Design and evaluation of a THz time domain imaging system using standard optical design software

2008 ◽  
Vol 47 (27) ◽  
pp. 4994 ◽  
Author(s):  
Claudia Brückner ◽  
Boris Pradarutti ◽  
Ralf Müller ◽  
Stefan Riehemann ◽  
Gunther Notni ◽  
...  
Keyword(s):  
Time Domain ◽  
Imaging System ◽  
Optical Design ◽  
Design Software

Analysis of a Terahertz Array Imaging System Using Optical Design Software

2011 ◽  
Vol 38 (4) ◽  
pp. 0411001
Author(s):  
李琦 Li Qi ◽  
夏志伟 Xia Zhiwei ◽  
姚睿 Yao Rui ◽  
丁胜晖 Ding Shenghui ◽  
王骐 Wang Qi
Keyword(s):  
Imaging System ◽  
Optical Design ◽  
Design Software ◽  
Array Imaging

Advanced Non-Destructive Fault Isolation Techniques for PCB Substrates Using Magnetic Current Imaging and Terahertz Time Domain Reflectometry

2018 ◽  
Author(s):  
Daechul Choi ◽  
Yoonseong Kim ◽  
Jongyun Kim ◽  
Han Kim
Keyword(s):  
Time Domain ◽  
Quantum Interference ◽  
Flip Chip ◽  
Imaging System ◽  
Time Domain Reflectometry ◽  
Fault Isolation ◽  
Magnetic Current ◽  
Isolation Techniques ◽  
Super Conducting ◽  
Non Destructive

Abstract In this paper, we demonstrate cases for actual short and open failures in FCB (Flip Chip Bonding) substrates by using novel non-destructive techniques, known as SSM (Scanning Super-conducting Quantum Interference Device Microscopy) and Terahertz TDR (Time Domain Reflectometry) which is able to pinpoint failure locations. In addition, the defect location and accuracy is verified by a NIR (Near Infra-red) imaging system which is also one of the commonly used non-destructive failure analysis tools, and good agreement was made.

scholarly journals Optical Aberration Calibration and Correction of Photographic System Based on Wavefront Coding

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 4011
Author(s):  
Chuanwei Yao ◽  
Yibing Shen
Keyword(s):  
Imaging System ◽  
Optical Design ◽  
Computational Imaging ◽  
Large Field ◽  
Wavefront Aberration ◽  
Imaging Method ◽  
Image Deconvolution ◽  
Pupil Function ◽  
Wavefront Coding ◽  
Blurred Images

The image deconvolution technique can recover potential sharp images from blurred images affected by aberrations. Obtaining the point spread function (PSF) of the imaging system accurately is a prerequisite for robust deconvolution. In this paper, a computational imaging method based on wavefront coding is proposed to reconstruct the wavefront aberration of a photographic system. Firstly, a group of images affected by local aberration is obtained by applying wavefront coding on the optical system’s spectral plane. Then, the PSF is recovered accurately by pupil function synthesis, and finally, the aberration-affected images are recovered by image deconvolution. After aberration correction, the image’s coefficient of variation and mean relative deviation are improved by 60% and 30%, respectively, and the image can reach the limit of resolution of the sensor, as proved by the resolution test board. Meanwhile, the method’s robust anti-noise capability is confirmed through simulation experiments. Through the conversion of the complexity of optical design to a post-processing algorithm, this method offers an economical and efficient strategy for obtaining high-resolution and high-quality images using a simple large-field lens.

scholarly journals Design and Implementation Guidelines for a Modular Spectral-Domain Optical Coherence Tomography Scanner

2018 ◽  
Vol 2018 ◽  
pp. 1-22 ◽  
Author(s):  
Farid Atry ◽  
Israel Jacob De La Rosa ◽  
Kevin R. Rarick ◽  
Ramin Pashaie
Keyword(s):  
Optical Coherence Tomography ◽  
Imaging System ◽  
Optical Design ◽  
Spectral Domain ◽  
Design Parameters ◽  
Optical Coherence ◽  
Custom Made ◽  
Essential Knowledge ◽  
Sd Oct

In the past decades, spectral-domain optical coherence tomography (SD-OCT) has transformed into a widely popular imaging technology which is used in many research and clinical applications. Despite such fast growth in the field, the technology has not been readily accessible to many research laboratories either due to the cost or inflexibility of the commercially available systems or due to the lack of essential knowledge in the field of optics to develop custom-made scanners that suit specific applications. This paper aims to provide a detailed discussion on the design and development process of a typical SD-OCT scanner. The effects of multiple design parameters, for the main optical and optomechanical components, on the overall performance of the imaging system are analyzed and discussions are provided to serve as a guideline for the development of a custom SD-OCT system. While this article can be generalized for different applications, we will demonstrate the design of a SD-OCT system and representative results for in vivo brain imaging. We explain procedures to measure the axial and transversal resolutions and field of view of the system and to understand the discrepancies between the experimental and theoretical values. The specific aim of this piece is to facilitate the process of constructing custom-made SD-OCT scanners for research groups with minimum understanding of concepts in optical design and medical imaging.

scholarly journals Research on Laser Dazzle Simulation Using ZEMAX Software and MATLAB

2020 ◽  
Vol 327 ◽  
pp. 02001
Author(s):  
Niu jin ◽  
Xu xiping ◽  
An zhiyong
Keyword(s):  
Ray Tracing ◽  
Programming Language ◽  
Optical Design ◽  
Optical Element ◽  
Analysis Model ◽  
Software Simulation ◽  
Scope Of Application ◽  
Disability Glare ◽  
Design Software ◽  
Calibration And Verification

The dazzling process of the laser has been digitally simulated. First, the optical design software (ZEMAX) is combined with the scientific programming language (MATLAB), then the ray tracing is used to build the scattering model of each optical element, and finally compared with a simpler model based on CIE disability glare data to achieve the calibration and verification of the software simulation effect. The results show that this advanced optical eye simulation technology can be used to study the laser glare efficiency, and it is possible to expand the scope of application of the analysis model.

scholarly journals Optical Design of a Shortwave Infrared Dual Camera CASSI Based on Improved Offner-Wynne Imaging Spectrometer

2021 ◽  
Vol 2112 (1) ◽  
pp. 012021
Author(s):  
Chong Song ◽  
Lipeng Huo ◽  
Yong Huang ◽  
Yangdong Yan ◽  
Gang Wang ◽  
...  
Keyword(s):  
Optical System ◽  
Imaging System ◽  
Optical Measurement ◽  
Focal Length ◽  
Optical Design ◽  
Optical Transmittance ◽  
Coded Aperture ◽  
Visual Axis ◽  
Imaging Spectrometer ◽  
Shortwave Infrared

Abstract Based on the optical system characteristics of coded aperture snapshot spectral imager (CASSI), an optimized optical system of shortwave infrared dual camera CASSI was designed based on improved Offner-Wynne imaging spectrometer. The operating wavelength of the optical system ranges from 900nm to 1700nm, and the focal length is 1200mm. It consists of two parts: the two dimensional imaging system and the multispectral CASSI imaging system. The key technical parameters of the two parts are the same and there is no visual axis difference. Therefore, the optimized optical system can effectively improve real-time performance, optical transmittance and compactness of the dual camera shortwave infrared CASSI, which is conducive to the application in optical measurement scenes in the shooting range.

scholarly journals Time-domain imaging system in the terahertz range for immovable cultural heritage materials

Strain ◽  
2018 ◽  
Vol 55 (2) ◽  
pp. e12292
Author(s):  
David Giovannacci ◽  
Hoi Ching Cheung ◽  
Gillian C. Walker ◽  
John W. Bowen ◽  
Dominique Martos-Levif ◽  
...  
Keyword(s):  
Cultural Heritage ◽  
Time Domain ◽  
Imaging System ◽  
Terahertz Range

Optical Design of Decentered Aperture-Divided Polarization Imaging System

2013 ◽  
Vol 33 (6) ◽  
pp. 0622005 ◽  
Author(s):  
贺虎成 He Hucheng ◽  
季轶群 Ji Yiqun ◽  
周建康 Zhou Jiankang ◽  
赵知诚 Zhao Zhicheng ◽  
沈为民 Shen Weimin
Keyword(s):  
Imaging System ◽  
Optical Design ◽  
Polarization Imaging

Optical Design and Stray-Light Analysis of Urban Night-Light Remote Sensing Imaging System

2020 ◽  
Vol 57 (1) ◽  
pp. 012201
Author(s):  
姜守望 Jiang Shouwang ◽  
夏振涛 Xia Zhentao ◽  
孙永雪 Sun Yongxue ◽  
王珂 Wang Ke
Keyword(s):  
Remote Sensing ◽  
Imaging System ◽  
Optical Design ◽  
Stray Light

Optical design of light guide prisms with surface roughness for automotive tail lights

2020 ◽  
Vol 234 (9) ◽  
pp. 2393-2401
Author(s):  
Elif Güney ◽  
Mürsel Alper ◽  
Mürşide Hacıismailoğlu
Keyword(s):  
Surface Roughness ◽  
Light Guide ◽  
Optical Design ◽  
Luminous Intensity ◽  
Legal Requirements ◽  
Design Software ◽  
Simulation Results ◽  
Light Guides ◽  
Illuminance Uniformity

This study presents the optical design of light guide prisms for automotive tail light applications to obtain the optimum luminous intensity and the illuminance uniformity. The design was achieved using optical design software, SPEOS. By considering the axial luminous intensity and legal requirements, the optimum prism angles of light guides were determined by simulations. After determining the prism angles, the effect of different surface roughness on the luminous intensity and the illuminance uniformity was investigated. The light guides designed by considering data from the simulation were manufactured as prototypes and their photometrical measurements were made. These measurements were compared to the simulation results. It was observed that simulation and prototype results are well in agreement with each other. Furthermore, it was found that as the surface roughness increases both the luminous intensity decreases and the illumination becomes more uniform.

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