IEEE Transactions on Instrumentation and Measurement
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Volume 26 Issue 2 • June 1977
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Previous Titles
- ( 1955 - 1962 ) IRE Transactions on Instrumentation
- ( 1952 - 1954 ) Transactions of the IRE Professional Group on Instrumentation
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A Noise Doubling Radiometer for the Absolute Calibration of High-Frequency Noise Sources
Publication Year: 1977, Page(s):85 - 87
Cited by: Papers (2)A switching type radiometer is described in which the comparison of the standard and the unknown noise sources is performed without the physical disconnection of any of the sources. This ensures that no impedance change takes place in the relatively wide frequency band of the measurement. Thus reception of the 'reverse radiation' of the receiver reflected back into the receiver remains constant du... View full abstract»
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Video Detection and Tracking of Tracer Particles in a Model Packed-Bed Reactor
Jerry L. Stephenson ; James A. Wiedenhoeft ; James R. Vallino ; Jon D. Warden ; Philip J. Brulla ; Leo JedynakPublication Year: 1977, Page(s):88 - 91
Cited by: Papers (4)A video detection and tracking system was devised to track and record the position versus time of tracer particles moving through a transparent medium. The system was applied to studying the flow-related transport phenomena at all points within packed-bed reactors since the previously proposed mathematical models for describing them have not been proven adequate thoughout the entire packed-bed. A ... View full abstract»
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Relative Sensitivity Improvement in Side Wall Moving Vane Type Microwave Power Meter
Publication Year: 1977, Page(s):92 - 95Relatively sensitive power measuring device based on radiation pressure on the waveguide wall has been developed. The sensitivity is increased by placing a piece of ferrite on a pressure plate in a window cut through the wall of a rectangular waveguide. View full abstract»
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Microwave Properties of Yarns and Textiles Using a Resonant Microwave Cavity
Publication Year: 1977, Page(s):95 - 98
Cited by: Papers (8)Modified cavity perturbation methods for permittivity measurements of yarn and textile are described. A cylindrical cavity which is split into equal parts is designed to operate in the TE011 mode. The dielectric yarn is placed across the midplane of the cavity and a textile sample is placed in the cavity on a low-loss dielectric sheet in annular form. The shift in the resonant frequency and change... View full abstract»
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Phase and Amplitude Modulation Effects in a Phase Detector Using an Incorrectly Balanced Mixer
Publication Year: 1977, Page(s):98 - 102
Cited by: Papers (11)A very simple theoretical model of a phase detector using a double-or single-balanced mixer is described. The main characteristics of this device are depicted and the effect of the balance in the mixer is analyzed. Experiments show that the model describes the behavior of the unbalanced phase detector in a satisfactory way. View full abstract»
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Light-Coupled Impulse-Peak Detector Using Pulse-Lengthener Circuit
Publication Year: 1977, Page(s):103 - 104An improved light-coupled impulse-peak detector has been developed employing a pulse-lengthener circuit in place of a wide-band oscilloscope used in the conventional peak detector. Besides advantages in equipment simplification and economy, the present peak detector permits precise measurements of the peak voltage of an impulse as narrow as 12 ns with a peak voltage range from +0.3 to +4.5 V. View full abstract»
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An Optoelectronic Switch for Low-Level Analog Applications
Publication Year: 1977, Page(s):105 - 109
Cited by: Papers (1)This paper discusses characteristics and applications of an analog switch based upon the back-to-back connection of two light-emitter/phototransistor assemblies, with an original method of zeroing the offset voltage. The resulting device is thoroughly analyzed, and it is shown how this solid-state switch is comparable in accuracy with electromechanical relays, but it has much higher repetition-rat... View full abstract»
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Stochastic Perturbation Model for Optimal Position Transfer Characteristic
Publication Year: 1977, Page(s):109 - 112
Cited by: Papers (1)An analytic model describing the transfer properties of a discrete photosensitive element position detection system is developed. Improvement of the inherently nonlinear transfer characteristic is shown to be possible when the target is subject to perturbation in the form of Gaussian noise. Applying a spline function approximation approach, relationship between the element threshold, noise varianc... View full abstract»
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High-Resolution Shaft Speed Measurements Using a Microcomputer
Publication Year: 1977, Page(s):113 - 116
Cited by: Papers (3)A Motorola 6800 microcomputer has been applied to the measurement of instantaneous angular velocity at one degree intervals on a pair of coupled shafts. Velocity is determined by accurately measuring the time intervals between pulses produced by shaft encoders. Variations in relative velocity can be detected when precision timing is available. Using an essentially software approach time can be mea... View full abstract»
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High-Voltage High-Frequency Damped Sinewave Pulser for EMP Simulation
Publication Year: 1977, Page(s):116 - 119A damped sinusoidal waveform can be generated by a simple series RLC ringing circuit. However, for high frequency (≳50 MHz) oscillation, it is extremely difficult to achieve a smooth output waveform for a given Q and R. This is mainly because very little energy can be initially stored in the capacitor C to maintain the ringing through the switch gap. To solve this problem, many identical p... View full abstract»
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A New Technique for the Direct Measurement of Y-Parameters at Microwave Frequencies
Publication Year: 1977, Page(s):119 - 123
Cited by: Papers (1) | Patents (1)A technique has been developed which makes practical the direct measurement of active device two-port y-parameters at microwave frequencies. The instrumentation involved is a simple modification of a conventional s-parameter test set, and the measurement procedure is only slightly more complicated than in a conventional s parameter measurement. View full abstract»
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A New Method for Measuring the Electrical Properties of Sea Water and Wet Earth at Microwave Frequencies
Publication Year: 1977, Page(s):124 - 127
Cited by: Papers (2) | Patents (3)By replacing the outer conductor of a section of 50-Ω coaxial line with a conductive material, the complex permittivity (dielectric constant and conductivity) of the material is determined from calculations based upon attenuation and phase shift measurements. The method is most accurate for materials with loss tangent greater than about 0.1 and conductivity around 1 mho/m or greater, such ... View full abstract»
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Spectral Analysis of Synthesized Signals in the mm Wavelength Region
Publication Year: 1977, Page(s):128 - 132
Cited by: Papers (10)In this paper some experimental results on the spectral purity along a multiplier chain from 5 MHz up to 600 GHz are reported. The measured points are compared to the numerical data which can be obtained from simple calculations considering the phase noise spectrum of the crystal oscillators used to drive the multiplier chains. View full abstract»
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A Linear Position Transducer Using a Magnet and Hall Effect Devices
Publication Year: 1977, Page(s):133 - 136
Cited by: Papers (11) | Patents (1)Magnets and magnetic field sensing devices are often attractive in instrumentation because they are noncontacting, small, and independent of the media's dielectric constant. The nonlinearity of the magnetic field with distance is a problem, however. A circuit to remove this nonlinearity and also to reduce the effective temperature coefficient is described. The circuit is used in a clinical dental ... View full abstract»
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A Guided Radar System for Obstacle Detection
Publication Year: 1977, Page(s):137 - 143
Cited by: Papers (10)This paper describes the operation of a guided radar system capable of detecting human targets or other obstacles along a guideway at ranges up to a quarter of a mile. The concept is based on the use of so-called leaky coaxial cables which were first developed for the communications field. Two cables, installed on either side of the guideway, act as the medium of propagation in the form of a surfa... View full abstract»
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A Glass-Microelectrode Probe with Built-In Characterizing Capability
Publication Year: 1977, Page(s):143 - 147
Cited by: Patents (1)An instrument to characterize glass-microelectrode equivalent-circuit parameters is described. The same amplifier performs the measuring system characterization and works as a voltage follower for intracellular potential measurements. With this solution no change occurs in the system parameters when it performs the characterization, or does the measurement in order to get the microelectrode equiva... View full abstract»
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Small Moisture Content Measurements for Nylon Chip and Granulated Sugar by Dielectric Loss Method
Publication Year: 1977, Page(s):148 - 152
Cited by: Papers (1) | Patents (1)A moisture-content measuring device operating on the dielectric loss measurement principle has been developed. The device can measure the moisture content in the range of 0.1-1.5 percent consistently for the nylon chip and the granulated sugar. View full abstract»
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A Picosecond Timing System
Publication Year: 1977, Page(s):153 - 157
Cited by: Papers (1)Subnanosecond resolution is possible in time interval measurement using the vernier principle. Such a timing system is described which is capable of resolving events occurring within a 12 ns interval to an accuracy better than 50 ps. Factors limiting resolution have been identified and their effect quantified. View full abstract»
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Sensitive Microwave Spectrometer Using MW Double Resonance Modulation and Two Confocal Open Resonators
Publication Year: 1977, Page(s):157 - 164
Cited by: Papers (1)One of the major sensitivity limitations common to most microwave (MW) cavity spectrometers is due to the difficulty of introducing an effective modulation into a large cavity without degrading the MW characteristics. The described MW/MW double resonance spectrometer operating with two open resonators and a travelling wave amplifier appears to be a promising solution. The means used to obtain a go... View full abstract»
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Application of the Multiharmonic Fourier Filter to Nonlinear System Fault Location
Publication Year: 1977, Page(s):164 - 169
Cited by: Papers (6)The Fourier Response Analyser (FRA) has become a widely used and accepted instrument with clearly defined noise and harmonic rejection characteristics. In a nonlinear system, however, the higher harmonics contain useful information on the system under test which this paper shows can be used by the test designer to assess system quality and pinpoint nonlinear fault locations if the system is classi... View full abstract»
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On-Line Phase Measurement of Power System Harmonics
Publication Year: 1977, Page(s):170 - 175
Cited by: Papers (6)A new instrument which allows on-line measurements of the phase angle of harmonics is presented. It is used in conjunction with a wave analyzer and provides amplitude and phase angle of harmonics. The principle of the measurement is an analogue null detection, hence the accuracy depends practically only on the quality of the tuned voltmeter used. Direct digital read out is provided for the angle. ... View full abstract»
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An All Digital Automated Wind Measurement System
Publication Year: 1977, Page(s):175 - 180In addition to supplying basic meteorological information, vectored wind velocity measurements are essential to the analysis of small caliber ballistic trajectories, optical wave propagation in the lower atmosphere, and wind shears and vorticies. Conventional electromechanical methods, using velocity-to-direct current converters, are often unsatisfactory when integrated into a multisensor array ov... View full abstract»
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A Digital Method of Frequency Multiplication and Its Application to Numeric Spectrum Analysis of Periodic Signals
Publication Year: 1977, Page(s):181 - 183
Cited by: Papers (5) | Patents (1)A digital way to produce an integral multiple of the frequency of periodic trigger pulses is described. This procedure is used to generate the sampling pulses for the ADC of a time-series analyzer. The device which implements this method is called sampling frequency generator (SFG). A comparison is made between this digital method and the analog frequency multiplication method by means of a PLL. View full abstract»
Aims & Scope
Papers are sought that address innovative solutions to the development and use of electrical and electronic instruments and equipment to measure, monitor and/or record physical phenomena for the purpose of advancing measurement science, methods, functionality and applications.
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