40 Instrumentation Kiyoshi Nagakura

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Railway Technical Research Institute

40.1 Sound Intensity Measurement ........................................... 40-1

Theoretical Background † Measurement Method † Errors in

Measurement of Sound Intensity † Applications

40.2 Mirror – Microphone System .............................................. 40-4

Principle of Measurement † Applications

40.3 Microphone Array .............................................................. 40-6

Principle of Microphone Array † Array’s Directivity

Pattern † Applications

Summary

This chapter describes some measuring methods for the identification and ranking of noise source that are of

benefit in noise control projects. Sound intensity measurement and directional measuring devices such as the

mirror– microphone system and microphone array are introduced and their principles and applications are

described.

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