Abstract: Environmental sensing devices, systems and methods are provided. In one embodiment, an environmental sensing device includes an environmental sensor and an internal signal generator. The environmental sensing device may be configured to be mechanically coupled to one or more interior surfaces of an enclosure. The environmental sensor may be operable to detect one or more substances within the enclosure and provide a status signal to the internal signal generator corresponding to the presence of the one or more substances. The internal signal generator may be operable to generate a mechanical report sequence corresponding to the status signal. The mechanical report sequence may be a series of mechanical pulses applied to an interior surface of the enclosure.

Abstract: Chemical sensors whose active element exhibits both a visual change in color and a measurable change in electrical resistance when exposed to an analyte to which it selectively reacts are provided. These sensor have several unique features including vastly improved stability measured in years, irreversible visual changes and surprisingly reversible electrical changes. The combined unique features enable a new generation of ultra low power alerting, alarming and readout devices for hydrazines and other strongly reducing chemicals.

Abstract: Environmental sensing devices, systems and methods are provided. In one embodiment, an environmental sensing device includes an environmental sensor and an internal signal generator. The environmental sensing device may be configured to be mechanically coupled to one or more interior surfaces of an enclosure. The environmental sensor may be operable to detect one or more substances within the enclosure and provide a status signal to the internal signal generator corresponding to the presence of the one or more substances. The internal signal generator may be operable to generate a mechanical report sequence corresponding to the status signal. The mechanical report sequence may be a series of mechanical pulses applied to an interior surface of the enclosure.

Abstract: Chemical sensors whose active element exhibits both a visual change in color and a measurable change in electrical resistance when exposed to an analyte to which it selectively reacts are provided. These sensor have several unique features including vastly improved stability measured in years, irreversible visual changes and surprisingly reversible electrical changes. The combined unique features enable a new generation of ultra low power alerting, alarming and readout devices for hydrazines and other strongly reducing chemicals.