Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1992-02-24
1993-05-11
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
356367, 356370, 356368, G01N 2121
Patent
active
052104176
ABSTRACT:
A modulated Faraday rotation signal is produced by passing a linearly polarized laser beam through a semiconductor wafer sample in a modulated magnetic field that is induced in an electromagnet by a sine wave generator and driver coupled thereto. The rotation signal is normalized by dividing by a transmission signal produced by modulating the beam with a chopper that operates at a different frequency from the frequency of the driver. The result is a Faraday rotation measurement with high signal-to-noise ratio and compensation for laser drift in intensity.
REFERENCES:
patent: 4637726 (1987-01-01), Walker et al.
patent: 4818881 (1989-04-01), Tanton et al.
V. A. Yatsenko and V. A. Bokov, "Magnetooptical Apparatus for Measuring the araday Effect and Susceptibility of Magnetic Films." Translated from Pribory i Tekhnika Eksperimeta, No. 4 (Jul.-Aug. 1979) pp. 227-230, Copyright.RTM. 1980 Plenum Publishing Corporation.
"A Nondestructive Testing Technique for Characterizing Infrared Detector/Focal Plane Array Material" by Frederick W. Clarke, Charles R. Christensen, John A. Grisham and John L. Stensby, Jan. 1991.
Christensen Charles R.
Clarke Frederick W.
Grisham John A.
Stensby John L.
Bush Freddie M.
Chang Hay Kyung
Hannaher Constantine
The United States of America as represented by the Secretary of
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