Temperature-monitoring earbud device
A device for measuring a body temperature includes an earbud configured for insertion into at least a portion of an ear canal of a user to thereby create a substantially sealed ear canal. A temperature sensing element is fixed to the earbud at a location in which the temperature sensing element is thermally coupled to air in the sealed ear canal when the earbud is at least partially inserted into the ear canal. The temperature sensing element has a temperature-dependent electrical characteristic. The temperature sensing element is in electrical communication with a circuit that is configured to determine a temperature of the air in the sealed ear canal of the user in response to the temperature-dependent electrical characteristic.
1. A method of determining a body temperature, the method comprising:
determining, from a temperature-dependent electrical characteristic of a non-contact temperature sensor, a temperature of the air near the temperature sensing element;
determining solely from temperature data acquired from the non-contact temperature sensor that an earbud is at least partially inserted into an ear canal of a user so that a sealed ear canal is created, the non-contact temperature sensor being fixed to a surface of the earbud and being thermally coupled to air in the sealed ear canal;
waiting for a period of time for a temperature of the air in the sealed ear canal to achieve a substantially constant value; and
reporting the temperature of the air in the sealed ear canal as determined from the temperature-dependent electrical characteristic of the non-contact temperature sensor.
2. The method of claim 1 wherein the period of time for the temperature of the air in the sealed ear canal to achieve the substantially constant value is predetermined.
3. The method of claim 1 wherein the waiting for a period of time comprises monitoring the temperature-dependent electrical characteristic of the non-contact temperature sensor until a rate of change of the temperature-dependent characteristic is less than a predetermined threshold rate.
4. The method of claim 1 wherein determining that the earbud is at least partially inserted into the ear canal comprises determining that a rate of increase in a temperature sensed by the non-contact temperature sensor exceeds a threshold rate.
5. The method of claim 1 wherein determining that the earbud is at least partially inserted into the ear canal comprises determining that the temperature sensed by the non-contact temperature sensor exceeds a predefined temperature.
6. The method of claim 1 wherein reporting the temperature comprises storing a time-series of temperature values in a data storage element.
7. The method of claim 1 wherein reporting the temperature comprises transmitting data representing the temperature value to a circuit in communication with the earbud.
8. The method of claim 7 wherein power to a device in communication with the earbud is reduced in response to the data transmitted to the circuit.
9. The method of claim 8 wherein the device in communication with the earbud is an audio source device.