masterThesis
Métodos de análise de sinais de ultra-som para caracterização de escoamentos bifásicos
Fecha
2009-11-16Registro en:
MASSIGNAN, João Paulo Druzina. Métodos de análise de sinais de ultra-som para caracterização de escoamentos bifásicos. 2009. 93 f. Dissertação (Mestrado em Engenharia Elétrica e Informática Industrial) – Universidade Tecnológica Federal do Paraná, Curitiba, 2009
Autor
Massignan, João Paulo Druzina
Resumen
This work presents a study of ultrasound signal parameters that are affected by two-phase flow water-air present in several industrial process. A pair of ultrasound transducers in transmissionreception mode has been installed in a 54 mm inner diameter plexiglass pipe. Velocity measurement is calculated by many methods and also energy and maximum amplitude analysis was applied. Additionally, it is proposed a broadband ultrasound attenuation (BUA) based method to measure the void fraction. BUA is a very common method used to diagnoses osteoporosis but underused in industry. Other method based on a signal normalization by the first valley is developed to avoid the use of a reference signal to calibrate the prototype. Theoretical methods and experimental results are described. The results were obtained in a two phase circuit situated in LABPETRO/UNICAMP. The hardware and software of acquisition system were developed in LASCA/UTFPR.