SPIE Commercial + Scientific Sensing and Imaging最新文献_第9页

Fast cooldown coaxial pulse tube microcooler 快速冷却同轴脉冲管微冷却器

SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-05-26 DOI: 10.1117/12.2225327

T. Nast, J. Olson, P. Champagne, E. Roth, G. Kaldas, E. Saito, V. Loung, B. McCay, A. Kenton, C. Dobbins

{"title":"Fast cooldown coaxial pulse tube microcooler","authors":"T. Nast, J. Olson, P. Champagne, E. Roth, G. Kaldas, E. Saito, V. Loung, B. McCay, A. Kenton, C. Dobbins","doi":"10.1117/12.2225327","DOIUrl":"https://doi.org/10.1117/12.2225327","url":null,"abstract":"We report the development and initial testing of the Lockheed Martin first-article, single-stage, compact, coaxial, Fast Cooldown Pulse Tube Microcryocooler (FC-PTM). The new cryocooler supports cooling requirements for emerging large, high operating temperature (105-150K) infrared focal plane array sensors with nominal cooling loads of ~300 mW @105K @293K ambient. This is a sequel development that builds on our inline and coaxial pulse tube microcryocoolers reported at CEC 20137, ICC188,9, and CEC201510. The new FC-PTM and the prior units all share our long life space technology attributes, which typically have 10 year life requirements1. The new prototype microcryocooler builds on the previous development by incorporating cold head design improvements in two key areas: 1) reduced cool-down time and 2) novel repackaging that greatly reduces envelope. The new coldhead and Dewar were significantly redesigned from the earlier versions in order to achieve a cooldown time of 2-3 minutes-- a projected requirement for tactical applications. A design approach was devised to reduce the cold head length from 115mm to 55mm, while at the same time reducing cooldown time. We present new FC-PTM performance test measurements with comparisons to our previous pulse-tube microcryocooler measurements and design predictions. The FC-PTM exhibits attractive small size, volume, weight, power and cost (SWaP-C) features with sufficient cooling capacity over required ambient conditions that apply to an increasing variety of space and tactical applications.","PeriodicalId":299313,"journal":{"name":"SPIE Commercial + Scientific Sensing and Imaging","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121930938","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

Evolution of THz impulse imaging radar to 1550nm photoconductive switches 太赫兹脉冲成像雷达向1550nm光导开关的演变

SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-05-26 DOI: 10.1117/12.2224919

E. Brown, W.-D. Zhang, A. Feldman, T. Harvey, R. Mirin, S. Sung, W. Grundfest, Z. Taylor

引用次数: 0

Advanced terahertz techniques for quality control and counterfeit detection 用于质量控制和伪造检测的先进太赫兹技术

SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-05-26 DOI: 10.1117/12.2228684

Kiarash Ahi, M. Anwar

{"title":"Advanced terahertz techniques for quality control and counterfeit detection","authors":"Kiarash Ahi, M. Anwar","doi":"10.1117/12.2228684","DOIUrl":"https://doi.org/10.1117/12.2228684","url":null,"abstract":"This paper reports our invented methods for detection of counterfeit electronic. These versatile techniques are also handy in quality control applications. Terahertz pulsed laser systems are capable of giving the material characteristics and thus make it possible to distinguish between the materials used in authentic components and their counterfeit clones. Components with material defects can also be distinguished in section in this manner. In this work different refractive indices and absorption coefficients were observed for counterfeit components compared to their authentic counterparts. Existence of unexpected ingredient materials was detected in counterfeit components by Fourier Transform analysis of the transmitted terahertz pulse. Thicknesses of different layers are obtainable by analyzing the reflected terahertz pulse. Existence of unexpected layers is also detectable in this manner. Recycled, sanded and blacktopped counterfeit electronic components were detected as a result of these analyses. Counterfeit ICs with die dislocations were detected by depicting the terahertz raster scanning data in a coordinate plane which gives terahertz images. In the same manner, raster scanning of the reflected pulse gives terahertz images of the surfaces of the components which were used to investigate contaminant materials and sanded points on the surfaces. The results of the later technique, reveals the recycled counterfeit components.","PeriodicalId":299313,"journal":{"name":"SPIE Commercial + Scientific Sensing and Imaging","volume":"12378 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126787835","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: 56

Characterization of electromechanical actuator implemented to phase-shift system applied to a Michelson interferometer 应用于迈克尔逊干涉仪相移系统的机电致动器特性

SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-05-26 DOI: 10.1117/12.2224342

A. Barcelata-Pinzón, C. Meneses Fabián, R. Juarez-Salazar, M. Durán-Sánchez, R. Álvarez-Tamayo, C. Robledo-Sánchez, J. L. Muñoz-Mata, J. F. Casco-Vázquez

引用次数: 0

Handheld THz security imaging 手持太赫兹安全成像

SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-05-26 DOI: 10.1117/12.2224095

I. Duling

引用次数: 1

Formal verification of communication protocols using quantized Horn clauses 使用量化Horn子句的通信协议的正式验证

SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-05-26 DOI: 10.1117/12.2222590

R. Balu

引用次数: 2

Application of a Lyot filter plate in discrete frequency entanglement Lyot滤波板在离散频率纠缠中的应用

SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-05-20 DOI: 10.1117/12.2229368

R. Erdmann, D. Hughes

引用次数: 1

Efficiently heralded silicon ring resonator photon-pair source 高效预示硅环谐振器光子对源

SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-05-19 DOI: 10.1117/12.2223941

J. Steidle, M. Fanto, C. Tison, Zihao Wang, P. Alsing, S. Preble

{"title":"Efficiently heralded silicon ring resonator photon-pair source","authors":"J. Steidle, M. Fanto, C. Tison, Zihao Wang, P. Alsing, S. Preble","doi":"10.1117/12.2223941","DOIUrl":"https://doi.org/10.1117/12.2223941","url":null,"abstract":"Presented here are results on a silicon ring resonator photon pair source with a high heralding efficiency. Previous ring resonator sources suffered from an effective 50% loss because, in order to generate the photons, the pump must be able to couple into the resonator which is an effective loss channel. However, in practice the optical loss of the pump can be traded off for a dramatic increase in heralding efficiency. This research found theoretically that the heralding efficiency should increase by a factor of ∼ 3:75 with a factor of 10 increase in the required pump power. This was demonstrated experimentally by varying the separation (gap) between the input waveguide and the ring while maintaining a constant drop port gap. The ring (R = 18:5μm, W = 500nm, and H = 220nm) was pumped by a tunable laser (λ ≈ 1550nm). The non-degenerate photons, produced via spontaneous four wave mixing, exited the ring and were coupled to fiber upon which they were filtered symmetrically about the pump. Coincidence counts were collected for all possible photon path combinations (through and drop port) and the ratio of the drop port coincidences to the sum of the drop port and cross term coincidences (one photon from the drop port and one from the through port) was calculated. With a 350nm pump waveguide gap (2:33 times larger than the drop port gap) we confirmed our theoretical predictions, with an observed improvement in heralding efficiency by a factor of ∼ 2:61 (96:7% of correlated photons coupled out of the drop port). These results will enable increased photon flux integrated photon sources which can be utilized for high performance quantum computing and communication systems.","PeriodicalId":299313,"journal":{"name":"SPIE Commercial + Scientific Sensing and Imaging","volume":"9873 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129098530","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

Microwave electric field sensing with Rydberg atoms 里德伯原子微波电场传感

SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-05-19 DOI: 10.1117/12.2223059

D. Stack, P. Kunz, D. H. Meyer, N. Solmeyer

{"title":"Microwave electric field sensing with Rydberg atoms","authors":"D. Stack, P. Kunz, D. H. Meyer, N. Solmeyer","doi":"10.1117/12.2223059","DOIUrl":"https://doi.org/10.1117/12.2223059","url":null,"abstract":"Atoms form the basis of precise measurement for many quantities (time, acceleration, rotation, magnetic field, etc.). Measurements of microwave frequency electric fields by traditional methods (i.e. engineered antennas) have limited sensitivity and can be difficult to calibrate properly. Highly-excited (Rydberg) neutral atoms have very large electric-dipole moments and many dipole allowed transitions in the range of 1 - 500 GHz. It is possible to sensitively probe the electric field in this range using the combination of two quantum interference phenomena: electromagnetically induced transparency and the Autler-Townes effect. This technique allows for very sensitive field amplitude, polarization, and sub-wavelength imaging measurements. These quantities can be extracted by measuring properties of a probe laser beam as it passes through a warm rubidium vapor cell. Thus far, Rydberg microwave electrometry has relied upon the absorption of the probe laser. We report on our use of polarization rotation, which corresponds to the real part of the susceptibility, for measuring the properties of microwave frequency electric fields. Our simulations show that when a magnetic field is present and directed along the optical propagation direction a polarization rotation signal exists and can be used for microwave electrometry. One central advantage in using the polarization rotation signal rather than the absorption signal is that common mode laser noise is naturally eliminated leading to a potentially dramatic increase in signal-to-noise ratio.","PeriodicalId":299313,"journal":{"name":"SPIE Commercial + Scientific Sensing and Imaging","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126404090","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: 2

Active quantum walks: a framework for quantum walks with adiabatic quantum evolution 主动量子行走:具有绝热量子演化的量子行走框架

SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-05-19 DOI: 10.1117/12.2228440

Nan Wu, Fangmin Song, Xiangdong Li

引用次数: 0