Abstract: A self-cleaning sensor guard is provided. The guard may comprise an acoustic duster housing, a dust guard, a proximity sensor, a phase-enabled controller, and an ultrasonic cleaning source. The dust guard may be positioned to impede passage of ambient particulates into the acoustic duster housing. The proximity sensor may be positioned to generate a dust detection signal that is indicative of the presence of particulates on the dust guard. The ultrasonic cleaning source may be oriented to direct multi-phase and multi-frequency ultrasonic cleaning waves towards the dust guard. The phase-enabled controller may be programmed to drive the ultrasonic cleaning source, at least partially in response to the dust detection signal, by superimposing a first acoustic signal and a second acoustic signal.

Abstract: A universal safety guard is provided. The guard may comprise a housing comprising an adapter coupling end, a dual mode chamber, a calibration gas port, and an ambient air end. The guard may also comprise an assembly configurable in a sensing position, in which ambient air may be admitted into the chamber, and a calibration position, in which calibration gas may be admitted into the chamber and the ambient air is blocked from reaching the chamber. The guard may comprise a detector adapter comprising a calibration housing fitting at one end and a gas detector fitting at an opposite end. The calibration housing fitting may comprise a static circumferential sealing interface that hermetically engages the adapter coupling end. The gas detector fitting may comprise a dynamic inner circumferential sealing interface for hermetic engagement with a gas detector comprising an outer sealing interface that complements the dynamic inner circumferential sealing interface.

Abstract: A universal safety guard is provided. The guard may comprise a housing comprising an adapter coupling end, a dual mode chamber, a calibration gas port, and an ambient air end. The guard may also comprise an assembly configurable in a sensing position, in which ambient air may be admitted into the chamber, and a calibration position, in which calibration gas may be admitted into the chamber and the ambient air is blocked from reaching the chamber. The guard may comprise a detector adapter comprising a calibration housing fitting at one end and a gas detector fitting at an opposite end. The calibration housing fitting may comprise a static circumferential sealing interface that hermetically engages the adapter coupling end. The gas detector fitting may comprise a dynamic inner circumferential sealing interface for hermetic engagement with a gas detector comprising an outer sealing interface that complements the dynamic inner circumferential sealing interface.