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6th IEEE Conference Record., Instrumentation and Measurement Technology Conference最新文献

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A low-lossy double tuned resonator for concurrent /sup 1/H and /sup 31/P nuclear magnetic resonance 用于并发/sup 1/H和/sup 31/P核磁共振的低损耗双调谐谐振器
6th IEEE Conference Record., Instrumentation and Measurement Technology Conference Pub Date : 1989-04-25 DOI: 10.1109/IMTC.1989.36849
G. Annaert, A. Barel, R. Luypaert, M. Osteaux, J. Renneboog
{"title":"A low-lossy double tuned resonator for concurrent /sup 1/H and /sup 31/P nuclear magnetic resonance","authors":"G. Annaert, A. Barel, R. Luypaert, M. Osteaux, J. Renneboog","doi":"10.1109/IMTC.1989.36849","DOIUrl":"https://doi.org/10.1109/IMTC.1989.36849","url":null,"abstract":"A novel method for double tuning a single nuclear magnetic resonance (NMR) probe, providing two resonances to a single output, simultaneously is described. Both frequencies provide a high sensitivity and are easily tuned with special noninteracting frequency-decoupling circuits. The /sup 1/H (proton) imaging mode of the double-tuned surface coil is actively decoupled from the whole-body, circularly polarized transmit resonator by activating a pin diode circuit. Results for a phantom containing both water and phosphorus acid are shown.<<ETX>>","PeriodicalId":298343,"journal":{"name":"6th IEEE Conference Record., Instrumentation and Measurement Technology Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130103954","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 50 MHz microcomputer-based data acquisition and analysis system for ultrasound tissue characterization 基于50 MHz微电脑的超声组织表征数据采集与分析系统
6th IEEE Conference Record., Instrumentation and Measurement Technology Conference Pub Date : 1989-04-25 DOI: 10.1109/IMTC.1989.36847
N. Botros, K. Xu
{"title":"A 50 MHz microcomputer-based data acquisition and analysis system for ultrasound tissue characterization","authors":"N. Botros, K. Xu","doi":"10.1109/IMTC.1989.36847","DOIUrl":"https://doi.org/10.1109/IMTC.1989.36847","url":null,"abstract":"The authors present an ultra-high-speed microcomputer-based data acquisition and analysis system to be coupled to an ultrasound scanner machine. The primary application of the system described is to measure the backscattered ultrasound energy from human liver tissue and use this measurement to differentiate between normal and abnormal liver tissue. The system digitizes the ultrasound signal with a sample rate of 50 megasamples/second and stores the digitized data in an intermediate storage. When the storage is full, the data are transferred to an IBM-PC where a fast Fourier transform algorithm is applied to calculate the power spectrum of the ultrasound signal. The measurement of the power spectrum is used to estimate the acoustic attenuation and backscattering coefficients of the tissue as function of the frequency. By investigating these coefficients, the biological status of the tissue (normal or abnormal) can be determined. The six main system components are described in some detail: the conditioning circuit, the analog/digital converter unit, the latching circuit unit, the intermediate storage unit, the communication unit, and the control-delay circuit unit.<<ETX>>","PeriodicalId":298343,"journal":{"name":"6th IEEE Conference Record., Instrumentation and Measurement Technology Conference","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129515002","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
An introduction to Hadamard spectrometry and the multiplex advantage 介绍了阿达玛光谱法及其多路复用优势
6th IEEE Conference Record., Instrumentation and Measurement Technology Conference Pub Date : 1989-04-25 DOI: 10.1109/IMTC.1989.36899
B. Harms, R. Dyer, S. Dyer, T. W. Johnson, J.B. Park
{"title":"An introduction to Hadamard spectrometry and the multiplex advantage","authors":"B. Harms, R. Dyer, S. Dyer, T. W. Johnson, J.B. Park","doi":"10.1109/IMTC.1989.36899","DOIUrl":"https://doi.org/10.1109/IMTC.1989.36899","url":null,"abstract":"The authors consider a special class of problems in which the dominant noise source in the spectrum measurements is the noise generated in the detector itself. In this case, the signal-to-noise ratio of the spectrum estimates can be improved by a multiplexing technique known as Hadamard spectrometry. Specifically, if the MSE (mean-square error) of a single-slit spectrometer is sigma /sup 2/, the MSE of a Hadamard system will be approximately 4/ sigma /sup 2//N. In this expression, N is the number of spectral components to be estimated and the number of measurements to be taken.<<ETX>>","PeriodicalId":298343,"journal":{"name":"6th IEEE Conference Record., Instrumentation and Measurement Technology Conference","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117323382","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: 12
Recent developments in digital oscilloscopes 数字示波器的最新发展
6th IEEE Conference Record., Instrumentation and Measurement Technology Conference Pub Date : 1989-04-25 DOI: 10.1109/IMTC.1989.36840
H.K. Schoenwetter
{"title":"Recent developments in digital oscilloscopes","authors":"H.K. Schoenwetter","doi":"10.1109/IMTC.1989.36840","DOIUrl":"https://doi.org/10.1109/IMTC.1989.36840","url":null,"abstract":"The author reviews the latest developments in digital storage oscilloscopes (DSOs) as reported in the literature. DSOs are used to digitize and store waveforms, which can be compared, analyzed, and manipulated. DSO capabilities usually include programmability, automatic waveform parameter measurement, display of pretrigger signal activity, and waveform averaging to reduce noise and ripple. Three methods of sampling used in DSOs are described: real-time, sequential equivalent-time (ET), and random ET.<<ETX>>","PeriodicalId":298343,"journal":{"name":"6th IEEE Conference Record., Instrumentation and Measurement Technology Conference","volume":"266 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114449782","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
Superfluid helium tanker instrumentation 超流氦罐仪器
6th IEEE Conference Record., Instrumentation and Measurement Technology Conference Pub Date : 1989-04-25 DOI: 10.1109/IMTC.1989.36888
C. Woodhouse, A. Kashani, A. Lukemire
{"title":"Superfluid helium tanker instrumentation","authors":"C. Woodhouse, A. Kashani, A. Lukemire","doi":"10.1109/IMTC.1989.36888","DOIUrl":"https://doi.org/10.1109/IMTC.1989.36888","url":null,"abstract":"An instrumentation system for a 1992 Space Shuttle flight demonstration of superfluid-helium tanker and transfer technology is presented. The system measures helium temperatures, pressures, flow rates and mass and the amount of liquid or vapor present. It consists of analog and digital portions which provide a fault-tolerant, compact, relatively lightweight, space-qualified electronics system. The data-processing hardware and software are ground-commandable, perform measurements asynchronously, and format telemetry for transmission to the ground. A novel heat-pulse mass gaging technique is described, and a new liquid/vapor sensor is presented. Flowmeters for superfluid helium are discussed, and the superfluid helium fountain effect pump is described. Results of tests to date are presented.<<ETX>>","PeriodicalId":298343,"journal":{"name":"6th IEEE Conference Record., Instrumentation and Measurement Technology Conference","volume":"1037 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116270123","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
Ultra-black nickel-phosphorus alloy optical absorber 超黑镍磷合金光学吸收器
6th IEEE Conference Record., Instrumentation and Measurement Technology Conference Pub Date : 1989-04-25 DOI: 10.1109/IMTC.1989.36909
S. Kodama, M. Horiuchi, K. Kuroda, T. Kunii
{"title":"Ultra-black nickel-phosphorus alloy optical absorber","authors":"S. Kodama, M. Horiuchi, K. Kuroda, T. Kunii","doi":"10.1109/IMTC.1989.36909","DOIUrl":"https://doi.org/10.1109/IMTC.1989.36909","url":null,"abstract":"In order to develop an optical absorber for use in the measurement of optical power, the authors investigated and evaluated ultra-black films of nickel-phosphorus alloy, which were plated and etched on substrates using an electroless plating process. The plating and etching bath components and conditions were examined. The spectral reflectances and surface morphologies of the films were measured precisely. An optical absorber with a spectral reflectance of about 0.1% to 0.2% and a low wavelength dependence in the wavelength range of 488 to 1550 nm has been developed. The absorber was exposed to two accelerated-aging environments: (a) 2000 hours in a dry (1% to 2% relative humidity) environment at 100 degrees C, and (b) 2000 hours in a damp (85% relative humidity) environment at 85 degrees C. After exposure (a), the spectral reflectance of the absorber increased slightly, but it retained an excellent level of 0.18% to 0.23% in the upper wavelength range. After exposure (b), the spectral reflectance and wavelength dependence showed almost no change.<<ETX>>","PeriodicalId":298343,"journal":{"name":"6th IEEE Conference Record., Instrumentation and Measurement Technology Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116547318","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: 48
Establishment of math-model and analysis of interpolation accuracy on 1-GPa manganin resistance gauges 1-GPa锰电阻计数学模型的建立及插值精度分析
6th IEEE Conference Record., Instrumentation and Measurement Technology Conference Pub Date : 1989-04-25 DOI: 10.1109/IMTC.1989.36922
T. Yuan, Yan-Chong Lu, Bao-Hui Yuan
{"title":"Establishment of math-model and analysis of interpolation accuracy on 1-GPa manganin resistance gauges","authors":"T. Yuan, Yan-Chong Lu, Bao-Hui Yuan","doi":"10.1109/IMTC.1989.36922","DOIUrl":"https://doi.org/10.1109/IMTC.1989.36922","url":null,"abstract":"The high-static-pressure metrological characteristics of 1-GPa manganin resistance gauges are investigated. Nonlinearity is measured by means of a secondary standard-free piston gauge. A second-order mathematical-model is established, with an interpolation accuracy reaching 0.07%, as verified by calibration tests. The results obtained indicate that manganin resistance gauges exhibit very good stability, repeatability, and reproducibility.<<ETX>>","PeriodicalId":298343,"journal":{"name":"6th IEEE Conference Record., Instrumentation and Measurement Technology Conference","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123261080","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 computer controlled 300 kV pulse generator 一台计算机控制的300千伏脉冲发生器
6th IEEE Conference Record., Instrumentation and Measurement Technology Conference Pub Date : 1989-04-25 DOI: 10.1109/IMTC.1989.36844
S. Kupferman, S. R. Booker, H. Meissner
{"title":"A computer controlled 300 kV pulse generator","authors":"S. Kupferman, S. R. Booker, H. Meissner","doi":"10.1109/IMTC.1989.36844","DOIUrl":"https://doi.org/10.1109/IMTC.1989.36844","url":null,"abstract":"A high-voltage pulse generator used primarily for calibrating precision high-voltage dividers has been redesigned and rebuilt for state-of-the-art operation. It now has the capability to run a divider calibration, compare the results with historical data for the divider, and then print a calibration certificate, all under computer control. Thirteen component instruments are controlled through three IEEE 488 buses. A voice synthesizer is used to inform the operator of the progress of the calibration. Measurement precision is in the 0.1% range. A heat exchanger is used to control the temperature of the oil bath to allow calibration of dividers between 13 degrees C and 21 degrees C. Positive or negative pulse polarity can be selected, and pulse magnitude is settable from less than 10 kV to greater than 300 kV.<<ETX>>","PeriodicalId":298343,"journal":{"name":"6th IEEE Conference Record., Instrumentation and Measurement Technology Conference","volume":"85 2-3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132186925","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
A high-sensitivity phantom-implantable E-field probe for studies in bioelectromagnetics 用于生物电磁学研究的高灵敏度幻影植入式电场探针
6th IEEE Conference Record., Instrumentation and Measurement Technology Conference Pub Date : 1989-04-25 DOI: 10.1109/IMTC.1989.36886
R. Olsen, P. Neelakanta
{"title":"A high-sensitivity phantom-implantable E-field probe for studies in bioelectromagnetics","authors":"R. Olsen, P. Neelakanta","doi":"10.1109/IMTC.1989.36886","DOIUrl":"https://doi.org/10.1109/IMTC.1989.36886","url":null,"abstract":"The authors address the design, development, and evaluation of a high-sensitivity RF sensor that is useful in measuring specific absorption rate (SAR) that occurs when a full-size human phantom is exposed to radio-frequency (RF) radiation. The probe consists of a small dipole connected to a zero-bias Schottky diode. The detected and filtered DC signal is preamplified and applied to a voltage-controlled oscillator (VCO). The VCO output is transmitted to a receiver by a fiber-optic link. The preamplifier and VCO use very-low-power devices which permit minimum battery drain. The zero-bias detector has a near-zero cut-in (forward) voltage and detects low-level field intensities. The fiber-optic link eliminates RF interference, and the relatively small diameter of the probe permits determination of localized SAR in phantom models. Details concerning prototype development and testing are presented. Initial evaluation of the probe indicated a VCO frequency shift of 1.0 kHz for an internal 29.9-MHz electromagnetic-field intensity of approximately 82 V/m.<<ETX>>","PeriodicalId":298343,"journal":{"name":"6th IEEE Conference Record., Instrumentation and Measurement Technology Conference","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130430782","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
When 12-dB SINAD is not 12-dB SINAD (land mobile FM receivers) 当12db SINAD不是12db SINAD时(陆地移动调频接收机)
6th IEEE Conference Record., Instrumentation and Measurement Technology Conference Pub Date : 1989-04-25 DOI: 10.1109/IMTC.1989.36911
L. T. Jones
{"title":"When 12-dB SINAD is not 12-dB SINAD (land mobile FM receivers)","authors":"L. T. Jones","doi":"10.1109/IMTC.1989.36911","DOIUrl":"https://doi.org/10.1109/IMTC.1989.36911","url":null,"abstract":"12-dB SINAD (signal plus noise plus distortion to noise plus distortion ratio) is the standard measure of analog FM receiver sensitivity. The Electronics Industries Association (EIA) modified its standard for FM receivers in 1982. In this updated standard, the EIA changed the specifications for equipment used to measure SINAD. This change effectively changed the definition of 12-dB SINAD. The author examines the extent of the change and its effect on FM receiver measurements.<<ETX>>","PeriodicalId":298343,"journal":{"name":"6th IEEE Conference Record., Instrumentation and Measurement Technology Conference","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131222616","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
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