Měřící systém pro měření a vyhodnocení akustického signálu

Abstract

Target of this diploma thesis was to design and develop the test system for measurement and evaluation of acoustic signal inside of the EMC chamber. The purpose is to monitor functionality of the headlamp during testing. Main purpose of the software is to monitor the stepper motor headlamp leveller. In introduction part of this work basic principles of EMC measurement are described. Recherche about acoustic signal, methods of detection of acoustic pressure and selection of appropriate components of resulting system follows. The whole system composes of optical microphone FOMIC-SM 2140, data acquisition device USB-6210 and software developed in LabVIEW. Resulting system is able to monitor the stepper motor during continuous movement and so called off-mode, when the motor shall not move.