Loose rock can be detected by infrared devices.
Min Eng 1970 Nov; 22(11):59-62
This article summarizes the use of infrared techniques to detect loose rock around underground mine openings. Research to date shows that when differences of about 0.5 Deg. C or more exist between the air and rock temperatures in underground openings the loose rock will have a different temperature than the solid rock. The results obtained in several mines are discussed.
Mining; Underground mines; Air temperature; Rock mechanics; Temperature effects
OP; Journal Article