Super-Dynamic-Range and Super-Quantization Methods for FT-IR Spectra

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Abstract:

Numerical methods are proposed for expanding the dynamic range and increasing the quantization resolution of Fourier transform infrared spectrum data. In these methods, an interferogram is oversampled at a rate higher than the Nyquist sampling rate. From the oversampled interferogram data, the full-range interferogram or the lost quantization bits are recovered by using the Gerchberg-Papoulis iterative algorithm, in-corporating constraints on the amplitude range of the interferogram and on the band limitation and non-negativity of the spectrum. Experimental results for IR absorption spectra of cyclohexene are shown in order to demonstrate the capabilities of the methods.

Keywords: Dynamic range; Enhancement; FT-IR; Quantization

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702934334903

Affiliations: 1: Department of Applied Physics, Osaka University, Suita, Osaka 565, Japan 2: Department of Applied Physics, Osaka University, Suita, Osaka 565, Japan; presently at Material and Device Research Laboratory, Matsushita Electric Industrial Co., Ltd., Kadoma, Osaka 571, Japan

Publication date: April 1, 1993

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