74results about How to "Not affected by electromagnetic interference" patented technology

The invention relates to a non-contact ground stress testing device and method based on drilling microscopy digital photography and belongs to ground stress measuring device and method of geotechnical engineering. The device comprises an electronic microscopy camera, a signal processing and control module, a signal transmission module, a gyroscope, a signal collecting module, a portable power source and a device shell. The method includes: fixing the testing device in a device mounting hole, using the electronic microscopy camera to collect the hole wall digital images of the hole during a whole stress relieving process, selecting the representative images before and after the stress relieving, acquiring sub-pixel images through image interpolation, optimizing sub-pixel image analyzing areas and points, setting analyzing traces, calculating to obtain strain values, and calculating the ground stress values and the azimuth angles thereof by the hole partial wall surface stress relieving method theory. The non-contact ground stress testing device and method has the advantages that simple operation and high adaptability are achieved, testing precision can reach one micro strain, strain measuring mark points and analyzing traces are optimized, influence of temperature, rock viscosity and electromagnetic interference is avoided, a probe can be reused, and low cost is achieved.

The invention discloses a navigation positioning method for a tour inspection robot of a transformer substation. The imaging positions of tracking navigation lamps in an infrared thermal imager are detected, so that the moving direction of a trolley is determined, and the aim of tracking is fulfilled; in order to position the robot in a moving process, a cradle head is horizontally rotated until an image of a positioning navigation lamp in the infrared thermal imager is in the center, the distance to the next fixed point is calculated according to the horizontal rotating angle of the cradle head and the moving distance of the trolley is calculated according to the sizes of images of the tracking navigation lamps in the infrared thermal imager, so that the aim of positioning is fulfilled.

The invention relates to the aviation pipeline oil leakage detection technical field, and provides an oil transfer pipeline oil leakage detection system based on fiber grating and a work method thereof; the detection system comprises a detection sensor, a multi-channel wavelength demodulator and a computer; the detection sensor comprises a substrate material, a sensitive material, and the fiber grating; the fiber penetrates the sensitive material and the substrate material; two rasters of different wavelengths are arranged between the sensitive material and the substrate material; the raster in the sensitive material is a detection raster; the raster in the substrate material is a reference raster; the reference raster and the detection raster are symmetrically arranged in the joint of anairplane conduit. The detection system can fully monitor the oil leak conditions of airplane fuel oil, lubricating oil and hydraulic oil system pipelines, thus providing timely and accurate information for daily maintenance and air dangerous case treatments, and ensuring flight safety.

The invention discloses an electronic gear detection mechanism based on photoelectric sensors. The electronic gear detection mechanism comprises an operation rod and a handle base, wherein the operation rod is formed by sequentially connecting an operation handle, a center ball and a telescopic pointed head, the center ball and the telescopic pointed head are arranged in the handle base, a plurality of light shielding baffle plates are uniformly arranged on the center ball in the circumferential direction of the operation rod, a photoelectric sensor group connected with an electronic gear control circuit is respectively arranged in the handle base corresponding to each light shielding baffle plate, and the photoelectric sensor group consists of at least two layers of photoelectric sensors. The electronic gear detection mechanism based on the photoelectric sensors has the advantages that the structure is simple, the manufacture is convenient, the mechanical vibration resistance performance and the electromagnetic interference performance are high, and the mistake triggering can be effectively avoided.

The invention provides a minimally-invasive-surgical-robot four-dimensional force sensor based on fiber gratings. The minimally-invasive-surgical-robot four-dimensional force sensor based on the fibergratings is mainly formed that nine fiber bragg gratings are bonded onto four narrow beams and four wide beams formed after being cut by eight axial cutting grooves on a hollow glass fiber round barrespectively, and the nine fiber bragg gratings are used for measuring the radial force Fx, the radial force Fy, the axial force Fz and the torque Mz of an end executor of the a hollow glass fiber round bar 2. In order to increase the sensitivity of force perception, the hollow glass fiber bar is subjected to hollow cutting; in order to reduce coupling between all forces, the roots of one ends ofthe four residual narrow beams after cutting are aslant cut to allow the four narrow beams to form cantilever beams, and coupling between multidimensional force is reduced. In addition, for the condition that the fiber gratings are easily influenced by the temperature, temperature compensation optical gratings are arranged on the outer wall of the hollow glass fiber round bar. The minimally-invasive-surgical-robot four-dimensional force sensor based on the fiber gratings is high in accuracy, is not influenced by electromagnetic interference, and is low in cost.

The invention relates to an extreme ultraviolet-ray space remote communication system. The extreme ultraviolet-ray space remote communication system comprises an extreme ultraviolet pulse generation modulator, an extreme ultraviolet collimator, an extreme ultraviolet focuser and an extreme ultraviolet detection demodulator; the extreme ultraviolet pulse generation modulator is arranged on the focal point of the extreme collimator and used for modulating a to-be-transmitted digital signal, and the signal is output in an extreme pulse signal form; the modulated extreme pulse signal is transmitted in an orientation manner after being collimated by the extreme ultraviolet collimator; the extreme ultraviolet focuser is used for receiving the extreme ultraviolet pulse signal and focusing the extreme ultraviolet pulse signal, and the extreme ultraviolet detection demodulator which is arranged on the focal point of the extreme ultraviolet focuser is used for demodulating the extreme ultraviolet pulse signal to obtain the to-be-transmitted digital signal.

The invention discloses a method for locating and detecting a deep high-density inclined ore body under in a full spatial domain based on tunnel gravity and belongs to the geophysical prospecting technical field. According to the method of the invention, the deep high-density inclined ore body can be located and predicted through using gravity anomalies and X, Y and Z-direction gravity gradient anomalies. The method mainly comprises tunnel gravity and gravity gradient observation and correction of observation data, wherein the correction of the observation data involves solid tide earth tide correction, zero drift correction, terrain correction, Bouguer correction, latitude correction, tunnel correction, goaf correction, backfill area correction and the like, so that gravity anomaly valuesand X, Y and Z-direction gravity gradient anomaly values can be obtained. With the method adopted, difficulties in locating a high-density inclined ore body in a full spatial domain and difficultiesin accurately locating and detecting of a deep high-density inclined ore body of other geophysical prospecting methods which are subjected to electromagnetic interference and have multiplicity of solutions for abnormalities can be eliminated.

The invention relates to a power utilization information acquisition device, which comprises a power distribution system and a master station system, wherein the power distribution system comprises a power distribution cabinet, and the power distribution cabinet comprises a cabinet body and a concentrator arranged in the cabinet body. The power utilization information acquisition device is characterized in that the concentrator and the master station system are connected in a switched manner by adopting a plastic optical fiber channel and a quartz optical fiber channel, the concentrator is provided with a collector which is connected in series through a first plastic optical fiber, the collector and the concentrator form a series closed loop through the first plastic optical fiber, and the collector is connected to an electric energy meter which is connected through a second plastic optical fiber. The power utilization information acquisition device has the advantages that the whole power utilization information acquisition device realizes data communication through the first plastic optical fiber and the second plastic optical fiber, the average meter reading time of each house can be shortened to less than one second, the overall meter reading period is short, the real-time performance is high, the overall communication rate is high, the reliability is high, the bit error rate is low, the power consumption is low, the device is not subjected to influences of electromagnetic interference and does not externally generate radiation, the operation and maintenance cost can be reduced by 95% compared with the existing operation and maintenance cost, and the work efficiency is improved.

The invention discloses a signal generation and comparison device and method based on optical fiber transmission. The signal generation and comparison device comprises a ground operation control system and an information processing subsystem, a signal transceiving subsystem and a 10-gigabit switch of a civil service platform. The ground operation control system and the information processing subsystem of the civil service platform organize service information needing to be sent out of a station to generate baseband signals and send the baseband signals to the signal transceiving subsystem. Thesignal transceiving subsystem of the civil service platform is responsible for generation of information frames and signal spread spectrum modulation, signals are transmitted to a ground operation control system through optical fibers, meanwhile, time delay information is obtained by comparing the signals transmitted back through the optical fibers with outbound signals, and relevant parameters of signal transmission are adjusted. According to the invention, the signal interaction architecture and the optical fiber transmission signals are compared to realize the signal combination transmission of the main control station and the civil station, so that the security of the service information of the main control station is enhanced, the time delay stability of the system is improved, and the maintenance difficulty and cost are reduced.

The invention discloses a heat dissipation and electromagnetic interference prevention device for network equipment, which comprises a shell, a plurality of placement bins are arranged in the shell, a heat dissipation plate is arranged on one side of the shell, a plurality of first heat dissipation holes are formed in the heat dissipation plate, and sliding grooves are formed between the heat dissipation plate and the placement bins; an elastic piece is arranged at one end in the sliding groove, an air bag is arranged at the other end in the sliding groove, a sliding block is arranged between the elastic piece and the air bag, a plurality of second heat dissipation holes are formed in the sliding block, and the second heat dissipation holes are communicated with or staggered with the first heat dissipation holes along with sliding of the sliding block. The device not only meets the conventional working requirements of the network equipment, but also can divide each working area, realize fixed-point efficient cooling and ensure the heat dissipation efficiency and heat dissipation effect of the device, and meanwhile, the device also can judge whether the device is influenced by electromagnetic interference or not according to the displacement difference detected by each displacement sensor, so that the working efficiency of the device is improved. Therefore, electromagnetic interference can be prevented, and the efficient heat dissipation performance of the device can be continuously realized. The invention is applied to the technical field of network equipment.

The present invention provides a road-use optical fiber grating interlayer relative horizontal displacement sensor. According to the technical scheme of the invention, the test on the relative horizontal displacement between layers inside a pavement structure is realized. A top cover is embedded into the bottom of an upper-layer structure. A center column is connected with a top cover and a uniform strength beam, so that the top cover and the uniform strength beam move together. A bottom plate is embedded into the top of a lower-layer structure, and monitors the mutual displacement condition of the above two layers. A fixed ring is used for fixing the top cover and the bottom plate. Under the fixation of the fixed ring, only a tangential displacement is generated between the top cover and the bottom plate, so that the top cover and the bottom plate are not mutually separated. A silica gel pad is placed between the fixed ring and the bottom plate to limit the rotation of the bottom plate and the top cover, so that the top cover and the bottom plate are rebounded after the displacement. A fixed plate is used for fixing the silica gel pad of and other structures, so that the silica gel pad of and other structures are located inside the bottom plate. The uniform strength beam converts the horizontal sliding generated by the sensor into the vertical displacement. A sliding groove is arranged in the bottom plate and a glass cover plate is covered onto the sliding groove to increase the scratch resistance thereof. An optical fiber grating is stuck onto the uniform strength beam by a special structural adhesive, and the deformation of the uniform strength beam is converted into the wavelength change of the optical fiber grating.

The invention discloses a self-powered multi-dimensional detection and interactive control device and method. The device comprises an X axis (2), a Y axis (3), a rocker (1) and angle sensors (4); therocker (1) penetrates through the X axis (2) and is fixed on the Y axis (3) by using a bolt; two angle sensors (4) are respectively installed at the top ends of the axis (2) and the Y axis (3); and when the rocker (1) rotates, the rocker can drive gears in the angle sensors to rotate around the X axis and the Y axis. Each of the angle sensors (4) comprises a mounting support (11), a hinge (12), afriction plate (13) and a gear (17); one end of the friction plate (13) extends into the two teeth of the gear, and the other end of the friction plate (13) is adhered to the hinge (12) through an adhesive tape; and the hinge (12) is connected with the mounting support (11) through a rotating shaft. According to the self-powered multi-dimensional detection and interactive control device provided by the invention, no extra power supply module is needed, and the influence of electromagnetic interferences caused by a direct current power supply is avoided.

The present invention relates to a maximum principal stress sensor of road fiber grating. The test of the maximum principal stress in the pavement structure can be realized. The sensor comprises spherical housing; a liquid chamber arranged in the spherical housing and consisting of a cavity body and internal fillers; elastic membranes which are fixed at two sides of the liquid chamber through fixed rings and have a force fiber grating arranged at the middle; and a compensation fiber grating arranged at the other side of the elastic membranes and configured to compensate the measurement error caused by the surrounding environment temperature of the sensor. Compared to a traditional sensor, the stress sensor provided by the invention can measure the pavement structure maximum principal stress, has the measurement result which cannot be influenced by the stress direction, is provided with temperature compensation, is easy in laying networking and wide in application range and can realize the remote distance monitoring, etc.

The invention relates to a crimping type power semiconductor structure and an internal pressure online measurement method thereof, and belongs to the field of power semiconductor devices. The structure comprises a shell and a plurality of parallel subunits; and each subunit comprises a top plate, a flexible assembly, a silver sheet, a molybdenum sheet, a chip and a substrate, wherein the flexible assembly comprises a disc spring group and a conductive copper sheet, and a thin copper sheet is arranged in the middle of the conductive copper sheet, a groove is formed in the side surface of the thin copper sheet, an optical fiber strain gauge and an optical fiber thermometer are installed in the groove, and the optical fiber thermometer is used for temperature compensation of the optical fiber strain gauge. According to the crimping type power semiconductor structure and the internal pressure online measurement method thereof of the invention, real-time measurement of the internal pressure of the crimping type power semiconductor module is realized, and the measurement sensitivity is high.