Terahertz Spectroscopy and Brewster Angle Reflection Imaging of Acoustic Tiles

Figure 5

Sample tile “A1-8” positioned ready for scanning. The two black cylinders on the left and right are the Teflon-collimating lens enclosures of the THz emitter and detector, respectively. The path of the THz beam is highlighted in blue. Upon exiting the transmitter the THz radiation is linearly polarized horizontally across the optical table. The rectangular tile sample is positioned on top of a precision lab jack and two X-Y positioning stages. Oval inset: an edge closeup of the three-layered tile sample. The dashed horizontal line indicates the target depth of the reflection imaging at the first rubber-rubber interface.