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Microwave Non-Destructive Examination (NDE)

Compass Technology Group’s various probes and antennas can be integrated with miniaturized microwave analyzers to characterize a range of materials, composites, and components. We offer measurement systems based on the idea of sensor and analyzer integration, including handheld and robotically mounted Microwave NDE systems. Microwave NDE is growing in importance because measurements that were traditionally restricted to the research laboratory can now be brought to the factory floor. This enables more efficient and cost-effective material and component manufacturing, repair, and quality assurance.

Three different compact AMMP Spot Probes, including SP324, SP240, and SP218, all designed to operate at different frequencies

AMMP Spot Probe Family

Advanced Microwave Mapping Probes (AMMP) are compact, ruggedized antennas for characterizing materials and components at microwave or millimeter wave frequencies. Unlike traditional antennas, AMMP spot probes are optimized for illumination of a surface that is near the end of the probe. AMMP integrates a shaped dielectric body with internal radiator components to approximate the performance of a traditional laboratory lens system, but in a very compact package. It was developed by applying Computational Electromagnetic (CEM) design optimization to both the dielectric and internal conductive components together. This is in contrast with traditional dielectric rod probes, which insert shaped dielectric rods into traditional waveguide or horn antennas.

Person using a handheld AMMP system, which integrates the SP218 and a pocket-sized vector network analyzer (VNA)

Handheld AMMP System

The handheld AMMP integrates the SP218 probe and a pocket-sized vector network analyzer (VNA) into a rugged, handheld reflectometer device. This system enables 2-18 GHz measurements of component surfaces and is tethered to a laptop or tablet only by a USB cable instead of RF cables, which are the biggest source of measurement error and failure in many systems. It can be used on curved surfaces as well as flat.
Man setting up a microwave caliper system to measure microwave transmissions

Microwave Calipers

Microwave calipers are fixtures that mount two AMMP sensors on a “C”-shaped yoke so that it can be positioned to measure microwave transmission through a sheet or slab specimen. It is combined with a two-port vector network analyzer (VNA), which can be either integrated into the handle or placed nearby and connected with RF cables.
Adaptive Radome Diagnostic System equipment set-up in laboratory

Adaptive Radome Diagnostic System

The Adaptive Radome Diagnostic System (ARDS) is a robotic device for scanning aircraft radomes with CTG’s AMMP sensor. It utilizes a collaborative robot to move the spot probe over the radome surface, which maps the microwave reflectivity. The measured data then can determine radome layer thicknesses and identify defects within the radome structure. The collected data can also determine the overall radome performance metrics through specialized ray-trace software called ROPE (Radome Operational Performance Evaluation).
FLAT 500 is a small and light wide antenna operating through microwave frequency bands of 500 MH-6 GHz

FLAT Family: Smaller and Lighter Horn Antennas

Flat Lens Antenna Technology (FLAT) is a wide bandwidth, low frequency antenna that has directivities like conventional dual-ridged horn antennas but in a much smaller and lighter form, while maintaining equivalent VSWR (voltage standing wave ratio). FLAT antennas include advanced metamaterials for enhancing gain and reducing back and side-lobes and are designed to operate at VHF through microwave frequency bands.
Person using a resonant eddy current sensor, characterizes conductive composites

Resonant Eddy Current Sensor

The Resonant Eddy Current Sensor (RECS) is a specialized device for characterizing conductive composites such as carbon fiber laminate or silver filled paint coatings. It operates in the 1 MHz to 1 GHz range and uses resonance to enhance sensitivity to conductive composite materials.