NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Sound-burst Generator for Measuring Coal PropertiesAcoustical properties of coal can be measured accurately and with relative ease with aid of digital two-channel sine-wave sound generator. Generator is expected to provide information for development of acoustic devices for measuring thickness of coal in longwall mining. In echo-cancellation measurements, sound bursts are sent to coal sample from opposite directions. Transmitted and reflected amplitudes and phases are measured by transducers to determine coal properties.
Document ID
19810000281
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Hadden, W. J. J.
(Georgia Institute of Technology)
Mills, J. M.
(Georgia Institute of Technology)
Pierce, A. D.
(Georgia Institute of Technology)
Date Acquired
August 11, 2013
Publication Date
December 1, 1982
Publication Information
Publication: NASA Tech Briefs
Volume: 6
Issue: 3
ISSN: 0145-319X
Subject Category
Materials
Report/Patent Number
MFS-25438
Accession Number
81B10281
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

There are no available downloads for this record.
No Preview Available