Challenges and solutions for high performance SWIR lens design

Gardner, MC; Rogers, Philip J.; Wilde, Mike; Cook, Tiffany; Shipton, A.

doi:10.1117/12.2241089

Cited by 3 publications

(1 citation statement)

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“…Since the two cameras are not completely identical in their properties and for the stringent allocation of the wavelengths during the measurement, each of the two cameras is allocated to a spectral range and named after it for better differentiation. The NIR Due to a further etching step during production, the indium phosphor (InP) passivation layer on top of the InGaAs layer is thinned out, so that also visible photons can pass through [42][43][44]. Due to the small bandgap of InGaAs, electrons can pass more easily from the valence band into the conduction band by thermal excitation, which leads to an increased intrinsic dark current compared to their silicon counterparts [42,45].…”

Section: Hardware Designmentioning

confidence: 99%

Development of a VNIR/SWIR Multispectral Imaging System for Vegetation Monitoring with Unmanned Aerial Vehicles

Alexander

Bareth

Bolten

et al. 2019

Sensors

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Short-wave infrared (SWIR) imaging systems with unmanned aerial vehicles (UAVs) are rarely used for remote sensing applications, like for vegetation monitoring. The reasons are that in the past, sensor systems covering the SWIR range were too expensive, too heavy, or not performing well enough, as, in contrast, it is the case in the visible and near-infrared range (VNIR). Therefore, our main objective is the development of a novel modular two-channel multispectral imaging system with a broad spectral sensitivity from the visible to the short-wave infrared spectrum (approx. 400 nm to 1700 nm) that is compact, lightweight and energy-efficient enough for UAV-based remote sensing applications. Various established vegetation indices (VIs) for mapping vegetation traits can then be set up by selecting any suitable filter combination. The study describes the selection of the individual components, starting with suitable camera modules, the optical as well as the control and storage parts. Special bandpass filters are used to select the desired wavelengths to be captured. A unique flange system has been developed, which also allows the filters to be interchanged quickly in order to adapt the system to a new application in a short time. The characterization of the system was performed in the laboratory with an integrating sphere and a climatic chamber. Finally, the integration of the novel modular VNIR/SWIR imaging system into a UAV and a subsequent first outdoor test flight, in which the functionality was tested, are described.

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Section: Hardware Designmentioning

confidence: 99%