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 . The various elements in a MEASURING system are:a. the transducer; that is, the microphone;b. the electronic amplifier and calibrated attenuator for gain control;c. the frequency weighting or analyzing possibilities;d.
In a piezoelectric microphone, the membrane is attached to a piezoelectric crystal which ... the wider the frequency range and the lesser the effects of directivity since they occur at higher frequencies. Microphones of small diameter would then be preferable. However, they are more fragile and, with the exception of certain special ones, less ...
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