Ground penetrating detection using miniaturized radar system based on solid state microwave sensor

Abstract

We propose a solid-state-sensor-based miniaturized microwave radar technique, which allows a rapid microwave phase detection for continuous wave operation using a lock-in amplifier rather than using expensive and complicated instruments such as vector network analyzers. To demonstrate the capability of this sensor-based imaging technique, the miniaturized system has been used to detect embedded targets in sand by measuring the reflection for broadband microwaves. Using the reconstruction algorithm, the imaging of the embedded target with a diameter less than 5 cm buried in the sands with a depth of 5 cm or greater is clearly detected. Therefore, the sensor-based approach emerges as an innovative and cost-effective way for ground penetrating detection.

Electrical detection of magnetization dynamics via spin rectification effects

“…Following the proof of concept for such near-field spin rectification based microwave imaging systems [33,182,183] these techniques have been used for a variety of imaging purposes, including breast cancer [393] and ground penetrating radar detection [394]. In addition to the actual imaging of objects, rectification Figure 34: The rectification voltage measured by adjusting an rf phase shifter inserted into (a) one of the two microwave paths, and (b) only one microwave path which is connected to either the CPW or (c) the Py strip of a spin dynamo.…”

“…Following the proof of concept for such near-field spin rectification based microwave imaging systems [33,182,183] these techniques have been used for a variety of imaging purposes, including breast cancer [393] and ground penetrating radar detection [394]. In addition to the actual imaging of objects, rectification based sensors have been used in a variety of other contexts.…”