We just published a paper in International Journal of Rock Mechanics and Mining Science on relative calibration of acoustic emission sensors using ultrasonic pulses: “An improved method for seismic moment tensor inversion of acoustic emissions through assessment of sensor coupling and sensitivity to incidence angle“.
Reference:
Kwiatek, G., Charalampidou, E.-M., Dresen, G., and S. Stanchits (2013). An improved method for seismic moment tensor inversion of acoustic emissions through assessment of sensor coupling and sensitivity to incidence angle. Int. J. Rock Mech. Min. Sci. DOI: 10.1016/j.ijrmms.2013.11.005 [ Article Page ].