In this section. we discuss the experimental set-up to address our problems on estimating distances to the source of an explosion events, and estimating intensity of the explosion. First, we briefly discuss the testing facility. followed by discussions on selecting smartphones for our experiments
A. Experimental set-up
The Explosives Research Lab (ERL) at Missouri S&T is a unique facility where students are taught fundamental concepts in Explosives Engineering using practical demonstrations The blasting is actually done in an underground experimental limestone mine that serves as a facility for student training on explosions. mine constructions. operations. safety and rescue. Figure depicts the mine environment. In May 2014, we participated in several blasting experiments conducted at ERL Table I presents the parameters of all experiments in which we collected data. As we can see there were a total of experiments (denoted by EI, E2, E3 and E4), each on multiple days. Each explosion is actually composed of multiple blasts, with each blast lasting for about 250ms with a typical one second delay between two blasts. The explosive material used for each explosion Dynamite (Unimax TT) with Ammonium Nitrate Fuel Oil (ANFO). In each experiment. a different charge-weight (in lb) was used for the ANFO material. which determines the intensity of explosion. Details of the explosive material are presented in Table IT