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Journal of Physics E: Scientific Instruments最新文献

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Switched multiprobe NMR system for magnetic field mapping 用于磁场测绘的开关多探针核磁共振系统
Journal of Physics E: Scientific Instruments Pub Date : 1989-08-01 DOI: 10.1088/0022-3735/22/8/005
T. Ntoutoume, A. Deguin, C. Lapray, A. Briguet
{"title":"Switched multiprobe NMR system for magnetic field mapping","authors":"T. Ntoutoume, A. Deguin, C. Lapray, A. Briguet","doi":"10.1088/0022-3735/22/8/005","DOIUrl":"https://doi.org/10.1088/0022-3735/22/8/005","url":null,"abstract":"A simple multiprobe NMR system for static magnetic field mapping is described. It uses an array of several (1-10) small RF coils which are spatially displayed in order to facilitate magnetic field analysis. Field plot is automated and details of electronics which control switched acquisitions are given. The shimming of a whole body magnet operating at 0.15 T is performed.","PeriodicalId":16791,"journal":{"name":"Journal of Physics E: Scientific Instruments","volume":"20 1","pages":"557-560"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72811197","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
A three-path ultrasonic flowmeter for small-diameter pipelines 一种用于小直径管道的三路超声流量计
Journal of Physics E: Scientific Instruments Pub Date : 1989-08-01 DOI: 10.1088/0022-3735/22/8/022
G. A. Jackson, J. Gibson, R. Holmes
{"title":"A three-path ultrasonic flowmeter for small-diameter pipelines","authors":"G. A. Jackson, J. Gibson, R. Holmes","doi":"10.1088/0022-3735/22/8/022","DOIUrl":"https://doi.org/10.1088/0022-3735/22/8/022","url":null,"abstract":"An ultrasonic flowmeter has been developed which incorporates a single transmitting transducer and lens system producing a diverging ultrasound beam detected by three widely spaced receiving transducers. This enables measurements to be made with three ultrasound paths in pipelines of relatively small diameter. Volume flow rate is evaluated from measurements of the difference in phase angle between the received signals under 'flow' and 'no-flow' conditions. A separate cross-flow ultrasound system is used to correct measurements for variations in sound velocity with temperature. For fully developed turbulent flow, the measured phase differences are linearly related to flow rate as predicted by theoretical analysis of the system. The meter compares the flow rates derived from the phase-angle differences for three paths. Agreement of all flow rates indicates that fully developed turbulent flow exists, as present during calibration, and a weighted mean flow-rate is determined and displayed. In other cases warning is given that a reliable measurement of the flow rate cannot be made.","PeriodicalId":16791,"journal":{"name":"Journal of Physics E: Scientific Instruments","volume":"104 1","pages":"645-650"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80812395","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: 8
The use of superconducting bolometers for detecting nanosecond heat pulses 利用超导热计探测纳秒热脉冲
Journal of Physics E: Scientific Instruments Pub Date : 1989-08-01 DOI: 10.1088/0022-3735/22/8/009
S. Edwards, H. B. Rani, J. Wigmore
{"title":"The use of superconducting bolometers for detecting nanosecond heat pulses","authors":"S. Edwards, H. B. Rani, J. Wigmore","doi":"10.1088/0022-3735/22/8/009","DOIUrl":"https://doi.org/10.1088/0022-3735/22/8/009","url":null,"abstract":"The authors discuss the use of superconducting edge bolometers for detecting heat pulses in the regime in which pulse lengths are shorter than the bolometer response time. An algorithm is described which enables deconvolution of the observed bolometer signal to give the incident phonon flux. Backscattering data taken on 2 mm sapphire crystals suggest that the method will also be successful in the study of much thinner samples, for example, the 0.5 mm thick wafers used in MBE technology.","PeriodicalId":16791,"journal":{"name":"Journal of Physics E: Scientific Instruments","volume":"14 1","pages":"582-586"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86699346","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: 10
Development of a piezotranslator-based bending device for in situ SEM investigations of high-performance ceramics 基于压电翻译器的高性能陶瓷原位扫描电镜弯曲装置的研制
Journal of Physics E: Scientific Instruments Pub Date : 1989-08-01 DOI: 10.1088/0022-3735/22/8/011
H. Frei, G. Grathwohl
{"title":"Development of a piezotranslator-based bending device for in situ SEM investigations of high-performance ceramics","authors":"H. Frei, G. Grathwohl","doi":"10.1088/0022-3735/22/8/011","DOIUrl":"https://doi.org/10.1088/0022-3735/22/8/011","url":null,"abstract":"A four-point bender for high-strength ceramics is described. Its compact design allows it to be incorporated into the mechanical stage of a commercially produced SEM, without the need for external mechanical feedthroughs. Static, dynamic and cyclic bending operations can be carried out by means of an electronically controlled piezoelectric displacement transducer. Simultaneous SEM observation and force measurement by means of a quartz crystal transducers are also provided. Typical results achieved with advanced ceramics as load-displacement curves and observations of the crack propagation paths are included.","PeriodicalId":16791,"journal":{"name":"Journal of Physics E: Scientific Instruments","volume":"12 1","pages":"589-593"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86679273","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: 13
Electronic balancing of multichannel SQUID magnetometers 多通道SQUID磁强计的电子平衡
Journal of Physics E: Scientific Instruments Pub Date : 1989-08-01 DOI: 10.1088/0022-3735/22/8/006
H. T. Brake, Z. Dunajski, W.A.G. van der Mheen, J. Flokstra
{"title":"Electronic balancing of multichannel SQUID magnetometers","authors":"H. T. Brake, Z. Dunajski, W.A.G. van der Mheen, J. Flokstra","doi":"10.1088/0022-3735/22/8/006","DOIUrl":"https://doi.org/10.1088/0022-3735/22/8/006","url":null,"abstract":"An electronically balanced three-channel SQUID magnetometer is presented. The electronic balancing reduces the imbalance of the gradiometers by at least a factor of 100. The authors realised in this way an imbalance of 10-5, without the necessity of prebalancing by means of superconducting tabs. Details of the design considerations and the construction of the three-channel system are given, focusing especially on the electronic balancing unit. Some illustrating experiments are also described and the possibilities of electronic balancing discussed","PeriodicalId":16791,"journal":{"name":"Journal of Physics E: Scientific Instruments","volume":"12 1","pages":"560-564"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79712905","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: 19
The use of a flat suppressor in low-energy electron diffraction 低能电子衍射中扁平抑制器的应用
Journal of Physics E: Scientific Instruments Pub Date : 1989-08-01 DOI: 10.1088/0022-3735/22/8/023
R. D. Diehl, S. Chandavarkar
{"title":"The use of a flat suppressor in low-energy electron diffraction","authors":"R. D. Diehl, S. Chandavarkar","doi":"10.1088/0022-3735/22/8/023","DOIUrl":"https://doi.org/10.1088/0022-3735/22/8/023","url":null,"abstract":"The authors discuss the advantages of using a flat suppressor in low-energy electron diffraction (LEED). A flat-suppressor system which incorporates a channel electron multiplier plate and a phosphor screen detector is described. The LEED patterns can be analysed using standard lineshape fitting programs. Preliminary results from experiments on the hexagonal incommensurate phase of potassium chemisorbed on Ni(111) are presented.","PeriodicalId":16791,"journal":{"name":"Journal of Physics E: Scientific Instruments","volume":"91 1","pages":"651-656"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84023516","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: 7
Electrical conductivity meter for food samples 食品样品电导率计
Journal of Physics E: Scientific Instruments Pub Date : 1989-08-01 DOI: 10.1088/0022-3735/22/8/004
F. Mitchell, A. Alwis
{"title":"Electrical conductivity meter for food samples","authors":"F. Mitchell, A. Alwis","doi":"10.1088/0022-3735/22/8/004","DOIUrl":"https://doi.org/10.1088/0022-3735/22/8/004","url":null,"abstract":"A description is given of a cell and associated electronic unit suitable for the measurement of the electrical conductivity of foods. Some measured conductivities are reported.","PeriodicalId":16791,"journal":{"name":"Journal of Physics E: Scientific Instruments","volume":"76 1","pages":"554-556"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88091163","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: 40
Estimation of LDA signal frequency using the autocovariance (ACV) lag ratio method 用自协方差(ACV)滞后比法估计LDA信号频率
Journal of Physics E: Scientific Instruments Pub Date : 1989-08-01 DOI: 10.1088/0022-3735/22/8/020
D. Matovic, C. Tropea
{"title":"Estimation of LDA signal frequency using the autocovariance (ACV) lag ratio method","authors":"D. Matovic, C. Tropea","doi":"10.1088/0022-3735/22/8/020","DOIUrl":"https://doi.org/10.1088/0022-3735/22/8/020","url":null,"abstract":"The autocovariance (ACV) lag ratio method of determining the frequency of single realisation LDA signals is introduced and examined in detail. Properties of this method and of the frequency estimator are derived analytically and verified using numerical simulation. The simulation is also used to investigate the performance of the estimator in terms of digitising parameters and to compare the results with an estimate based on the power spectral density. The ACV lag ratio method has been implemented experimentally using a transient recorder to digitise the Doppler signals and an optimised software routine to apply the method. Results from simulated and real Doppler signals show that the ACV lag ratio method maintains high accuracy over a wide effective bandwidth and is robust to the choice of digitising parameters.","PeriodicalId":16791,"journal":{"name":"Journal of Physics E: Scientific Instruments","volume":"76 1","pages":"631-637"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83829726","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: 6
A low-cost magnetic resonance imaging system 一种低成本磁共振成像系统
Journal of Physics E: Scientific Instruments Pub Date : 1989-08-01 DOI: 10.1088/0022-3735/22/8/008
S. Pittard, M. Fry, R. Ellis, E. Moore, W. Vennart
{"title":"A low-cost magnetic resonance imaging system","authors":"S. Pittard, M. Fry, R. Ellis, E. Moore, W. Vennart","doi":"10.1088/0022-3735/22/8/008","DOIUrl":"https://doi.org/10.1088/0022-3735/22/8/008","url":null,"abstract":"The design, construction and performance of a low-cost magnetic resonance imaging (MRI) system is described. The system uses a unique, PC-based, task-oriented multiprocessor design, resulting in a high-performance MRI system able to run most pulse sequences. This type of design could lead to a new generation of low-cost MRI systems with applications in research and teaching.","PeriodicalId":16791,"journal":{"name":"Journal of Physics E: Scientific Instruments","volume":"10 1","pages":"574-582"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88111464","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: 9
Measurement of neutron and proton-induced background in germanium gamma-ray spectrometers for use in a space environment 空间环境中使用的锗伽马射线光谱仪中中子和质子感应本底的测量
Journal of Physics E: Scientific Instruments Pub Date : 1989-08-01 DOI: 10.1088/0022-3735/22/8/013
A. Entwistle, C. Dyer, J. Quenby, A. Evans, M. Joshi
{"title":"Measurement of neutron and proton-induced background in germanium gamma-ray spectrometers for use in a space environment","authors":"A. Entwistle, C. Dyer, J. Quenby, A. Evans, M. Joshi","doi":"10.1088/0022-3735/22/8/013","DOIUrl":"https://doi.org/10.1088/0022-3735/22/8/013","url":null,"abstract":"Particle-induced background in germanium spectrometers used for astrophysical and remote sensing measurement in a space environment provides an important limitation to the ultimate instrument sensitivity. To aid future experimental design and interpretation, laboratory exposure of typical sensors to known fluences of slow and fast neutrons and energetic protons is carried out to predict the line and continuum background components. Fast neutron elastic scatter is found to be the chief source of background below 100 keV for an unshielded detector inside a heavy spacecraft. At higher energies, comparable contributions are identified from neutron inelastic scattering and neutron- and proton-induced radioactivity. Radiation damage to an n-type high purity Ge detector caused broadening in resolution by a factor of 1.8 after subjection to 1.2*1010 protons of 600 MeV.","PeriodicalId":16791,"journal":{"name":"Journal of Physics E: Scientific Instruments","volume":"55 1","pages":"601-611"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79648666","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
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