A frontier proposal with a validation plan, not an implemented detector.
Intended capability
Evaluate the sensing evidence for “RF Dipstick — Tanker Fill Level & Slosh State” in a stationary, controlled, ground-truthed vehicle study. This is not a vehicle, occupant, child, pet, or driver-safety system.
This describes the intended outcome. Readiness is research concept, evidence is class C, and a catalog mapping or recording is not proof of this outcome at a real site.
Solution blueprint
See the environment before installing it.
This exact kit is one of 191 first-class designs. It includes geometry, objects, nodes, wording, scenarios, installation, limitations, and catalog-bound readiness.
No rendered revision is available yet.
Bundled recording
A related Automotive scene
This is one recorded vertical scenario. It is not separate validation of every capability in the catalog.
01 The physics
Liquids with eps_r 20-80 versus air eps_r 1 make the fill surface a dominant dielectric boundary: fill height sets the reflection geometry and path delays of tank-interior multipath, while sloshing modulates those paths at the fluid's resonant frequency (0.5-2Hz), distinct from road vibration.
02 Shared processing path
RFF/NeRF eps_r field reconstruction for static fill height -> CIR delay tracking per fill state -> Doppler 0.5-2Hz slosh band energy -> compartment Kalman fusing fill estimate with flow/consumption model.
This is a capability design path. Components may be shared with other catalog entries; it is not presented as a unique algorithm.
03 Validation plan
Own-hardware: 200L drum and IBC tote, sweep fill 0-100% in 5% steps with ESP32 pair, verify monotonic delay/NeRF response; then live tanker trailer with certified dip readings as ground truth.
04 Commercial hypothesis
Retrofit tank telemetry with zero tank penetration and no intrinsic-safety certification burden — sold to bulk-liquid fleet managers and rail tank-car lessors.