Mechanical Properties of Bump-Prone Coal with Different Porosities and Its Acoustic Emission-Charge Induction Characteristics under Uniaxial Compression

Figure 4

System for testing. (a) Instruments of the testing system. (b) Basic sketch of charge preamplifier. (c) Structural diagram of the shield cylinder. The location of the AE transducers and charge preamplifier is shown, but the number of sensors is not limited.

(a)

(b)

(c)