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.

• Supplemental Notes:
  • 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.
• Corporate Authors:

  Langley Research Center

  National Aeronautics and Space Administration
  Hampton, VA  United States  23665
• Authors:
  • Zuckerwar, A J
• Publication Date: 1976-6-22

Media Info

• Pagination: 8 p.

Subject/Index Terms

• TRT Terms: Acoustic measuring instruments; Acoustics; Aircraft noise; Calibration; Electric current; Patents; Power converters; Sonic boom; Transistors
• Old TRIS Terms: Acoustic measurement; Acoustic measurements; Converters; Field effect transistors
• Subject Areas: Aviation; Environment;

Filing Info

• 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