SPIE Proceedings [SPIE SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring - San Diego, California, USA (Sunday 9 March 2014)] Smart Sensor Phenomena, Technology, Networks, and Systems Integration 2014 - A qualitative and quantitative investigation of the uncracked and cracked condition of concrete beams using impulse excitation, acoustic emission, and ultrasonic pulse velocity techniques