Nose conedevice and built-in calibration check as essenti al features of a standalone instrument for unattended mid- And long-term noise measurements
Mots-clés :
Acoustic fields, Acoustic measuring instruments, Calibration, Noise pollution, Aircraft noise, Built-in calibration, Construction sites, Environmental noise, Front-end design, Instruction manuals, Measurement points, Multiple source, Noise measurements, Normal modes, Random position, Recreational activities, Sound level meter, Stand-alone instrumentsRésumé
The article examines how the nose cone device and built-in calibration check are essential features of a stand alone instrument for unattended mid- and long-term noise measurements. Environmental noise generated by ground transportation, construction sites or recreational activities, is coming from all directions, and such multiple sources are usually located at random positions with respect to the measurement point. JEC 61672-1 gives directional response requirements for the configuration of a sound level meter as stated in the instruction manual for the normal mode of operation or for those components of a sound level meter that are intended to be located in a sound field. In unattended noise measurement situations, the direction from the source is generally unknown. Apart from aircraft noise, the sources are located on the ground. Taking into account the acoustic front end design at the early stage of the development allowed determining and optimizing the constraints: position of the microphone, shape of the body of the sound level meter, cone and wind screens characteristics.
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