Accession Number : ADD004211

Title :   Film-Recording Noise Dosimeter.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Cowen,Steven J

Report Date : 14 Jun 1977

Pagination or Media Count : 14

Abstract : A noise dosimeter permanently records ambient noise levels over a period of time 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. (Author)

Descriptors :   *Patents, *Photographic recording systems, *Noise(Sound), *Measuring instruments, Photographic film, Light emitting diodes, Densitometers, Ambient noise, Noise pollution

Subject Categories : Test Facilities, Equipment and Methods
      Recording and Playback Devices
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE