AetherShield A Wearable Filtered-Air Neck Unit with Integrated Head-Up Display Face Shield by Kaveh Dimitri Salahi
Description
AetherShield A Wearable Filtered-Air Neck Unit with Integrated Head-Up Display Face Shield Kaveh Dimitri Salahi Technical Whitepaper v1.1 — July 2026 — Licensed CC BY 4.0 Contents The Problem System Architecture Airflow and Filtration Thermal Conditioning The Head-Up Display Compute, Interaction, and Privacy Power Budget and Mass Standards and Certification Pathway Comparative Analysis Limitations and Open Problems Development Path Design Philosophy Attribution, License, and Contribution Abstract AetherShield is a body-worn respiratory and informational system built around two coupled subsystems: a U-shaped neck unit that draws, filters, and thermally conditions ambient air, and a full-face shield that receives that air while serving as the combiner surface for a head-up display. The system operates in two distinct states. In ambient mode the shield sits open at the perimeter and the unit runs as a comfort and awareness device with partial particulate protection. In hazard mode a deployable perimeter seal engages, airflow rises above the threshold for loose-fitting powered air-purifying respirators, and the interior is held at positive pressure so that leakage runs outward rather than inward. Filtration uses a fixed HEPA-class particulate stage in series with a swappable gas cartridge conforming to established color-coded classes, allowing one device to cover wildfire smoke, industrial solvent exposure, agricultural ammonia, and ordinary urban particulate without redesign. Imagery reaches the wearer through a projection architecture derived from automotive head-up displays: a picture generation unit in the neck unit throws light through a fold mirror onto a partially reflective coating on the shield’s inner surface, forming a virtual image approximately two meters away, well outside the eye’s near point. Thermal conditioning is asymmetric by design — resistive heating in winter is thermodynamically cheap and included, while summer conditioning relies on high-volume convective and evaporative cooling rather than refrigeration, a decision that preserves the power budget and avoids claims the physics will not support. This document sets out the architecture, the airflow and power budgets, the standards pathway, an honest comparison against existing respiratory equipment, and the unresolved engineering problems that stand between the concept and a product. The Problem Respiratory protection has a compliance problem far more than it has a technology problem. Filtering facepiece respirators that work well in laboratory fit testing perform substantially worse in the field, and the gap comes almost entirely from human behavior rather than material failure. People remove them to speak. They remove them to eat and drink. They loosen them when heat and humidity build inside the facepiece, which happens within minutes at moderate exertion. Facial hair breaks the seal on tight-fitting devices, disqualifying a large fraction of adult men ....