2014
DOI: 10.1175/jtech-d-13-00014.1
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Ranging through Shallow Semitransparent Media with Polarization Lidar

Abstract: A new approach to shallow depth measurement (,2 m) using polarization lidar is presented. The transmitter consists of a 532-nm linearly polarized laser coupled with conditioning and polarization optics. The prototype lidar evaluates the differing polarization attributes of signals scattered from semitransparent media surfaces, simultaneously receiving signals polarized in the planes parallel and perpendicular to the transmitted laser signal via dual photomultiplier tubes. In the event the first surface nearly … Show more

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Cited by 14 publications
(8 citation statements)
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“…In the last decade, researchers at the University of Colorado (CU) have developed and patented a novel bathymetric lidar technology and signal processing technique that exploits the polarization state of the reflected laser pulse to distinguish between returns from the water surface and from the bottom (Mitchell & Thayer, 2014;Mitchell, Thayer, & Hayman, 2010). Mitchell and Thayer (2014) demonstrated the potential to resolve extremely shallow depths (<10 cm) in a laboratory setting without relying upon a narrow laser pulse width or detector width. An exclusive license of lidar technology was established between CU and Atmospheric and Space Technology Research Associates Lidar Technologies (ASTRALiTe).…”
Section: Introductionmentioning
confidence: 99%
“…In the last decade, researchers at the University of Colorado (CU) have developed and patented a novel bathymetric lidar technology and signal processing technique that exploits the polarization state of the reflected laser pulse to distinguish between returns from the water surface and from the bottom (Mitchell & Thayer, 2014;Mitchell, Thayer, & Hayman, 2010). Mitchell and Thayer (2014) demonstrated the potential to resolve extremely shallow depths (<10 cm) in a laboratory setting without relying upon a narrow laser pulse width or detector width. An exclusive license of lidar technology was established between CU and Atmospheric and Space Technology Research Associates Lidar Technologies (ASTRALiTe).…”
Section: Introductionmentioning
confidence: 99%
“…Like most of the bathymetric laser sensors, the system utilizes a green laser (λ = 532 nm) and allows for the capture of river cross-sections constituting an appropriate input for 1D-HN models. The ASTRALiTe sensor is a scanning polarizing LiDAR [6]. The employed 30 mW laser only allows low flying altitudes and therefore provides limited areal measurement performance and the depth performance is moderate (1.2 -fold SD).…”
mentioning
confidence: 99%
“…ASTRALite edge™: This sensor features a weight of 5 kg and a PRR of 20 kH [41]. The manufacturer states a precision/accuracy of 5/10 mm and a depth penetration of >1.5 SD at a typical flying altitude for mapping bathymetry of 20 m. To overcome the known problem of separating signals from the surface and the bottom beneath, signal processing is based on a technique known as INtrapulse Phase Modification Induced by Scattering (INPHAMIS) considering the polarization of the returned laser pulses [6,42]. Show-cases of this sensor, which can be mounted on standard multi-copter UAV platforms like the DJI Matrice 600, are reported in [43][44][45].…”
mentioning
confidence: 99%
“…In contrast to typical lidar systems that consider only time-of-flight, the INPHAMIS technique also considers the polarization of the returned laser pulses. The technique is described in detail by Mitchell et al [43] and Mitchell and Thayer [44] and is only briefly summarized herein. When traveling from the air, across the air-water interface, and through water column to the bottom, the 532-nm laser pulse is scattered in planes both parallel and perpendicular to the transmitted signal.…”
Section: Bathymetric Lidar Acquisition and Processingmentioning
confidence: 99%