43 results about "Partial coherence" patented technology

A simplified coherency controller supports multiple exclusively active fully coherent agent interfaces and any number of active I / O (partially) coherent agent interfaces. A state controller determines which fully coherent agent is active. Multiple fully coherent agents can be simultaneously active during a short period of a transition of processing from one to another processor. Multiple fully coherent agents can be simultaneously active, though without a mutually consistent view of memory, which is practical in cases such as when running multiple operating systems on different processors.

A partial coherence interferometer incorporates a focusing system for resolving measurement ambiguities. A focus-sensing beam is directed through a common objective with the measurement beam of the interferometer for conveying the beams to and from a test surface. An unambiguous measuring range is equated to a predetermined range of focusing errors.

A zero power identical pair of oppositely-oriented meniscus lens elements mounted in the projection light path, serves as curved mask support while compensating for optical anomalies such as beam shift and beam deviations produced by other transparent supports for the curved mask. The zero-power meniscus lens pair, without affecting the transmission beam characteristics, lets the beam diffract as efficiently as does a regular planar mask, thus preserving the partial coherence effects and resolution concepts of projection lithography. This simple but novel optics device is not only expected to clear several barriers for curved mask projection lithography but also find place in other applications where collimated or converging light beams have to travel extra paths without significant aberration.

A laser therapy method and apparatus is disclosed. The optical coherence property of the therapy laser is actively controlled to provide optimum therapy results for difference types of biological tissue and body parts.

The present invention describes an apparatus comprising an optical array generating a distribution of partial coherence of light energy and an aperture to select a subset of said distribution of partial coherence.

A method for identifying non-stationary sound source characteristics using partial coherence technology belongs to the field of noise in physics. In the case where multiple sound sources generate complex cyclostationary sound fields, the present invention adopts cyclostationary theory instead of Fourier transform, proposes a partial coherence analysis technology suitable for cyclostationary sound fields, and uses it in the partial sound field separation of cyclostationary sound fields, the method As follows: first determine the number and location of the reference source, arrange the reference source microphone array, extract the reference source signal, then design the microphone array to scan and measure the holographic surface, collect the holographic surface data, and then use the cyclostationary partial coherence analysis technology to separate Part of the sound field for each sound source. The present invention can analyze the complex cyclostationary sound field formed by multiple cyclostationary sound sources, obtain the partial sound field formed by each sound source, and also calculate the three-dimensional sound field formed by a single sound source from the sound pressure signal measured on the holographic plane. The sound field distribution realizes the visualization of the propagation path of each sound source.

The invention discloses a system and method for carrying out in-situ detection on the odd aberration of a projection objective for photoetching machines. The system comprises a light source, a lighting system, a masking platform, a mask, a projection objective, an operating platform, an image sensing device, an interferometer and a data processing device, wherein the mask contains a detection mark, and the interferometer is used for position control. The method comprises the following steps: calibrating corresponding odd-aberration sensitivity coefficients of the projection objective through setting different partial coherence factors and numerical apertures; then, measuring the value of difference between the peak value and light intensity of a space image of the detection mark by using the image sensing device; and finally calculating the odd aberration of the projection objective by using the calibrated odd-aberration sensitivity coefficients. The system and method disclosed by theinvention have the advantage of improving the accuracy of detection on the odd aberration of the projection objective for photoetching machines.

The invention discloses a system used for producing a Laguerre-Gaussian correlated partial coherence gauss beam. The system comprises a beam expander, a spatial light modulator, a beam shrinking mirror, a ground glass sheet, a lens and a Gaussian filter sheet along the direction of light in sequence. A computer-generated hologram forms a computer-generated holographic grating after being loaded on the spatial light modulator, and then a Laguerre-Gaussian beam with only an angular module is produced. The beam shrinking mirror is used for controlling the spot size of the Laguerre-Gaussian gauss beam on the rotary ground glass sheet to adjust coherence of an outgoing beam. The ground glass sheet is used for changing the Laguerre-Gaussian gauss beam to the Laguerre-Gaussian correlated partial coherence gauss beam. The lens is used for collimation of the partial coherence gauss beam. The Gaussian filter sheet is used for converting light distribution of the beam to Gaussian distribution. Due to flexibility of the computer-generated hologram, Laguerre-Gaussian beams with different orders and only angular modules can be produced by producing different holograms, and therefore Laguerre-Gaussian correlated partial coherence gauss beams with different orders are produced.