INSTRUMENTATION FOR MEASURING AIRCRAFT NOISE AND SONIC BOOM
Improved instrumentation suitable for measuring aircraft noise and sonic booms is described. An electric current proportional to the sound pressure level at a condenser microphone is produced and transmitted over a cable and amplified by a zero drive amplifier. The converter consists of a local oscillator, a dual-gate field-effect transistor mixer, and a voltage regulator/impedance translator. The improvements include automatic tuning compensation against changes in static microphone capacitance and means for providing a remote electrical calibration capability.
- Misc-Filed 1 Jul. 1975 Supersedes N75-27334 (13 - 18, p 2249). Subm-Sponsored by NASA. This Government-owned invention available for U.S. licensing and, possibly, for foreign licensing. Copy of Patent available Commissioner of Patents, Washington, D.C.
Langley Research CenterNational Aeronautics and Space Administration
Hampton, VA USA 23665
- Zuckerwar, A J
- Publication Date: 1976-6-22
- Pagination: 8 p.
- TRT Terms: Acoustic measuring instruments; Acoustics; Aircraft noise; Calibration; Converters (Electricity); Electric current; Patents; Sonic boom; Transistors
- Old TRIS Terms: Acoustic measurement; Acoustic measurements; Converters; Field effect transistors
- Subject Areas: Aviation; Environment;
- Accession Number: 00145823
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: PATENT-3 964 319, PAT-APPL-592 159
- Files: TRIS
- Created Date: Jan 16 1977 12:00AM