Film-recording noise dosimeter

Details Film-recording noise dosimeter Film-recording noise dosimeter

1976-05-10

1977-06-14

Swisher, S. Clement

Measuring and testing

Speed, velocity, or acceleration

Centrifugal weight type

73 713, 179 1N, G01H 312

Patent

active

040289478

ABSTRACT:
A noise dosimeter permanently records ambient noise levels over a period of ime on photographic film to provide an indication proportional to the overall sound exposure level. Impinging acoustic energy is converted to representative potentials which are transformed into representative currents. These currents drive at least one light emitting diode which irradiates an area on an unexposed photographic film. The net degree of exposure over a period of time is read out or interpreted by a densitometer. The reading, proportional to sound exposure level, provides a record from which engineers, technicians, etc. can take the proper remedial action to avoid otherwise hazardous or detectable noise levels.

REFERENCES:
patent: 3543229 (1970-11-01), Baum
patent: 3778552 (1973-12-01), Edinborgh
patent: 3802535 (1974-04-01), Peake et al.
patent: 3828356 (1974-08-01), Wiers
patent: 3892133 (1975-07-01), Quinn

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