title: Application of Micro-Electro-Mechanical Sensors Contactless NDT of Concrete Structures.
abstract: The utility of micro-electro-mechanical sensors (MEMS) for application in air-coupled (contactless or noncontact) sensing to concrete nondestructive testing (NDT) is studied in this paper. The fundamental operation and characteristics of MEMS are first described. Then application of MEMS sensors toward established concrete test methods, including vibration resonance, impact-echo, ultrasonic surface wave, and multi-channel analysis of surface waves (MASW), is demonstrated. In each test application, the performance of MEMS is compared with conventional contactless and contact sensing technology. Favorable performance of the MEMS sensors demonstrates the potential of the technology for applied contactless NDT efforts.
  
  
  OBJECTIVE
  To illustrate the utility of air-coupled MEMS sensors for concrete NDT, as compared with conventional sensor technology.
authors.affiliation: Department of Civil and Environmental Engineering, The University of Illinois at Urbana-Champaign, 205 N. Mathews Ave, MC-250, Urbana, IL 61801, USA. coast98@gmail.com.
authors.forename: Suyun
authors.initials: S
authors.lastname: Ham
authors.affiliation: Department of Civil and Environmental Engineering, The University of Illinois at Urbana-Champaign, 205 N. Mathews Ave, MC-250, Urbana, IL 61801, USA. johnpop@illinois.edu.
authors.forename: John S
authors.initials: JS
authors.lastname: Popovics