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Voltage-controlled acousto-optic phase shifter (1988)

Ehrlich, Michael J. ; Phillips, Louis C. ; Wagner, James W.

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 59 (1988), S. 2390-2392

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ISSN: 1089-7623

Source: AIP Digital Archive

Topics: Physics , Electrical Engineering, Measurement and Control Technology

Notes: A novel solid-state technique for effecting a phase shift in a light beam has been developed utilizing a voltage-controlled rf phase shifter and two acousto-optic modulators. The acousto-optic phase-shifting technique provides a simple and accurate method of phase stepping, and is a solid-state alternative to conventional mechanical piezoelectric pusher techniques. Accuracy and repeatability of the prototype system were better than 1°. The technique lends itself quite well to situations where both heterodyne and quasi-heterodyne techniques are used for interferometric analysis.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1139915

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Development in the theory and analysis of eddy current sensing of velocity in liquid metals (1992)

Kahn, Arnold H. ; Phillips, Louis C.

Springer

Research in nondestructive evaluation 4 (1992), S. 237-248

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ISSN: 1432-2110

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract We have performed a theoretical study of the magnetic fields produced by a single turn ac coil encircling a moving conductive rod or tube of flowing liquid metal. A solution exact to first order in the velocity has been obtained as a closed-form integral. Radial variation of the velocity profile is included. The solution allows a calculation of the voltages induced in two secondary coils wired in opposition for application as a velocimeter. With secondary coils wired in series, the calculation provides the classical impedance vs. frequency curves which allow determination of sample conductivity and diameter. The solution has been used to optimize design for a sensor to be used for monitoring speed and tube bore diameter in a liquid metal atomizer system. An additional solution has been obtained for arbitrary magnitude of velocity, but for constant velocity profile.