32 results about "Wavefront curvature" patented technology

An image display device for optically displaying an image is disclosed. This device includes: a light source; an imaging-light generator converting light emitted from the light source, into imaging light representative of the image to be displayed, to thereby generate the imaging light; a relay optical system focusing the imaging light emitted from the imaging-light generator, on an image plane which is located at an optically conjugate position to the imaging-light generator, the relay optical system defining a pupil through which the imaging light passes, within the relay optical system; a variable-focus lens disposed at a position generally coincident with the pupil, the variable-focus lens having a varying focal length; and a wavefront-curvature adjuster configured to vary the focal length by operating the variable-focus lens, to thereby adjust a wavefront curvature of the imaging light emitted from the relay optical system.

An apparatus is disclosed for displaying to a viewer an image stereoscopically representing a three-dimensional object to be displayed. The apparatus includes: an emitter emitting light, having an intensity modulating section capable of intensity modulation for modulating an intensity of the light emitted from the emitter; a wavefront-curvature modulator capable of wavefront-curvature modulation for modulating a curvature of wavefront of the light emitted from the emitter; and a controller controlling the intensity modulation and the wavefront-curvature modulation, based on a luminance signal indicative of luminance of the image, and a depth signal indicative of depth of the image. The depth signal is a signal corresponding to depth data produced in a rendering process for the object to be displayed.

A differential curvature sensing device for measuring a wavefront curvature by employing increased spatial sampling for wavefront testing with mid-frequency error recovery. The device includes a sampling sensor having an output beam, an optical element to split said output beam, a lenslet array in the path of each beam to generate corresponding sampling grids, a shearing element for shifting the grid points in horizontal and vertical directions to produce plural sampling grids having plural grid points for use generating a spatial sampling grid having a density for mid-spatial frequency recovery. The displacement of the shifting less than a pitch size of the lenslet array, and a measuring device measuring plural slopes of plural wavefronts at each grid point to obtain a wavefront normal curvature and corresponding twist curvature terms to determine a principal curvature and directions. The sensor is a Shack-Hartman sensor, shearing interferometer sensor and other discrete-point sampling sensors.

An optical scanning device having: a light source for emitting a light beam; a deflector having a plurality of flat reflecting surfaces; a first optical system disposed between the light source and the deflector; and a second optical system disposed between the deflector and a photoreceptor surface, and configured such that the reflecting surfaces of the deflector and the photoreceptor surface are conjugated in a sub-scanning direction at every deflection angle in a main-scanning range. In the optical scanning device, the light beam traveling from the first optical system to the deflector has a width greater than a dimension in a main-scanning direction of each reflecting surface of the deflector, and the light beam passes through different portions of the first optical system depending on whether the light beam is to be deflected by the deflector to be directed to an edge portion of the main-scanning range or to be directed to a center portion of the main-scanning range such that the light beam traveling to the deflector has a smaller average wavefront curvature in a sub-scanning direction when the light beam is to be deflected by the deflector to be directed to an edge portion of the main-scanning range than when the light beam is to be deflected by the deflector to be directed to the center portion of the main-scanning range.

The invention provides a method for optimizing the stacking parameters of a seismic common reflection surface, which includes the following steps: S1, acquiring seismic data, and acquiring the wavefront curvature radius of an initial reflection point and the wavefront curvature radius and inclination angle of an initial reflection surface based on the seismic data; and S2, acquiring the optimal values of the wavefront curvature radius of the initial reflection point and the wavefront curvature radius and inclination angle of the initial reflection surface according to the wavefront curvature radius of the initial reflection point and the wavefront curvature radius and inclination angle of the initial reflection surface and based on an objective function. The invention provides a method foroptimizing the stacking parameters of a seismic common reflection surface. In the first step, three initial parameters are found, the initial parameters are searched one by one, and simple linear search can be used. In the second step, an optimal combination solution is searched near the initial parameters by using a global optimization algorithm. Thus, the problem on how to fast scan the CRS imaging parameters by a CMAES algorithm is solved.

The invention discloses a digital holography-based three-dimensional micro-observation apparatus for cell dynamic of a living organism. According to the apparatus provided in the invention, a microscopic technology of digital holography is employed, so that dynamic three-dimensional microscopic observation without contact, damage and pretreatment on a cell of a living organism can be realized; a fiber optical path is utilized to realize object light illumination and an optical path portion of the object light employs a vertical type structure, so that it is convenient to carry out observationon the cell of the living organism; reference light utilizes a light beam turnover device to control an included angle between the reference light and the object light so as to realize off-axis digitholography; and an infinite distance correction microscopic object lens is employed to carry out pre-amplification and imaging on the cell; simultaneously, a relay lens is utilized to adjust an imaging position and a wavefront curvature of the object light, so that observation resolution is improved. According to the apparatus, layout structures of a plurality of optical elements are compact, flexible and stable thorough a platform; moreover, the apparatus can be applied to dynamic observation on the cell of the living organism for a long time.

A tunable, achromatizing optical system for use with a broadband imaging modality system for imaging objects having a range of longitudinal chromatic aberration (LCA) values. The optical system includes an achromatizing component and a parfocal component, for example, a zoom system. A method for tuning the wavefront curvature of different chromatic components of objects having a range of longitudinal chromatic aberration (LCA) values when imaged by a broadband imaging modality system includes the steps of providing a broadband imaging modality system having an entrance pupil, for imaging an object having longitudinal chromatic aberration; providing a tunable, achromatizing optical system; and varying the focal length of the parfocal component while maintaining a conjugate relationship between the achromatizing component and the entrance pupil of the broadband imaging modality system.

The invention discloses a method for measuring focal length and equivalent f-number with a grating type wavefront curvature sensor. In the method, a defocused wavefront with the focal length to be measured is generated by transmission or reflection, and the defocused wavefront is incident into the grating type wavefront curvature sensor, and the grating type wavefront curvature sensor is used to detect the defocused light spots on the two defocused surfaces , measure the diameter d1 of the front defocused spot and the back defocused spot d2, and obtain the equivalent focal length fg of the defocus grating and the focal length fi of the short focal length lens according to the design parameters of the grating wavefront curvature sensor; ③. Calculate the diameter d1 of the two defocused spots The normalized difference S between d2 and d2; ④. Determine the positional relationship of the obtained two defocused light spots, and calculate the focal length or equivalent f-number through different formulas. The invention has the advantages of high measurement accuracy, wide application range, low cost and the like.