National Taiwan University

3Dfamily Technology Co., Ltd.

National Taipei University of Technology

Kuang-Chao Fan

Chih-Chin Hsu

Yao-Joe Yang

Tien-Tung Chung

Liang-Chia Chen

Shou-Heng Chen

Wu-Lang Lin

The invention discloses a method for roundness measurement, which includes the steps of, mounting and rotating an object on a rotary table; driving two measuring surfaces of two measurement units to respectively abut against two opposite sides of the object, wherein the two measurement units are disposed on two opposite sides of the rotary table and the two measuring surfaces are parallel to each other and perpendicular to a to surface of the rotary table; during rotation of the rotary table, measuring intermittently a shortest straight line distance between the two measuring surfaces and generating a variation data and after the rotary table completes a full-circle rotation, a processing unit receiving the variation data and generating measured data. The present invention also discloses a device for roundness measurement.

Device and method for roundness measurement

A real-time wavelength correction system for visible light is co-operated with an optical system to make a parallel light beam split into a zero-order diffractive parallel light beam and a first-order diffractive parallel light beam. The zero-order diffractive parallel light beam focuses on a first back focal plane to form a first light spot. A drift of the first light spot is applied to determine an angular drift of the parallel light beam. The first-order diffractive parallel light beam is focused on a second back focal plane to form a second light spot. A drift of the second light spot is applied to determine an angular drift of the first-order diffractive parallel light beam. The angular drifts of the parallel light beam and the first-order diffractive parallel light beam, which are changed with real time temperature variation, are applied to correct the wavelength of the parallel light beam.

Real-time wavelength correction system for visible light

A simple type dual axes optoelectronic level includes a carrier, an adjustable fixing mechanism, a level sensing device, a container cup holding a liquid, and a reflector. The adjustable fixing mechanism and the container cup are fixed at the carrier. The level sensing device is fixed at the adjustable fixing mechanism and faces the container cup. The reflector is fixed at the bottom surface of the container cup. The level sensing device provides a measuring light beam, which is refracted by the liquid surface to the reflector, and reflected back to the liquid surface by the reflector, and refracted again by the liquid surface to the level sensing device. Through the refraction effect, the level sensing device can detect two angles between the bottom surface of the carrier and the liquid surface. The dual axes optoelectronic level has advantages of simple structure, low cost and differentiating angles of two axes.

Simple type dual axes optoelectronic level

This invention relates to an optical switch with an arbitrary port number and its arrangement method for the optical communication system, and switches an optical path by using mirrors. The invention uses a network exchange algorithm to compute crossing points and reflecting points of the optical paths. Single-sided reflecting mirrors are disposed at the reflecting points of the optical path respectively, and double-sided reflecting mirrors are disposed at the crossing points of the optical path respectively. With the arrangement method, the arbitrary port number optical switch can be applied to satisfy the requirement for an arbitrary number of input and output terminals, so as to assure that an equal length of each optical path and to decrease the number of mirrors to minimize the cost, size and assembling time of the optical switch.

Multi-port optical switch and method of arranging the same

A 2&#xd7;2 mechanical optical switch includes a base, four collimators (two input collimators and two output collimators), an ultra thin mirror (double-sided reflection) and a switching mechanism of the mirror. This switch utilizes four collimators, which are arranged 90&#xb0; with each other on a common plane, to emit and receive parallel light beams at a certain distance. The light beams are reflected by an ultra thin mirror. When the mirror is moved away from the intersection point of two optical paths, the input lights will directly enter into output channels (transmission state). While the mirror is moved to the intersection point which is the reflection position, the optical beams will be bent into alternate output channels (reflection state) simultaneously from both sides of the ultra thin mirror.

2&#xd7;2 Mechanical optical switch

A miniature three-dimensional contour scanner is provided, which integrates the optical element and the set of optical lens of the optical projection module and the image capture module into a miniature measurement device. The device utilizes the optical fiber to guide in the light of outside light source and applies the digital micromirror device (DMD) chip to produce structured light pattern and project it onto the object's surface to be measured. The image sensor element is then used to capture the deformed structured fringe image, and by utilizing this information it is able to obtain the colored two-dimensional image and the three-dimensional contour size of the object. The miniature three-dimensional contour scanner can thus be applied in the measurement of miniature objects in the narrow space.

Growing community of inventors

Taipei, Taiwan

Kuang-Chao Fan