A system may have a rechargeable hearing instrument with a power source, an ultraviolet (UV) sensor configured to convert received UV light into electrical power and charging circuitry coupled to the UV sensor and to the power source. The charging circuitry may use the electrical power to charge the power source. A charger may have a charging cavity configured to receive the rechargeable hearing instrument. A power source within the charger powers a UV light source located within the charger configured to provide UV light to the UV sensor of the rechargeable hearing instrument when the rechargeable hearing instrument is placed within the charging cavity.

The present disclosure provides for UV-responsive laminates including a first layer having a photochromatic pigment arranged as a pigment texture, or one or more photochromatic indicators, or combinations thereof. The photochromatic pigment may be disposed on the laminate during laminate fabrication, prior to installation of the laminate, or in-situ, subsequent to installation. The photochromatic pigment is configured to change from a first state to a second state in response to exposure to an ultraviolet (UV) light source, the first state is invisible to a naked eye under ambient lighting and the second state is visible to the naked eye under ambient lighting. The UV-responsive laminates may further include additional layers, such as a second layer which may be a coupling layer configured to removably couple the laminate to a component. Additional layers, such as a protective layer or a backing layer, may be included in the UV-responsive laminate as well.

A method and system for personal environmental monitoring using a mobile device are provided herein. The method may include: determining an ultraviolet index, UVI, in the vicinity of the mobile device, based on data received from the mobile device; determining a modified UVI, m-UVI, based on at least one of further data received from the mobile device and data input by a user of the mobile device; determining a predicted exposure of the user of the mobile device, based on the m-UVI; determining a minimal erythemal dose, MED, of the user based on an input skin type of the user; providing an erythema timer based on the m-UVI and the MED; and continually updating the erythema timer based on changing environmental or user conditions, wherein the received data corresponds to at least one of: a current time; a geolocation of the mobile device; and an altitude of the mobile device.

An optical sensor device comprises a first and a second optical sensor arrangement. In the first optical sensor arrangement at least one optical sensor structure measures the incidence angle of incoming light that is approximately on the main beam axis of a light source. The second optical sensor arrangement comprises at least one optical sensor structure with at least one optical sensor, at least two metal layers and opaque walls optically isolating the optical sensor. An evaluation circuit provides an output signal of the second optical sensor arrangement under the condition that the incidence angle measured by the first optical sensor arrangement lies within a set interval.

System and methods for accurate measurement and real-time feedback of solar ultraviolet exposure for management of ultraviolet dose. The systems can include a wearable device and a mobile device, the system performing accurate measurement of UV exposure.

Disclosed are an ultraviolet mirror device and a method therefor. The ultraviolet mirror device of the present invention relates to a device that can generate an image obtained by capturing an image of skin in the ultraviolet region. The device can be connected to a portable terminal having a display unit, so as to be used as an ultraviolet mirror. To this end, the ultraviolet mirror device includes an ultraviolet filtering unit provided in a front portion or a rear portion of the lens unit to allow ultraviolet light to pass therethrough and thus enter the image sensor; and an image processing unit providing the portable terminal with multiple digital images generated at a predetermined frame rate per second by the image sensor and thus allowing a moving image to be regenerated in the display unit.

Method, device (100) and system (200) for detection and quantification of the variation of eye damage caused by the blue and violet light of the visible spectrum comprising the steps of detecting the incident radiation on an individual's visual system; calculating the incident radiation within the range between 380 and 500 nm; establishing at least one threshold of incident radiation within said range; detecting if at least one threshold established for said range has been exceeded; warning of the excess of at least one threshold; measuring the exposure time to incident radiation; and inferring in the different ocular structures of an individual the effect of incident radiation and warning of such effect.

A system and method for stimulating light sensors (e.g., UV) using a hand-held stimulator. The hand-held stimulator is portable and configurable to store a plurality of routines comprising various light signatures. In some cases, the signature is a threat signature (e.g., missile, RPG, and/or gunfire) and the stimulator is used as part of system integration, field and flight line, and/or lab testing for systems utilizing light sensors.

[Object] To reduce the influence on a visible light LED exerted by ultraviolet light applied by an ultraviolet light LED. [Solution] A linear light source including an ultraviolet light emitting diode (1a), a visible light emitting diode (3a), and a light guide (5). The ultraviolet light emitting diode (1a) and the visible light emitting diode (3a) are disposed at least at one end in an optical axis direction of the light guide (5), and are disposed with an optical axis shifted and by providing a level difference in the optical axis direction. Here, the ultraviolet light emitting diode (1a) and the visible light emitting diode (3a) are mounted on an inverted L-shaped heat sink (6a), and an ultraviolet light blocking filter (2) is disposed in front of the visible light emitting diode (3a).

Radiation detectors based on high electron mobility transistors (HEMTs) are provided. Methods for detecting ultraviolet radiation using the HEMTs are also provided. The transistors are constructed from an intrinsic high bandgap semiconductor material with a built-in polarization field sandwiched between graphene and a two-dimensional electron gas (2DEG).