Optical Engineering最新文献_第8页

Effect of passivation coating on the HgCdTe heterostructures stability at elevated storage temperature 钝化涂层对 HgCdTe 异质结构在高储存温度下稳定性的影响

IF 1.3 4区工程技术

Optical Engineering Pub Date : 2023-11-01 DOI: 10.1117/1.OE.62.11.117103

Andrew R. Novoselov, Dmitriy Protasov, V. Kostyuchenko

{"title":"Effect of passivation coating on the HgCdTe heterostructures stability at elevated storage temperature","authors":"Andrew R. Novoselov, Dmitriy Protasov, V. Kostyuchenko","doi":"10.1117/1.OE.62.11.117103","DOIUrl":"https://doi.org/10.1117/1.OE.62.11.117103","url":null,"abstract":"Abstract. It was shown that the concentration of charge carriers and the stoichiometry of near-surface region are changed in p-type HgCdTe films with non-passivated and soiled by indium surface under storage temperatures 80°C and 120°C. The concentration of holes increased up to 1024 cm − 3 and mobility dropped up to 12 cm2 / ( V × s ) under heating. From acquired Auger spectra, it was obtained that the mercury concentration decreased but the cadmium concentration increased in near-surface region as the indium spot approached. The surface passivation by photoresist prevented these degradation processes. The current–voltage characteristics of p-n junctions around the indium spots on the surface of p-type HgCdTe films passivated by SiO2 / Si3N4 layers were measured after storage temperatures from 60°C up to 120° C. It was found that the p-n junctions closest to the indium spots have an increased dark current. The usage of an additional passivation layer of anodic oxide suppressed the appearance of regions with increased dark currents. It was concluded that the additional passivation layer of anodic oxide is necessary for durable and stable work of infrared detector arrays based on HgCdTe films.","PeriodicalId":19561,"journal":{"name":"Optical Engineering","volume":"1 1","pages":"117103 - 117103"},"PeriodicalIF":1.3,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139301232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tool-free axis calibration method for self-rotating three-dimensional vision systems 自旋转三维视觉系统的免工具轴校准方法

IF 1.3 4区工程技术

Optical Engineering Pub Date : 2023-11-01 DOI: 10.1117/1.OE.62.11.114105

Jinyue Liu, Xinyuan Cao, Xiaohui Jia, Yiran Ma, Guanghao Li, Tiejun Li

{"title":"Tool-free axis calibration method for self-rotating three-dimensional vision systems","authors":"Jinyue Liu, Xinyuan Cao, Xiaohui Jia, Yiran Ma, Guanghao Li, Tiejun Li","doi":"10.1117/1.OE.62.11.114105","DOIUrl":"https://doi.org/10.1117/1.OE.62.11.114105","url":null,"abstract":"Abstract. The self-rotating three-dimensional (3D) visual scanning system is a prevalent technique for 3D reconstruction. However, the misalignment of the scanner’s rotation axis with the camera’s origin often necessitates specialized calibration tools to establish their relative positions. We propose a rotating axis calibration method for the rotation axis, which eliminates the need for specific tools. A rotating mechanism is used to rotate the 3D camera to different angles and carry out 3D reconstruction of the same object with curved surface characteristics, respectively. The resulting sequence of 3D point clouds is registered to derive the camera’s position transformation matrix corresponding to each rotation angle. Subsequently, we compute the positional relationship between the camera and the rotation axis by solving the equation. To prevent excessively large rotation angles that would cause the object beyond the camera’s field of view, the camera field extension method is proposed, which enhances equation redundancy and leads to improved calibration accuracy. Experiments prove the flexibility and accuracy of the proposed method.","PeriodicalId":19561,"journal":{"name":"Optical Engineering","volume":"65 1","pages":"114105 - 114105"},"PeriodicalIF":1.3,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139305172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optical performance of commercial liquid lens assemblies in microgravity 商用液体透镜组件在微重力环境下的光学性能

IF 1.3 4区工程技术

Optical Engineering Pub Date : 2023-11-01 DOI: 10.1117/1.OE.62.11.113106

Shreeyam Kacker, Kerri L. Cahoy

{"title":"Optical performance of commercial liquid lens assemblies in microgravity","authors":"Shreeyam Kacker, Kerri L. Cahoy","doi":"10.1117/1.OE.62.11.113106","DOIUrl":"https://doi.org/10.1117/1.OE.62.11.113106","url":null,"abstract":"Abstract. Focus-tunable liquid lenses are used in various applications due to their compact size, light weight, low power consumption, and cost effectiveness. They have the potential for use in space applications, such as focus compensation, optical communications, and imaging systems. However, liquid lenses have not yet been evaluated for use in the space environment. This work focuses on characterizing operational differences of commercially available liquid lenses from Corning Varioptic and Optotune between Earth gravity, microgravity, and hypergravity environments. Results show a linear drift in the tip/tilt of 0.80 and 4.20 mrad going from 1 to 0 g for the Corning Varioptic A-39N0 lens and Optotune EL-16-40-TC-VIS lens, respectively, with lower optical aberrations in microgravity. Additionally, a significant but small increase in focal power going from 1 to 0 g by 0.02 D is observed for the Optotune lens. No significant change in focal power is observed for the Corning Varioptic lens tested in this experiment. Additionally, potential multi-beam interference is observed in defocus patterns of the Corning Varioptic lens tested during the experiment.","PeriodicalId":19561,"journal":{"name":"Optical Engineering","volume":"9 1","pages":"113106 - 113106"},"PeriodicalIF":1.3,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139297211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Retrieval of phase and three-dimensional topography using modified transport of intensity and phase equations with electrically programmable optical path lengths 利用带电可编程光路长度的改良强度和相位传输方程检索相位和三维地形图

IF 1.3 4区工程技术

Optical Engineering Pub Date : 2023-11-01 DOI: 10.1117/1.OE.62.11.113102

Nouf Alanazi, Partha P. Banerjee

{"title":"Retrieval of phase and three-dimensional topography using modified transport of intensity and phase equations with electrically programmable optical path lengths","authors":"Nouf Alanazi, Partha P. Banerjee","doi":"10.1117/1.OE.62.11.113102","DOIUrl":"https://doi.org/10.1117/1.OE.62.11.113102","url":null,"abstract":"Abstract. Transport of intensity (TI) is a well-known non-interferometric technique for phase retrieval. The TI and phase equations result from the Helmholtz equation and show the coupling of intensity and phase during optical propagation. TI is an alternative to digital holography, which requires a reference beam for a recording of the interference pattern. However, the conventional TI method has an experimental challenge in that mechanical displacement of the camera or object is needed to record the optical intensities at multiple defocused planes, which can cause errors from misalignments. This work expands on a modified TI technique that avoids mechanical displacements, instead invoking the use of electrooptic materials to create an optical phase difference and hence optical path length through the application of a bias voltage. We demonstrate the use of the modified TI equation (TIE) through simulation and experiment by selecting suitable objects and a biased nematic liquid crystal cell made from pentyl-4-cyanobiphenyl (5CB). The corresponding modified transport of phase equation is also derived and is used to enhance the accuracy of the modified TIE. After providing simulation results for imaged phase retrieval, we demonstrate the unwrapped image phase and hence height or profile extraction for an object with three-dimensional topography using this technique.","PeriodicalId":19561,"journal":{"name":"Optical Engineering","volume":"21 1","pages":"113102 - 113102"},"PeriodicalIF":1.3,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139302153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of wavelength accuracy of reconstruction-equivalent-chirp laser arrays on performance of wavelength division multiplexing space laser communication system 重构等效啁啾激光阵列的波长精度对波分复用空间激光通信系统性能的影响

IF 1.3 4区工程技术

Optical Engineering Pub Date : 2023-11-01 DOI: 10.1117/1.OE.62.11.118103

Mi Li, Anni Li, Chuanbo Zhang, Jiaqiang Nie, Yue-chun Shi, Yuejiang Song, Xiangfei Chen

{"title":"Effect of wavelength accuracy of reconstruction-equivalent-chirp laser arrays on performance of wavelength division multiplexing space laser communication system","authors":"Mi Li, Anni Li, Chuanbo Zhang, Jiaqiang Nie, Yue-chun Shi, Yuejiang Song, Xiangfei Chen","doi":"10.1117/1.OE.62.11.118103","DOIUrl":"https://doi.org/10.1117/1.OE.62.11.118103","url":null,"abstract":"Abstract. To evaluate the effect of crosstalk caused by wavelength deviation of reconstruction-equivalent-chirp (REC) integrated multi-wavelength laser arrays (MWLAs) on an optical free-space communication system in which wavelength division multiplexing (WDM) is applied, we derive the model of power penalty caused by the wavelength deviation of REC-MWLAs and the bit error rate (BER) of the system under atmospheric turbulence and conduct a numerical simulation. The two adjacent channels in arranged REC laser arrays are defined as the analysis scope. We find that the power penalty is more sensitive to the deviation of the channel itself than the adjacent channel as the frequency shift increases from 0 to 50 GHz. The numerical relationship between the BER and power penalty is drawn to further investigate the tolerance for wavelength deviation under the requirements of BER < 10 − 6 and BER < 10 − 9. In addition, for a smaller deviation of 5 GHz of the analyzed channel, the linewidth compression of the REC laser can decrease the power penalty from 1.3 to 0.7 dB, improving the system performance and moderating the demands for deviation of REC-MWLAs, and the gemination of channel spacing does not evidently reduce the requirement for deviation. The results of this work demonstrate the feasibility of REC-MWLAs as the light source of WDM free-space communication systems under atmospheric turbulence and provide an effective reference for the allowable deviation in the design and testing of MWLAs.","PeriodicalId":19561,"journal":{"name":"Optical Engineering","volume":"24 1","pages":"118103 - 118103"},"PeriodicalIF":1.3,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139303441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Image capturing and stitching system based on scale-invariant feature transform features for untextured and smooth objects 基于尺度不变特征变换特征的图像捕捉和拼接系统，适用于无纹理和光滑物体

IF 1.3 4区工程技术

Optical Engineering Pub Date : 2023-11-01 DOI: 10.1117/1.OE.62.11.113103

Chun-Fu Lin, Chen-Wei Su, Chin-Sheng Chen

{"title":"Image capturing and stitching system based on scale-invariant feature transform features for untextured and smooth objects","authors":"Chun-Fu Lin, Chen-Wei Su, Chin-Sheng Chen","doi":"10.1117/1.OE.62.11.113103","DOIUrl":"https://doi.org/10.1117/1.OE.62.11.113103","url":null,"abstract":"Abstract. Many stitching studies employ improved scale-invariant feature transform (SIFT) or speeded up robust features (SURFs) stitching algorithms, owing to their excellent robustness against variations in scale and rotations of input images. Traditional SIFT-based stitching algorithms suffer from the limitation of having insufficient feature points that can be extracted and matched from untextured and smooth objects, resulting in stitching failure. To overcome this issue, we propose a system that uses a proposed laser pattern projection (LASPP)-pasted texture technique before feature point extraction and description. The proposed system can extract and describe feature points based on SIFT feature extraction techniques. The progressive sample consistency (PROSAC) algorithm was used to remove false matching points and enhance the accuracy in matching feature points. The experimental results clearly revealed the effect of the pattern projected using LASPP on the stitching results. Furthermore, the efficiency of the proposed system, which employed the PROSAC algorithm, in matching feature points, was compared with that of the traditional system, which used the random sample consensus algorithm. Additionally, the stitching quality of the proposed system was compared with that of other SIFT- and SURF-based stitching systems.","PeriodicalId":19561,"journal":{"name":"Optical Engineering","volume":"19 1","pages":"113103 - 113103"},"PeriodicalIF":1.3,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139292931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modeling of melt pool and thermal field simulation for wide-band laser cladding 宽波段激光熔覆的熔池建模和热场模拟

IF 1.3 4区工程技术

Optical Engineering Pub Date : 2023-11-01 DOI: 10.1117/1.OE.62.11.116103

Bin Hu, Jianhai Han, Xiangpan Li, Junhua Wang

{"title":"Modeling of melt pool and thermal field simulation for wide-band laser cladding","authors":"Bin Hu, Jianhai Han, Xiangpan Li, Junhua Wang","doi":"10.1117/1.OE.62.11.116103","DOIUrl":"https://doi.org/10.1117/1.OE.62.11.116103","url":null,"abstract":"Abstract. The accuracy of thermal analysis modeling for direct energy deposition is compromised if the Marangoni effect is ignored. The anisotropic enhanced thermal conductivity approach can improve the fidelity of the transient finite element (FE) thermal model, but the determination of the enhanced factors is generally based on empirical knowledge or trial and error. In this study, single track cladding experiments were conducted at different process parameters, the cladding process was recorded by an infrared camera, and the melt pool width and length were extracted from the infrared images. The best match enhanced factors were confirmed according to the comparison between the simulated and experimental melt pool sizes. The findings suggest that the best match enhanced factors are not a constant value, but rather vary with changes of process parameters. With the enhanced factors increasing, the peak melt pool temperature drops sharply at first and then tends to be stable. The melt pool width remains almost unchanged, whereas the melt pool length exhibits a slight increase. Laser specific energy was found to be a suitable metric to characterize the convection features and intensity of the melt pool. An empirical model of laser specific energy and enhanced factors was derived through linear regression analysis, which greatly simplified the determination of the enhanced factors. The experimental results showed that the error of the FE thermal model in predicting the melt pool size was less than 6.3%.","PeriodicalId":19561,"journal":{"name":"Optical Engineering","volume":"16 1","pages":"116103 - 116103"},"PeriodicalIF":1.3,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139293192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparison of scene contrast temperature in mid-wave infrared and long-wave infrared 中波红外和长波红外场景对比温度比较

IF 1.3 4区工程技术

Optical Engineering Pub Date : 2023-11-01 DOI: 10.1117/1.OE.62.11.113107

Shane Jordan, Ronald G. Driggers, Orges Furxhi, Patrick Leslie, Col Cavanaugh, Kyle Renshaw, Eddie L. Jacobs

{"title":"Comparison of scene contrast temperature in mid-wave infrared and long-wave infrared","authors":"Shane Jordan, Ronald G. Driggers, Orges Furxhi, Patrick Leslie, Col Cavanaugh, Kyle Renshaw, Eddie L. Jacobs","doi":"10.1117/1.OE.62.11.113107","DOIUrl":"https://doi.org/10.1117/1.OE.62.11.113107","url":null,"abstract":"Abstract. One of the primary activities in emissive infrared imager design is the trade on whether to use midwave infrared (MWIR) or longwave infrared (LWIR) in the application. Applications include target acquisition (both target search and target identification), threat warning, aircraft detection, and pilotage. There has been a great deal of work in the characterization of MWIR versus LWIR target signatures. There has been much less work in the characterization of scene (sometimes called background) contrast. The scene contrast of the background can be just as important in the performance of the sensor in an application. A few examples are: (1) a high scene contrast with high clutter contrast can make target search much more difficult, (2) a high scene contrast with image-based navigation can enhance the performance of location estimation, and (3) high scene contrast with mobility sensors can enhance the flying performance of a rotorcraft pilotage system. We discuss the differences observed in scene contrast between MWIR and LWIR bands. This provides a scene contrast characterization for emissive infrared applications. Radiometrically calibrated imagery is acquired with MWIR and LWIR cameras in various environments, and the measured MWIR and LWIR scene contrast is compared. The radiometric comparison is performed in terms of the standard deviation of the scene equivalent blackbody temperature. Comparisons are provided under different conditions, such as rural versus urban and day versus night. This comparison enables the infrared system designer with the means to perform detailed engineering trades.","PeriodicalId":19561,"journal":{"name":"Optical Engineering","volume":"40 1","pages":"113107 - 113107"},"PeriodicalIF":1.3,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139294165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design of high-Q photonic crystal ring resonator incorporating Gaussian distributed inner rods for refractive index sensor 折射率传感器用高斯分布内棒高q光子晶体环形谐振腔的设计

4区工程技术

Optical Engineering Pub Date : 2023-11-01 DOI: 10.1117/1.oe.62.11.116101

Uttara Biswas, Jayanta Kumar Rakshit, Chittaranjan Nayak

引用次数: 0

Adaptive received signal strength-based localization and channel state information estimation model for indoor multiple-input multiple-output visible light communication using the distance vector 利用距离向量为室内多输入多输出可见光通信建立基于接收信号强度的自适应定位和信道状态信息估计模型

IF 1.3 4区工程技术

Optical Engineering Pub Date : 2023-11-01 DOI: 10.1117/1.OE.62.11.118104

Tran The Son, Vuong Cong Dat, H. Le‐Minh, Zabih Ghassemlooy, Duong Huu Ai, Huynh Cong Phap

{"title":"Adaptive received signal strength-based localization and channel state information estimation model for indoor multiple-input multiple-output visible light communication using the distance vector","authors":"Tran The Son, Vuong Cong Dat, H. Le‐Minh, Zabih Ghassemlooy, Duong Huu Ai, Huynh Cong Phap","doi":"10.1117/1.OE.62.11.118104","DOIUrl":"https://doi.org/10.1117/1.OE.62.11.118104","url":null,"abstract":"Abstract. We propose an adaptive localization and channel state information (CSI) estimation model using the distance vector for indoor multiple-input multiple-output (MIMO) visible light communication (VLC). Under normal conditions, receivers (Rxs) require the CSI of all channels [formed by multiple transmitters (Txs) and multiple Rxs] to recover the original data, and the received signal strength (RSS) obtained from Txs, i.e., light-emitting diodes (LEDs) to predict the Rx’s location. A beacon [or pilot signal (PS)] with CSI is periodically broadcasted from each LED to MIMO Rxs for constructing the CSI matrix and measuring the RSS. However, in an abnormal condition, PSs from one or multiple Txs might not reach Rxs due to shadowing, thus resulting in a failure in positioning and data recovery. To combat this, the proposed model enables the Rx to predict its location without the need for all PSs based on the construction of the distance vectors at Rx. Simulations conducted for two scenarios of user’s mobility, i.e., lattice and random direction mobility, show a low positioning error of ∼0.1 and 0.2 m, respectively. Based on predicted positions, MIMO VLC is capable of fulfilling the CSI matrix and assists the Rx in recovering transmitted data with a very low bit error rate.","PeriodicalId":19561,"journal":{"name":"Optical Engineering","volume":"50 1","pages":"118104 - 118104"},"PeriodicalIF":1.3,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139291215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0