Narrowband double-filtering hyperspectral imaging based on a single AOTF

Zhang, Chunguang; Wang, Hao; Zhang, Zhonghua; Yuan, Jiangwei; Shi, Lei; Sheng, Zhenfei; Zhang, Xiaofa

doi:10.1364/ol.43.002126

Cited by 13 publications

(7 citation statements)

References 19 publications

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“…The spectral scanning method could also be implemented on the detection side using optical bandpass filters [8], liquid-crystal tunable filter [15,32,33], and AOTF [14,34,35]. These filters are placed in front of the camera, allowing transmission of a specific wavelength of the reflected light.…”

Section: Spectral Scanning Hsi Methodsmentioning

confidence: 99%

Hyperspectral Imaging for Clinical Applications

Yoon

2022

BioChip J

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Measuring morphological and biochemical features of tissue is crucial for disease diagnosis and surgical guidance, providing clinically significant information related to pathophysiology. Hyperspectral imaging (HSI) techniques obtain both spatial and spectral features of tissue without labeling molecules such as fluorescent dyes, which provides rich information for improved disease diagnosis and treatment. Recent advances in HSI systems have demonstrated its potential for clinical applications, especially in disease diagnosis and image-guided surgery. This review summarizes the basic principle of HSI and optical systems, deep-learning-based image analysis, and clinical applications of HSI to provide insight into this rapidly growing field of research. In addition, the challenges facing the clinical implementation of HSI techniques are discussed.

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Section: Spectral Scanning Hsi Methodsmentioning

confidence: 99%

Hyperspectral Imaging for Clinical Applications

Yoon

2022

BioChip J

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“…The central wavelength can be arbitrarily changed by modulating the frequency of the acousto-optic grating generated in a birefringent crystal material with an ultrasonic transducer. Until now, novel structures of AOTF imaging spectrometers have been developed for the purpose of performance enhancement—for instance, to improve the resolution of the spectrum or of space [ 9 , 10 ]. Moreover, some new crystalline materials [ 11 ] have emerged in the field of AOTF devices to improve the spectral range and efficiency.…”

Section: Introductionmentioning

confidence: 99%

The Calibration Methods of Geometric Parameters of Crystal for Mid-Infrared Acousto-Optic Tunable Filter-Based Imaging Systems Design

Guo

Zhao

et al. 2023

Materials

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AOTF calibration is a complex topic that has various aspects. As far as geometric calibration is concerned, it includes not only processing errors and fixing errors in the optical system, but also the error of geometric parameters of crystal (GPC). GPC is the preset input in the optical design and optimization of Zemax, which determines the key parameters, including the spatial resolution, the field of view, and aberration. In particular, the compensation of aberration during the optical design requires accurate values of GPC. However, it is currently considered ideal. Therefore, two calibration methods based on the principle of parallel tangent are proposed: (1) the minimum-central wavelength method; (2) the minimum-frequency method. The deviation of the parallel tangent incident angle calibrated by the two methods is 0.03°. As a result, the tuning curve calculated in theory with the calibrated geometric parameters of AOTF is consistent with the tuning curve measured in practice.

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“…A typical AOTF configuration includes a single AOC located between two polarizers crossed with respect to each other [ 12 ]. More effective in terms of spectral resolution and residual image distortion are double AOTFs that may consist of tandem AOCs [ 13 ] or utilize a double light pass through a single AOC by means of optical feedback [ 14 ] and back reflection [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Spectral Imaging Experiments with Various Optical Schemes Based on the Same AOTF

et al. 2021

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Spectral image filtration by means of acousto-optical tunable filters (AOTFs) has multiple applications. For its implementation, a few different optical schemes are in use. They differ in image quality, number of coupling components, dimensions and alignment complexity. To choose the optical system of AOTF-based spectral imager properly, many factors have to be considered. Though various schemes of acousto-optic (AO) filtration have been tested and discussed, their comparative analysis has not been reported up to now. In this study, we assembled the four most popular schemes (confocal, collimating, tandem and double-path) using the same AO cells and experimentally compared their main features. Depending on the application, each scheme may be the basis of compact cost-effective spectral imaging devices.

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Narrowband double-filtering hyperspectral imaging based on a single AOTF

Cited by 13 publications

References 19 publications

Hyperspectral Imaging for Clinical Applications

Hyperspectral Imaging for Clinical Applications

The Calibration Methods of Geometric Parameters of Crystal for Mid-Infrared Acousto-Optic Tunable Filter-Based Imaging Systems Design

Spectral Imaging Experiments with Various Optical Schemes Based on the Same AOTF

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