Abstract: In an example implementation according to aspects of the present disclosure, a method may include receiving a temperature reading from a sensor coupled to the head mounted unit. A delta may be calculated based on the temperature reading and a predetermined temperature. A thermo-electric cooling device may be activated based on the delta surpassing a threshold. The thermo-electric cooling device utilizes thermally conductive plates, padding and fabric to transfer thermal energy.

Abstract: The invention relates to a visualization device (1), in particular a virtual reality (VR) headset or head mounted display (HMD) for transferring images of a microscopy device (100), comprising: a supporting device (2) for arranging the visualization device (1) on the head of a user, at least one mounting device (3) for mounting at least one optical display device (4) about a point of rotation on the supporting device (2), wherein there is at least one drive device (5) via which the at least one optical display device (4) on the at least one mounting device (3) is movable between an operating position (B) and a rest position (R), such that the at least one optical display device (4) can be fixed, in the operating position (B), in the field of view of the user and, in the rest position (R), outside of the field of view of the user, wherein the drive device (5) is attached in a region outside of the point of rotation of the mounting device (3) on the at least one display device (4).

Abstract: Systems and methods for coupling a clip to a wearable item with a receiver. The methods involve: receiving the clip's latch structure in the receiver's channel; sliding the latch structure's side members against a channel surface; sliding the latch structure's latch body against the channel's opening edge; bending the latch body by biasing the latch body towards the latch structure's common body portion as the latch body slides against the edge; inserting the latch body and the side members through the channel until at least the free end of the latch body no longer resides in the channel, the latch body automatically unbending when the free end of the latch body no longer resides in the channel; and preventing at least the free end of the latch body from re-entering the channel such that the clip is coupled to the wearable item.

Abstract: A hard hat attachment system is described with front, back, and side mounts to support various accessories. Mounts of hard hat receive slots of a bracket that fit around the ridges. Auxiliary ridges receive clips within ports. The user customizes the hard hat for the particular task with the preferred accessories used to complete the job. For example, lamps, face-shields, reflectors, tool carriers, and eyeglass holders are interchangeably releasably coupled to mounting and/or auxiliary ridges on the hard hat. In this way, the hard hat is customized and/or modified to support a wide variety of accessories that are securely and releasably attached to mounting and/or auxiliary ridges without destructive alterations to the hard hat. Brackets couple to mounts and clips couple to ports to secure and/or lock various accessories in place during operation and prevent accidental knocks or jarring the accessory loose.

Abstract: A modular shroud system includes a shroud configured to be coupled to a helmet. The modular shroud system further includes a plate configured to be detachably coupled to the shroud. The plate may be configured to be detached from the shroud while the shroud is coupled to the helmet.

Abstract: An interface system for a helmet mounting system comprises a helmet strap assembly. A helmet shroud includes a shroud interface assembly configured to mate with a first hot shoe of a helmet mount assembly. The shroud interface assembly comprises a high speed data interface configured to be electrically coupled to the first hot shoe when the shroud interface assembly is coupled with the first hot shoe. A battery mount assembly comprises a second hot shoe portion which is configured to mate with a hot shoe receiver of a battery pack. The second hot shoe portion comprises a high speed data interface which is configured to be electrically coupled to high speed contacts on the hot shoe receiver of the battery pack when the second hot shoe portion is coupled with the hot shoe receiver of a battery pack.

Abstract: Various embodiments of helmets and methods of their manufacture are disclosed. In some embodiments, the helmet includes a helmet shell having a helmet shell edge and/or a mounting location for mounting an accessory to the helmet shell. A material that is adherent to the helmet shell may be sprayed onto the helmet shell edge of the helmet shell to form a trim. Alternatively, the material may be sprayed onto a portion of the helmet shell associated with either a mounting location for mounting an accessory or a position for a mounted accessory.

Abstract: An oxidation furnace for the oxidative treatment of fibers having a housing which is gas-tight, apart from passage openings for the fibers, inter alia. A process chamber is located in the interior of the housing. Deflecting rollers guide the fibers through the process chamber in a serpentine manner so that the fibers lie next to one another as a fiber carpet which spans a plane between opposite deflecting rollers. An atmosphere-generating device can generate a hot working atmosphere and includes a blowing device with at least one outlet window through which a hot working atmosphere can be blown into the process chamber between two adjacent planes of the fiber carpet (22a). The working atmosphere is guided into the process chamber by a flow guiding system. The flow guiding system includes exchangeable flow guiding elements with flow passages which can be detachably and/or movably mounted on the blowing device, before the outlet window.

Abstract: A protective helmet including a visor attached to the external sides of the helmet shell. The shell includes substantially flat mount surfaces on each side which correspond with substantially flat portions on the respective ends of the visor. A fastener hole on the shell aligns with an access hole on the visor so that the two elements can be releasably fastened. The access hole provides space for a fastener to protrude out from the surface of the shell, allowing the visor to sit flush against the shell when fastened together. The helmet may include chin straps which are attached to the inner surface of the shell. The helmet may also include a catch strip on the front of the visor which protrudes from the visor such that it can prevent a cloth helmet cover (sometimes used in games such as Roller Derby) from easily sliding off the helmet.

Abstract: A head-mounted display system includes a positioning and stabilising structure structured and arranged to hold a display unit in an operational position over a user's face in use and an interfacing structure for the display unit constructed and arranged to be in opposing relation with the user's face. The interfacing structure comprises a substantially continuous face engaging surface adapted to contact the user's face around a periphery of the user's eyes. The interfacing structure comprises silicone. The interfacing structure is configured and arranged such that force applied to the user's face is distributed around the periphery thereof. The interfacing structure comprises a first compliance at a first region and a second compliance at a second region, wherein the first region and the second region are configured around the periphery of the interfacing structure to allow selective distribution of the force onto the user's face.

Abstract: A visor carrier assembly for a safety helmet includes a double-pivot mechanism attachable to each side of a safety helmet and configured to enable a visor to be selectively pivoted. An elongate arm of the double-pivot mechanism includes first and second pivotal couplings, each including a coupling member being a fixed elongate pin having rounded portions at each end, and a coupling region including an aperture defining, along its inner edge, a first notch or aperture within which one of the rounded portions of a respective coupling member is received to define a fixed pivot point, and an arcuate guide wall with which the opposite rounded portion of said respective coupling member engages and having ridges defining grooves or notches for receiving the opposite rounded portion as a respective pivotal coupling is pivoted about the fixed pivot point, each groove or notch defining a respective said visor position.

Abstract: A wearable animal feeder, and methods of making and using such a wearable animal feeder, whereby the wearable animal feeder includes a face shield having opposing face shield upper and lower portions, and opposing face shield front and rear faces; and a reservoir having a reservoir outlet coupled to the face shield lower portion, whereby the reservoir outlet outwardly extends from the face shield front face.

Abstract: A suspension band assembly to be used to support a hard hat on a head of a user. The suspension band assembly includes a primary support loop to receive the head of the user therein. An electronic peripheral is fixedly secured to the primary support loop. An attachment strap extends out from the primary support loop to a strap distal end. An anchor is fixedly secured to the strap distal end for securing the attachment strap to the hard hat. An electrical anchor contact is fixedly secured to the anchor to provide an electrical connection between the hard hat and the electronic peripheral located on the primary support loop.

Abstract: A system is provided to secure a pair of glasses to a hat, the system including a hatband insert configured to be inserted in a hatband of a hat, one or more hatband magnetic members configured to be selectively attachable to a plurality of locations of the hatband insert, and one or more glasses magnetic members configured to be attached to each temple of a pair of glasses, wherein the one or more hatband magnetic members and the one or more glasses magnetic members are configured to be magnetically attached to selectively secure the glasses to the hat.

Abstract: The present application relates to a welding helmet comprising a helmet housing and a head cover adapted to be worn on a wearer's head and made of an air-impermeable and flexible material, wherein a zipper arrangement is provided between the helmet housing and the head cover to detachably connect the head cover to the helmet housing around the whole perimeter of an opening of the helmet housing, and wherein after the head cover is connected to the helmet housing, the zipper arrangement is located within the housing of the welding helmet. The present application also relates to an assembly having the welding helmet.

Abstract: The present disclosure includes a retrofit sensor module for use with a protective head top with a helmet and a visor. The sensor module includes a sensor housing and an attachment mechanism. The sensor housing encloses a head presence sensor to sense when the protective head top is being worn. The sensor housing also encloses a position sensor to sense the position of the visor relative to the helmet. The retrofit sensor module further comprises an attachment mechanism secured to the housing. The attachment mechanism mates with a first hinge component of a hinge assembly in the protective head top to removably install the sensor module into the protective head top, wherein the hinge assembly allows the visor to move relative to the helmet.

Abstract: A helmet assembly having a helmet, a mandible guard, and an accessory attachment system that is used to selectively attach and secure the mandible guard to the helmet is disclosed. In some embodiments, the mandible guard is arranged to be detached from a first side of the helmet while remaining secured to a second side of the helmet. In such embodiments, the mandible guard may be moved outwardly and away from a wearer as the mandible guard pivots around the accessory attachment system attached to the second side of the helmet.

Abstract: A Soil Moisture and Electrical Conductivity Probe. The soil moisture probe employs brass ring pairs, wherein each pair incorporates dual feedpoints. There is a single main control circuit for operating the plurality of sensor ring pairs in a multiplexed approach. In order to allow for multiplexed operation, each sensor ring pair includes a signal tuning assembly. The signal tuning assembly includes apparatus for attenuating the signal noise at each sensor ring pair, as well as apparatus for matching the ring-pair to ring-pair lead impedence. The temperature of each ring pair is individually detected to improve the accuracy of all of the sensor ring pairs. This temperature sensing is accomplished by multiplexing a single reference voltage with all of the sensor rings, and by implementing a thermistor at each sensor ring pair.

Abstract: A hands-free headlamp system for an item of headwear, the hands-free headlamp system including: a housing including headwear fastener, the headwear fastener configured to attach to the item of headwear an energy storage affixed to the housing; a light source mechanically coupled to the housing and electrically coupled to the energy storage; a motion sensor mechanically coupled to the housing and electrically coupled to the energy storage, the motion sensor configured to detect hand motion of a user; a controller mechanically coupled to the housing, electrically coupled to the energy storage, and communicably coupled to the motion sensor, the controller configured to operate the light source in response to detected hand motions of the user.

Abstract: Disclosed is a portable earphone device. The device comprises: a neckline earphone, comprising a voice module and a first wireless communication module communicationally connected to the voice module; and a neckband, comprising a second wireless communication module, a network connection module, and a processor, both the second wireless communication module and the network connection module being communicationally connected to the processor; the first wireless communication module being communicationally connected to the second wireless communication module; the neckline earphone being detachably accommodated in the neckband to constitute a neckband earphone. The device can be individually used as a neckline earphone and can be used as a neckband earphone in an accommodation state.

Abstract: A headband adjusting device includes a mounting base including an internal ratchet, a linkage mounted on the mounting base. The linkage includes a transmission member and an elastic position limiting member configured to abut against a tooth of the internal ratchet. The headband adjusting device also includes a thumbwheel connected with the linkage and configured to cause the linkage to rotate, the thumbwheel including a disengaging member corresponding to the position limiting member. When the thumbwheel rotates in a first direction, the disengaging member abuts against the position limiting member to unlock the internal ratchet. When the thumbwheel rotates in a second direction, the position limiting member rotates while contacting the internal ratchet. The headband adjusting device further includes a transmission mechanism coupled with the transmission member. The linkage is configured to drive the transmission mechanism, which drives a headband to extend or retract.

Abstract: A method of synchronizing flashing of a plurality of marker systems includes within each marker system of the plurality of marker systems, receiving a signal from at least one global positioning satellite, the signal comprising a time value. Then, when initiating illumination of at least one light emitting device of the marker systems, synchronizing of the initiating illumination to the time value.

Abstract: A decoupling radiant and convective heat sensing device having sensor elements facing in different directions, and a decoupling radiant and convective heat sensing device having sensor elements facing in different directions with a means for determining the remaining time before a Self Contained Breathing Apparatus facemask will become compromised by dangerous heat conditions.

Abstract: A device is configured to adjust interpupillary distance in a HMD. The device include a fixed plate, a button assembly, a spring, and a gear. The spring biases the button assembly towards the fixed plate to prevent movement of the button assembly. A button of the button assembly can be pressed beyond a threshold distance to disengage the button assembly and the fixed plate. Consequently, the button assembly can be moved relative to the fixed plate. The gear meshes with a gear rack of the button assembly and is associated with two display assemblies of the HMD. The movement of the button assembly drives the gear to rotate. The rotation of the gear causes the two display assemblies of the HMD to move in opposite directions. The movement of one of the display assemblies relative to the other display assembly adjusts interpupillary distance in the HMD.

Abstract: A system is proposed for observing nocturnal activities and temperature variation of a living target during daytime. The system includes an observation box, an imaging device, and a near infrared (NIR) source unit. The observation box allows passage of near infrared, blocks passage of visible light, and contains and covers the living target. The imaging device includes a first image capturing module to capture a thermal image of the observation box using far infrared, and a second image capturing module to capture an image of the observation box using visible light and of the living target using near infrared. The NIR source unit projects near infrared toward the observation box for enhancing near infrared reflected by the living target.

Abstract: A method controls an alert indicator on a helmet. A physiological sensor and an accelerometer sensor in the helmet monitor a wearer of the helmet. A human observer subjectively detects that the wearer of the helmet is showing signs of an impaired cognitive state, and sends a signal/marker that marks a point in the sensor readings that the impaired cognitive state manifested itself. A subsequent series of sensor readings from the physiological and accelerometer sensors are taken at a later time. If this subsequent series of sensor readings matches the earlier sensor readings up to the point that the human observer subjectively detected the helmet wearer's impaired cognitive state, then an alert indicator is activated on the helmet, warning the wearer of the helmet of an impending recurrence of the impaired cognitive state for the wearer of the helmet.

Abstract: A helmet including a lighting system integrated into said helmet, the lighting system comprising a first layer; light emitting means mounted to said first layer; controller means mounted to said first layer for controlling said light emitting means; wiring means for linking said light emitting means to said controller means; a second layer fixably attached to said first layer thereby providing an area between said first and second layer for said light emitting means, controller means, and wiring means; power means fixably attached to said second layer for powering said controller and light emitting means; and operating means functionally linked to said controller means for operating said controller means. The application also discloses lighting system contained in a shell that that can be attached to an existing helmet. This application also discloses a lighting system contained in a flexible material that can be fitted onto an existing helmet.

Abstract: The invention relates to a microphone holder for attachment to the housing of a radio device, which is provided with a rod antenna joined thereto, wherein the microphone holder is embodied as a clip, which can be placed on the radio device housing and which surrounds the rod antenna, and includes a receiving pocket for the microphone, a sleeve for receiving the rod antenna, and a clamp for firmly clamping the microphone holder to the radio device housing.

Abstract: Systems and methods for attaching an accessory to a helmet. A helmet accessory mounting interface may be attached to a receptacle. The receptacle may be removably or permanently received by a carrier. The carrier may be attached to a helmet having a particular shape and size. The carrier also may be configured to receive any selected type of a plurality of receptacle types which, in turn, corresponds to a particular mounting interface for a helmet accessory. The receptacle may be receivable, in some embodiments removably, by any one of a number of different types of carriers.

Abstract: A head-mounted-display strap assembly may include a flexible lining member having (1) a head-contact layer positioned to abut a head portion of a user, (2) a mounting layer overlapping the head-contact layer, the mounting layer defining a wiring channel, and (3) a mesh layer disposed between the head-contact layer and the mounting layer such that a portion of the mesh layer overlaps the wiring channel. A method may include (1) attaching a head-contact layer for a head-mounted-display strap assembly to a mesh layer and (2) attaching a mounting layer to the mesh layer such that the mesh layer is disposed between the head-contact layer and the mounting layer the mounting layer defining a wiring channel, and a portion of the mesh layer overlapping the wiring channel. Various other head-mounted-display strap assemblies, head-mounted-display systems, and methods are also disclosed.

Abstract: Methods for quantifying pupil swim are disclosed in order to compensate for the same. A target image, in one embodiment, is displayed on a display of a head mounted display (HMD). Images of the target image are captured from a plurality of positions relative to an optical axis of an optics block of the HMD at an exit pupil of the HMD. The target image includes features and differences between observed locations of the features and their expected locations absent the optics block are determined. From these differences, a wavefront of the optics block is reconstructed and distortion corrections for the optics block are generated using the wavefront. The distortion corrections, when applied to a virtual scene, add pre-distortion that is canceled by the optical imperfections of the optics block as light of the virtual scene with the pre-distortion passes through the optics block.

Abstract: There is provided a voice processing system capable of acquiring user voice more clearly, the voice processing system including: a mounting unit configured to be attached to a user. The mounting unit includes at least three voice acquisition units configured to acquire voice data for beamforming.

Abstract: A head-mounted display (HMD) system includes an HMD device wearable upon a head of a user, and a peripheral device that is dockable with the HMD device. The peripheral device comprises a plurality of light source elements disposed along a perimeter of a face of the peripheral device and a peripheral electronic control system. The peripheral electronic control system is configured to form an optically detectable light pattern with the plurality of light source elements by controlling each of the light source elements. The HMD device is configured to detect the optically detectable light pattern with a camera and to display an augmented reality (AR) content based on the identified optically detectable light pattern.

Abstract: A helmet is provided that comprises a contoured external surface; a controller positioned on the contoured external surface; one or more channels embedded within the contoured external surface and defining two or more elongate pathways travelling over at least a portion of the contoured external surface; at least one electroluminescent (EL) wire located within and extending along at least a portion of the one or more channels, the EL wire being further selectively electrically connected to the controller; and a plurality of pairs of retaining elements periodically positioned adjacent the one or more channels. Each retaining element within each pair is located on an opposing side of the one or more channels, and an opening defined between a portion of each of the plurality of pairs of retaining elements has a dimension less than a diameter of the EL wire. Associated method and computer program product are also provided.

Abstract: Provided is a wearable audio input/output device. The wearable audio input/output device is provided with a frame, a first audio collection unit, a second audio collection unit, and a first speaker. The frame can be mounted to a user. The first audio collection unit is provided on the frame. The second audio collection unit is provided on the frame. The second audio collection unit is arranged such that the distance between the first audio collection unit and mouth of the user is less than the distance between the second audio collection unit and the mouth of the user. The first speaker is provided on the frame between the first audio collection unit and the second audio collection unit.

Abstract: A protective football helmet is provided having a one-piece molded shell with an impact attenuation system. This system includes an impact attenuation member formed in an extent of the front shell portion by removing material from the front portion. The impact attenuation member is purposely engineered to change how the front portion responds to an impact force applied substantially normal to the front portion as compared to how other portions of the shell respond to that impact force. In one version, the impact attenuation member is a cantilevered segment formed in the front portion of the shell.

Abstract: The present disclosure includes a retrofit sensor module for use with a protective head top with a helmet and a visor. The sensor module includes a sensor housing and an attachment mechanism. The sensor housing encloses a head presence sensor to sense when the protective head top is being worn. The sensor housing also encloses a position sensor to sense the position of the visor relative to the helmet. The retrofit sensor module further comprises an attachment mechanism secured to the housing. The attachment mechanism mates with a first hinge component of a hinge assembly in the protective head top to removably install the sensor module into the protective head top, wherein the hinge assembly allows the visor to move relative to the helmet.

Abstract: An image display device including: an image formation device; and an optical system that brings an image from the image formation device to an eyeball of an observer. 0 (degrees)??2<?1?25 is satisfied where an image-formation-device first strike point is where an extended line of an optical axis of the optical system intersects with an image exit surface of the image formation device, a first normal line is normal to the image exit surface of the image formation device passing through the first strike point, an image-formation-device second strike point is where an extended line of a pupil center line of the eyeball of the observer intersects with the image exit surface of the image formation device, a second normal line is normal to the image exit surface of the image formation device passing through the second strike point.

Abstract: A system for monitoring injuries comprising a plurality of wearable user input devices and a wireless transceiver. Each of the plurality of wearable user input devices may be configured to detect motion patterns of a user. Each of the plurality of wearable user input devices may be configured as performance equipment. The wireless transceiver may be configured to communicate the motion patterns to a user device. The user device may be configured to (i) develop and store reference patterns related to impacts, (ii) compare the detected motion patterns with the reference patterns, (iii) estimate a location and direction of an impact based on the comparison, (iv) accumulate data from the estimated impact with previously suffered impact data, (v) aggregate results based on the accumulated impact data and context information and (vi) generate feedback for the user based on the aggregated results.

Abstract: A head mounted device for a helmet includes a connection module, a flexible bracket, a power supply seat and a function module. While the flexible bracket is moved relative to the connection module, a position of the power supply seat relative to the helmet is adjusted. While the function module is moved relative to the power supply seat, an orientation of the function unit is adjusted.

Abstract: A head-mounted display includes an image display device displaying an image, a mounting member that is fixed to a head of a user, a first ball joint capable of moving and holding the image display device relative to the mounting member and a second ball joint. The first ball joint can move the image display device relative to the mounting member with a first degree of freedom or a third degree of freedom smaller than the first degree of freedom. A socket can selectively change a degree of freedom of the first ball joint between the first degree of freedom and the third degree of freedom.

Abstract: Methods for quantifying pupil swim are disclosed in order to compensate for the same. A target image, in one embodiment, is displayed on a display of a head mounted display (HMD). Images of the target image are captured from a plurality of positions relative to an optical axis of an optics block of the HMD at an exit pupil of the HMD. The target image includes features and differences between observed locations of the features and their expected locations absent the optics block are determined. From these differences, a wavefront of the optics block is reconstructed and distortion corrections for the optics block are generated using the wavefront. The distortion corrections, when applied to a virtual scene, add pre-distortion that is canceled by the optical imperfections of the optics block as light of the virtual scene with the pre-distortion passes through the optics block.

Abstract: The present disclosure is for a luminous helmet, comprising an outer shell configured to fit over a human head, an inner shell, a light-emitting band arranged along an elongated slit opening on the outer shell, and a light transmitting groove enclosing the light emitting band. In the manufacturing process, the outer shell was formed first, with a slit cut to match the light transmitting groove. The light-transmitting groove, comprising fixing grooves, engage fixing strips extending from edges of the outer shell along the slit opening. This structure then serves as a base to house the light-emitting band, and to receive pressure injection of the inner shell material.

Abstract: A helmet comprising a first protective layer, the first protective layer comprising at least one accessory mount portion for receiving an accessory mount or an accessory, the at least one accessory mount portion being arranged integrally as a part of the first protective layer and configured to disintegrate from the rest of the first protective layer in response to a mechanical impact to the at least one accessory mount portion for preventing the accessory mount portion and/or the accessory from penetrating through the helmet.

Abstract: A night vision goggle adapter, the adapter includes a knob, a yoke, the yoke includes an attachment portion operably connected to a helmet mount, a spring operably placed between the knob and yoke, a shaft, the shaft includes a first end operably connected with the knob, and a second end, a head, the head receives a portion of the shaft and is attached to a night vision goggle, and a cam pivotally mounted to the second end of the shaft for movement between a release and clamped position to respectively disengage and engage the adapter to the head.

Abstract: A night vision goggle adapter, the adapter includes a knob, a yoke, the yoke includes an attachment portion operably connected to a helmet mount, a spring operably placed between the knob and yoke, a shaft, the shaft includes a first end operably connected with the knob, and a second end, a head, the head receives a portion of the shaft and is attached to a night vision google, and a cam pivotally mounted to the second end of the shaft for movement between a release and clamped position to respectively disengage and engage the adapter to the head.

Abstract: A system for mitigating an impact force is provided. The system a helmet having a face mask attached thereto, and the face mask includes a first portion; and a second portion. The first portion and the second portion are separated by a gap and held together via a biasing member. A force received by the first portion is at least partially transferred to the second portion via the biasing member, wherein a fraction of the transferred force is returned to the first portion, the fraction being less than the force received.

Abstract: A lighting device comprising an improved hinge assembly, and methods of assembly thereof, are disclosed.

Abstract: A head-mounted-display adjustment apparatus may include a spring with a restoring force that is, within an elastic limit of the spring, substantially disproportional to deflection of the spring. The adjustment apparatus may also include a mount that couples the spring to a head-mounted display. In addition, the adjustment apparatus may include a strap with a distal section coupled to the head-mounted display and a proximal section coupled to the spring such that (1) the strap is extendable, via deflection of the spring, away from the head-mounted display and (2) when a user is wearing the head-mounted display, the restoring force of the spring holds, via the strap, the head-mounted display against the user's face. Various other head-mounted-display adjustment devices, systems, and methods are also disclosed.

Abstract: The present disclosure includes a retrofit sensor module for use with a protective head top with a helmet and a visor. The sensor module includes a sensor housing and an attachment mechanism. The sensor housing encloses a head presence sensor to sense when the protective head top is being worn. The sensor housing also encloses a position sensor to sense the position of the visor relative to the helmet. The retrofit sensor module further comprises an attachment mechanism secured to the housing. The attachment mechanism mates with a first hinge component of a hinge assembly in the protective head top to removably install the sensor module into the protective head top, wherein the hinge assembly allows the visor to move relative to the helmet.