In an embodiment, a device and method for identifying a change in a predetermined condition. The device is a patch injected with ink that transforms in response to a change in the predetermined condition, such as, a change in temperature or change in the ultraviolet (UV) index level. The ink includes thermochromic ink that transforms or identifiably changes based on a change in a temperature condition, and/or photochromic ink that transforms or identifiably changes based on a change in an UV index level condition. When temperature increases or decreases to reach one or more threshold temperature values, the thermochromic ink transforms in an identifiable manner to indicate a condition has be met. When the UV index level increase or decrease to reach one or more threshold UV index levels, the photochromic ink transforms in an identifiable manner to indicate that a condition has be met.

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.

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.

The invention relates to a UV light sensor produced in a CMOS method, comprising a substrate that has a surface, one or more sensor elements that detect radiation and are designed in said substrate, at least one passivation layer arranged over said substrate surface, and a functional layer that is arranged over said passivation layer and designed in the form of at least one filter. The problem addressed by the invention of providing a UV light sensor which is sensitive exclusively within the UV wavelength range is solved, in terms of arrangement, by means of filters designed directly on a planar passivation layer, and stray light suppressing means around said at least one sensor element and/or around the UV light sensor. In terms of the method, the problem is solved by measuring two output signal from at least two photo diodes fitted with different filters, and by determining a mathematical relationship between the two output signals.

To easily obtain a quantity of received light with computation by only measuring pulses of an electric signal related to a flame sensor, a flame detecting system is disclosed comprising: a flame sensor to detect light and a calculating device, in which the calculating device includes an applied voltage generating portion configured to generate a pulse to drive the flame sensor, a voltage detecting portion configured to measure an electric signal flowing in the flame sensor, a storing portion configured to store sensitivity parameters of the flame sensor in advance, and a central processing unit configured to obtain a quantity of received light of a flame using parameters of a known quantity of received light, a pulse width, and a discharge probability of the sensitivity parameters, and a discharge probability obtained from an actual pulse width and the measured number of discharge times.

A light intensity adjustable ultraviolet device for curing an optical fiber coating includes a cylindrical mounting base; a UVLED light source module mounted along a peripheral direction and an axial direction in an inner cavity of the cylindrical mounting base; a cylindrical focusing lens configured in front of a light emitting surface of the UVLED light source module, so that ultraviolet light emitted by the UVLED light source module is focused on a curing axis; and an ultraviolet sensor mounted in the inner cavity of the cylindrical mounting base, wherein the ultraviolet sensor is connected to a UVLED power supply control module via an ultraviolet intensity signal processing module; the UVLED power supply control module is connected to the UVLED light source module, so that an optical fiber drawing speed and an ultraviolet intensity form a control closed loop.

A method and associated EUV lithography apparatus for determining the phase angle at a free interface (17) of an optical element (13) provided with a multilayer coating (16) that reflects EUV radiation and/or for determining the thickness (d) of a contamination layer (26) formed on the multilayer coating (16). The multilayer coating (16) is irradiated with EUV radiation, a photocurrent (I.sub.P) generated during the irradiation is measured, and the phase angle at the free interface (17) and/or the thickness (d) of the contamination layer (26) is determined on the basis of a predefined relationship between the phase angle and/or the thickness (d) and the measured photocurrent (I.sub.P). The measured photocurrent (I.sub.P) is generated from the entire wavelength and angle-of-incidence distribution of the EUV radiation impinging on the multilayer coating (16).

Determining time spent outdoors. A method includes, at a first time, using one or more primary criteria including one or more criteria related to information provided by a first hardware input sensor on a device, to determine that the device is outdoors. The method further includes at one or more other times, using one or more secondary criteria, different than the primary criteria, the secondary criteria related to information provided by one or more second hardware input sensors, to determine continuity of the device being outdoors from the first time to the one or more other times. The method further includes based on determining that the device is outdoors and determining continuity of the device being outdoors from the first time to the one or more other times, identifying a total amount of time that the device has been outdoors.

Provided an ultraviolet-sensing sheet that facilitates measurement of ultraviolet irradiance over a wide area, that is suitable in ultraviolet irradiance in a range from 1 to 1,000 mJ/cm.sup.2, a method for manufacturing such an ultraviolet-sensing sheet, and a method for sensing ultraviolet. The ultraviolet-sensing sheet has a change in reflection density D1 of 0.2 or more over a range of cumulative illuminance 1 mJ/cm.sup.2 or more and less than 10 mJ/cm.sup.2, a change in reflection density D2 of 0.2 or more over a range of cumulative illuminance 10 mJ/cm.sup.2 or more and less than 100 mJ/cm.sup.2, and a change in reflection density D3 of 0.2 or more over a range of cumulative illuminance 100 mJ/cm.sup.2 or more and 1,000 mJ/cm.sup.2 or less, as measured at a wavelength of 365 nm when the ultraviolet-sensing sheet is irradiated with a high-pressure mercury lamp.

Systems and methods for monitoring ultraviolet (UV) light exposure in an environment are disclosed herein. The methods include detecting a UV light intensity within an environment at a plurality of spaced apart node locations and calculating a UV light intensity map based upon the UV light intensity at the plurality of spaced apart node locations. The systems include a distributed UV light exposure monitoring system that includes a plurality of UV detection nodes, a receiver, and a data analysis system. Each of the plurality of UV detection nodes includes a UV sensor configured to detect a UV light intensity at a node location and a transmitter configured to generate a UV intensity signal that is indicative of the UV light intensity. The data analysis system is programmed to calculate a UV light intensity map of the environment.