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Oct 1974

Volume 45, Issue 10, pp. 1199-1298

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Accurately measuring nuclear polarization using a phase sensitive detector

W. H. Potter

Rev. Sci. Instrum. 45, 1288 (1974); http://dx.doi.org/10.1063/1.1686483 (2 pages) | Cited 4 times

Online Publication Date: 11 November 2003

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A method is presented in which the first Fourier component of the resonance absorption signal is obtained with a phase sensitive detector. This method has several advantages when compared to the usual method of detecting the derivative of the absorption signal with a phase sensitive detector.

Construction of an einzel lens capable of high voltage operation

William H. Aberth, Rafael Schnitzer, and Ferdinand C. Engesser

Rev. Sci. Instrum. 45, 1289 (1974); http://dx.doi.org/10.1063/1.1686484 (2 pages) | Cited 1 time

Online Publication Date: 11 November 2003

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Construction details are given for a relatively inexpensive einzel lens capable of high voltage operation.

A gas flow system for esr measurements between 5 and 300 K

A. Reuveni and S. Maniv

Rev. Sci. Instrum. 45, 1290 (1974); http://dx.doi.org/10.1063/1.1686485 (2 pages) | Cited 5 times

Online Publication Date: 11 November 2003

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Standard esr equipment for measurements at liquid helium temperature is used as a base for a gas flow system. The system operates at X and Q bands at temperatures down to 5 K. Temperature control is achieved by regulating the flow rate of the gas. It is stabilized to ±1 K. The helium flow rate required to maintain the lowest temperature is 0.12 liters∕h.

Technique to examine surface features in profile using the SEM

R. T. Woods

Rev. Sci. Instrum. 45, 1292 (1974); http://dx.doi.org/10.1063/1.1686486 (2 pages)

Online Publication Date: 11 November 2003

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A new folded replica technique has been developed to view in profile features at the surface of a solid using the scanning electron microscope (SEM). A thin plastic replica of the surface is made and folded over upon itself. Metal is evaporated onto the surface of the folded replica which is then viewed in the SEM in a direction tangent to the fold. With this technique a portion of a surface can effectively be viewed in a direction parallel to the plane of the surface.

An integration circuit for photodiode single‐pulse energy measurements

Paul P. Dymerski and Robert C. Dunbar

Rev. Sci. Instrum. 45, 1293 (1974); http://dx.doi.org/10.1063/1.1686487 (2 pages)

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A circuit was designed for automatic and repetitive measurement of the light energy (peak area) of submicrosecond laser pulses by direct time integration of the light intensity. DC amplification and sample‐hold circuitry interface the laser output directly to a computer analog input.

An omnidirectional pressure transducer

J. G. Futral and B. P. Verma

Rev. Sci. Instrum. 45, 1294 (1974); http://dx.doi.org/10.1063/1.1686488 (3 pages)

Online Publication Date: 11 November 2003

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Diaphragm type pressure transducers are inadequate in the measurement of pressures in deforming media such as soil, because they are too rigid and uniform pressure application is difficult. The omnidirectional pressure transducer is designed to overcome these shortcomings by encasing a cell in a hollow flexible walled sphere filled with an incompressible liquid.

An internal modification to extend the conductance ranges of the General Radio Company type 1615‐A capacitance bridge

J. R. Addison and P. Stalinski

Rev. Sci. Instrum. 45, 1296 (1974); http://dx.doi.org/10.1063/1.1686489 (2 pages) | Cited 1 time

Online Publication Date: 11 November 2003

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As supplied, the General Radio Co. type 1615‐A capacitance bridge can accommodate materials having loss tangents only as high as 1.0. A method of extending this capability, which does not involve additional external standards, and their attendant uncertainties, is described. The modified bridge may operate either as originally designed, with no deterioration in original performance, or in one of two new conductance ranges, greater than the original ones by a factor of 100. Slightly more involved calculations, allowing for the increased effect of stray capacitances, are required when the modification is in use. The new ranges must be compared with external precision standards initially in order to determine certain parameters used in these calculations. The results were most satisfactory.
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Erratum: Apparatus for ice point of capsule platinum resistance thermometer

Douglas L. Martin and Robert L. Snowdon

Rev. Sci. Instrum. 45, 1298 (1974); http://dx.doi.org/10.1063/1.1686490 (1 page)

Online Publication Date: 11 November 2003

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