Method and system for obtaining enhanced signal to noise ratio in a laser imaging apparatus
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United States of America Patent
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Issued Date -
Mar 15, 2007
app pub date -
Aug 30, 2006
filing date -
Sep 15, 2005
priority date (Note) -
Abandoned
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Abstract
A method for measuring a small, low-frequency electrical current, comprising integrating the electrical current with an operational amplifier configured as a switched integrator to provide an output; digitizing the output of the integrator multiple times to obtain an array of measured values; and calculating a slope of the integrator output by fitting a least squares curve to the array of measured values, wherein the electrical current is proportional to the slope. A system for measuring a small, low-frequency electrical current, comprises an operational amplifier configured as a switched integrator connected to a source of the small, low-frequency electrical current; an analog-to-digital converter connected to the output of the switched integrator; a controller connected to the ADC for digitizing the output of the integrator multiple times to obtain an array of measured values; and a computer for calculating a slope of the integrator output by fitting a least squares curve to the array of measured values, wherein the electrical current is proportional to the slope.
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