Fall detectors and a method of detecting falls
First Claim
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1. A fall detector for detecting falls of a user or an object to which the fall detector is attached, the fall detector comprising:
- an air flow channel;
an air flow sensor disposed adjacent the air flow channel and configured to measure air flow along the air flow channel;
an accelerometer configured to measure accelerations of the fall detector;
a processor configured to;
estimate an orientation of the fall detector from the measurements from the accelerometer,estimate a vertical velocity from the measurements from the air flow sensor and the estimated orientation,estimate a change in altitude from the estimated vertical velocity,determine whether a fall has occurred based on the estimated change in altitude.
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Abstract
There is provided a fall detector for detecting falls of a user or an object to which the fall detector is attached, characterized in that the fall detector comprises an air flow sensor for providing measurements indicative of vertical velocity and/or changes in altitude of the fall detector.
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Citations
14 Claims
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1. A fall detector for detecting falls of a user or an object to which the fall detector is attached, the fall detector comprising:
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an air flow channel; an air flow sensor disposed adjacent the air flow channel and configured to measure air flow along the air flow channel; an accelerometer configured to measure accelerations of the fall detector; a processor configured to; estimate an orientation of the fall detector from the measurements from the accelerometer, estimate a vertical velocity from the measurements from the air flow sensor and the estimated orientation, estimate a change in altitude from the estimated vertical velocity, determine whether a fall has occurred based on the estimated change in altitude. - View Dependent Claims (2, 3, 4)
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5. A fall detector for detecting falls of a user or an object to which the fall detector is attached, the fall detector comprising:
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an air flow sensor configured to provide air flow measurements indicative of air flow velocity, the air flow sensor including; an air flow channel, the air flow measurements being indicative of an air flow velocity in the air flow channel, an electrically driven thermal element on a front side of the thermal air flow sensor arranged to face the air flow channel, and a bond pad coupled electrically to the electrically driven thermal element, the bond pad being arranged to face away from the front side to be accessible for contact from a backside of the air flow sensor, the air flow measurements being output via the bond pad, an accelerometer configured to measure accelerations of the fall detector; and a processor configured to process the air flow measurements from the bond pad and the thermal element and the acceleration measurements from the accelerometer to determine whether a fall has occurred. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A method in a fall detector of detecting falls of a user or an object to which the fall detector is attached, the method comprising:
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with a thermal air flow sensor, which is disposed adjacent an air flow channel of the fall detector, measuring air flow along the air flow channel of the fall detector; measuring accelerations of the fall detector with an accelerometer; and with a processor, estimating an orientation of the fall detector from the measurements from the accelerometer, estimating a vertical velocity from the measurements from the air flow sensor and the estimated orientation, estimating a change in altitude from the estimated vertical velocity, and determining whether a fail has occurred based on the estimated change in altitude. - View Dependent Claims (12)
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13. A fall detector comprising:
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an accelerometer configured to measure orientation and accelerations; an air flow sensor configured to measure air flow through a channel; and a processor configured to; with the orientation measurements from the accelerometer, identify air flow measurement components in a vertical direction, from the air flow measurement components in the vertical direction, generate a vertical velocity profile indicating how the velocity changes over time, from the accelerations measured by the accelerometer, generating an acceleration profile which indicates timing and magnitude of impacts, and determining whether a fall has taken place from the vertical velocity profile and the acceleration profile. - View Dependent Claims (14)
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Specification