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4947 results about "Contact type" patented technology

In mathematics, more precisely in symplectic geometry, a hypersurface of a symplectic manifold is said to be of contact type if there is 1-form such that and is a contact manifold, where is the natural inclusion. The terminology was first coined by Alan Weinstein.

Temperature measurement and calibration platform in space vacuum environment

ActiveCN102539019ASolve the problem of large differences in measurement resultsSolve the traceability problemThermometer testing/calibrationVacuum pumpingSpace environment
The invention relates to a temperature measurement and calibration platform in space vacuum environment. The temperature measurement and calibration platform is favorable for realizing the simultaneous calibration of contact type temperature measurement and non-contact type temperature measurement, so the temperature measurement and calibration platform is served for heat vacuum and heat balance experiments of spacecrafts such as satellites, spaceship and the like. The temperature measurement and calibration platform comprises a constant temperature bath, wherein a double-sub-cavity vacuum cavity, the double-sub-cavity vacuum cavity comprises a first vacuum cavity body and a second vacuum cavity body, the first vacuum cavity body and the second vacuum cavity body are connected with a vacuum pumping device through a three-way valve, standard temperature indicator sensors are respectively arranged on the outer wall of the first vacuum cavity body and on the outer wall of the second vacuum cavity body, the standard temperature indicator sensors are connected with a temperature secondary meter, a laser light path reflecting device is arranged in the vacuum cavity of the first vacuum cavity body for calibrating a non-contact type temperature measuring system based on the tunable diode laser absorption spectrum technology, and the vacuum cavity of the second vacuum cavity body is used for accommodating a temperature sensor for calibrating a contact type temperature measuring system adopting the temperature sensor.
Owner:BEIJING DONGFANG MEASUREMENT & TEST INST

Expanded beam fiber optic connection system

ActiveUS20100027943A1Low costNumber of component requiredHeating or cooling apparatusLaboratory glasswaresFiberEngineering
An expanded beam fiber optic connection system is disclosed which overcomes the problems associated with known expanded beam fiber optic connection systems. In particular, the expanded beam fiber optic connection system in accordance with the present invention includes a pair of mating fiber optic connectors. Each fiber optic connector includes a connector body and fiber optic termini. In accordance with an important aspect of the invention, the fiber optic termini utilize expanded beam technology and are configured with virtually the same form factor as existing physical contact fiber optic termini. The configuration of the expanded beam termini provides several benefits. First, existing physical contact fiber optic connection systems can be updated in the field by simply replacing the existing physical contact fiber optic termini with the new expanded beam fiber optic termini in accordance with the present invention and re-using the existing connector body, thus significantly reducing cost of upgrading existing physical contact type fiber optic connection systems. Secondly, since the same connector bodies are used for both the physical contact termini and the expanded beam termini, the number of components for the two types of fiber optic connection systems is reduced, thus reducing manufacturing costs.
Owner:GLENAIR

Method and device for online detection of size of city rail train wheel set

The invention discloses a method and device for online detection of the size of a city rail train wheel set. A system is mainly comprises two 2D laser displacement sensors arranged along a train rail in a mirror symmetric mode, and two laser bijection switches arranged on the two sides of the same rail in a certain geometrical relation. The 2D laser displacement sensors detect and obtain tread contour lines, and the two laser bijection switches detect the wheel passing speed. The rim height and the rim thickness are worked out by extracting the tread contour lines of wheels passing through a detection system according to the geometrical relation. The coordinates of the lowest rim points of the detected tread contour lines of the wheels at different moments are extracted, the coordinates at the different moments are restored to coordinate values at the same moment on the condition that the speed is given, so that the circle where the top points of the rims of the wheels are located is fitted out, the two times of the height of the rims is subtracted from the diameter of the circle of the top points of the rims, and thus the diameters of the wheels are obtained. The method and device for online detection of the size of the city rail train wheel set are low in cost, simple in operation and high in non-contact type measurement precision.
Owner:NANJING UNIV OF SCI & TECH +1

Spatial circular geometric parameter binocular stereo vision measurement method

The invention discloses a spatial circle geometrical parameter dual-eye solid visual measurement method suitable for non-contact type online measurement of the spatial circle geometrical parameter of an industrial product, aiming at overcoming the existing problems of low measurement precision, slow measurement speed and low automation degree. The method is divided into a calibrating stage, an image processing stage and a spatial circle fitting stage. A neural network technique is firstly adopted to carry out the calibration of a camera; a dual-camera is utilized to carry out the extraction of sub-pixel image edges of the spatial circle, a simple algorithm is developed based on the image gray gradient distribution characteristic so as to realize the match of edge points, the practical 3D spatial coordinates of the circle edges are then obtained, and the geometrical parameters of the spatial circle comprise radius, position of center of circle and orientation of the plane where the spatial circle is arranged are gained by the fitting of the spatial circle with corresponding mathematical geometrical knowledge. The spatial circle geometrical parameter dual-eye solid visual measurement method has fast image processing speed and high automation degree, and has relative measurement error of the spatial circle of superior to plus or minus 0.6% when the plane where the spatial circle is arranged has an angle of about 50 DEG with the image plane.
Owner:JILIN UNIV

Non-contact type apparatus for transmitting electric energy

The invention relates to a non-contact electrical energy transmission device, particularly a non-contact charging device between an electrical energy emission device and an electrical energy receiving device, so as to realize the information exchange between the electrical energy emission device and the electrical energy reception device. The technical proposal is as follows: the electrical energy emission device and the electrical energy receiving device carry out the electrical energy transmission through coupling two air core coils. Additionally, the device utilizes the RFID technique to realize the information exchange between the electrical energy emission device and the electrical energy receiving device. On one hand, the electrical energy emission device performs the identification of the electrical energy receiving device, that is, the ID identification; on the other hand, the information exchange of the charging state between the electrical energy emission device and the electrical energy reception device is realized, thereby realizing the real-time monitoring of the charging process. Therefore, the non-contact electrical energy transmission device ensures the safe and controllable electrical energy transmission.
Owner:BEIJING BEIYOU INFORMATION TECH DEVCO
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