Abstract: A method for aligning the projection of a first light source with an in-coupler of a waveguide, the method including supplying a secondary light source through an optical path of the waveguide to exit at the in-coupler of the waveguide as an exit light; determining the concentricity of the exit light with respect to the first light source; and improving the concentricity of the exit light with respect to the first light source by adjusting the positioning of the first light source such that the exit light becomes concentric with the projection of the first light source.

Abstract: An electromagnetic wave-trapping device including two surfaces, each disposed in a plane, the two surfaces disposed at a first angle with respect to one another to form an opening, one of the two surfaces is configured to be orientated such that an incident electromagnetic ray through the opening, is disposed at a second angle with respect to the one of the two surfaces.

Abstract: A system for providing two parallel light beams spaced-apart a selectable distance, the system including: a first beam splitter configured for reflecting a light beam from a light source to create a first datum light beam, the first beam splitter is fixedly attached to a base; a second beam splitter configured for reflecting a transmitted light beam from the light beam from the light source to create a second datum light beam, a third beam splitter configured for reflecting a transmitted light beam from the light beam from the light source to create a third datum light beam, a fourth beam reflecting device configured for reflecting a transmitted light beam from the light beam from the light source to create a fourth light beam. Each of the second, third beam splitters and fourth beam reflecting device is configured to be slidingly attached to the base.

Abstract: A special-shaped plane reflecting mirror including a first reflecting mirror, a second reflecting mirror, a third reflecting mirror, a fourth reflecting mirror and a fifth reflecting mirror; wherein the second reflecting mirror and the fourth reflecting mirror are constructed the same and symmetrically arranged on both sides of the first reflecting mirror, the third and fifth reflecting mirrors have the same structure and are arranged symmetrically on both sides of the first reflecting mirror, the first reflecting mirror is placed at an angle of 45° with the horizontal plane, and the second reflecting mirror. The first mirror is placed at an angle of 45° with the horizontal plane, the angle between the reflection surface of the second mirror and the reflection surface of the first mirror is 165°, and the angle between the reflection surface of the third mirror and the reflection surface of the first mirror is 163°.

Abstract: A spot sub-pixel center positioning method based on pixel movement and cutting, the method includes driving the CCD image plane to move along the x direction and the y direction through a displacement platform, selecting target pixels to move and cut the spot, and recording the gray value change of the target pixels, constructing the mapping relationship between gray value and displacement, performing differential transformation on the gray value and displacement curve, and finally performing interpolation fitting to obtain the sub-pixel coordinate value of the center point of the light spot. The measurement accuracy can be maintained within ½ of the single-step displacement of cutting. The method is not only suitable for strong and weak distribution of light spots, but also for fully saturated light spots, and also for asymmetrically distributed and blurred edges. It also has a good measurement effect and can handle a variety of spot scenes.

Abstract: A method for locating a center of a field of view of an optical element using a system having a surface disposed at a first illumination, an image receiver, a blocker disposed at a second illumination, the method including disposing the blocker at, at least one location in the field of view upon the surface in a first direction when the brightness of an image within the field of view of the optical element is disposed at a brightness and recording a first location of the blocker; repeating the disposing step in a second direction and at the brightness, wherein the second direction is opposite the first direction and each of the first direction and the second direction is parallel to the surface; and averaging the first location and the second location to yield the center of the field of view of the optical element in the first direction.

Abstract: A system for providing two parallel light beams spaced-apart a selectable distance, the system including: a first beam splitter configured for reflecting a light beam from a light source to create a first datum light beam, the first beam splitter is fixedly attached to a base; a second beam splitter configured for reflecting a transmitted light beam from the light beam from the light source to create a second datum light beam, a third beam splitter configured for reflecting a transmitted light beam from the light beam from the light source to create a third datum light beam, a fourth beam reflecting device configured for reflecting a transmitted light beam from the light beam from the light source to create a fourth light beam. Each of the second, third beam splitters and fourth beam reflecting device is configured to be slidingly attached to the base.

Abstract: A method for controlling an autoexposure function of a camera to a gray level setting, the method including exposing an imaging device of the camera for a first exposure duration and obtaining a first gray level of the imaging device of the camera, exposing the imaging device of the camera for a second exposure duration within the first exposure duration and the maximum exposure duration and obtaining a second gray level of the imaging device of the camera, determining whether the first gray level and the second gray level are upward-trending from the first exposure duration to the second exposure duration and if the first gray level and the second gray level are determined to be upward-trending, interpolating for a target exposure duration based on the gray level setting, the first exposure duration and the first gray level.

Abstract: A system for providing two spaced-apart parallel light beams wherein the space between the two spaced-apart parallel light beams is adjustable, the system including a first beam splitter configured for reflecting a light beam from a light source to create a first light beam; a second light reflecting device configured for reflecting a transmitted light beam from the light beam from the light source to create a second light beam; an optical flat including a first surface and second surface facing away from the first surface, the optical flat disposed in a manner with the first surface facing the first light beam and the second light beam, the first surface configured to reflect and transmit the first light beam and the second light beam; and a mirror.

Abstract: A system for providing two spaced-apart parallel light beams wherein the space between the two spaced-apart parallel light beams is adjustable, the system including: a first beam splitter configured for reflecting a light beam from a light source to create a first light beam; a second beam splitter configured for reflecting a transmitted light beam from the light beam from the light source to create a second light beam; a third beam splitter configured for transmitting the first light beam and reflecting the first light beam to create a third light beam, the first beam splitter and the third beam splitter are disposed along a first central axis; a fourth beam splitter configured for transmitting the second light beam and reflecting the second light beam to create a fourth light beam.

Abstract: A method for detecting lens cleanliness of a lens disposed in a flat-field optical path, the flat-field optical path including a light source, the lens, a camera, the light source is a narrow-band multispectral uniform surface light source, the camera's light-sensitive surface is disposed perpendicular to an optical axis of the lens and in the light position of the lens, the method including collecting the bright-field image data and dark-field image data in a plurality of spectra through the lens; for each pixel, performing a spectral differential flat-field correction operation to yield a plurality of spectral differentials; and displaying the spectral differentials in the form of a plurality of images to show a uniformity of each of the plurality of images, wherein a non-uniform area on each of the plurality of images is determined to have been caused by an impurity of the lens.

Abstract: A method for detecting lens cleanliness of a lens in a flat-field optical path, the flat-field optical path includes a light source, the lens, a camera, the light source is a narrow-band multispectral uniform surface light source, the camera's light-sensitive surface is disposed perpendicular to an optical axis of the lens and in the light position of the lens and a pupil interposed between the lens and the light source, the method including collecting the bright-field image data and dark-field image data for a plurality of pupil aperture sizes through the lens; for each pixel, performing a pupil differential flat field correction to yield a plurality of PiPj pupil differentials; and displaying the pupil differentials in the form of a plurality of images to show uniformity of each image, wherein a non-uniform area on each image is determined to have been caused by an impurity of the lens.

Abstract: A method for detecting lens cleanliness of a lens in a flat-field optical path, the flat-field optical path includes a light source, the lens, a camera, the light source is a narrow-band multispectral uniform surface light source, the camera's light-sensitive surface is disposed perpendicular to an optical axis of the lens and in the light position of the lens, the method including disposing the camera such that the camera's light-sensitive surface is located a distance from the focal plane of the lens and measuring the bright-field image data and the dark-field image data; for each pixel, performing an out-of-focus differential flat field correction to yield a plurality of DiDj out-of-focus differentials; repeating the disposing and performing steps by altering the distance at least two more times; and displaying the out-of-focus differentials in the form of a plurality of images to show uniformity of each of the plurality of images.