Structure read from the outside.
The same capacitive physics that images multiphase flow inside vessels — adapted for solid media. Voids, cracks, delaminations, and composition gradients resolved within structures that cannot be opened, irradiated, or taken out of service.
The physics that images flow inside vessels also reads the interior of solid structures.
The transition from process imaging to material inspection is not a change in physics but in the state of the medium. Where process imaging targets dynamic multiphase flow, material inspection targets solid structures whose internal properties — voids, discontinuities, composition gradients, delaminations — are fixed in space but invisible from the exterior.
The measurement challenge in solid media is signal magnitude. Capacitance readings at dense solid boundaries are orders of magnitude smaller than in fluid systems. Genuine structural signals are buried in parasitic noise unless measurement architecture is redesigned at the circuit level. T-configuration CMOS switching was developed to address this directly, engineered specifically to strip stray capacitance out of the hardware: parasitic stray capacitance is eliminated in hardware — not corrected in software — exposing the genuine dielectric contrast within the material at sub-femtofarad precision.
A systematic comparison of ECVT sensor geometries identified planar and conforming configurations as optimal for flat structures and curved surfaces respectively. The 3D sensitivity matrix modification — originally developed to improve axial resolution in process imaging — also addresses the depth-resolution challenge in solid media inspection, where signal perturbation from an internal anomaly decreases with distance from the sensor surface. Applied to soil water infiltration by Baidillah, Mukhlisin, and Taruno (Hydrology and Earth System Sciences, 2012), this same framework demonstrated its reach into permittivity distributions within media far denser than industrial fluid systems.
Structural mapping from a single external face.
The signal inside dense solid media that conventional NDT cannot extract.
In dense solid materials, a void the size of a human hair creates a permittivity perturbation that, without hardware-level cancellation of parasitic sources, is indistinguishable from switching noise. T-configuration CMOS switching addresses this as a circuit architecture decision — not as a software filter applied after measurement. The result is sub-femtofarad precision in conditions where standard ECT systems would yield only noise.
The same framework that Baidillah, Mukhlisin, and Taruno applied to soil water infiltration — a medium with far greater density and lower dielectric contrast than industrial fluids — validates the measurement sensitivity in challenging solid permittivity environments. Sensor geometry selection from the 2013 comparison work ensures that the sensitivity distribution reaches the required inspection depth without resolution loss at the critical internal boundary.
- Sub-femtofarad precision — circuit-level parasitic cancellation, not software correction
- Planar sensors for flat structures (welds, laminates); conforming for curved (pipes, vessels)
- 3D sensitivity matrix resolves depth from single external surface
- No radiation, no extraction, no coating removal, no process shutdown
- Framework validated in dense media beyond industrial fluids (soil, 2012)
Where conventional NDT cannot reach.
Particularly suited to infrastructure where access is constrained and radiation is impractical.
Weld Integrity
Internal void and crack detection in welds — without cutting sections, without radiographic exposure, without removing the structure from service.
Composite Laminates
Internal delamination, void pockets, and fibre discontinuities in composite structures — resolved from the external surface using conforming sensor geometry.
Post-Tensioned Tendons
In-service assessment of post-tensioned tendons in concrete — no coring, no drilling, no shutdown. Sub-surface inspection from a single external face.
Pipeline Wall
Wall thickness variation, internal corrosion, and lining integrity in pressurised or externally coated pipelines — inspection without coating removal or process interruption.
Concrete & Masonry
Void detection and reinforcement mapping within concrete and masonry — planar sensor on external face, 3D permittivity reconstruction of the interior.
Subsea & Coated Structures
Inspection through protective coatings and linings — no surface preparation beyond basic cleaning. No radiation hazard in confined or subsea environments.
ECVT Colins
Field-deployable ECVT configured for continuous coal quality assessment — moisture, ash fraction, and density gradients resolved as coal moves through bunkers, chutes, and stockpiles. External sensor array, portable data acquisition, real-time permittivity mapping without sampling or process interruption. Built on the same sub-femtofarad measurement architecture developed for dense solid media.