A dispersion measuring device includes a pulsed laser light source, a pulse forming unit, a correlator, and an arithmetic operation unit. The pulse forming unit forms an optical pulse train from an optical pulse output from the pulsed laser light source. The correlator detects a temporal waveform of correlated light formed from the optical pulse train. The arithmetic operation unit estimates a wavelength dispersion amount of an optical component disposed between the pulsed laser light source and the correlator, based on the temporal waveform of the correlated light. A dispersion medium gives a group delay dispersion to the optical pulse train to increase the peak intensity of the correlated light to be equal to or greater than a threshold value of the correlator. The pulse forming unit gives a group delay dispersion having a sign opposite to the group delay dispersion given to the optical pulse train to the optical pulse.

A dispersion measuring device includes a pulse forming unit, a light detection unit, a control unit, and an arithmetic operation unit. The control unit selectively outputs a first phase pattern and a second phase pattern. The pulse forming unit forms an optical pulse train from initial pulsed light, the optical pulse train including a plurality of optical pulses having a time difference from each other and having different center wavelengths from each other. The light detection unit detects a temporal waveform of the optical pulse train. The arithmetic operation unit estimates a wavelength dispersion amount of a measurement object based on a feature amount of the temporal waveform of the optical pulse train. When the first phase pattern is output, a pulse having a long center wavelength is generated first. When the second phase pattern is output, a pulse having a short center wavelength is generated first.

A method includes introducing light into a glass article such that at least a portion of the introduced light is emitted from an edge of the glass article. The light emitted from an edge of the glass article is detected. An intensity profile of the emitted light is an intensity of the emitted light as a function of axial position. A first intensity boundary of the intensity profile and a second intensity boundary of the intensity profile are determined. A thickness of a layer of the glass article is determined based on an axial distance between the first intensity boundary and the second intensity boundary.

An optical encoder of the present invention includes a light-receiving element unit 5, moving slit 2 and fixed slit 3. The light-receiving element unit 5 includes a pattern 5B for detecting infiltration of liquid.

There are provided an antifog property evaluating apparatus and an antifog property evaluating method capable of quantitatively and objectively evaluating an antifog property in a more realistic situation. The antifog property evaluating apparatus includes: fogging generation devices configured to generate the fogging of a surface of a sample; an object disposed at a position different from that of the sample; an imaging device configured to image the object via the sample; and an evaluation device configured to evaluate the antifog property of the sample on the basis of object images acquired by imaging the object.

The present invention relates to a functionalized textile substrate with cyclodextrins and/or cyclodextrin derivatives and water- and/or oil-repellent agents, which combines the water- and/or oil-repellent functionality with odor-absorbing properties.

Conventionally, eyewear is rated in terms of its absorption coefficient (sometimes called the optical density (OD)) or the protection that it provides from ultraviolet (UV) radiation, which can damage the eye at high enough power levels. Infrared (IR) radiation can also damage the eye, but IR damage tends to occur at a much slower rate than UV-induced damage. Rating eyewear in terms of protection from IR radiation and/or in terms of a maximum safe exposure duration (SED) to IR radiation improves consumers' ability to protect themselves from IR radiation. In addition, eyewear rated for more IR protection or longer SED may still provide excellent vision thanks to coatings that reflect or absorb IR light and transmit visible light.

The present disclosure providing a method for measuring the liquid crystal efficiency of the liquid crystal layer to the incident light, the method includes: keeping the lower polarizing plate unchanged to make the upper polarizing plate and the lower polarizing of the liquid crystal layer in a first state; in the first state, controlling the brightness of the screen of the liquid crystal panel to be 0 gray and to be 255 to measure the brightness Lvx and Lvy of the target position of the liquid crystal panel, respectively; according to the brightness Lvx and the brightness Lvy, determining the liquid crystal efficiency of the liquid crystal layer to the incident light. By the above method, the present disclosure could be performed without disassembling the module, number of the measurements is few and simple, and the efficiency and the accuracy are high.

A device and a method for wavefront analysis. The device is designed for analysing the wavefront of at least one light wave passing through an optical system, and has at least one illumination mask (105, 205, 305, 405, 406, 407), at least one first grating (120, 220, 320, 420), at least one second grating (130, 230, 330, 430) arranged in the predefined plane and at least one detector (140, 240, 340, 440) for detecting said superimposition pattern. The at least one first grating has at least one first grating structure and generates an interferogram in a predefined plane from a wavefront to be analysed which proceeds from the illumination mask and passes through the optical system. The at least one second grating has at least one second grating structure and generates a superimposition pattern by the superimposition of the second grating structure with the interferogram generated by the first grating.

An inspection unit (10) for photochromic lenses (84) has a housing (12) defining an interior (14). At least one ultraviolet light source (32a, 32b) provides ultraviolet radiation into the housing interior (14). An inspection platform (54) is movable into and out of the housing interior (14) via at least one slide assembly (56). The inspection platform (54) includes a light table (58) having a translucent viewing area (62) and at least one inspection light source (64) located under the translucent viewing area (62).