During the ageing of in-service medium voltage equipment, electrical losses are mainly due to partial discharges. These partial discharges can lead to the electrical failure of industrial equipment [1]. Partial discharges include (i) bulk discharges occurring in insulating material voids, (ii) corona discharges affecting or not the insulator and (iii) surface discharges developing on an insulat...

chalcogramma) stocks in the Bering Sea and Gulf of Alaska since 1979. As fisheries acoustic methodology has matured, acoustic research at the APSC has involved refinements in equipment and techniques. Whereas early echosounders and echo integrators were subject to the drifts associated with the use of analogue electronic circuitry and were limited by system dynamic range, modern units utilized ...

Many documents describe standardized methods and standard equipment requirements in the field of audiology and hearing aids. These standards will ensure a uniform level and a high quality of both the methods and equipment used in audiological work. The standards create the basis for measuring performance in a reproducible manner and independent from how and when and by whom parameters have been...

In this paper we present experimental results on propagation, coherence, and time delay estimation (TDE) in an acoustic microphone array. The primary goal is to understand the achievable accuracy of acoustic TDE using low-cost, commercial off the shelf (COTS) speakers and microphones. In addition, the experiment seeks to provide an empirical understanding of the effects of center frequency, ban...

The European regulation regarding pressure equipment (i.e. Pressure Equipment Directive PED 97/23/CE) is applicable since May 2002. The member states have since adopted regulations enabling the use of innovative NDE methods such as acoustic emission as a global method associated to a local method such as TOFD technique which permits an accurate characterization and precise sizing of flaw indica...

MEASURING THE LINEAR AND NONLINEAR PROPERTIES OF ELECTRO-ACOUSTIC TRANSMISSION SYSTEMS F. Heinle, R. Rabenstein, and A. Stenger Lehrstuhl f ur Nachrichtentechnik, Universit at Erlangen-N urnberg frabe,[email protected] ABSTRACT Competitive audio consumer products require not only cheap signal processing hardware but also low-cost analog equipment and sound transducers. Th...

Over the last ten years, the high-resolution marine geophysical survey field has witnessed significant advances in survey investigation equipment. New equipment is based on acoustic, optical, electrical, and magnetic sensors. This paper will focus on the use of quantitative acoustic methods for the high-resolution mapping of the seafloor for archaeological heritage management. In particular mul...