Apparatus and method for system identification
DCFirst Claim
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1. A method for analyzing light emissions from a luminescent sample comprising the following steps:
- a. providing excitation light to a luminescent sample;
b. detecting emitted luminescence from the luminescent sample;
c. sampling the detected luminescence to create a digital signal;
d. analyzing the emitted luminescence by processing the digital signal with a linear second-order digital IIR filter applying at least a portion of a modified Goertzel algorithm; and
e. transforming the linearly-filtered digital signal using control logic to compute a real portion and an imaginary portion to determine the phase shift between the excitation light and the emitted luminescence.
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Abstract
Methods and apparatus for system identification operate by computing phase and amplitude using linear filters. By digitally processing the linearly filtered signals or data, the phase and amplitude based on measurements of the input and output of a system, are determined.
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Citations
16 Claims
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1. A method for analyzing light emissions from a luminescent sample comprising the following steps:
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a. providing excitation light to a luminescent sample; b. detecting emitted luminescence from the luminescent sample; c. sampling the detected luminescence to create a digital signal; d. analyzing the emitted luminescence by processing the digital signal with a linear second-order digital IIR filter applying at least a portion of a modified Goertzel algorithm; and e. transforming the linearly-filtered digital signal using control logic to compute a real portion and an imaginary portion to determine the phase shift between the excitation light and the emitted luminescence. - View Dependent Claims (2, 3, 4, 5)
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6. A luminescent light measurement apparatus comprising:
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a. an excitation light source configured to transfer excitation light to a fluid medium; b. a luminescent probe configured to transfer emission light in response to the excitation light; c. a detector system configured to detect the emission light and generate an analog signal corresponding to the emission light; d. a converter for converting the analog signal into a digital signal; and e. a digitally-implemented linear second-order IIR filter for applying at least a portion of a modified Goertzel algorithm to the digital signal; and f. a processor programmed to transform the linearly filtered digital signal using control logic to compute a real portion and an imaginary portion and to determine a phase shift between the excitation light and the emission light. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A method for analyzing light emissions from a luminescent sample comprising the following steps:
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a. providing excitation light to a luminescent sample; b. detecting emitted luminescence from the luminescent sample; c. sampling the detected emitted luminescence to create a first digital signal; d. processing the first digital signal with a linear second-order digital IIR filter applying at least a portion of a modified Goertzel algorithm to create a first filtered signal; e. transforming the first filtered signal using control logic to compute a real portion and imaginary portion to determine a first phase shift between the excitation light and the first digital signal; f. providing reference light to the luminescent sample; g. detecting emanated reference light from the luminescent sample; h. sampling the detected emanated reference light to create a second digital signal; i. processing the second digital signal with the linear second-order digital IIR filter applying at least a portion of the modified Goertzel algorithm to create a second filtered signal; j. transforming the second filtered signal using control logic to compute a real portion and imaginary portion to determine a second phase shift between the reference light and the second digital signal; and k. subtracting the first phase shift from the second phase shift to determine the phase difference between the excitation light and the emitted luminescence.
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13. An apparatus for analyzing light emissions from a luminescent sample, comprising:
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a. a luminescent sample comprising first and second surfaces that emanates luminescent light in response to excitation light and reference light in response to reference light; b. an excitation light source opposed to the first surface so that luminescent light emanates from the luminescent sample; c. a reference light source opposed to one surface so that reference light emanates from the luminescent sample; d. a detector of luminescent and reference light opposed to one surface so that luminescent light and reference light are detected; e. an analog-to-digital converter connected to the output of the detector; f. a filter connected to the analog-to-digital converter, the filter being a linear second-order digital IIR filter applying at least a portion of a modified Goertzel algorithm; g. control logic connected to the filter that computes (1) real and imaginary portions of the filter output corresponding to the luminescent light and then a first phase shift based on those portions; (2) real and imaginary portions of the filter output corresponding to the reference light and then a second phase shift based on those portions; h. a subtractor connected to the control logic that subtracts the first phase shift from the second phase shift to determine the phase difference between the excitation light and the luminescence light. - View Dependent Claims (14, 15, 16)
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Specification