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Digitale Medien

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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Details

ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: 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.

Materialart: Digitale Medien

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

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Digitale Medien

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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Details

ISSN: 1432-2110

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau

Notizen: 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.