35results about How to "Less interference from outside" patented technology

The invention discloses a tension-free cable laying spanning device, which comprises an elastic insulating rod, a cable guide rope and a series traction rope. The two ends of the elastic insulating rod are butted to form an elastic insulating ring. ring, and the series traction rope is fixedly connected with the elastic insulating ring. The invention also discloses a tension-free cable laying spanning device, which includes an insulating pulley, a cable guide rope and a series traction rope. The cable guide rope is slidably connected to the guide pulley of the insulation tackle. connecting rod connection. The invention uses elastic insulating rings or insulating pulleys to set an air channel under the existing high-voltage lines or bearing steel ropes, so that the construction cables can be guided to the destination conveniently and quickly, the construction difficulty is low, the time consumption is short, and the construction cost is greatly reduced , and the elastic insulating ring and the insulating pulley have a simple structure and are easy to maintain.

The invention relates to a distributed optical fiber deformation tensile instrument, and particularly relates to a deformation tensile device used for simulating practical applications of optical fibers at different tensile states. The distributed optical fiber deformation tensile instrument comprises a tensile system and an optical fiber bearing platform. The tensile system and the optical fiber bearing platform are connected. The defect that a conventional optical fiber deformation tensile test instrument cannot simply and accurately monitor the sensing performance of distributed optical fibers under multiple working conditions is overcome. The test device can simply and effectively control the loading progress, and can carry out crack opening development simulation, small strain monitoring and variable-angle variable-elevation multi-condition basic application research through a finally established movable smart tensile platform. The problems such as low optical fiber survival rate, long model making cycle, poor effect and high cost in some indoor simulation tests are avoided. The deformation mechanism and the combination mechanism of a distributed optical fiber monitoring technology under complex load conditions and at various operating state forms can be studied.

The invention discloses a laser annealing platform device which comprises a base, a furnace casing, a heating assembly, a heat insulation assembly, a tray and a plate unloading assembly. A furnace chamber is limited in the furnace casing, the upper surface of the furnace chamber is open, and the furnace casing is supported on the base; the heating assembly is arranged in the furnace chamber; the heat insulation assembly is arranged between the heating assembly and the inner wall of the furnace casing; the tray is arranged on the top surface of the furnace casing and is provided with a through hole which passes through the tray axially; the plate unloading assembly is arranged on the base and is positioned between the furnace casing and the base, and comprises a plurality of thimbles and a driving assembly, wherein the driving assembly is used for driving the plurality of thimbles to move along the upper and lower direction so that each thimble can pass through the corresponding through hole upward and extend upward to the upper surface of the tray. According to the laser annealing platform device provided by the invention, the structure is simple, and the heating for a silicon wafer is uniform; and when the silicon wafer is placed and unloaded, the plate unloading assembly plays a role of assistance, thus the silicon wafer is more convenient to place and unload.

The invention provides a single-phase ground fault line selection method, which comprises the following steps: separately acquiring transient zero-sequence currents of a half cycle after M lines is changed suddenly; acquiring a magnitude cross-correlation coefficient matrix G by a dynamic time bending distance algorithm; adopting plus or minus 1 to characterize the positive and negative polarity of the transient zero-sequence current, generating the transient zero-sequence current polarity coefficient matrix C of each line, and obtaining the polarity cross-correlation matrix H according to thepolarity coefficient matrix C of each line; combining the magnitude cross-correlation matrix G and the polarity cross-correlation matrix H to obtain a comprehensive cross-correlation matrix Q; usingthe comprehensive cross-correlation matrix Q as an input of a fuzzy C-means clustering, dividing the zero sequence current into two categories by the fuzzy C-means clustering, and selecting the faultline according to the category of each line. The invention also provides a single phase ground fault line selection device. The method and the device disclosed by the invention have less operation time, high accuracy and strong versatility.

The invention discloses a glass substrate air flotation device with deformation detection function. The device, the transport platform is provided with several uniformly arranged conveying air holes, the top of the conveying air holes is embedded with sintered metal porous material, and the bottom of the conveying air holes is connected with a gas transmission pipe, which is connected with a pressure reducing valve through a flow meter to reduce pressure. The valve is connected to the air source through a hose; at least two small holes are arranged around each conveying air hole of the transportation platform, the bottom of the small hole is connected to the pressure sensor through the air pipe, and the signal output end of the pressure sensor and the flow meter is converted with the input Module connection. The glass substrate air flotation device with deformation detection function of the present invention has the advantages of cleanliness, no pollution, no heat generation, no magnetism, etc., and the pneumatic system is easy to maintain and simple to construct.

The invention relates to a wavelength division multiplexing passive optical network multicasting system based on code superposition, belonging to the technical field of optical communication. The multicasting system comprises an optical line terminal, a feed-in line optical fiber, a remote-end code, a plurality of downstream distributing optical fibers and a plurality of optical network units, wherein the optical line terminal comprises a unicasting data signal generator and a multicasting data signal generator; and each of the optical network units comprises an optical powder divider, a unicasting data receiver and a multicasting data receiver. In the invention, the unicasting data is a signal encoded on the basis of a non-return-to zero code mode, the multicasting data is a signal encoded on the basis of a Manchester code mode, and the two signals are both signals based on an amplitude encoding mode, thus the system has very easy detection, less external interference and high stability, saves cost, and improves precision; and because the multicasting data adopts the Manchester code mode, the invention reduces power fluctuation in transmission, avoids the generation of long zero and long one, has good synchronization function and strong anti-interference capacity, and is very easy to recover clock signals at a receiving end.

The invention discloses an evaluating method for quality of grouting anchor lap joints of prefabricated concrete structural rebars. The evaluating method is characterized by comprising the following steps: sticking a piezoelectric patch to the middle part of the concrete surface in a grouting anchor lap joint area of the prefabricated concrete structural rebars; using a precise impedance analysismeter for applying a sweep frequency voltage signal to the piezoelectric patch; utilizing an electromechanical coupling effect of the piezoelectric patch and the structure to receive an electric admittance signal fed back by the piezoelectric patch; comparing with a standard conductivity signal curve; analyzing and testing a main peak frequency index and a root mean square RMSD index of the conductivity signal curve of the piezoelectric patch; and evaluating the quality of the grouting anchor lap joints of prefabricated concrete structural rebars in projects. The evaluating method has the advantages that the piezoelectric patch is integrated with a sensor and an exciter, the working frequency is high, the external disturbance is small, the grouting density in the grouting anchor lap jointarea can be accurately detected, no influence on the load-carrying capability of the grouting anchor lap joints is generated, the quick and efficient detection can be realized, the operation is simpleand the evaluating method is economical and practical.

The invention discloses a piezoelectric impedance effect based compactness defect monitoring method for a reinforcement sleeve grouting material. The method has the characteristics as follows: piezoelectric ceramic pieces are pre-embedded in the surface of a sleeve connected with tensioned reinforcement, the piezoelectric ceramic pieces are connected with a precision impedance analyzer through fine and soft wires, the precision impedance analyzer applies voltage signals to the piezoelectric ceramic pieces, and by means of electromechanical coupling effect of the piezoelectric ceramic pieces and the sleeve, electric admittance signals fed back by the piezoelectric ceramic pieces are received; if a defect exists, sleeve grouting is uncompact, compared with the electric admittance signals ofthe sleeve with compact grouting, the electric admittance signals of the piezoelectric ceramic pieces can change, and compactness of the sleeve grouting is quantitatively judged by adopting RMSD (root-mean-square deviation) as a defect index. The method has the advantages that a sensor and an actuator are integrated, working efficiency is high, outside interference is low, whether the sleeve grouting is compact can be monitored accurately, stress performance of sleeve connection is not affected, and rapid and effective monitoring can be realized.

The invention relates to a testing device and a testing method for semiconductor devices. The testing device comprises a testing platform and a probe station, the testing platform comprises a table plate, a circular piece fixed on the table plate, and a semiconductor device arranged on the circular piece, the semiconductor device comprises a testing chip and a non-testing chip, a probe in the probe station comprises a probe contacting with the front of the testing chip and a probe contacting with the silicon surface on the front of the non-testing chip and capable of applying high voltage, and the table plate is a grounded table plate. The testing method includes: fixing the circular piece on the table plate, and selecting the testing chip and the non-testing chip; grounding the table plate; enabling the testing probe to contact with the front of the testing chip, and grounding the testing chip; enabling the high-voltage probe to contact with the silicon surface of the front of the non-testing chip, and applying the high voltage to the testing chip through the high-voltage probe; and reading a voltage and current curve of the testing chip by the testing probe. The high voltage is directly applied on the front of the chip, so that interferences such as sparking are reduced, testing results are accurate, and safety is higher.

The invention discloses a white LED light source generation device of a transmission type visibility meter. The white LED light source generation device comprises an LED light-emitting device (1), an optical splitter (4), a beam shaping device (5) and a light intensity detector (7). The input end of the LED light-emitting device (1) is electrically connected with a controller (8) through a signal generator (2). The optical splitter (4) is arranged on an output light path of the LED light-emitting device (1). The light intensity detector (7) is arranged on the output light path of the optical splitter (4), and the output end of the light intensity detector (7) is electrically connected with the controller (8). Particularly, the LED light-emitting device (1) emits white light, and the output light color temperature is 3000 K. The optical splitter (4) is an optical fiber optical splitter, wherein a first downlink optical interface (41) is located at a focus point of the beam shaping device (5), and a second downlink optical interface (42) is in optical connection with the light intensity detector (7). The output light path of the beam shaping device (5) is provided with a concave mirror (51), with the focal distance being 1200 mm, of an iris diaphragm (6), and the control end of the iris diaphragm (6) is electrically connected with the output end of the controller (8). The white LED light source generation device can serve as an ideal light source of the high-measuring-accuracy transmission type visibility meter.

The invention relates to a two-degree-of-freedom measuring device and method based on plane mirror imaging. The measuring device includes a reference fixed plate and a fixed plate to be measured, and a reference plane mirror is fixed on the reference fixed plate and the fixed plate to be measured by fastening connectors respectively. and the plane mirror to be measured, the reference plane mirror is arranged opposite to the reflection surface of the plane mirror to be measured, a mirror frame on which a camera can be installed is arranged in front of the reflection surface of the reference plane mirror, a marking rod is arranged on the mirror frame, and the marking rod is parallel to the reference plane mirror, and the camera Connected to the computer through the data line, the invention applies the principle of multiple imaging of the plane mirror, and combines the optical principle with the mechanical structure. High performance, strong survivability, and simple structure, it solves the precise measurement of yaw angle and pitch angle between space planes, and has a guiding role in angle adjustment.