  In recent years, augmented reality (AR) technology has been increasingly
employed in structural health monitoring (SHM). In the case of conditions
following a seismic event, inspections are conducted to evaluate the
progression of the damage pattern quantitatively and efficiently respond if the
displacement pattern is determined to be unsafe. Additionally, quantification
of nearby structural changes over short-term and long-term periods can provide
building inspectors with information to improve safety. This paper proposes the
Time Machine Measure (TMM) application on an Augmented Reality (AR)
Head-Mounted-Device (HMD) platform. The main function of the TMM application is
to restore the saved meshes of a past environment and overlay them onto the
real environment so that inspectors can intuitively measure structural
deformation and other movement across time. The proposed TMM application was
verified by experiments meant to simulate a real-world inspection.
