AMBIENT LIGHT COMPENSATION CIRCUIT FOR ANALYTE MEASUREMENT SYSTEMS
First Claim
Patent Images
8. An analyte meter comprising:
- a processing unit;
a test strip port for receiving a test strip inserted therein;
an LED proximate to the test strip port for illuminating the test strip with a light pulse when the LED is activated, the LED electrically connected to the processing unit for receiving an activation signal therefrom;
a photodiode for detecting light from the test strip; and
a compensation circuit connected to the photodiode and the processing unit, and configured to detect a level of ambient light impacting the photodiode.
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Abstract
A blood analyte measurement system is configured to receive a test strip. An LED proximate to the test strip is used to illuminate the test strip and, in conjunction with a photodiode, to determine its type. A compensation circuit of the measurement system insures that ambient light does not cause interference with the LED illumination to prevent saturation of the photodiode.
3 Citations
25 Claims
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8. An analyte meter comprising:
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a processing unit; a test strip port for receiving a test strip inserted therein; an LED proximate to the test strip port for illuminating the test strip with a light pulse when the LED is activated, the LED electrically connected to the processing unit for receiving an activation signal therefrom; a photodiode for detecting light from the test strip; and a compensation circuit connected to the photodiode and the processing unit, and configured to detect a level of ambient light impacting the photodiode. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of operating an analyte meter, the method comprising:
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receiving a test strip; monitoring a voltage level of a compensation circuit that is responsive to an ambient light intensity proximate to the analyte meter; and analyzing the received test strip only if the voltage level has remained substantially constant for a preselected time duration. - View Dependent Claims (1, 2, 3, 4, 5, 6, 7, 18, 19, 20, 21, 22, 23, 24, 25)
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23-1. The method of claim 22, further comprising configuring the compensation circuit to pass a portion of the voltage signal corresponding to the light pulse.
Specification