Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1988-11-03
1990-01-02
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetometers
324260, G01R 3302
Patent
active
048915874
ABSTRACT:
A magnetic field sensor including a body of amorphous magnetic material [C] and means to propagate ultrasound [A.B.D.] in said body together with means [E,F; PD, PSD, F] to detect variation with ambient magnetic field strength in the effect of the body on the propagation of ultrasound therein. The ultrasound is propagated as zero-mode shear wave, said mode being controlled by having the thickness of the body of amorphous magnetic material below a critical value which is the quotient of velocity divided by frequency. A specific magnetic field [G,J; G,M] can be applied to control the operating point of the sensor. The field can be alternating and the effect on propagation detected by a phase detector followed by a phase sensitive detector.
REFERENCES:
patent: 4371838 (1983-02-01), Griscom
Robbins, W. P.; "Measurement . . . Using Magnetoelastic Rayliegh-Wave Convolution"; Journal of Applied Physics, vol. 47, No. 11, pp. 5116-5120, Nov. 1976.
Koo et al; Characteristics of Fiber-Optic Magnetic Field Sensors Employing Metallic Glasses, Optics Letters, vol. 7, No. 7, pp. 334-336, Jul. 1982.
National Research Development Corporation
Strecker Gerard R.
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