of the sensor signal. - View Dependent Claims (11, 12, 13)
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14. A photoplethysmography (PPG) apparatus comprising:
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at least one light source configured to generate a beam of source light having a source beam angle directed towards an external object; at least one controllable beam angle adapter configured to be between the light source and the external object and configured to receive a beam-angle control signal indicative of a modified beam angle to be set, which differs from the source beam angle, the beam angle adapter being further configured to receive the beam of source light having the source beam angle and to provide the beam of source light with the modified beam angle to the external object; at least one PPG sensor which is configured to provide a sensor signal indicative of scattered source light, which has been scattered by the external object and detected by the PPG sensor, and which comprises an AC signal component indicative of a change of an amount of blood or air in a body part and which allows determination of vital sign information of the external object; and a PPG evaluation and control unit, which is configured to receive the sensor signal, to determine and provide the beam-angle control signal in dependence on the AC signal component of the sensor signal or in dependence on the AC signal component of the sensor signal and a DC signal component of the sensor signal and to determine and selectively provide at its output the AC signal; wherein the PPG evaluation and control unit is configured to determine a ratio difference between a ratio of the AC signal component of the sensor signal and the DC signal component of the sensor signal and a predetermined reference ratio thereof, and to provide the beam-angle control signal in dependence on the ratio difference.
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Specification