Method and apparatus for improvement of spectrometer stability, and multivariate calibration transfer
First Claim
1. A method for determining a digital filter to compensate for a frequency response of one or more sources of error in the measurement of a spectrum with an interferometric spectrometer, comprising:
- Step A, measuring the frequency response of one or more sources of error to be compensated;
Step B, determining a target filter response from an inverse of the cumulative response of the responses measured in Step A; and
Step C, determining a digital filter from the target filter response using a discrete sum of cosines with a phase argument.
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Abstract
The present invention provides methods and apparatuses that can improve measurement accuracy in interferometers. The invention provides methods for determining digital compensation filters that measure a frequency response or responses to be compensated, and then determining a filter target response from the inverse of the frequency response or responses. A digital compensation filter can be determined from the filter target response using a discrete sum of cosines with a phase argument. The invention also allows other desired filter responses to be integrated into the filter target response before determining the digital compensation filter.
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Citations
9 Claims
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1. A method for determining a digital filter to compensate for a frequency response of one or more sources of error in the measurement of a spectrum with an interferometric spectrometer, comprising:
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Step A, measuring the frequency response of one or more sources of error to be compensated; Step B, determining a target filter response from an inverse of the cumulative response of the responses measured in Step A; and Step C, determining a digital filter from the target filter response using a discrete sum of cosines with a phase argument. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification