Accession Number:

ADB019314

Title:

Acoustic Recession Gage Development

Descriptive Note:

Final rept. 30 Jun 1975-30 Nov 1976

Corporate Author:

ACUREX CORP/AEROTHERM MOUNTAIN VIEW CA

Personal Author(s):

• Vindum, J. O.
• Eichorn, R. L.
• Foster, T. F.
• Kelly, J. T.
• Muller, T. K.

Report Date:

1977-01-20

Pagination or Media Count:

252.0

Abstract:

Resonant Acoustic Measurement Gages have been developed under SAMSO Contract F04701-75-C-0164. These gages were designed to determine the recession and shape of ablating reentry vehicle nosetips. A single-mode gage is used to determine recession only and a dual-mode gage was built to measure both recession and shape. Details of the gage configurations, electronics, and associated tests are described. The tests include bench tests, 1 MW and 50 MW arc jet ablation tests. Also included are details of the acoustical analysis performed using several computer codes. The main feature of the Resonant Acoustic Measurement Gage is that the object which is to be measured is acoustically excited at its resonant frequency or frequencies. It is from these frequencies that nosetip length shape can be obtained. Because of reduced funding levels in the instrumentation area, this program was temporarily halted. This report describes the status of the gages at the time the contract was halted.

Descriptors:

• *ACOUSTIC DETECTORS
• *NOSE TIPS
• ABLATION
• ACOUSTIC RESONANCE
• ALUMINUM
• DUAL MODE
• GAGES
• MODEL TESTS
• PIEZOELECTRIC GAGES

Subject Categories:

• Test Facilities, Equipment and Methods
• Guided Missile Reentry Vehicles
• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE