Abstract
We report on the development and characterization of a handheld terahertz (THz) time-domain spectroscopic scanner for broadband imaging between approximately 0.25 and 1.25 THz. We designed and fabricated a 3D-printed fiber-coupled housing which provides an alignment-free strategy for the placement and operation of the THz optics. Image formation is achieved through telecentric beam steering over a planar surface through a custom f-θ scanning lens. This design achieves a consistent resolution over the full 12 × 19 mm field of view. Broadband spectral imaging is demonstrated using a 1951 United States Air Force Resolution Test Target. The consistency of the resolution over the wide field is validated through Boehler Star resolution measurements. Finally, a practical scenario of subsurface imaging on a damaged section of an aircraft wing is demonstrated. The THz PHASR is a field-deployable imaging system with the versatility to be applied to a much broader range of targets and imaging scenarios than previously possible, from industrial non-destructive testing to clinical diagnostic imaging.
Highlights
T ECHNOLOGIES using terahertz (THz) frequency light have been adapted to a broad range of applications from security screening [1] and non-destructive testing [2]–[4] to biomedical analysis [5]–[7]
Many investigations use singlepixel techniques such as raster scanning the target in front of a stationary THz time-domain spectroscopy (THz-TDS) setup to form spectral images [8]–[11]
We present the THz Portable Handheld Spectral Reflection (PHASR) scanner: a Portable HAndheld Spectral Reflection scanner, which can record 2D THz-TDS images at 100 traces/s without phase ambiguity using a mirror mounted in a 2-axis motorized gimbal and a custom f-θ focusing lens
Summary
T ECHNOLOGIES using terahertz (THz) frequency light have been adapted to a broad range of applications from security screening [1] and non-destructive testing [2]–[4] to biomedical analysis [5]–[7]. Many investigations use singlepixel techniques such as raster scanning the target in front of a stationary THz time-domain spectroscopy (THz-TDS) setup to form spectral images [8]–[11]. Telecentric beam steering is ideal for a handheld scanner because the scanning mechanism consists of a single mirror mounted in a commercially available gimbal, which is small in size and does not require complicated meta-surface design considerations. This arrangement provides accurate 2D scanning, which can be integrated into a self-contained device.
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