Optical articles including a spatially defined arrangement of a plurality of data rich retroreflective elements, wherein the plurality of retroreflective elements comprise retroreflective elements having at least two different retroreflective properties and at least two different optical contrasts with respect to a background substrate when observed within an ultraviolet spectrum, a visible spectrum, a near-infrared spectrum, or a combination thereof.

Interactive drop cloths are disclosed herein. An example interactive drop cloth includes a safety drop cloth, one or more audio output devices integrated into one or more corners of the safety drop cloth, and a controller that causes an audible alert message to be output by the one or more audio output devices.

Systems and methods for generating real images via retroreflection are provided. An image source may project light beams, which are received at a beam splitter. The beam splitter, positioned between a retroreflector and a viewing area, may reflect the light beams toward the retroreflector. In turn, the light beams may be reflected back from the retroreflector and toward and through the beam splitter to generate a real image that appears to a viewer to be floating in the viewing area. A controller may control the image source to adjust the real image based on a control parameter detected by at least one sensor.

Systems and methods for generating real images via retroreflection are provided. An image source may project light beams, which are received at a beam splitter. The beam splitter, positioned between a retroreflector and a viewing area, may reflect the light beams toward the retroreflector. In turn, the light beams may be reflected back from the retroreflector and toward and through the beam splitter to generate a real image that appears to a viewer to be floating in the viewing area. A controller may control the image source to adjust the real image based on a control parameter detected by at least one sensor.

The present disclosure includes in one instance an optical article comprising a data rich plurality of retroreflective meats that are configured in a spatially defined arrangement, where the plurality of retroreflective elements comprise retroreflective elements having at least two different retroreflective properties, and where data rich means information that is readily machine interpretable. The present disclosure also includes a system comprising the previously mentioned optical article, an optical system, and an inference engine for interpreting and classifying the plurality of retroreflective elements wherein the optical system feeds data to the inference engine.

Provided is a wavelength conversion member including: a wavelength conversion layer including at least one kind of quantum dots that are excited by excitation light to emit fluorescence and are dispersed in an organic matrix; and a barrier layer that is provided adjacent to at least one main surface of the wavelength conversion layer and includes silicon nitride and/or silicon oxynitride as a major component, in which the organic matrix is obtained by curing a curable composition including at least an alicyclic epoxy compound and includes a chemical structure A which is bonded to silicon nitride and/or silicon oxynitride as a major component of the barrier layer.

Provided is a wavelength conversion member including: a wavelength conversion layer including at least one kind of quantum dots that are excited by excitation light to emit fluorescence and are dispersed in an organic matrix; and a barrier layer that is provided adjacent to at least one main surface of the wavelength conversion layer and includes silicon nitride and/or silicon oxynitride as a major component, in which the organic matrix is obtained by curing a curable composition including at least an alicyclic epoxy compound and includes a chemical structure A which is bonded to silicon nitride and/or silicon oxynitride as a major component of the barrier layer.

Spectroscopic probe light shields coupled to the end of an optical probe improve user safety, reduce unwanted stray light and enhance signal collection from a liquid or gaseous sample. Apertured inner and outer baffles with offset perforations allow a sample to flow through the baffles and past a counter-propagating focused or collimated excitation/collection beam. The spectroscopic probe may be a Raman or fluorescence probe, operating in the UV-visible or mid-IR region of the spectrum. The inner shield may include a retro-reflector to amplify light collection from the sample, or the inner shield may include a light absorber to reduce the intensity of a scattered excitation beam. One or both of the inner and outer shields may be cylindrical, and the apertures in the baffles may be slots, circles or other shapes. The baffle(s) may be adapted for temporary, permanent, or semi-permanent attachment to the distal end of the probe optic.

A method of marking prismatic retroreflective sheeting includes providing prismatic retroreflective sheeting having a front side and a back side, the back side having prismatic features and directing a radiation source at the back side of the prismatic retroreflective sheeting and irradiating a plurality of the prismatic features. The radiation forms a mark in the prismatic retroreflective sheeting.

A license plate assembly includes a backing and a flexible license plate. The flexible license plate includes plural layers, including a licensing-information layer, in which ink is deposited in the form of alphanumeric characters on an underlying one of the plural layers, the alphanumeric characters providing license information. The flexible license plate optionally includes one or more holograms, and/or watermarks, and/or QR-codes. The flexible license plate is disposed on the backing, which extends beyond the perimeter of the flexible license plate, defining a marginal region. In some embodiments, plural indices are disposed in the marginal region to facilitate alignment of flexible license plate during installation thereof on a motor vehicle.