A bending applying device includes three mandrels and applies bending to an optical fiber by winding the optical fiber onto the mandrels. The mandrels are alternately arranged at predetermined intervals such that outer circumferences of adjacent mandrels in a longitudinal direction of the optical fiber face each other in a non-contact manner. A diameter of the optical fiber is D, a radius of the mandrel is r, an interval between the adjacent mandrels in the first direction is 2r + d, a direction orthogonal to the first direction is a second direction, an interval between the adjacent mandrels in the second direction is s, and an angle θ between the second direction and a common internal tangent of the adjacent mandrels is 0 degrees or more and 45 degrees or less, and the formed angle θ satisfies following formula.

[00001]$\sqrt{\left(d+D+4r\right)\left(d-D\right)+s^2}=2\left(r+\frac{D}{2}\right)\tan \theta +\frac{s}{\cos \theta }$

The present disclosure relates to a support device for a flexible plate structure, which belongs to field of regulation. The support device includes a base, a support rod, a plurality of contact rods, and a regulation structure. The support rod is disposed on the base. The plurality of contact rods are parallel to the support rod and arranged in an arc around the support rod, wherein side faces of the plurality of the contact rods provide a support surface for supporting the flexible plate structure. The regulation structure is connected to the support rod and the contact rod, wherein the regulation structure is configured to regulate a distance between the contact rod and the support rod to regulate a bending curvature of the support surface. The distance between the contact rod and the support rod is regulated by the regulation structure, and the bending curvature of the support surface is regulated, such that the bending curvature of the flexible plate structure is regulated. In the process of detecting the performance of the flexible plate structure, a support device may support the flexible plate structure under different bending curvatures, and thus a cost is reduced. In the detection process, it is not necessary to replace the support device, which improve the work efficiency.

The present invention provides an apparatus and method for optical centering of lenses, potentially to be used for automatic accurate alignment and bonding of said lenses into an imaging system. The non-rotating lens centering device includes a motorized focusing autocollimator, one or two aiming lasers coupled to the motorized focusing autocollimator, and an optical laser redirector such as retro-reflectors or beam splitters and mirrors. The system may comprise an imaging device for alignment and beam profiling, a computer device and algorithms for data analysis to provide information related to centering offsets to be corrected. Motorized correcting system will realign and eliminate the unwanted decentering and adjustment of the lens.

The present disclosure provides a distance determination method, apparatus and system, relating to the technical field of image processing. The method includes the following steps: acquiring a master visual image photographed by a master camera and an original auxiliary visual image photographed by an auxiliary camera; acquiring an initial matching point pair between the master visual image and the original auxiliary visual image through feature extraction and feature matching; correcting the original auxiliary visual image sequentially, based on the initial matching point pair and different constraints, so as to obtain a target auxiliary visual image, wherein the different constraints includes: a constraint of a minimum rotation angle and a constraint of a minimum parallax; and determining a focusing distance according to the master visual image and the target auxiliary visual image. The focusing distance can be determined more accurately.

Disclosed herein is a method for testing a field of view. The method includes arranging an image acquisition apparatus at a predetermined observation position of an image output device, and arranging a grid line apparatus at a predetermined distance in front of the image acquisition apparatus. The method further includes controlling the image output device to output a test pattern; moving the grid line apparatus, and keeping the distance between the grid line apparatus and the image acquisition apparatus unchanged, such that a centerline of the grid pattern coincides with a centerline of the test pattern. Additionally, included in the method is capturing an image of the grid pattern and the test pattern by the image acquisition apparatus; and determining a field of view of the image output device according to a relationship between the test pattern and the grid pattern in the captured image.

A visual inspection device and apparatus is disclosed for inspecting fiber ends of a connector by capturing an image of the connector end face, and implementing an image analysis tool for detecting contamination from the captured image. The visual inspection tool includes components for providing a larger field of view to capture the entire connector end face in a single image, and the image analysis tool is able to accurately and efficiently detect contamination from the captured image.

A method of synthesizing an effective refractive index metamaterial, the method may include the steps of: a) analysing an effective index material by directing an electromagnetic plane-wave towards a surface of the metamaterial and calculating the polarization currents distribution field in the metamaterial, wherein the effective refractive index metamaterial is comprised of a plurality of layers of at least a first material having a first refractive index and at least a second material having a second refractive index; b) filtering and sampling the polarization currents distribution field according to the layers, wherein the layers comprise pre-determined parameters requirements, the parameters including at least one of: refractive indexes of the first material and the second material, effective refractive index of the layer and thickness of the layer; and c) determining a layer arrangement and thickness for the first and second materials comprising the plurality of layers.

Disclosed are a method and system for testing a wearable device. The method includes: performing an angle acquisition process for at least two times, and calculating an optical imaging parameter value of a target virtual image on the basis of angle variation values acquired in the at least two angle acquisition processes. With the method and system according to the present disclosure, the finally calculated optical imaging parameter value is more objective and more accurate than that acquired by means of the human eyes.

The present disclosure is directed to enabling detection of microbending even in a case where a microbending loss varies.

The present disclosure relates to a device that measures a transmission loss in a measured optical fiber to be targeted, and detects microbending in the measured optical fiber based on periodicity of the transmission loss.

The present disclosure is directed to enabling detection of microbending even in a case where a microbending loss varies.

The present disclosure relates to a device that measures a transmission loss in a measured optical fiber to be targeted, and detects microbending in the measured optical fiber based on periodicity of the transmission loss.