Materials, Photonic Devices, and Sensors

Radio frequency switching network: a technique for infrared sensing

[+] Author Affiliations
Deborah M. Mechtel, R. Brian Jenkins, Charles L. Nelson

US Naval Academy, Department of Electrical and Computer Engineering, 105 Maryland Avenue, Annapolis, Maryland 21402, United States

Peter J. Joyce

US Naval Academy, Department of Mechanical Engineering, 590 Holloway Road, Annapolis, Maryland 21402, United States

Opt. Eng. 55(10), 107106 (Oct 21, 2016). doi:10.1117/1.OE.55.10.107106
History: Received July 14, 2016; Accepted September 28, 2016
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Abstract.  This paper describes a unique technique that implements photoconductive sensors in a radio frequency (RF) switching network designed to locate in real-time the position and intensity of IR radiation incident on a composite structure. In the implementation described here, photoconductive sensors act as rapid response switches in a two-layer RF network embedded in an FR-4 laminate. To detect radiation, phosphorous-doped silicon photoconductive sensors are inserted in GHz range RF transmission lines. By permitting signal propagation only when a sensor is illuminated, the RF signals are selectively routed from lower layer transmission lines to upper layer lines, thereby pinpointing the location and strength of incident radiation. Simulations based on a high frequency three-dimensional planar electromagnetics model are presented and compared to the experimental results. The experimental results are described for GHz range RF signal control for 300- and 180-mW incident energy from 975- to 1060-nm wavelength lasers, respectively, where upon illumination, RF transmission line signal output power doubled when compared to nonilluminated results. The experimental results are also reported for 100-W incident energy from a 1060-nm laser. Test results illustrate real-time signal processing would permit a structure to be controlled in response to incident radiation.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Deborah M. Mechtel ; R. Brian Jenkins ; Peter J. Joyce and Charles L. Nelson
"Radio frequency switching network: a technique for infrared sensing", Opt. Eng. 55(10), 107106 (Oct 21, 2016). ; http://dx.doi.org/10.1117/1.OE.55.10.107106


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