Methods, devices and systems for biophysical sensing
A method can include attaching a sensor device contained in a sensor structure to a body; sensing motion of the body with at least one motion capacitive sensor of the sensor device that senses a capacitance change resulting from a difference in orientation of the motion capacitive sensor and a surface of the body. If motion of the body is not sensed with the motion capacitive sensor, sensor readings can be acquired with a biophysical sensor that emits signals into a portion of the body below the sensor structure, and generate data for a feature of the body with the sensor readings. If motion of the body is not sensed with the motion capacitive sensor, data for the feature of the body is not generated. Related devices and systems are also disclosed.
1 . A method, comprising:
attaching a sensor device contained in a sensor structure to a body;
sensing motion of the body with at least one motion sense electrode of a motion capacitive sensor of the sensor device that senses a capacitance change resulting from a difference in orientation of the at least one motion sense electrode and a surface of the body;
if motion of the body is not sensed with the motion capacitive sensor,
acquiring sensor readings with a biophysical sensor having a plurality of sensor electrodes comprising an array of radar sensor electrodes, including at least one sensor electrode that emits radar wave signals into a portion of the body below the sensor structure and at least one other sensor electrode that receives reflected radar waves from the body, and
generating data for a feature of the body with the sensor readings; and
if motion of the body is sensed with the motion capacitive sensor, not generating data for the feature of the body.
2 . The method of claim 1 , wherein the feature is a circulatory system feature of the body.
3 . The method of claim 1 , wherein the at least one motion sensing electrode measures changes in a self-capacitance of the at least one motion sensing electrode.
4 . The method of claim 1 , wherein the at least one motion sensing electrode comprises at least two motion sensing electrodes that measure changes in mutual capacitance between at least two of the motion sensing electrodes.
5 . A device, comprising:
a sensor structure configured to be attached to a body;
a motion capacitive sensor attached to the sensor structure and configured to activate a motion indication in response to capacitance changes resulting from a difference in orientation of at least one motion sense electrode of the motion capacitive sensor and a surface of the body, the at least one motion sense electrode configured to be disposed above the surface of the body when the sensor structure is attached to the body;
a biophysical sensor configured to be attached to the body that includes a plurality of sensor electrodes configured to be disposed above the surface of the body and configured to
in response to the motion indication being inactive,
acquire sensor readings with a biophysical sensor that emits signals into a portion of the body below the sensor structure, and
generate data for a feature of the body with the sensor readings; and
in response to the motion indication being active, not generate data for a feature of the body with the sensor readings; wherein
the biophysical sensor comprises a radar sensor that includes at least one sensor electrode configured as a transmitting antenna and at least one other sensor electrode configured as a receiving antenna.
6 . The device of claim 5 , wherein the biophysical sensor is configured to, in response to the motion indication being active, disable sensor readings to reduce power consumption.
7 . The device of claim 5 , wherein the biophysical sensor is attached to the sensor structure.
8 . The device of claim 5 , wherein:
the biophysical sensor comprises an array of electrodes; and
the at least one motion sense electrode is one of the electrodes in the array of electrodes.
9 . The device of claim 5 , wherein:
the biophysical sensor comprises an array of electrodes; and
the at least one motion sense electrode is different from the array of electrodes.
10 . A system, comprising:
a motion capacitive sensor configured to attach to a body and to sense motion of the body by detecting capacitance changes resulting from a difference in orientation of at least one motion sense electrode of the motion capacitive sensor and a surface of the body, the at least one motion sense electrode configured to be disposed above the surface of the body when the sensor structure is attached to the body; and
a biophysical sensor configured to attach to the body that includes a plurality of sensor electrodes configured to be disposed above the surface of the body and configured to
if motion of the body is not sensed with the motion capacitive sensor,
acquire sensor readings with a biophysical sensor that emits signals into a portion of the body below the sensor structure, and
generate data for a feature of the body with the sensor readings; and
if motion of the body is sensed with the motion capacitive sensor, not generate data for the feature of the body; wherein
the biophysical sensor comprises an array of electrodes comprising a radar sensing array.
11 . The system of claim 10 , wherein the motion capacitive sensor is selected from the group consisting of: a self-capacitance sensor and a mutual capacitance sensor.
12 . The system of claim 10 , wherein:
the at least one motion sense electrode is one of the electrodes in the array of electrodes.
13 . The system of claim 10 , wherein:
the at least one motion sense electrode is different from the array of electrodes.
14 . The system of claim 10 , wherein the capacitance sensor and biophysical sensor are part of a same sensor structure.