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

The invention relates to a test apparatus and test method of the stiffness of a glass fiber mat and cloth. The test apparatus comprises a pedestal, a support, an up-and-down movement platform, a sample stage and a slide rail. The test method comprises the following steps: 1, cutting the glass fiber mat and cloth to be tested according to a prescribed dimension to form a sample to be tested, and carrying out standardized pretreatment on the sample to be tested; 2, tiling the pretreated sample to be tested on the sample stage, pushing the sample to be tested to forward move for a certain distance, and upward moving the up-and-down movement platform to make the upper surface of a horizontal scale just touch the falling edge of the sample to be tested; and 3, measuring the horizontal distance of the sample to be tested through the horizontal scale, measuring the falling distance of the sample to be tested through a height scale, and calculating the stiffness coefficient of the glass fiber mat and cloth sample to be tested, which is a ratio of the horizontal distance of the sample to be tested to the falling distance of the sample to be tested. The test method has the advantages of simple and effective process, scientific test principle and high test precision, and the test apparatus has the advantages of simplicity, durability, accurate test effect, convenience, and high practicality.

The invention discloses a glass substrate air flotation device with a deformation detection function. The glass substrate air flotation device comprises a transporting platform, a fixed platform and a base. The fixed platform is connected with the base through supporting columns. Driving devices used for driving a glass substrate to move are arranged on the two sides of the transporting platform. The transporting platform is provided with a plurality of conveying air holes arranged evenly. A sintered metal porous material is embedded in the top end of each conveying air hole. The bottom of each conveying air hole is connected with an air conveying pipe. The air conveying pipes are connected with a pressure reduction valve through a flowmeter. The pressure reduction valve is connected with an air source through a hose. At least two small holes are formed in the periphery of each conveying air hole of the transporting platform, the bottom of each small hole is connected with a pressure sensor through an air pipe, and the pressure sensors and the signal output end of the flowmeter are connected with an input conversion module. The glass substrate air flotation device with the deformation detection function has the advantages of being clean, free of pollution, heating and magnetism generation and the like, and a pneumatic system is easy to maintain and simple in structure.

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 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 belongs to the technical field of sensor design, and relates to a novel piezoelectric passive acceleration sensor. The piezoelectric passive acceleration sensor comprises an end cover (1), mass blocks (2), piezoelectric plates (3), insulating sheets (4), a base (5), a shell (6), wires (7), a circuit board (8) and an aviation plug (9). When a sensor feels vibration, the mass blocks (2) can move relative to the base (5), the piezoelectric plates (3) are sheared to generate charges, the charge quantity is proportional to the vibration acceleration, the charge quantity is processed through the circuit board (8) and acceleration signals are outputted through the aviation plug (9). The acceleration sensor adopts a piezoelectric material as a conversion element, the dynamic range islarge, the frequency range is wide, the sensitivity error is small, the external disturbance is small, and no external power supply is needed. By adopting a shearing-type sensor structure, force measurement errors generated by deformation under sensor shell temperature or stress can be reduced.

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 throughhole 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 adriving 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 belongs to the technical field of determination of petroleum in a soil sample, and discloses a method for determining petroleum in a reclaimed land sample by accelerated solvent extraction-fluorescence spectrophotometry. The method comprises the following steps: petroleum components in a soil sample are extracted, concentrated and purified by an accelerated solvent extractor to obtain a to-be-determined extracting solution; and the to-be-determined extracting solution is excited at fixed excitation wavelength and the fluorescence intensity is determined, and the concentration ofpetroleum in the soil sample is calculated by using a standard working curve. According to the method, the accelerated solvent extractor is adopted for extracting the soil sample, petroleum componentsin the sample are extracted, the solvent consumption is small, the extraction efficiency is high, and the instrument is automatic. The determination based on fluorescence spectrophotometry is accurate, simple and convenient. The analysis and test efficiency is greatly improved while the accuracy and reliability of the test result are ensured.

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 discloses a portable DC test discharge rod, relates to a discharge device used in an electric property testing process and is used for solving a problem of susceptibility of length change of a prior electricity testing rod due to external interference. The portable DC test discharge rod includes a telescopic insulation body comprising a bottom sleeve, a middle sleeve and an upper sleeve. A spiral screw rod having a length equal to that of the bottom sleeve is arranged in the bottom sleeve. A hollow connection rod having a length equal to that of the middle sleeve is arranged in the middle sleeve. A hollow screw rod having a length equal to that of the upper sleeve is arranged in the upper sleeve. The spiral screw rod is provided with male threads. The hollow screw rod is provided with female threads. The inner surface and the outer surface of the hollow connection rod are both provided with threads. The threads on the inner surface of the hollow connection rod cooperate with the male threads of the spiral screw rods. The male threads of the hollow connection rod cooperate with the female threads of the hollow screw rod. The portable DC test discharge rod is applied toDC voltage withstanding tests and releases electric charges accumulated on a test sample.

The invention discloses a tension-free cable-laying crossing device which comprises an elastic insulating rod, a cable guide rope and a serial hauling rope, wherein two ends of the elastic insulating rod are abutted joint to form an elastic insulating ring, the cable guide rope penetrates through the elastic insulating ring, and the serial hauling rope and the elastic insulating ring are fixedly connected. The invention further discloses the tension-free cable-laying crossing device which comprises an insulating tackle, a cable guide rope and a serial hauling rope, wherein the cable guide rope is connected on a guide pulley of the insulating tackle, and the serial hauling rope is connected with an insulating connecting rod of the insulating tackle. The elastic insulating ring or the insulating tackle is adopted, an air passage is arranged below an existing high-pressure line or a bearing steel rope, so that construction cables are convenient and rapid to guide to a destination, construction difficulties are low, time consumption is short, construction cost is reduced greatly, meanwhile, the elastic insulating ring and the insulating tackle are simple in structure and easy to maintain.

The invention relates to a two-degree freedom measurement apparatus and method based on plane mirror imaging. The measurement apparatus comprises a reference fixed plate and a to-be-measured fixed plate; a reference plane mirror and a to-be-measured plane mirror are fixed on the reference fixed plate and the to-be-measured fixed plate respectively by fastening connecting elements; and reflection surfaces of the reference plane mirror and the to-be-measured plane mirror are opposite to each other. A mirror rack for installing a camera is arranged in front of the reflection surface of the reference plane mirror; a marking rod is arranged on the mirror rack and is parallel to the reference plane mirror; and the camera is connected with a computer by a data line. According to the invention, on the basis of a multi-times imaging principle of a plane mirror, an optical principle and a mechanical structure are combined; the optical path propagation is not affected by severe factors like the electromagnetism, temperature, humidity, and dust and the like; the external interference is low; the reliability and the viability are high. Moreover, the structure is simple; precise measurement of a yawing angle and a pitching angle between spatial planes is realized; and the apparatus and method play a role in guiding angle adjustment.

The invention discloses a method for distinguishing the optical axis of a camera in real time, relates to a method for distinguishing relative poses of objects in machine vision in real time, and belongs to the field of machine vision. The method comprises steps as follows: Step one, LED flickers are mounted on a game display screen, a high-speed camera for acquiring images of the LED flickers mounted on the screen in real time is arranged in a virtual gun, and backlight removal treatment is performed on the acquired images of the LED flickers mounted on the screen; Step two, the mapping relation between acquired LED flicker positions and actual positions of the LED flickers on the game display screen is established according to parity of point numbers of the LED flickers, acquired by the virtual gun in real time, on the game screen and the LED flickers, and the relative poses of the objects in machine vision are distinguished in real time. According to the method, the position of the optical axis of the camera in machine vision is distinguished through LEDs arranged on the game display screen and calculation of the virtual gun mapping position relation, and the method is high in distinguishing speed and high in result precision and is slightly interfered by the outside.

The invention provides a railway digital train tail loop antenna and a manufacturing method thereof. The loop antenna comprises a housing, a coil assembly arranged in the housing and a tuning matchingdevice. A silk-covered wire in the coil assembly is wound around the loop outer surface of a loop inner fixation frame to form an inner coil, and is led to and wound around the loop outer surface ofa loop outer fixation frame to form an outer coil. The loop inner fixation frame and the loop outer fixation frame are stacked together and are glued together by a plurality of electrical adhesive tapes to make the inner coil and the outer coil become one body. A start wire of the inner coil of the silk-covered wire is connected with a radio frequency positive end of the tuning matching device; anend wire of the outer coil of the silk-covered wire is connected with a capacitor array in the tuning matching device; and the capacitor array is connected to a radio frequency negative end. Throughdouble-layer multi-strand winding of the silk-covered wire and superposition of inner and outer coils, and through paint dipping processing during manufacturing, the size and volume of the antenna canbe greatly reduced.

The invention discloses a textile tensioner based on an adjusting device, which comprises a main body, an automatic adjusting device is arranged on the main body, and the automatic adjusting device comprises a cavity, an electromagnetic coil, an iron core, a spring and a chassis; the cavity is provided with a cavity for accommodating the iron core; the iron core is arranged in the cavity, and the lower end of the iron core extends out of the cavity from the opening; the part, extending out of the cavity, of the iron core is provided with a through hole allowing yarn to penetrate through. The electromagnetic coil is wound on the outer side wall of the cavity; the spring is sleeved outside the iron core; the chassis is positioned right below the iron core and is fixed on the main body; the base plate is a magnet plate. An automatic adjusting mode is adopted, the yarn tension can be rapidly adjusted, the yarn tension is prevented from being too large or too small, and then the yarn breaking or winding problem is prevented; manual adjustment is adopted, external interference is small, an operator can freely adjust the yarn tension adjusting device according to actual production and processing conditions, controllability is large, it is helpful to guarantee stability of yarn tension, and production and processing efficiency and quality are improved.