62 results about "Optical correlation" patented technology

Systems and methods of angle-resolved low coherence interferometry based optical correlation are disclosed. According to an aspect, a method includes directing a sample beam towards a sample for producing a scattered sample beam from the sample. The method also includes receiving the scattered sample beam at a multitude of scattering angles in at least two directions. Further, the method includes cross-correlating the scattered sample beam with a reference beam to produce a two-dimensional angle and depth resolved profile of the sample scattered beam. The method also includes processing the two-dimensional angle and depth scattered profile to obtain correlated information about scattering structures in the sample.

A method for determining a conjugate distance equation for automatic calibration in the execution of stereo-PIV(Particle Image Velocimetry) is provided to execute calibration of stereo-PIV even in a closed space or micro-channel. A method for determining a conjugate distance equation includes ate least two cameras and a single light slit. The cameras observe a region of the light slit in different directions, and point-to-point correspondence between the cameras is determined by moving and measuring each interrogation field in camera images according to optical correlation. The conjugate equation is decided using an approximation method according to internal and external camera parameters.

An optical device of an automotive vehicle comprises a first luminous source and a light duct designed to conduct light originating from the luminous source in the form of a beam with substantially parallel rays. The light duct comprises a rear face forming at least one reflecting facet designed to return some of the beam substantially along an optical axis (E) of the light duct. It also comprises a front face fashioned as at least one dioptric element associated optically with each reflecting facet and through which the light exits the light duct after return by the associated reflecting facet. Each dioptric element is configured so as to be stigmatic between a point in the substance of the light duct situated in immediate proximity to the center (Oi) of the associated reflecting facet and a point situated at infinity.

An atmospheric aberration sensor that uses two optically correlated images of a scene and the Fourier transform capabilities of a lens or other focusing element. The sensor receives light via an f-number matching element from a scene or from an external optical system and transmits it through a focusing optical element to an updateable display element such as a spatial light modulator or micro mirror array, which modulates the real time image from the focusing element with previous template image of the same extended scene. The modulated image is focused onto an autocorrelation detection sensor, which detects a change in centroid position corresponding to a change of the tip / tilt in the optical path. This peak shift is detected by centroid detection and corresponds to the magnitude of global wavefront tip / tilt. With a lenslet array and detector array, the system can also measure local tip / tilt and higher order aberrations.

The present invention relates to a discrete optical correlation system. One embodiment of the present invention includes a portable electrical illumination system and an optically opaque hollow module, configured to releasably couple to the portable electrical illumination system in a manner such that when the portable electrical illumination system is activated, the system produces a discrete correlated or focused illumination output. The portable electrical illumination system further includes a light emitting diode, a power source, a switch, and a coupling mechanism. The optically opaque hollow module further includes at least two openings, a hollow internal region, an optically opaque outer surface, and a coupling mechanism disposed on at least one of the at least two openings. A fourth embodiment relates creating an adjustable aperture between two optically opaque sleeves sliding over an optically transparent module coupled to the portable electrical illumination system.

A motion-sensing device is used to track motion of an object. The motion-sensing device includes an optical correlator, a motor system and a controller. The optical correlator has an imager. The optical correlator provides a feedback signal that indicates motion of the object in at least one dimension based on detected movement of an image of the object from a first location within the imager to a second location within the imager. The motor system can move the imager. The controller receives the feedback signal from the optical correlator and uses the feedback signal to calculate motion of the object and to control the motor system to move the imager so that the image of the object is returned to the first location within the imager.

A method of determining saturate, aromatic, resin, and asphaltene (SARA) fractions of a hydrocarbon fluid sample, including: i) microfluidic mixing that forms a mixture including the hydrocarbon fluid sample and a solvent fluid that dissolves asphaltenes; ii) performing optical spectroscopy on the hydrocarbon fluid sample-solvent fluid mixture resulting from i); iii) microfluidic mixing that forms a mixture including the hydrocarbon fluid sample and a titrant fluid that precipitates asphaltenes; iv) microfluidically precipitating asphaltenes from the hydrocarbon fluid sample titrant fluid mixture resulting from iii); v) performing a microfluidic filtering operation that removes precipitated asphaltenes from the mixture resulting from iv) while outputting permeate; vi) performing optical spectroscopy on the permeate resulting from v); vii) determining an asphaltene fraction percentage of the hydrocarbon fluid sample based on the optical spectroscopy performed in ii) and vi); viii) sequentially separating saturate-, aromatic-, and resin-containing portions from the permeate from v); ix) for each separating of viii), measuring an optical property of the respective saturate-, aromatic-, and resin-containing portions over time; and x) determining fraction percentages of saturates, aromatics, and resins in the hydrocarbon fluid sample based on the measured optical properties of ix) and respective mass-to-optical correlation data.