APPARATUS FOR ELECTRODERMAL ACTIVITY MEASUREMENT WITH CURRENT COMPENSATION
First Claim
1. An apparatus for measuring electrodermal activity, comprising:
- a first electrode in contact with a first portion of a stratum corneum of skin;
a second electrode in contact with a second portion of the stratum corneum and in electronic communication with the first electrode through the stratum corneum; and
a processing module electrically coupled to the first electrode and the second electrode and operable to (a) bias the first electrode at a first voltage V+ and the second electrode at a second voltage V−
, (b) measure a current flowing between the first electrode and the second electrode, the current corresponding to the conductance of the stratum corneum, (c) subtract a compensation current from the measured current, (d) measure a resulting current and produce an amplified output voltage, (e) measure a conductance of the stratum corneum, and (f) adjust at least one of the first voltage, the second voltage, and the compensation current to desaturate the output voltage.
1 Assignment
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Accused Products
Abstract
An apparatus for measuring electrodermal activity can include a first electrode in contact with a first portion and a second electrode in contact with a second portion of a stratum corneum, and in electronic communication with the second electrode through the stratum corneum. A processing module is electrically coupled to the first electrode and the second electrode and is operable to (a) bias the first electrode at a first voltage V+ and the second electrode at a second voltage V− (b) measure a current flowing between the first electrode and the second electrode, the current corresponding to the conductance of the stratum corneum, (c) subtract a compensation current from the measured current (d) measure a resulting current producing an amplified output voltage (e) measure a conductance of the stratum corneum, and (f) adjust at least one of the first voltage, the second voltage and the compensation current to desaturate the output voltage.
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Citations
22 Claims
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1. An apparatus for measuring electrodermal activity, comprising:
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a first electrode in contact with a first portion of a stratum corneum of skin; a second electrode in contact with a second portion of the stratum corneum and in electronic communication with the first electrode through the stratum corneum; and a processing module electrically coupled to the first electrode and the second electrode and operable to (a) bias the first electrode at a first voltage V+ and the second electrode at a second voltage V−
, (b) measure a current flowing between the first electrode and the second electrode, the current corresponding to the conductance of the stratum corneum, (c) subtract a compensation current from the measured current, (d) measure a resulting current and produce an amplified output voltage, (e) measure a conductance of the stratum corneum, and (f) adjust at least one of the first voltage, the second voltage, and the compensation current to desaturate the output voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A wearable device for measuring electrodermal activity, comprising:
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a housing configured to be removably associated with a user; a first electrode, at least a portion of the first electrode disposed outside the housing and configured to contact a first portion of a stratum corneum of skin when the housing is associated with the user; a second electrode, at least a portion of the first electrode disposed outside the housing and configured to contact a second portion of the stratum corneum of the skin when the housing is associated with the user; a processing module disposed in the housing and electrically coupled to the first electrode and the second electrode, the processing module operable to (a) bias the first electrode at a first voltage V+ and the second electrode at a second voltage V−
(b) measure a current flowing between the first electrode and the second electrode, the current corresponding to the conductance of the stratum corneum, (c) subtract a compensation current from the measured current, (d) measure a resulting current and produce an amplified output voltage, (e) measure a conductance of the stratum corneum, and (f) adjust at least one of the first voltage, the second voltage, and the compensation current to desaturate the output voltage;a communications module disposed in the housing, the communications module coupled to the processing module and configured to at least one of a display an electrodermal activity of the user, and communicate electrodermal activity data from the processing module to an external device; and a power source disposed in the housing and configured to provide electrical power to the processing module and the communications module. - View Dependent Claims (10, 11, 12, 14, 15, 16, 17, 18)
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19. A method for measuring electrodermal activity, comprising:
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disposing a first electrode and a second electrode on a stratum corneum of a user; biasing the first electrode at a first voltage and a second electrode at a second voltage; measuring a current flowing between the first electrode and the second electrode; subtracting a compensation current from the current flowing between the first electrode and the second electrode to get an input current; transforming the input current into an amplified output voltage; measuring an output voltage; measuring a conductance of the stratum corneum; determining if the output voltage is saturated; and increasing the compensation current to change the output voltage such that the output voltage is not saturated. - View Dependent Claims (13, 20, 21, 22)
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Specification