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A novel methodology for signal recovery in linear time invariant system for medicine applications

Melo M. D. B., Araujo H. X., Da Rocha F.

Przegląd Elektrotechniczny

2016

R. 92, nr 10

199--203

This paper presents a deconvolution based method that allows the improvement of the time response of a Swan-Ganz catheter. The goal of the deconvolution method is to obtain the input signal of an LTI system from the knowledge of its output and its impulse response. The noise causes degradation of the recovered signal, and this phenomenon is also discussed. The deconvolved signal is enriched in function of the cutoff frequency of the filter. It is shown that as the cutoff frequency increases, the deconvolved signal becomes more nosier. A Butterworth digital filter of third order, multiplied by the reverse impulse response was used in the frequency domain, and the response in frequency for the 1/H(s) function, limited for the various cutoff frequency of the filter are shown. It can be clearly observed that for higher cutoff frequency magnitude, the signal becomes completely distorted. Experiments with animals were used to measure the impulse response and the obtained results were satisfactory, with average error of 8.9%. The results suggest that the method can be useful in applications of linear systems.

Opisano metodę poprawy odpowiedzi czasowej cewnika typu Swan_ganz bazująca na rozplocie. Umożlia to ocenę sygnału wejściowego na podstawie odpowiedzi układu I znajomosci odpowiedzi impulsowej. . W pracy analizowano wpływ filtru cyfrowego na parametry sygnału. Metode z dobrym rezultatem przetestowano na zwierzętach.

Raman gain characterization in standard single mode optical fibres for optical simulation purposes

Andre P. S., Correia R., Borghesi L. M., Teixeira A. L. J., Nogueira R. N., Lima M. J. N., Kalinowski H. J., Da Rocha F., Pinto J. L.

Optica Applicata

2003

Vol. 33, nr 4

559-573

We report on the measurement of the Raman gain coefficient in a standard single mode optical fibre (SMF), based on the power transfer between a high intensity pump signal and a counter-propagated broadband probe signal technique. The results were complemented with spontaneous Raman spectroscopy. The values of 7.48×10–27 mW–1Hz–1, 0.540×10–13 mW–1, 3.03 fs, 12.40 fs, 40.78 fs and 0.160 were experimentally obtained for the Raman gain slope, maximum value of the gain coefficient, Raman time constant, first and second parameters of the Raman response function and fractional contribution of the delayed Raman response, respectively.