3.5 DOSIMETER

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The dosimeter or noise-exposure meter is an instrument developed for measurement

of the accumulated noise exposure of workers in an industrial

environment. The dosimeter, shown in Fig. 3-8, is an integrating sound

level meter system that can be carried by workers during their normal course

of work. Some units have separate storage registers to allow the unit to be

used to monitor several workers before downloading the data.

The output of a typical dosimeter includes the total noise exposure, in

units of dBA, the percent of allowable noise dosage, and the peak (maximum)

noise exposure level. In addition, such information as date, time, and

duration of the data acquisition period may be included in the output. At

50 Chapter 3

TABLE 3-1 Standard 1/3 Octave Band Center Frequencies

Band

No.

Center

frequency, Hz

Band

No.

Center

frequency, Hz

Band

No.

Center

frequency, Hz

12 16 23 200 34 2,500

13 20 24 250 35 3,150

14 25 25 315 36 4,000

15 31.5 26 400 37 5,000

16 40 27 500 38 6,300

17 50 28 630 39 8,000

18 63 29 800 40 10,000

19 80 30 1,000 41 12,500

20 100 31 1,250 42 16,000

21 125 32 1,600 43 20,000

22 160 33 2,000

Copyright © 2003 Marcel Dekker, Inc.

the end of the day, the data may be downloaded for permanent storage on a

disk and for export to spreadsheet software for graphing and reporting

purposes.

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