Feasibility study of the transient electromagnetic method for chamber blasting misfire detection and recognition

In this paper, transient electromagnetic method was used to carry out the feasibility study on the de- tection and recognition of chamber blasting misfire. Firstly, an electromagnetic background field was estab- lished in the test; secondly, a benign conductor was preset in the chamber, and then the background field was eliminated after the electromagnetic field was measured; thirdly, the transient electromagnetic field was mea- sured again after blasting; at last, the chamber blasting misfire was detected and recognized by comparing the change of eddy current field of the preset benign conductor before and after blasting. The test results showed that： When the buried depth of aluminum box target was no more than 30 m, transient electromagnetic method can clearly identify the position of the aluminum box; when the buried depth of aluminum box was more than 30 m, the buried depth and position of the aluminum box was not sure due to the unknown level of secondary eddy current field generated by aluminum box