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Rozróżnianie wybranych obiektów na podstawie estymacji kąta azymutu przylotu echa sygnału ultradźwiękowego

Kreczmer B.

Prace Naukowe Politechniki Warszawskiej. Elektronika

2018

z. 196

501--510

W niniejszej pracy zaproponowano nowe kryteria rozróżniania struktur takich jak ściana, krawędź oraz kąt pomieszczenia. Wykorzystują one nową konstrukcję sonarów ultradźwiękowych. Kryteria te pozwalają zwiększyć odstęp od wartości błędu pomiaru. Tym samym niemal czterokrotnie zwiększają obszar poprawnego rozróżniania wspomnianych struktur. Istotną zaletą metody jest to, że jej implementacja może zostać obecnie zrealizowana przy użyciu sonarów o relatywnie prostej konstrukcji.

In this paper, new criteria were proposed for differentiating objects form walls, edges and corners. They are based on a new construction of ultrasonic sonar which makes it possible to enlarge ratio of a criterion values to error measurements. In this way, an area of correct object differentiation was enlarged almost four times. A very important advantage of this method is that its application can be done by using sonars having a simple construction. In spite of its simplicity, these sonars deliver data which allow accurate estimation of echo arrival direction to be obtained. To prove correctness of the method, results of preliminary experiments were presented.

The influence of ultrasound signal parameters on sonoluminescence light intensity

Szmechta M., Boczar T., Zmarzły D.

Archives of Electrical Engineering

2013

Vol. 62, nr 4

605--612

Topics of this article concern the study of the fundamental nature of the sonoluminescence phenomenon occurring in liquids. At the Institute of Electrical Power Engineering at Opole University of Technology the interest in that phenomenon known as secondary phenomenon of cavitation caused by ultrasound became the genesis of a research project concerning acoustic cavitation in mineral insulation oils in which a number of additional experiments performed in the laboratory aimed to determine the influence of a number of acoustic parameters on the process of the studied phenomenona. The main purpose of scientific research subject undertaken was to determine the relationship between the generation of partial discharges in high-voltage power transformer insulation systems, the issue of gas bubbles in transformer oils and the generated acoustic emission signals. It should be noted that currently in the standard approach, the phenomenon of generation of acoustic waves accompanying the occurrence of partial discharges is generally treated as a secondary phenomenon, but it can also be a source of many other related phenomena. Based on our review of the literature data on those referred subjects taken, it must be noted, that this problem has not been clearly resolved, and the description of the relationship between these phenomena is still an open question. This study doesn’t prove all in line with the objective of the study, but can be an inspiration for new research project in the future in this topic. Solution of this problem could be a step forward in the diagnostics of insulation systems for electrical Power devices based on non-invasive acoustic emission method.