In some examples, a system includes a head-mounted device, a visor that includes a reflective object that is substantially transparent in a visible light spectrum and embodied at a physical surface of the visor, at least one visor attachment assembly that couples the visor to the head-mounted device; at least one optical sensor; and at least one computing device communicatively coupled to the at least one optical sensor, the at least one computing device comprising a memory and one or more computer processors that: receive, from the optical sensor, an indication of light outside of a visible light spectrum that is reflected from the reflective object; determine, based at least in part on the light outside of a visible light spectrum that is reflected from the reflective object, a position of the visor; and perform, based at least in part on the position of the visor, at least one operation.

A training filter includes an upper shell having a substantially central hole; a lower shell adjoined to the upper shell; and a plug positioned in the substantially central hole and extending through the lower shell, wherein the plug includes a top wall having a plurality of apertures; a valve adjacent to the top wall and the plurality of apertures; the plug defining a hollow breathing resistance core adjacent to the valve; an angled sidewall flanking the breathing resistance core; and a connection mechanism connected to the plug opposite the top wall. The training filter duplicates the weight, size, shape, and breathing resistance of an actual filter and is reusable and cleanable without a shelf life unlike an actual filter.

An oxygen supply system includes a container housing having a container door, a latch controller coupled to a latch of the container door and configured to control the latch to releasably open the container door, a microcontroller coupled to the latch controller and configured to output a first latch deployment signal to the latch controller to cause the latch controller to open the latch, a pressure sensor coupled to the latch controller and configured to output a second latch deployment signal to the latch controller to cause the latch controller to open the latch, and an energy storage coupled to the microcontroller and the pressure sensor and configured to supply the microcontroller and the pressure sensor with electrical energy. The microcontroller includes built-in test equipment (BITE) configured to monitor and test the operability of one or more of the microcontroller, the latch controller, the pressure sensor and the energy storage.

An oxygen supply system includes a container housing having a container door, a latch controller coupled to a latch of the container door and configured to control the latch to releasably open the container door, a microcontroller coupled to the latch controller and configured to output a first latch deployment signal to the latch controller to cause the latch controller to open the latch, a pressure sensor coupled to the latch controller and configured to output a second latch deployment signal to the latch controller to cause the latch controller to open the latch, and an energy storage coupled to the microcontroller and the pressure sensor and configured to supply the microcontroller and the pressure sensor with electrical energy. The microcontroller includes built-in test equipment (BITE) configured to monitor and test the operability of one or more of the microcontroller, the latch controller, the pressure sensor and the energy storage.

A device that can be used to insert a probe into a filtering facepiece for fit testing. The device preferably includes a holder for the probe; a handle to apply force directly or indirectly to the probe; magnets that assist with alignment of the holder and the handle during a process of inserting the probe into the filtering facepiece; and a spring that facilitates separation of the holder and the handle after insertion of the probe into the filtering facepiece. The holder may further include a puncturing device to facilitate insertion of the probe. The holder and the handle preferably are separate elements positioned opposite each other to apply force to the probe. In some aspects, the holder includes a piston for driving the probe into the filtering facepiece. The spring may surround the piston. The handle preferably includes a recess capable of holding a fastener for the probe. The magnet(s) may be of any shape and type, but preferably are torus shaped neodymium magnets. Also, associated techniques.

A device that can be used to insert a probe into a filtering facepiece for fit testing. The device preferably includes a holder for the probe; a handle to apply force directly or indirectly to the probe; magnets that assist with alignment of the holder and the handle during a process of inserting the probe into the filtering facepiece; and a spring that facilitates separation of the holder and the handle after insertion of the probe into the filtering facepiece. The holder may further include a puncturing device to facilitate insertion of the probe. The holder and the handle preferably are separate elements positioned opposite each other to apply force to the probe. In some aspects, the holder includes a piston for driving the probe into the filtering facepiece. The spring may surround the piston. The handle preferably includes a recess capable of holding a fastener for the probe. The magnet(s) may be of any shape and type, but preferably are torus shaped neodymium magnets. Also, associated techniques.

A breathing equipment training device and a method for breathing training using a breathing equipment training device. The breathing equipment training device includes a shell and a diaphragm. The shell includes a first opening and a second opening, the first opening configured to be inserted into a breathing opening in a mask to form a connection with the breathing opening of the mask, and the second opening configured to be exposed to ambient air. The diaphragm is positioned in an inner cavity of the shell about the second opening, and configured to impede airflow into the shell through the second opening.

Apparatus and associated methods relate to fitting a virtual mask to a virtual face by first fitting a chin region of the virtual mask to the virtual face, then determining an virtual mask angle that maintains the fitted chin region while simultaneously fitting a nose-bridge region of the virtual mask to the virtual face, and then calculating a fit-quality metric corresponding to the fitted position. In an illustrative embodiment, the fitted chin region may include the high curvature menton region of the chin. In some examples, a virtual mask may be virtually pressed toward the virtual face using a predetermined force corresponding to a force of a mask securing device of a real mask corresponding to the virtual mask In an exemplary embodiment, the fitting of a virtual mask to a virtual face may advantageously yield a mask's fit quality in a brief amount of time.

In some examples, a system includes an article of personal protective equipment (PPE) having at least one sensor configured to generate a stream of usage data; and an analytical stream processing component comprising: a communication component that receives the stream of usage data; a memory configured to store at least a portion of the stream of usage data and at least one model for detecting a safety event signature, wherein the at least one model is trained based as least in part on a set of usage data generated by one or more other articles of PPE of a same type as the article of PPE; and one or more computer processors configured to: detect the safety event signature in the stream of usage data based on processing the stream of usage data with the model, and generate an output in response to detecting the safety event signature.

In some examples, a system includes an article of personal protective equipment (PPE) having at least one sensor configured to generate a stream of usage data; and an analytical stream processing component comprising: a communication component that receives the stream of usage data; a memory configured to store at least a portion of the stream of usage data and at least one model for detecting a safety event signature, wherein the at least one model is trained based as least in part on a set of usage data generated by one or more other articles of PPE of a same type as the article of PPE; and one or more computer processors configured to: detect the safety event signature in the stream of usage data based on processing the stream of usage data with the model, and generate an output in response to detecting the safety event signature.