Review of snapshot spectral imaging technologies

Hagen, Nathan; Kudenov, Michael W.

doi:10.1117/1.oe.52.9.090901

Cited by 601 publications

(336 citation statements)

References 97 publications

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“…However, the dependence of the image-based temperature measurements on material properties, namely, emissivity, has raised some issues as regards the detailed study of all the phenomena that occur during the melting, evaporation, and solidification phases in laser welding. However, as it has been shown above, several publications have overcome this drawback, and lately, there is an upgraded interest of the researchers who seem to focus on creating and establishing industrial multi-spectral and multi-modal solutions [133,134]. The idea is that the device will be able to capture a wide range of infrared spectrum enabling the monitoring of different magnitudes in different spectral bands.…”

Section: Discussion and Future Outlookmentioning

confidence: 99%

Quality assessment in laser welding: a critical review

Stavridis

Papacharalampopoulos

Stavropoulos

2017

Int J Adv Manuf Technol

182

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Quality assessment methods and techniques for laser welding have been developed both in-and post-process. This paper summarizes and presents relevant studies being classified according to the technology implemented (vision, camera, acoustic emissions, ultrasonic testing (UT), eddy current technique (ECT)) for the quality inspection. Furthermore, the current review aims to map the existing modeling approaches used to correlating measured weld characteristics and defects with the process parameters. Research gaps and implications of the quality assessment in laser welding are also described, and a future outlook of the research in the particular field is provided.

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Section: Discussion and Future Outlookmentioning

confidence: 99%

Quality assessment in laser welding: a critical review

Stavridis

Papacharalampopoulos

Stavropoulos

2017

Int J Adv Manuf Technol

182

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“…Consequently, the throughputs of AOTF and LCTF are typically in the 40% [9] and 10% [25] range, respectively. This throughput is significantly lower than the 60-90% typically found in thin film band-pass filters [26], consequently limiting their use in low light applications [27].…”

Section: Introductionmentioning

confidence: 93%

High Throughput AOTF Hyperspectral Imager for Randomly Polarized Light

Abdlaty

Orepoulos²,

Sinclair³

et al. 2018

Photonics

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Abstract:The acousto-optic tunable filter (AOTF) is one of the most used techniques for hyperspectral imaging (HSI), and is capable of fast and random wavelength access, high diffraction efficiency, and good spectral resolution. Typical AOTF-HSI works with linearly polarized light; hence, its throughput is limited for randomly polarized applications such as fluorescence imaging. We report an AOTF-based imager design using both polarized components of the input light. The imager is designed to operate in the 450 to 800 nm region with resolutions in the range of 1.5-4 nm. The performance characterization results show that this design leads to 68% improvement in throughput for randomly polarized light. We also compared its performance against a liquid crystal tunable filter (LCTF)-based imager.

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“…The availability of new lightweight sensors (Aasen et al, 2015;Gupta et al, 2008;Hagen and Kudenov, 2013;Lapray et al, 2014) and the improvement of the autonomy of unmanned aerial vehicles (UAVs) have contributed for applications in forestry, agriculture, water and natural resources management (e.g., Goetz, 2009;Honkavaara et al, 2013). Research and monitoring activities have been benefited by the possibility of acquiring images with high spatial, temporal and spectral resolution, which enables more detailed studies based on image analysis.…”

Section: Introductionmentioning

confidence: 99%

Estimating Exterior Orientation Parameters of Hyperspectral Bands Based on Polynomial Models

Berveglieri¹,

Tommaselli²,

Honkavaara³

2017

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Hyperspectral camera operating in sequential acquisition mode produces spectral bands that are not recorded at the same instant, thus having different exterior orientation parameters (EOPs) for each band. The study presents experiments on bundle adjustment with time-dependent polynomial models for band orientation of hyperspectral cubes sequentially collected. The technique was applied to a Rikola camera model. The purpose was to investigate the behaviour of the estimated polynomial parameters and the feasibility of using a minimum of bands to estimate EOPs. Simulated and real data were produced for the analysis of parameters and accuracy in ground points. The tests considered conventional bundle adjustment and the polynomial models. The results showed that both techniques were comparable, indicating that the time-dependent polynomial model can be used to estimate the EOPs of all spectral bands, without requiring a bundle adjustment of each band. The accuracy of the block adjustment was analysed based on the discrepancy obtained from checkpoints. The root mean square error (RMSE) indicated an accuracy of 1 GSD in planimetry and 1.5 GSD in altimetry, when using a minimum of four bands per cube.

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Review of snapshot spectral imaging technologies

Cited by 601 publications

References 97 publications

Quality assessment in laser welding: a critical review

Quality assessment in laser welding: a critical review

High Throughput AOTF Hyperspectral Imager for Randomly Polarized Light

Estimating Exterior Orientation Parameters of Hyperspectral Bands Based on Polynomial Models

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