AN INCREMENTAL HYDROBAROPHONE
Abstract
A Wien bridge-type hydrobarophone capable of measuring incremental pressure fluctuations as low as 0.10 in. of water in the presence of a static head as high as 300 ft of water is de scribed. A frequency response of 0-200 cps is attainable. Special features include: (1) an incremental pressure sensitivity independent of static head. This is accomplished by pressure equalization through a system of an air pressure bag and valves; (2) an acoustic filter inserted between the pressure equalization system and the active portion of the hydrobarophone permits pass band operation. The low frequency end of the band can be easily adjusted for any desired period less than an hour; (3) enclosure of the hydrobarophone in a fiberglass container for shielding it from undesirable temperature changes; and (4) an attached temperature indicator, instrumental in obtaining an accurate hydrobarophone.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 27, 1963
- Accession Number
- AD0407583
Entities
People
- Charles H. Marshall
- Edward L. Peters
Organizations
- Naval Ordnance Laboratory