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Browse Prior Art Database

Probe Microphone

IP.com Disclosure Number: IPCOM000098754D
Original Publication Date: 1959-Dec-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Becker, ECH: AUTHOR

Abstract

A pressure sensitive microphone 10 is encased in an approximately 0.5 inch thick steel shell 11 which is surrounded by a layer of kapok 12 enclosed by an outer steel casing 13. A sectional probe tube 14 has a first section 15 disposed in close proximity to the microphone 10 and fixed to extend away from 10 through the steel shell 11 into a flexible coupling 16. A second section 17 is fixed to extend from the flexible coupling 16 through the outer casing 13 into a flexible coupling 18. An external section 19 of desired length is joined by the coupling 18.

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Probe Microphone

A pressure sensitive microphone 10 is encased in an approximately 0.5 inch thick steel shell 11 which is surrounded by a layer of kapok 12 enclosed by an outer steel casing 13. A sectional probe tube 14 has a first section 15 disposed in close proximity to the microphone 10 and fixed to extend away from 10 through the steel shell 11 into a flexible coupling 16. A second section 17 is fixed to extend from the flexible coupling 16 through the outer casing 13 into a flexible coupling 18. An external section 19 of desired length is joined by the coupling
18.

By this arrangement, the sound pressure at the microphone is determined by the external sound pressure at the exposed end of the external section 19 which is located at the desired position. Encasing the microphone 10 attenuates other external sound pressure by 20 to 30 decibels.

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