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KMID : 0372919950160020239
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Journal of Biomedical Engineering Research
1995 Volume.16 No. 2 p.239 ~ p.256
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A Design of Optimal Masks in Hadamard Transfrom Spectrometers
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Abstract
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The method of increasing signal to noise ratio(SNR) in a Hadamard transfrom spectrometer(HTS) is multiplexing. The multiplexing is executed by a mask. Conventional masks are mechanical or electro-optical. A mechanical mask has disadvantages of jamming and misalignment. A stationary mask has disadvantages of jamming and misalignment. A stationary electro-optical mask has a disadvantage of information losses caused by spacers which partition mask elements. In this paper a mixed-concept electro-optical mask(MCEOM) is developed by expanding the length of a spacer to that of l on-off mask element. An MCEOM is operated by stepping a movable mask. 2N measurements are required for N spectrum estimates. The average mean square error (AMSE) using MCEOM is equal to that using a stationary electro-optical mask without spacers for large N. The cost of manufacturing an MCEOM is lower than that of producing a conventional electro-optical mask because an MCEOM is lower than that of producing a conventional electro-optical mask because an MCEOM needs only (N+1)/2 on-off mask elements whereas the conventional electro-optical mask needs No on-off mask elements. There are no information losses in the spectrometers having an MCEOM.
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