Stone Aerospace has developed several generations of non-task-loading head-up displays (HUD) for PLSS systems. While more sophisticated projection-based and optical shutter-based HUDs are available, these are more likely to be a distraction in a high risk environment. Through tens of thousands of hours of field experience we have found that there are only a few situations that can arise in a PLSS system that demand the attention of the “manned component” of the system. For most underwater applications the primary threats arise from oxygen partial pressure (hypoxia and hyperoxia) and the decompression status (“busting a ceiling” etc).

There are certain generic classes of system-wide concerns (e.g. consumables management for power, oxygen, diluent, CO2 removal and so on) that merit a third composite notification to the operator. We have found that a vast amount of critical information can be compressed into three low-power tri-state LEDs (as shown below right for the MK5 HUD). Similar human interfaces can be implemented for spacesuits in the form of visor projectors that add a fourth status light for CO2 levels. We will develop on-spec HUD systems for customers for a wide variety of operator interfaces and will develop all supporting electronics and firmware in a turnkey system or as an add-on to an existing design.

Contact us for further information.