Development of a Digital Frequency Meter for signal analysis on a Respiratory Physiotherapy Equipment
Guilherme Carvalho da Silva1; Raissa Moraes de Castro1; Marcus Davi do Nascimento Forte1; Fabrício Gonzalez Nogueira1; Bismark Claude Torrico1; Denise Maria Sá Machado Diniz2; Mylena Ximenes Aguiar2; Nathiara Ellen dos Santos2; Thiago Diniz Lobo1
1 Universidade Federal do Ceará; 2 Universidade Estácio do Ceará
Baixar PDF doi:10.20906/CPS/CBA2018-1436
Resumo
This work presents preliminary results of a digital frequency meter that has been designed to measure the frequency of oscillatory vibrations in respiratory physiotherapy devices. Maintain a frequency around 13Hz is important to keep an efficient treatment. Therefore, the proposed circuits and systems are intended to give a visual feedback to the patient with a suggestion of the optimal blow strength. A Linear Hall-Effect Sensor was coupled to the physiotherapy device and the output signal is conditioned through a set of filters. The Fast Fourier Transform of the conditioned signal is used in order to extract frequency domain information to be displayed in real-time to patients.
Palavras-chave: HFOO; Physical Therapy Modalities; Linear Hall-Effect Sensor; Filter; FFT