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# IEEE Transactions on Instrumentation and Measurement

## Filter Results

Displaying Results 1 - 25 of 28
• ### 3D range acquisition through differential light absorption

Publication Year: 1992, Page(s):622 - 628
Cited by:  Papers (1)
| | PDF (627 KB)

A 3D camera based on the differential absorption of light by a colored liquid is described. The range image is obtained from two illuminance images taken at two different wavelengths. The theoretical aspects of range-from-absorption are discussed in detail. Practical considerations for the calibration and implementation of the method are also covered. The accuracy of the 3D camera is discussed, an... View full abstract»

• ### Comments on "A new minimum component active-C OTA-based linear voltage (current) controlled sinusoidal oscillator by M.T. Abuelma-atti

Publication Year: 1992
| | PDF (44 KB)

The commenter notes that by equating the real and imaginary parts of (3) to zero, the author of the above-titled paper (ibid., vol.39, p.795-7, Oct. 1990) obtains the frequency and condition of oscillation (4) and (5). He points out that as a result, (5) implies that g cannot be varied if G/sub 2/ is a fixed quantity, therefore negating (6)-(8). He proposes instead to find the roots of the charact... View full abstract»

• ### Light-induced transmission changes in liquid crystal displays for adaptive pattern projection

Publication Year: 1992, Page(s):629 - 632
Cited by:  Papers (3)  |  Patents (4)
| | PDF (372 KB)

The changes in the transmission and contrast properties of a super-twisted nematic liquid crystal display panel, induced by the light impinging on the panel itself, have been studied. Upon illumination by laser radiation with power density close to that used in practice, the transmittance of the panel increases or decreases according to the brightness voltage that sets the transmittance level. The... View full abstract»

• ### An automated thermocouple calibration system

Publication Year: 1992, Page(s):702 - 706
Cited by:  Papers (2)
| | PDF (496 KB)

An automated thermocouple calibration system (ATCS) was developed for the unattended calibration of type-K thermocouples. This system operates from room temperature to 650°C and has been used for calibration of thermocouples in an eight-zone furnace system which may employ as many as 60 thermocouples simultaneously. It is highly efficient, allowing for the calibration of large numbers of therm... View full abstract»

• ### Electrical measurement of the junction temperature of an RF power transistor

Publication Year: 1992, Page(s):663 - 665
Cited by:  Papers (13)
| | PDF (240 KB)

An enhanced electrical method is presented for measuring the average junction temperature of an RF bipolar transistor. A two-step procedure, previously developed for DC operation, is extended to include the junction temperature measurement for an RF power transistor in a tuned amplifier circuit. The measurement technique is convenient, since it can be used with normal, packaged devices, and does n... View full abstract»

• ### A stand-alone ultrasonic ranging system for hydrological water stage measurements

Publication Year: 1992, Page(s):699 - 702
Cited by:  Papers (5)
| | PDF (340 KB)

A stand-alone ultrasonic ranging system (SAURS) was designed and applied in hydrological measurements of water levels. Ranging is carried out through air by an electrostatic ultrasonic transducer which is controlled by a microprocessor-based system. The data are collected in a 64-kbyte EPROM cassette. The problems associated with temperature correction were studied theoretically and experimentally... View full abstract»

• ### Distance determination by the gamma-ray time-of-flight method

Publication Year: 1992, Page(s):616 - 621
Cited by:  Papers (4)
| | PDF (364 KB)

The time-of-flight method is studied using coincident annihilation gamma rays with an energy of 511 keV to find the distance from a surface at which they are scattered back for detection. The gamma rays have a good penetration ability, which makes the method suitable for industrial circumstances in which the range is rendered opaque to light by flue gas and aerosols. An accuracy of 1 cm over a dis... View full abstract»

• ### An improved detector scheme for nondestructive reverse bias safe operating area test systems

Publication Year: 1992, Page(s):657 - 662
Cited by:  Patents (1)
| | PDF (540 KB)

An enhanced second-breakdown detector for a nondestructive reverse bias safe operating area test system has been developed. The detector corrects the previously reported deficiencies in the original detector. In addition, the enhancements to the detector can detect a new second-breakdown waveform that had not previously been identified View full abstract»

• ### True RC integrators based on current conveyors with tunable time constants using active control and modified loop technique

Publication Year: 1992, Page(s):709 - 714
Cited by:  Papers (14)
| | PDF (348 KB)

Three active integrator schemes with tunable time constants are presented. The second generation current conveyors (CCIIs) are used as active devices to achieve better frequency responses than that of operational amplifiers. The first scheme uses a capacitance multiplication technique for time constant control; the second uses an enhanced negative resistor to increase the time constant; and the la... View full abstract»

• ### An improved technique for circuit board interconnect test

Publication Year: 1992, Page(s):692 - 698
Cited by:  Papers (7)  |  Patents (2)
| | PDF (572 KB)

The author reviews the self-test features of the IBM RISC System/6000 processor circuit board. Based on this, a technique is described to automate the interconnect wiring test, which is performed as part of the power-on self-test (POST) at the manufacturing stage. Essential to the implementation is the idea of response compression using the multiple input signature registers (MISR). Interconnect w... View full abstract»

• ### Performance of a drag transducer under simulated PWR refill/reflood flow conditions

Publication Year: 1992, Page(s):611 - 615
| | PDF (592 KB)

A strain gage-based drag transducer developed to measure two-phase flow in simulated PWR (pressurized-water reactor) test facilities is discussed. The drag sensor was designed to sample a large amount of the flow with minimum disturbance to the flow, to be sensitive over a 1000-to-1 range, to be accurate over a 200:1 turndown ratio, and to survive in a hostile steam/water environment. The drag tra... View full abstract»

• ### Quotient circuits employing VVR

Publication Year: 1992, Page(s):679 - 684
Cited by:  Papers (6)
| | PDF (384 KB)

The addition of two fixed resistors to a recently proposed, inexpensive quotient circuit based on the voltage variable resistance (VVR) property of an FET is shown to improve the dynamic range of operation. A model for both the original and final circuits is provided which shows that the circuits can have an all-pass behavior when operated in the neighborhood of certain denominator voltages. The n... View full abstract»

• ### A low-frequency duty-cycle dependent sinusoidal oscillator

Publication Year: 1992, Page(s):720 - 722
| | PDF (140 KB)

An oscillator circuit which incorporates periodically operated switches is presented. The circuit is a modified feedback oscillator consisting of two integrators and an inverter, in which a switch has been put in series with each capacitor. By varying the pulse-switching frequency, the frequency of sinewave oscillations can be proportionally varied over a wide low-frequency range which covers six ... View full abstract»

• ### Testing methodologies for analog-to-digital converters

Publication Year: 1992, Page(s):595 - 603
Cited by:  Papers (15)
| | PDF (708 KB)

A theoretical approach and an experimental test system devoted to introducing a set of parameters based on Walsh functions and conformed to characterize the transfer function of analog-to-digital converters are presented. Building on the previous work, the authors propose an enhanced system that provides better accuracy in the evaluation of the performance of conversion devices under dynamic condi... View full abstract»

• ### Long-term propagation delay characteristics of telecommunication lines

Publication Year: 1992, Page(s):653 - 656
Cited by:  Papers (7)
| | PDF (336 KB)

The variations in outgoing path delay and incoming delay of a paired transmission path have been measured simultaneously and independently for over one year. The characteristics will allow the performance of delay compensation schemes for precise time synchronization of digital telecommunication networks to be evaluated. The annual delay variation is caused by temperature changes, and its magnitud... View full abstract»

• ### A PC-based tissue classification system using artificial neural networks

Publication Year: 1992, Page(s):633 - 638
Cited by:  Papers (8)
| | PDF (548 KB)

The author presents a pattern recognition algorithm and describes required instrumentation for ultrasound classification of simulated human-liver tissue abnormalities. The tissue is simulated by a liver phantom that mimics the tissue acoustically. The instrumentation used, a 50-MHz microcomputer-based data acquisition and analysis system designed by the author, digitizes the ultrasound backscatter... View full abstract»

• ### An integrated PC-based system for measurement of various parameters for two-terminal devices used in the industry

Publication Year: 1992, Page(s):706 - 709
| | PDF (400 KB)

A PC-based system has been designed to measure different parameters and carry out nondestructive accelerated tests for various two-terminal electronic devices used in the industry. This gives an inexpensive, fairly accurate testing method, without manual errors, for measurement, data entry, and analysis. The system software is user friendly for semi-skilled workers and also can be hooked up to a m... View full abstract»

• ### In situ determination of rail track electrical impedance and admittance matrix elements

Publication Year: 1992, Page(s):666 - 673
Cited by:  Papers (7)
| | PDF (468 KB)

A novel differential excitation technique is described for the experimental determination of the elements of rail track impedance and admittance matrices from measurements of rail voltages, and currents on a short, isolated track section. The establishment of a common earth point along the track is unnecessary, although rail breaks and driven earth rods at the feed and remote ends of the test sect... View full abstract»

• ### A new analog voltage sorter

Publication Year: 1992, Page(s):714 - 716
Cited by:  Papers (5)
| | PDF (252 KB)

An analog circuit for comparing and sorting two input voltages is described. Using the circuit as a basic unit, a four-input sorter is designed. A technique to determine which of the four inputs corresponds to (address of the input of) a given output is also presented. The procedure can be extended to design an n-input sorter View full abstract»

• ### Measurements of a deep space station fractional frequency stability to the 10-15 level

Publication Year: 1992, Page(s):577 - 587
Cited by:  Papers (4)
| | PDF (884 KB)

Techniques are presented for measuring the frequency stability of a deep space station that was configured with a new X-band transmitter subsystem to enable high-quality radio science data to be obtained for the gravity wave experiment. The instrument and test procedures for performing frequency stability measurements in the field are described. Test results from measurements made on vari... View full abstract»

• ### Novel detector and difference clock circuits for generator frequency error monitors

Publication Year: 1992, Page(s):685 - 691
Cited by:  Papers (1)
| | PDF (412 KB)

A novel error-free detector circuit which overcomes the problem of error in difference detection is described. In the new design, a detector circuit continuously compares the generator clock and the standard clock. Based on the comparison, it outputs up' or down' count pulses appropriately. The unique features of the difference detector are its absolute zero error in error detection and low cost... View full abstract»

• ### Dielectric material measurement of thin samples at millimeter wavelengths

Publication Year: 1992, Page(s):723 - 725
Cited by:  Papers (16)
| | PDF (228 KB)

Complex permittivity and permeability measurements at millimeter wave frequencies of thin samples (0.12 to 1.0 mm) were obtained. The methodology and considerations for making automated waveguide material measurements of thin samples in the 26.5-GHz to 40-GHz (R-band) frequency range are described. Measurement results for various dielectric materials are included View full abstract»

• ### A method for characterizing waveform recorder errors using the power spectral distribution

Publication Year: 1992, Page(s):604 - 610
Cited by:  Papers (10)
| | PDF (568 KB)

A new approach for analyzing the errors observed in sine wave tests of waveform recorders is presented. The approach involves estimating the power spectral distribution for the residuals observed from a sine wave test. The approach is compared to the more common approach of calculating the Fourier transform of the recorded signal. It is shown that the new approach is easier to interpret quantitati... View full abstract»

• ### A new technique for measuring the constitutive parameters of planar materials

Publication Year: 1992, Page(s):639 - 645
Cited by:  Papers (8)
| | PDF (552 KB)

A technique for measuring the constitutive parameters of materials over a broad range of frequencies is developed. The technique is specifically designed for planar samples. Planar samples can be placed in the measurement fixture without any special preparation; this makes the technique more convenient than other techniques which require that the sample has to be machined to fit into a measurement... View full abstract»

• ### Capacitance-type blade-tip clearance measurement system using a dual amplifier with ramp/DC inputs and integration

Publication Year: 1992, Page(s):674 - 678
Cited by:  Papers (7)  |  Patents (19)
| | PDF (360 KB)

The analysis and prototype results for a dual-amplifier circuit for measuring blade-tip clearance in turbine engines are presented. The capacitance between the blade tip and mounted capacitance electrode within a guard ring of a probe forms one of the feedback elements of an operational amplifier (op amp). The differential equation governing the circuit taking into consideration the nonideal featu... 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.

Full Aims & Scope

## Meet Our Editors

Editor-in-Chief

SHERVIN SHIRMOHAMMADI
School of EECS
University of Ottawa
800 King Edward Ave.
Ottawa, Ontario
K1N 6N5 CANADA
Fax: 613-562-5664
shervin@discover.uottawa.ca