A Fiber Optic Microwave Power Probe: A Preliminary Report

Victor M. Martin; Ronald M . Sega; Stewart M . Angell

doi:10.1117/12.935802

19 September 1983 A Fiber Optic Microwave Power Probe: A Preliminary Report

Victor M. Martin, Ronald M . Sega, Stewart M . Angell

Proceedings Volume 0412, Fiber Optic and Laser Sensors I; (1983) https://doi.org/10.1117/12.935802
Event: 1983 Technical Symposium East, 1983, Arlington, United States

Abstract

Measurements are always subject to errors resulting from the interaction of the measurement device with the quantity being measured. When dealing with electromagnetics, the fields are typically detected with some type of antenna which must be electrically connected to a recording instrument. The antenna as well as its electrical connection can, at times, significantly perturb the field being measured. By using fiber optics to the maximum extent possible in the detection process, microwave fields are perturbed only minimally since most of the probe and associated connections are dielectric. This paper presents the preliminary results obtained by using a commercially available fiber optic thermometer in the measurement of microwave power. In the measurement scheme a small amount of slightly conductive material is placed in contact with the fiber optic sensor. In the presence of a microwave field, currents are induced in the conductive material which in turn produces joule heating. It is shown experimentally that under certain circumstances the probe temperature is linearly related to the power level present. Experimental results will be presented for power measurements at 2.45 GHz and 94 GHz. Probe design criteria as well as limitations are also discussed.

Citation Download Citation

Victor M. Martin, Ronald M . Sega, and Stewart M . Angell "A Fiber Optic Microwave Power Probe: A Preliminary Report", Proc. SPIE 0412, Fiber Optic and Laser Sensors I, (19 September 1983); https://doi.org/10.1117/12.935802

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