Transcription of 6 SOUND MEASURING INSTRUMENTS - WHO
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6 SOUND MEASURING INSTRUMENTS - WHO
Figure SOUND level meter block diagram6 SOUND MEASURING INSTRUMENTSP rofessor J. MalchaireUnit Hygi ne et Physiologie du TravailUniversit Catholique de Louvain (UCL)Clos Chapelle-aux-Champs 3038B-1200 INTRODUCTIONThis chapter describes the noise MEASURING INSTRUMENTS most widely used in the practice ofoccupational hygiene. The planning, the strategy and the practical aspects of a noise survey arediscussed in Chapter types of MEASURING systems can be used for the measurement of SOUND depending onthe purpose of the study, the characteristics of SOUND and the extent of information that is desiredabout the SOUND .
128 Sound measuring instruments The numbers on the curves represent the angle of incidence (in degrees) of the incoming sound wave with respect to the normal to the membrane. The quantity, “R”, represents the response to a diffuse sound field (sound incident equally from all possible directions).
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