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UTVECKLING AV EN KONDENSATORMIKROFON
Örebro University, Department of Technology.
Örebro University, Department of Technology.
2009 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
DEVELOPMENT OF A CONDENSER MICROPHONE (English)
Abstract [sv]

Detta examensarbete har utförts på Örebro universitet och Västerdalarnas Mekaniska Industri AB (VMI) i Malung för Ehrlund Microphones.Ehrlund Microphones tillverkar mikrofoner med sin patenterade kapsel, som bland annat består utav ett triangulärt membran.

Under examensarbetets tid var en ny mikrofonmodell under utveckling. Målet med examensarbetet var att bistå Ehrlund Microphones med utförandet av tester och mätningar, samt att komma med förslag till förbättringar på den nya konstruktionen.

På VMI i Malung, där kapslarna tillverkas, finns ett mätlabb som är till för att mäta kapslarnas frekvenssvar. Mätutrustningen i detta labb har installerats och konfigurerats för den mätmetod som har tagits fram för att verifiera kapslarnas frekvensgång.

Slutsatsen av undersökningen huruvida skyddsgallret påverkar mikrofonens frekvensgång, är att den volym luft som ryms innanför skyddsgallret har större betydelse för frekvensgången än vad den geometriska utformningen av gallret har.

Med stor sannolikhet kommer den nya transistorbaserade mikrofonmodellen att ha ett bättre signal/brus-förhållande än vad som visas i detta arbete, eftersom testerna har utförts på en prototyp i utvecklingsskedet.

Abstract [en]

This degree thesis has been conducted at the University of Örebro and Västerdalarnas Mekaniska Industri AB (VMI) in Malung on behalf of Ehrlund Microphones. Ehrlund Microphones produce microphones with their patented capsule, containing a triangular membrane.During the course of this thesis, a new microphone model was under construction. The aim was to assist Ehrlund Microphones conducting tests, measurements and also coming up with ideas of how to improve the construction of the new microphone model.

At VMI, where the capsules are produced, there is a lab designed to measure the frequency response of the capsules. The equipment in this lab has been installed and configured for the measurement method used, to verify the frequency response of the capsules.

The conclusion of the examination whether the grille of the microphone influence the frequency response of the microphone in a noticeable way, is that the volume of air enclosed by the grille has greater influence on the frequency response than the shape of the grille.

It’s most likely that the new transistor based microphone model will have an improved signal/noise-ratio, considering that the tests conducted in this essay were made on a prototype under development.

Place, publisher, year, edition, pages
2009. , 45 p.
Series
Örebro Studies in Technology, ISSN 1650-8580
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:oru:diva-8337ISRN: ORU-NAT/ELE-GK-2010/1--SEOAI: oai:DiVA.org:oru-8337DiVA: diva2:273647
Presentation
2008-06-04, T133, Örebro universitet 701 82, ÖREBRO, 08:00 (Swedish)
Uppsok
Technology
Supervisors
Examiners
Available from: 2010-03-29 Created: 2009-10-22 Last updated: 2010-03-29Bibliographically approved

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