A system and method for determining eye surface contour using multifocal keratometry is disclosed. The system includes a light source, a light detector, a processor, a non-transitory machine-readable medium communicatively coupled to the processor, and instructions stored on the non-transitory machine-readable medium. The instructions, when loaded and executed by the processor, cause the processor to project a light, using the light source, onto a plurality of surfaces of an eye; create, using the light detector, an image of a plurality of reflections, each of the plurality of reflections created by reflecting the light off of one of the plurality of surfaces of the eye; determine that the plurality of reflections are in focus in the image; and calculate, based on the determination, a curvature of the plurality of surfaces of the eye based on the image.

A light source capable of spectral modulation is modulated conventionally to produce a correlogram at the test surface position of an SCI interferometer. The mean wavelength of the light source is changed to obtain multiple corresponding phase-shifted correlograms that can be processed by applying conventional multiple-wavelength interferometric analysis to determine physical attributes of the test surface. One simple way to achieve this result is by splitting the light beam produced by the source into at least three simultaneous beams passed through filters with corresponding different mean-wavelength transmission bands. Because the correlograms are produced simultaneously, they can be used to practice instantaneous phase-shifting interferometry using conventional analysis algorithms.

The present invention relates to a method, and a corresponding device, for testing a radius of curvature and/or for detecting inhomogeneities of a curved X-ray grating for a grating-based X-ray imaging device. The method comprises generating a beam of light diverging from a source point, propagating along a main optical axis and having a line-shaped beam profile. The method comprises reflecting the beam off a concave reflective surface of the grating. A principal axis of the concave reflective surface coincides with the main optical axis and the source point is at a predetermined distance from a point where the main optical axis intersects the concave reflective surface. The method comprises determining whether a projection of the reflected beam in a plane at or near the source point is present outside a central region around the source point, in which an absence of this projection outside the central region indicates that a radius of curvature of the concave reflective surface corresponds to the predetermined distance and/or that the reflective surface is substantially homogeneously curved along a curve formed by the beam impinging on the concave reflective surface.

A surface inspection apparatus includes: an inspection pattern forming unit that forms inspection patterns; a projection unit that projects the inspection patterns onto an inspection target object; a captured image acquiring unit that acquires captured images of the inspection target object; an edge extraction image creating unit that extracts edges from captured images, and creates edge extraction images; a correction coefficient setting unit that sets a correction coefficient for correcting intensities of edges in the edge extraction image; an intensity correcting unit that corrects the intensities of the edges; a corrected edge extraction image creating unit that creates corrected edge extraction images; an integrated image creating unit that creates a single integrated image by integrating the brightness values at the same position of the inspection target object; and a determination unit that determines the presence or absence of unevenness on a surface of the inspection target object.

An inner circumferential length measuring device for a circular member includes a two-dimensional sensor disposed at a predetermined measurement position facing an inner circumferential surface of a circular member placed flat in an unrestrained state on a support. By the two-dimensional sensor being rotated about a rotation shaft of a predetermined position inward of the circular member, a separation distance from the two-dimensional sensor to the inner circumferential surface is measured by the two-dimensional sensor in a non-contact state with the circular member in a range of an entire circumference of the circular member. A calculation unit calculates an inner circumferential length of the circular member based on the separation distance measured and a distance from the rotation shaft to the two-dimensional sensor.

An inner circumferential length measuring device for a circular member includes a two-dimensional sensor disposed at a predetermined measurement position facing an inner circumferential surface of a circular member placed flat in an unrestrained state on a support. By the two-dimensional sensor being rotated about a rotation shaft of a predetermined position inward of the circular member, a separation distance from the two-dimensional sensor to the inner circumferential surface is measured by the two-dimensional sensor in a non-contact state with the circular member in a range of an entire circumference of the circular member. A calculation unit calculates an inner circumferential length of the circular member based on the separation distance measured and a distance from the rotation shaft to the two-dimensional sensor.

Systems, methods, and computer program products for measurement of surface properties using a mobile device are described, the surface properties including interfacial (surface) tension, contact angle (static, advancing, or receding), solid surface energy, and rolling or sliding angle on an inclined surface. The system has a support adapted to receive a mobile device with a camera and a processor. A structure is coupled to the support that is adapted to removably receive measurement components. The measurement components are configurable to place a droplet or a bubble within a field of view of the camera. Software on the mobile device is configured to operate the camera to take an image of the droplet or the bubble within the field of view of the camera, and to determine one or more physical properties of the droplet or the bubble based on an analysis of the image.

Systems, methods, and computer program products for measurement of surface properties using a mobile device are described, the surface properties including interfacial (surface) tension, contact angle (static, advancing, or receding), solid surface energy, and rolling or sliding angle on an inclined surface. The system has a support adapted to receive a mobile device with a camera and a processor. A structure is coupled to the support that is adapted to removably receive measurement components. The measurement components are configurable to place a droplet or a bubble within a field of view of the camera. Software on the mobile device is configured to operate the camera to take an image of the droplet or the bubble within the field of view of the camera, and to determine one or more physical properties of the droplet or the bubble based on an analysis of the image.

In Inertial Confinement Fusion (ICF) targets that ignite a fuel section having a low areal density at ignition, the fuel section tends to have a very non-uniform temperature profile. As the areal density decreases, the temperature profile becomes less uniform. This leads to non-equilibrium ignition and a non-uniform density profile. However, there is an optimal material and content for the fuel region for any given target design. One can smooth both the temperature and density profiles in the fuel of non-equilibrium ignition targets while still allowing runaway burn but preventing margin parameters such as fall-line from being affected greatly.

In Inertial Confinement Fusion (ICF) targets that ignite a fuel section having a low areal density at ignition, the fuel section tends to have a very non-uniform temperature profile. As the areal density decreases, the temperature profile becomes less uniform. This leads to non-equilibrium ignition and a non-uniform density profile. However, there is an optimal material and content for the fuel region for any given target design. One can smooth both the temperature and density profiles in the fuel of non-equilibrium ignition targets while still allowing runaway burn but preventing margin parameters such as fall-line from being affected greatly.