Method of obtaining an optical FT spectrum
Patent 5923422 Issued on July 13, 1999. Estimated Expiration Date: 
February 2, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 2, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesOptical signal measurement instrument and wide dynamic range optical receiver for use therein Patent #: 5491548 InventorsAssigneeApplicationNo. 017172 filed on 02/02/1998US Classes:356/451SpectroscopyExaminersPrimary: Kim, Robert H.Assistant: Lee, Andrew H. Attorney, Agent or FirmInternational ClassG01B 009/02Foreign Application Priority Data1997-02-07 DEAbstractA method of obtaining an FT spectrum according to Brault is improved in that the compensation filter is determined by recording a broad-band effective interferogram, carrying out complex Fourier transformation, forming a mean value of the phase spectra, converting the abscissa values into electrical frequencies, and establishing the transfer function of the detector and of the further signal processing elements, wherein the free parameters of the transfer function are chosen such that the phase response of the transfer function deviates as little as possible from the mean value of the phase spectrum of the effective recorded interferogram. If necessary, the determined transfer function is then digitized. The compensation filter is then determined as the inverse of the discrete transfer function. In this way, deconvolution of the signal processing elements transfer function from the spectra is facilitated in a particularly simple and effective manner.Other References
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