Dark current subtraction with abbreviated reference cycles and recursive filtering
First Claim
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1. A signal correction method comprising:
- providing a flow of light to a photoelectric conversion device;
alternately conducting and interrupting the flow of light to the device;
generating an intermixed signal by means of the device while conducting the flow of light to the device, the intermixed signal including a desired signal intermixed with an unwanted dark signal, the desired signal being generated by the device in response to conducting the flow of light to the device;
generating a dark signal alone by means of the device while interrupting flow of the flow of light to the device;
filtering the dark signal alone to produce a filtered dark signal; and
subtracting the filtered dark signal from the intermixed signal to produce a corrected signal, which is representative of the desired signal.
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Abstract
A method and apparatus for performing dark signal correction on a photoelectric conversion device. A flow of light to the device is alternately conducted and interrupted. The device generates an intermixed signal while the flow of light is conducted to the device, the intermixed signal including a desired signal intermixed with an unwanted dark signal. The device generates a dark signal alone while the flow of light to the device is interrupted. The dark signal alone is filtered to produce a filtered dark signal. The filtered dark signal is subtracted from the intermixed signal to produce a corrected signal, which is representative of the desired signal.
36 Citations
14 Claims
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1. A signal correction method comprising:
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providing a flow of light to a photoelectric conversion device; alternately conducting and interrupting the flow of light to the device; generating an intermixed signal by means of the device while conducting the flow of light to the device, the intermixed signal including a desired signal intermixed with an unwanted dark signal, the desired signal being generated by the device in response to conducting the flow of light to the device; generating a dark signal alone by means of the device while interrupting flow of the flow of light to the device; filtering the dark signal alone to produce a filtered dark signal; and subtracting the filtered dark signal from the intermixed signal to produce a corrected signal, which is representative of the desired signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for sensing a flow of light from a light source comprising:
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a means for alternately conducting and interrupting the flow of light from the light source; a photoelectric conversion device optically coupled to the light source for generating an intermixed signal while the flow of light is conducted to the device, the intermixed signal including a desired signal intermixed with an unwanted dark signal, the desired signal being generated by the device in response to the flow of light, the photoelectric conversion device generating a dark signal alone while the flow of light from the light source is interrupted; a filtering means coupled to the photoelectric conversion device for filtering the dark signal alone to produce a filtered dark signal; and a subtraction means coupled to the filtering means and the photoelectric conversion device for subtracting the filtered dark signal from the intermixed signal to produce a corrected signal, which is representative of the desired signal. - View Dependent Claims (8, 9, 10, 11)
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12. A spectrographic method for analyzing a sample material comprising:
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providing a photoelectric conversion device; stimulating the sample material to generate a flow of light therefrom; alternately conducting and interrupting the flow of light from the sample material to the device; generating an intermixed signal by means of the photoelectric conversion device while conducting the flow of light to the device, the intermixed signal including a desired signal intermixed with an unwanted dark signal, the desired signal being generated by the device in response to conducting the flow of light to the device; generating a dark signal alone by means of the device during interruptions of the flow of light to the device; filtering the dark signal alone to produce a filtered dark signal; and subtracting the filtered dark signal from the intermixed signal to produce a corrected signal, which is representative of the desired signal. - View Dependent Claims (13, 14)
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Specification