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Multiple-channel trigger circuit for noise discrimination in ultrasonic acoustic emission studies.

Authors
Hanson-DR
Source
Denver, CO: U.S. Department of the Interior, Bureau of Mines, IC 9425, 1995 Jan; :1-18
Link
NIOSHTIC No.
20039216
Abstract
Transient electrical noise events pose serious problems for data aquisition systems monitoring acoustic emissions in laboratory and field environments. The U.S. Bureau of Mines, as part of a study aimed at using ultrasonic acoustic emissions to warn of impending structural failure and stress transfers in underground coal mines, has designed and constructed a trigger discriminator circuit for use in ultrasonic acoustic emission (UAE) studies. Desgined for use with signals in the frequency range of 50 kHz to 400 kHz, the instrument examines incoming signals for frequency content, amplitude, simultaneity, threshold crossings, and number of channels above threshold. The system was designed for four input channels, but may be expanded to more channels with minimal design changes.
Keywords
Coal-mining; Wave-propagation; Noise-threshold; Amplitude; Channels; Acoustic-detection; Trigger-circuits; Electromagnetic-noise; Discrimination; Acoustic-signals; Ultrasonic-frequencies
Publication Date
19950101
Document Type
Information Circular
Fiscal Year
1995
NTIS Accession No.
PB95-220158
NTIS Price
A03
Identifying No.
IC-9425
NIOSH Division
DRC
Source Name
Denver, CO: U.S. Department of the Interior, Bureau of Mines, IC 9425
State
CO
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