The Review of scientific instruments最新文献_第2页

Density measurements for the National Ignition Facility (NIF) opacity platform. 国家点火装置(NIF)不透明平台的密度测量。

IF 1.6

The Review of scientific instruments Pub Date : 2022-11-01 DOI: 10.1063/5.0099764

Y P Opachich, R F Heeter, H M Johns, E S Dodd, J L Kline, N S Krasheninnikova, D C Mayes, M H Montgomery, D E Winget, T J Urbatsch, T S Perry

引用次数: 0

Toward the fabrication of a 5-μm-resolution Wolter microscope for the National Ignition Facility (invited). 国家点火装置用5 μm分辨率Wolter显微镜的研制(特邀)。

IF 1.6

The Review of scientific instruments Pub Date : 2022-11-01 DOI: 10.1063/5.0101304

Patrick R Champey, Jeffery Kolodziejczak, Bernard Kozioziemski, Jacqueline Davis, Charles Griffith, Tom Kester, Kiranmayee Kilaru, Amy Meekham, Joe Menapace, Brian Ramsey, Oliver J Roberts, Javier Sanchez, Panini Singam, W Scott Smith, Chet Speegle, Mark Stahl, Tayyab Suratwala, Nick Thomas, Mark Young, Julia K Vogel

{"title":"Toward the fabrication of a 5-μm-resolution Wolter microscope for the National Ignition Facility (invited).","authors":"Patrick R Champey, Jeffery Kolodziejczak, Bernard Kozioziemski, Jacqueline Davis, Charles Griffith, Tom Kester, Kiranmayee Kilaru, Amy Meekham, Joe Menapace, Brian Ramsey, Oliver J Roberts, Javier Sanchez, Panini Singam, W Scott Smith, Chet Speegle, Mark Stahl, Tayyab Suratwala, Nick Thomas, Mark Young, Julia K Vogel","doi":"10.1063/5.0101304","DOIUrl":"https://doi.org/10.1063/5.0101304","url":null,"abstract":"Advancements in computer-controlled polishing, metrology, and replication have led to an x-ray mirror fabrication process that is capable of producing high-resolution Wolter microscopes. We present the fabrication and test of a nickel-cobalt replicated full-shell x-ray mirror that was electroformed from a finely figured and polished mandrel. This mandrel was designed for an 8-m source-to-detector-distance microscope, with 10× magnification, and was optimized to reduce shell distortions that occur within 20 mm of the shell ends. This, in combination with an improved replication tooling design and refined bath parameters informed by a detailed COMSOL Multiphysics® model, has led to reductions in replication errors in the mirrors. Mandrel surface fabrication was improved by implementing a computer-controlled polishing process that corrected the low-frequency mandrel figure error and achieved <2.0 nm RMS convergence error. X-ray tests performed on a pair of mirror shells replicated from the mandrel have demonstrated <10 μm full-width at half-maximum (FWHM) spatial resolution. Here, we discuss the development process, highlight results from metrology and x-ray testing, and define a path for achieving a program goal of 5 μm FWHM resolution.","PeriodicalId":519534,"journal":{"name":"The Review of scientific instruments","volume":" ","pages":"113504"},"PeriodicalIF":1.6,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40549125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Battery screen print defect detection based on stationary velocity fields neural network matching and optical flow rectification. 基于固定速度场神经网络匹配和光流整流的电池丝网印刷缺陷检测。

IF 1.6

The Review of scientific instruments Pub Date : 2022-11-01 DOI: 10.1063/5.0095555

Zhuo Zhao, Bing Li, Shaojie Zhang, Tongkun Liu, Jie Cao

{"title":"Battery screen print defect detection based on stationary velocity fields neural network matching and optical flow rectification.","authors":"Zhuo Zhao, Bing Li, Shaojie Zhang, Tongkun Liu, Jie Cao","doi":"10.1063/5.0095555","DOIUrl":"https://doi.org/10.1063/5.0095555","url":null,"abstract":"In this study, an automatic defect detection method is proposed for screen printing in battery manufacturing. It is based on stationary velocity field (SVF) neural network template matching and the Lucas-Kanade (L-K) optical flow algorithm. The new method can recognize and classify different defects, such as lacking, skew, and blur, under the condition of irregular shape distortion. Three critical processing stages are performed during detection: (1) Image preprocessing was performed to acquire the printed region of interest and then image blocking was carried out for template creation. (2) The SVF network for image registration was constructed and the corresponding dataset was built based on oriented fast and rotated brief feature matching. (3) Irregular print distortion was rectified and defects were extracted using L-K optical flow and image subtraction. Software and hardware systems have been developed to support this method in industrial applications. To improve environment adaptation, we proposed a dynamic template updating mechanism to optimize the detection template. From the experiments, it can be concluded that the method has desirable performance in terms of accuracy (97%), time efficiency (485 ms), and resolution (0.039 mm). The proposed method possesses the advantages of image registration, defect extraction, and industrial efficiency compared to conventional methods. Although they suffer from irregular print distortions in batteries, the proposed method still ensures a higher detection accuracy.","PeriodicalId":519534,"journal":{"name":"The Review of scientific instruments","volume":" ","pages":"115110"},"PeriodicalIF":1.6,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40549660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Directed delivery of terahertz frequency radiation from quantum cascade lasers within a dry 3He dilution refrigerator. 在干燥的3He稀释冰箱内，量子级联激光器定向输送太赫兹频率辐射。

IF 1.6

The Review of scientific instruments Pub Date : 2022-11-01 DOI: 10.1063/5.0102553

M Vaughan, W Michailow, M Salih, L Li, H Beere, D A Ritchie, E H Linfield, A G Davies, J E Cunningham

{"title":"Directed delivery of terahertz frequency radiation from quantum cascade lasers within a dry 3He dilution refrigerator.","authors":"M Vaughan, W Michailow, M Salih, L Li, H Beere, D A Ritchie, E H Linfield, A G Davies, J E Cunningham","doi":"10.1063/5.0102553","DOIUrl":"https://doi.org/10.1063/5.0102553","url":null,"abstract":"We present a scheme for the full integration of terahertz (THz) frequency quantum cascade lasers (QCLs) within a dilution refrigerator in order to provide a directed delivery of THz power into the sample space. We describe a successful operation of a 2.68 THz QCL located on the pulse tube cooler stage of the refrigerator, with its output coupled onto a two-dimensional electron gas (2DEG) located on a milli-kelvin sample stage via hollow metal waveguides and Hysol thermal isolators, achieving a total loss from QCL to the sample of ∼-9 dB. The thermal isolators limit heat leaks to the sample space, with a base temperature of ∼210 mK being achieved. We observe cyclotron resonance (CR) induced in the 2DEG by the QCL and explore the heating impact of the QCL on all stages of the refrigerator. The CR effect induced by the THz QCL is observable at electron temperatures as low as ∼430 mK. The results show a viable route for the exploitation of THz QCLs within the environment of a dilution refrigerator and for the THz power delivery in very low-temperature (<0.5 K) condensed matter experiments.","PeriodicalId":519534,"journal":{"name":"The Review of scientific instruments","volume":" ","pages":"113906"},"PeriodicalIF":1.6,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40549664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Methods and instruments for the measurement of numerical aperture for microscope objective lens: A mini review. 显微镜物镜数值孔径测量方法及仪器综述。

IF 1.6

The Review of scientific instruments Pub Date : 2022-11-01 DOI: 10.1063/5.0095896

Cuiling Zhang

引用次数: 2

Investigating the effect of the mean path length on reluctance actuator output force characterization. 研究平均路径长度对磁阻执行器输出力特性的影响。

IF 1.6

The Review of scientific instruments Pub Date : 2022-11-01 DOI: 10.1063/5.0099324

Michael Pumphrey, Mohammad Al Saaideh, Kaitlyn Kuchinkaa, Natheer Alatawneh, Mohammad Al Janaideh

{"title":"Investigating the effect of the mean path length on reluctance actuator output force characterization.","authors":"Michael Pumphrey, Mohammad Al Saaideh, Kaitlyn Kuchinkaa, Natheer Alatawneh, Mohammad Al Janaideh","doi":"10.1063/5.0099324","DOIUrl":"https://doi.org/10.1063/5.0099324","url":null,"abstract":"This paper investigates the effect of the flux's mean path length (MPL) on the reluctance actuator's analytical model. It determines the circumstances where the model neglecting the MPL is valid. The analysis is carried out for both C-Core and E-Core reluctance actuators; the analytical results are calculated by using MATrix LABoratory and then validated against a finite element model simulation by using COMputer SOLution Multiphysics. In addition, the experimental results of the magnetic force of C-Core and E-Core reluctance actuators are presented and compared with the analytical model. The comparison is obtained under different input currents and air gaps for two different ferromagnetic materials. It can be concluded that the analytical model is valid only for air gaps with a relatively high air gap displacement and for small air gaps, considering the MPL is necessary for accurate results. This means that whenever the reluctance actuator is proposed for high-precision motion system applications, it is essential that the analysis takes into account the effect of the MPL.","PeriodicalId":519534,"journal":{"name":"The Review of scientific instruments","volume":" ","pages":"115001"},"PeriodicalIF":1.6,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40459308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An integrated instrument of a tandem quadrupole mass spectrometer for cluster reaction and soft-landing deposition. 串联四极杆质谱仪用于团簇反应和软着陆沉积的集成仪器。

IF 1.6

The Review of scientific instruments Pub Date : 2022-11-01 DOI: 10.1063/5.0112401

Benben Huang, Haiming Wu, Mengzhou Yang, Zhixun Luo

{"title":"An integrated instrument of a tandem quadrupole mass spectrometer for cluster reaction and soft-landing deposition.","authors":"Benben Huang, Haiming Wu, Mengzhou Yang, Zhixun Luo","doi":"10.1063/5.0112401","DOIUrl":"https://doi.org/10.1063/5.0112401","url":null,"abstract":"We have developed an integrated instrument system of a multiple-ion laminar flow tube (MIFT) reactor combined with a tandem quadrupole mass spectrometer (TQMS) and soft-landing deposition (SD) apparatus. A customized water-cooling magnetron sputtering (MagS) source is designed, by which we are able to attain a highly efficient preparation of metal clusters of 1-30 atoms with tunable size distributions. Following the MagS source, a laminar flow tube reactor is designed, allowing for sufficient gas-collision reactions of the as-prepared metal clusters, which is advantageous for probing magic clusters and minimizing wall effects when probing the reaction dynamics of such clusters. The customized TQMS analyzer involves a conical octupole, two linear octupoles, a quadruple ion deflector, and a 19 mm quadruple mass analyzer, allowing to decrease the pressure stepwise (from ∼5 to ∼10-9 Torr), thus ensuring high sensitivity and high resolution of the mass spectrometry analysis. In addition, we have designed a dual SD apparatus for the mass-selected deposition of clusters and their reaction products. For the whole system, abbreviated as MagS-MIFT-TQMS-SD, we have performed a detailed ions-fly simulation and quantitatively estimated the ions transfer efficiency under vacuum conditions determined by real experiments. Taking these advantages, well-resolved Pbn +, Agn +, and Nbn + clusters have been produced, allowing for meticulous studies of cluster reactions under sufficient gas-phase collisions free of electric field trapping. Also, we have tested the efficiency of the dual SD.","PeriodicalId":519534,"journal":{"name":"The Review of scientific instruments","volume":" ","pages":"113307"},"PeriodicalIF":1.6,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40459311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Three-dimensional iterative reconstruction of pulsed radiation sources using spherical harmonic decomposition. 基于球谐分解的脉冲辐射源三维迭代重建。

IF 1.6

The Review of scientific instruments Pub Date : 2022-11-01 DOI: 10.1063/5.0105279

Jianpeng Gao, Liang Sheng, Baojun Duan, Xinyi Wang, Dongwei Hei, Huaibi Chen

{"title":"Three-dimensional iterative reconstruction of pulsed radiation sources using spherical harmonic decomposition.","authors":"Jianpeng Gao, Liang Sheng, Baojun Duan, Xinyi Wang, Dongwei Hei, Huaibi Chen","doi":"10.1063/5.0105279","DOIUrl":"https://doi.org/10.1063/5.0105279","url":null,"abstract":"Neutron and x-ray imaging are essential ways to diagnose a pulsed radiation source. The three-dimensional (3D) intensity distribution reconstructed from two-dimensional (2D) radiation images can significantly promote research regarding the generation and variation mechanisms of pulsed radiation sources. Only a few (≤5) projected images at one moment are available due to the difficulty in building imaging systems for high-radiation-intensity and short-pulsed sources. The reconstruction of a 3D source with a minimal number of 2D images is an ill-posed problem that leads to severe structural distortions and artifacts of the image reconstructed by conventional algorithms. In this paper, we present an iterative method to reconstruct a 3D source using spherical harmonic decomposition. Our algorithm improves the representation ability of spherical harmonic decomposition for 3D sources by enlarging the order of the expansion, which is limited in current analytical reconstruction algorithms. Prior knowledge of the source can be included to obtain a reasonable solution. Numerical simulations demonstrate that the reconstructed image quality of the iterative algorithm is better than that of the analytical algorithm. The iterative method can suppress the effect of noise in the integral projection image and has better robustness and adaptability than the analytical method.","PeriodicalId":519534,"journal":{"name":"The Review of scientific instruments","volume":" ","pages":"113551"},"PeriodicalIF":1.6,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40459355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A versatile chemical vapor synthesis reactor for in situ x-ray scattering and spectroscopy. 用于现场x射线散射和光谱学的多功能化学蒸汽合成反应器。

IF 1.6

The Review of scientific instruments Pub Date : 2022-11-01 DOI: 10.1063/5.0122461

Martin A Schroer, Alexander Levish, Yasin Yildizlar, Maximilian Stepponat, Markus Winterer

引用次数: 1

Psychological stress recognition from heart rate variability parameters based on field programmable gate arrays. 基于现场可编程门阵列的心率变异性参数的心理应激识别。

IF 1.6

The Review of scientific instruments Pub Date : 2022-11-01 DOI: 10.1063/5.0118630

Jian Wang, Houqin Wang, Yuemei Luo, Hongying Tang, Hongwei Mao, Shubo Bi

{"title":"Psychological stress recognition from heart rate variability parameters based on field programmable gate arrays.","authors":"Jian Wang, Houqin Wang, Yuemei Luo, Hongying Tang, Hongwei Mao, Shubo Bi","doi":"10.1063/5.0118630","DOIUrl":"https://doi.org/10.1063/5.0118630","url":null,"abstract":"Psychological stress is a big threat to people's health. Early detection of psychological stress is important. The design of a stress recognition device based on the ECG (electrocardiograph) signal is presented in this paper. The device features intelligence, precision, portability, fast response, and low power consumption. In the design, the ECG signals are acquired by the AD8232 ECG module and processed by a low power consumption FPGA (Field Programmable Gated Array) development board PYNQ-Z2. Meanwhile, a modified Deep Forest model named Aw-Deep Forest (Adaptive Weight Deep Forest) is proposed. The Aw-Deep Forest has better performance than the Deep Forest model because it improves the fitting quality of the forests. By implementing the Aw-Deep Forest model on the FPGA, the device can assess people's state of psychological stress by analyzing the HRV (heart rate variability) parameters from ECG data. This paper mainly introduces the detailed process of ECG signal collecting, filtering, analog signal to digital signal conversion, HRV parameter analysis, and psychological stress recognition with Aw-Deep Forest. The final accuracy is 81.39%.","PeriodicalId":519534,"journal":{"name":"The Review of scientific instruments","volume":" ","pages":"115107"},"PeriodicalIF":1.6,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40547607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0