Feasibility of Remote Control and Development of Remote Control Devices and Sensors - 8 Volume Set. Volume 4 - Continuous Mining Machine Seam Interface Sensors.
Steinberg-RF; Ioannou-JT; Barkhoudarian-S
NTIS: PB/224-259 Available for Reference At Bureau Libraries :102 pages
This report presents the results of the study and experimentation on coal-seam interface sensing using the acoustic pulse-echo technique. The design and construction of acoustic transducers and coupling techniques are discussed and the electronic equipment used in conjunction with the transducers is described. Laboratory coal simulation experiments are described, and the results of acoustic transmission and reflection laboratory experiments, using coal samples from various sources, are presented. Because of difficulties encountered in laboratory experiments, an underground field test was performed for the purpose of evaluating the effectiveness of the technique for measuring coal thickness in situ prior to final hardware design and construction. The results of the field test, which showed that detection of the coal seam interface was difficult using state-of-the-art techniques because of competing signal returns, are discussed.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB/224-259; Available for Reference At Bureau Libraries