Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 9
Book Description
Low Frequency Phase Shift Measurement Techniques
Author: A Low Frequency Phase Shift Method
Author: Ronnie Carroll McMillanPublisher:
ISBN:
Category : Phase shift (Nuclear physics)
Languages : en
Pages : 58
Book Description
"The phase shift method of measuring atomic lifetimes is particularly useful because it allows us to make measurements in the steady state mode instead of in the transient mode. High frequency phase shift techniques cause many problems. The equipment, which was designed and built to make low frequency phase shift techniques possible, is shown schematically and discussed. The new experimental techniques employed in our apparatus are a phase multiplier and a unique method of using a photomultiplier as a mixer. In the photomultiplier the final dynode is used as the grid of a triode. The next to the last dynode may be thought of as the cathode of a triode normally used as a mixer. Using the photomultiplier in this fashion, we have a low noise, extremely efficient mixer. The phase multiplier is essential to accurately measure small phase angles. The problems of high frequency techniques are cited and references given. The speed of light was measured as a test of the equipment. The experimental values resulted in a .95 confidence interval containing the generally accepted value of the speed of light in air. The average value measured was (2.937 ± .033) x 108 meters per second, where .033 is the standard deviation for 48 trials. This average value represents an error of 1.61%. From the results we have established the feasibility of this low frequency method of measuring atomic lifetimes"--Abstract, leaves [i-ii].
Scientific and Technical Aerospace Reports
Author: Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1460
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Electronic Measurement Techniques
Author: D. F. A. EdwardsPublisher: Butterworth-Heinemann
ISBN: 1483279871
Category : Technology & Engineering
Languages : en
Pages : 390
Book Description
Electronic Measurement Techniques provides practical information concerning the techniques in electronic measurements and a working knowledge on how to adopt and use the appropriate measuring instruments. SI units are used as the unit of measurement in the book. The text contains chapters focusing on a variety of measurement techniques. The initial chapter discusses the system of measurements and principles used in electronic measurements. Subsequent chapters cover instruments for direct current measurement, electronic voltmeters, methods for the measurement of alternating currents and potential differences, and measurement of power. Chapters are also devoted to the elaboration of the construction of standards for comparison purposes and the measurement of non-electrical quantities. Engineers will find the book very useful.
Measurement Techniques in Space Plasmas
Author: Robert F. PfaffPublisher: American Geophysical Union
ISBN: 0875900852
Category : Science
Languages : en
Pages : 350
Book Description
Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 102. Space plasma measurements are conducted in a hostile, remote environment. The art and science of measurements gathered in space depend therefore on unique instrument designs and fabrication methods to an extent perhaps unprecedented in experimental physics. In-situ measurement of space plasmas constitutes an expensive, unforgiving, and highly visible form of scientific endeavor.
NBS Technical Note
Author: Publisher:
ISBN:
Category : Physical instruments
Languages : en
Pages : 352
Book Description
Fiber Optic Test & Measurement
Author: Inc. IgicPublisher: Information Gatekeepers Inc
ISBN: 9781568510538
Category : Technology & Engineering
Languages : en
Pages : 874
Book Description
Measurement of Pavement Thickness by Rapid and Nondestructive Methods
Author: S. D. HowkinsPublisher:
ISBN:
Category : Pavements
Languages : en
Pages : 106
Book Description
The feasibility is investigated of various acoustic (sonic), nuclear, and electrical techniques for nondestructive measurement of Portland cement and bituminous concrete pavement thickness both during and after construction. Recommendations are made for equipment development and field testing of three specific methods that could potentially result in such measurements with the desired degree of speed and accuracy.
Digital Measurement Techniques
Author: T. S. RathorePublisher: Alpha Science Int'l Ltd.
ISBN: 9781842650431
Category : Computers
Languages : en
Pages : 340
Book Description
This work is intended for use in introductory courses or secondary courses in instumentation at the final year of undergraduate, or in the first year of postgraduate courses in electrical, electronics, instrumentation and computer engineering. It should also be of use to postgraduate students of physics interested in the area of electronic instrumentation and to researchers and praticing engineers.
Electromagnetic Metrology
Author: Publisher:
ISBN:
Category : Electric measurements
Languages : en
Pages : 800
Book Description