Hyperspectral Imaging: Wide‐Area Spectrophotometry Using a Liquid‐Crystal Tunable Filter

1999 ◽  
Vol 111 (759) ◽  
pp. 621-626 ◽  
Author(s):  
 Robert W. Slawson ◽  
Zoran Ninkov ◽  
Elliott P. Horch
Keyword(s):  
Liquid Crystal ◽  
Hyperspectral Imaging ◽  
Tunable Filter ◽  
Wide Area

scholarly journals A new technique of full polarization hyperspectral imaging based on acousto-optic tunable filter and liquid crystal variable retarder

2015 ◽  
Vol 64 (14) ◽  
pp. 140702
Author(s):  
Li Ke-Wu ◽  
Wang Zhi-Bin ◽  
Yang Chang-Qing ◽  
Zhang Rui ◽  
Wang Yao-Li ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Hyperspectral Imaging ◽  
Tunable Filter ◽  
New Technique ◽  
A New Technique

Validity of retinal oxygen saturation analysis: Hyperspectral imaging in visible wavelength with fundus camera and liquid crystal wavelength tunable filter

2007 ◽  
Vol 14 (3) ◽  
pp. 151-158 ◽  
Author(s):  
Yoko Hirohara ◽  
Yoshitaka OKawa ◽  
Toshifumi Mihashi ◽  
Tatsuo Yamaguchi ◽  
Naoki Nakazawa ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Oxygen Saturation ◽  
Hyperspectral Imaging ◽  
Tunable Filter ◽  
Fundus Camera ◽  
Visible Wavelength ◽  
Wavelength Tunable

scholarly journals Hyperspectral Fluorescence LIDAR Based on a Liquid Crystal Tunable Filter for Marine Environment Monitoring

Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 410
Author(s):  
Eleonora Aruffo ◽  
Andrea Chiuri ◽  
Federico Angelini ◽  
Florinda Artuso ◽  
Dario Cataldi ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Marine Environment ◽  
Detection System ◽  
Tunable Filter ◽  
Spectral Interval ◽  
Environment Monitoring ◽  
Research Activities ◽  
Custom Made ◽  
New Instrument ◽  
Marine Environment Monitoring

An innovative hyperspectral LIDAR instrument has been developed for applications in marine environment monitoring research activities, remotely detecting the fluorescence spectra produced in the spectral interval between 400 nm and 720 nm. The detection system is composed by a custom made photomultiplier charge integrating and measuring (CIM) unit, which makes automatic background signal subtraction, and a liquid crystal tunable filter (LCTF). The new instrument therefore has hyperspectral resolution and allows automatic background subtraction; it is compact and automated by custom software that permit to adapt the instrument properties depending on the environmental conditions. Laboratory tests to characterize the instrument performance have been carried out, concluding that this sensor can be employed in remote sites for Chl-a detection.

scholarly journals Compressive Sensing Hyperspectral Imaging by Spectral Multiplexing with Liquid Crystal

2018 ◽  
Vol 5 (1) ◽  
pp. 3 ◽  
Author(s):  
Yaniv Oiknine ◽  
Isaac August ◽  
Vladimir Farber ◽  
Daniel Gedalin ◽  
Adrian Stern
Keyword(s):  
Liquid Crystal ◽  
Compressive Sensing ◽  
Hyperspectral Imaging ◽  
Spectral Properties ◽  
Sensor Array ◽  
Spectral Imaging ◽  
Spectral Domain ◽  
Imaging Methods ◽  
Order Of Magnitude ◽  
Spectral Multiplexing

Hyperspectral (HS) imaging involves the sensing of a scene’s spectral properties, which are often redundant in nature. The redundancy of the information motivates our quest to implement Compressive Sensing (CS) theory for HS imaging. This article provides a review of the Compressive Sensing Miniature Ultra-Spectral Imaging (CS-MUSI) camera, its evolution, and its different applications. The CS-MUSI camera was designed within the CS framework and uses a liquid crystal (LC) phase retarder in order to modulate the spectral domain. The outstanding advantage of the CS-MUSI camera is that the entire HS image is captured from an order of magnitude fewer measurements of the sensor array, compared to conventional HS imaging methods.

scholarly journals Polarizer-Free AOTF-Based SWIR Hyperspectral Imaging for Biomedical Applications

Sensors ◽  
2020 ◽  
Vol 20 (16) ◽  
pp. 4439
Author(s):  
Vladislav Batshev ◽  
Alexander Machikhin ◽  
Grigoriy Martynov ◽  
Vitold Pozhar ◽  
Sergey Boritko ◽  
...  
Keyword(s):  
Hyperspectral Imaging ◽  
Biomedical Applications ◽  
Cost Effective ◽  
Short Wave ◽  
Tunable Filter ◽  
Quality Analysis ◽  
Imaging Data ◽  
Image Quality Analysis ◽  
Data Volume ◽  
Integrate Design

Optical biomedical imaging in short wave infrared (SWIR) range within 0.9–1.7 μm is a rapidly developing technique. For this reason, there is an increasing interest in cost-effective and robust hardware for hyperspectral imaging data acquisition in this range. Tunable-filter-based solutions are of particular interest as they provide image processing flexibility and effectiveness in terms of collected data volume. Acousto-optical tunable filters (AOTFs) provide a unique set of features necessary for high-quality SWIR hyperspectral imaging. In this paper, we discuss a polarizer-free configuration of an imaging AOTF that provides a compact and easy-to-integrate design of the whole imager. We have carried out image quality analysis of this system, assembled it and validated its efficiency through multiple experiments. The developed system can be helpful in many hyperspectral applications including biomedical analyses.

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