Hyperspectral imaging: comparison of acousto-optic and liquid crystal tunable filters

Abdlaty, Ramy; Sahli, Samir; Hayward, Joseph E.; Fang, Qiyin

doi:10.1117/12.2282532

Cited by 15 publications

(18 citation statements)

References 24 publications

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“…There are two ways of acquiring the dark frames for reflectance correction. One is to keep the lens covered during exposure [54] and the other is to switch off the light source [48]. In our study, the dark frames, I dk (x, y, λ) and I dk,board (x, y, λ), are measured with the light source switched off [48].…”

Section: Entropy Of Feature Index [H(fi)] From Hyperspectral Imaging mentioning

confidence: 99%

Therapeutic Assessment of High-Intensity Focused Ultrasound for Vulvar Lichen Sclerosus by Active Dynamic Thermal Imaging and Hyperspectral Imaging—A Preliminary Study

Meng

Sui

et al. 2020

Front. Phys.

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Section: Entropy Of Feature Index [H(fi)] From Hyperspectral Imaging mentioning

confidence: 99%

Therapeutic Assessment of High-Intensity Focused Ultrasound for Vulvar Lichen Sclerosus by Active Dynamic Thermal Imaging and Hyperspectral Imaging—A Preliminary Study

Meng

Sui

et al. 2020

Front. Phys.

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“…This combination produces a three-dimensional data format. 18,19 This data includes two-dimensional spatial information along a third spectral dimension to form a datacube. The datacube's spatial information is contained in an image of the object, and its spectral information is included in capturing the same image using a sequence of spectral bands.…”

Section: Introductionmentioning

confidence: 99%

“…The measured absorption spectra for (a) MB samples(10,12,14,16,18,20, 30, 40 and 50 ppm), (b) MO samples(10,12,14,16,18,20, 30, 40 and 50 ppm) using the UV/vis spectrophotometer. (a) the absorbance measured at 660 nm, using the UV/vis spectrophotometer for the group of MB aqueous solutions with concentrations of 10, 12, 14, 16, 18, 20, 30, 40 and 50 ppm.…”

mentioning

confidence: 99%

Innovative technique for analysis of wastewater contaminants using hyperspectral imaging

Abdlaty

Gobara

Naiem

et al. 2020

J. Spectral Imaging

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Accurate, fast, quantitative on-site analysis of wastewater is an environmental necessity. Therefore, we report a quantitative spectroscopic study in order to analyse organic contaminants in wastewater. For this purpose, two spectroscopy-based techniques were utilised and their results are compared. The first technique is ultraviolet/visible (UV/vis) spectrophotometry. This technique is a standard laboratory technique, however, it is inappropriate for working in the field. Besides, the analysis results of the standard laboratory technique display low accuracy in detecting small concentrations of wastewater contaminants such as methylene blue (< 20 ppm). Accordingly, there is a need for another technique to overcome the shortcomings of UV/vis spectrophotometry. Hyperspectral imaging (HSI) combines imaging and spectrometry. HSI works on-site since it is portable and easy to operate. The analysis of the data acquired by HSI showed a higher efficacy in accurately detecting both low (< 20 ppm) and high concentrations (> 50 ppm) of water contaminants such as methylene blue and methyl orange. For verification, Pearson correlation coefficients were computed between the concentration of contaminants and their absorbance for all the operating spectral bands. The results of the two techniques were statistically compared using Bland and Altman’s limit of agreement. This study showed that HSI is potentially a promising technique for the analysis of wastewater contaminants on-site.

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“…32,33 Among the variety of designs, optical tunable filter (OTF)-based HSI is an emerging research direction. [34][35][36][37] The OTF is a controlled window that only permits a user-selected spectral band to pass. The controlling phenomena allow sorting of optical filters into different types.…”

Section: Introductionmentioning

confidence: 99%

“…18,[21][22][23] These dominant types of OTF have been compared in a few studies. 34,41,42 The AOTF enables: (1) rapid random access to spectral bands, (2) relatively long spectral range of operation, (3) robust performance in harsh environments 17,43 and (4) wide aperture within compact size-tunable filters. 21 For all of these reasons, we used AOTF in this study.…”

Section: Introductionmentioning

confidence: 99%

A novel dual-path high-throughput acousto-optic tunable filter imaging spectropolarimeter

Abdlaty

Fang

2020

J. Spectral Imaging

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It is highly demanding to identify healthy and non-healthy species in a heterogeneous environment such as human tissues. In such a case, one identifier, such as a spectral fingerprint, might be inadequate. Therefore, additional identification is required, for instance, a polarisation measurement. In view of that, the development of a spectropolarimeter that captures two cross-polarised arrays of spectral images is a key requirement. To meet this requirement, an imager optical setup has been designed to provide spatial, spectral and polarisation preference information for species that exist in a heterogeneous environment, such as in medical tissue samples. The spectral and polarisation information is obtained employing an acousto-optic tunable filter and a polarising beam splitter, respectively. The optical imager is designed to operate in the visible-near infrared range (450–850 nm) with a spectral resolution of 3 nm. The spectropolarimeter design along with optical characterisation results are reported.

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Hyperspectral imaging: comparison of acousto-optic and liquid crystal tunable filters

Cited by 15 publications

References 24 publications

Therapeutic Assessment of High-Intensity Focused Ultrasound for Vulvar Lichen Sclerosus by Active Dynamic Thermal Imaging and Hyperspectral Imaging—A Preliminary Study

Therapeutic Assessment of High-Intensity Focused Ultrasound for Vulvar Lichen Sclerosus by Active Dynamic Thermal Imaging and Hyperspectral Imaging—A Preliminary Study

Innovative technique for analysis of wastewater contaminants using hyperspectral imaging

A novel dual-path high-throughput acousto-optic tunable filter imaging spectropolarimeter

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