35 results about "Point reflection" patented technology

A plane cable fault locator based on time domain reflection includes a high speed pulse generating and transmitting circuit, a high speed pulse acquisition and treatment circuit, an impedance matching circuit, a signal storing and treating system, a communication interface, a power supply system, an information display system, an external connection computer system and an information input system. The plane cable fault locator based on time domain reflection adopts a low pressure high speed pulse reflection method to diagnose the types of plane cable short circuit and open circuit and other faults through observing fault point reflection pulse waveform according to a time domain reflection principle, and subsequently calibrates the position of a fault point by measuring the time difference of transmitted pulse and the reflected pulse of the fault point. As the rising edge time of the pulse transmitted by the locator is short and reaches nanosecond level, the locating precision is high. In addition, the locator can accurately calibrate the plane cable fault position so as to avoid taking a plurality of clamping plates apart when looking for faults in plane cable maintenance, thus improving the maintenance efficiency of planes and ensuring the flying safety of planes.

The invention provides a pre-stack seismic data frequency band expanding method of combining well information and horizon information. The pre-stack seismic data frequency band expanding method comprises steps that signal-to-noise ratio spectrum analysis, spectral analysis, and band division scanning of seismic data are carried out to determine a dominant frequency band and to-be-compensated frequency bands; correction and well-seismic matching of well logging data are carried out to construct a well-side expected seismic record; by using a well point reflection coefficient, a well-side seismic record, and a horizon interpretation data, a sparse reflection coefficient section is constructed, and then expected seismic records of non-well points are acquired; by adopting an original seismic record and a reversed wavelet convolution, the expected seismic record is approached, and a corresponding bilateral reversed wavelet is acquired; a frequency-expanding operator acquired by a stacked record is used for a CRP trace gather, and the frequency-expanding operator is used to process every data of the CRP trace gather to acquire the high frequency frequency-expanding record and the low frequency frequency-expanding record of the CRP trace gather; the data reconstruction of the low frequency data acquired by the frequency expansion, the original dominant frequency band, and the high frequency data acquired by the frequency expansion is carried out to acquire wide frequency band seismic data.

The invention discloses a visual position-pose measurement method based on point-line combination characteristics, which belongs to the technical field of computer vision measurement and relates to a method applicable to measurement on the position and pose of a split-type cylinder-like object moving at high speed. The surface point-line combination characteristics of the cylinder-like object moving at high speed are acquired by a binocular visual system; a target axis and a local coordinate system can be obtained through five steps of calibrating by a high-speed camera, segmenting a point-line characteristic image, extracting characteristic marks, matching the characteristic marks, and acquiring the position and the pose, and then target position-pose information is acquired according to the target axis and the local coordinate system; the point-line combination characteristics consists of circle reflection marks with two axes respectively formed at the front segment and the rear segment of a target object coinciding with target axes, and four point reflection marks which are uniformly distributed at the circumference of the middle segment of the target object and are restrained from different distances to the circle at the front end. The problems that the axis of the cylinder-like object is not easy to acquire, the precision of the acquired axis is low, and the surface mark can not be precisely positioned due to the repeated assembly of the split-type object are solved by utilizing straight-line characteristics of strong anti-noise capacity and large information amount which are matched with point characteristics.

The invention discloses a high-tension transmission line single-ended traveling wave fault distance detection method combined with time-frequency characteristics. According to the method, time of reciprocating propagation between an end point and a fault point and inherent frequency corresponding to the time are fully used, wherein the end point and the fault point are simultaneously obtained in a cepstrum analysis. The advantages of a traveling wave method and the advantages of a traveling wave inherent-frequency distance detection method are centralized, and therefore the problems that in single-ended traveling wave fault location, wave velocity is difficult to calculate, propagation time of a small phase angle is difficult to seek, due to the fact that only the traveling wave inherent-frequency distance method is used, the frequency is not easy to extract, and in the calculation, an initial phase angle of a bus end reflection and an initial phase angle of fault point reflection need to be considered are solved. Meanwhile, due to the fact that other interference signals are irrelevant with traveling wave signals, the high-tension transmission line single-ended traveling wave fault distance detection method combined with the time-frequency characteristics has the advantages of being high in anti-interference capacity, easy to operate, high in distance detection accuracy and very suitable for distance detection on site.

The invention discloses a measurement device and method for fiber loop fusion point reflection in a photonic bandgap fiber gyroscope. The measurement device comprises a laser source, a coupler, a Y-waveguide, a photonic bandgap fiber loop, a detector, a signal generator and an oscilloscope. An output tail fiber of the laser source is in butt joint with a tail fiber O1 of the coupler through a flange, an end O2 of the coupler is welded with a tail fiber of the detector in a fusion manner, an end O3 of the coupler is welded with an input tail fiber of the Y-waveguide in a fusion manner, and an output tail fiber of the Y-waveguide is provided with an end face A and an end face B. According to measurement requirements, the end face A or end face B is selected to be welded with a tail fiber of the photonic bandgap fiber loop in a fusion manner, and a fusion point is A or B. The signal generator provides a modulating signal to the Y-waveguide, and the oscilloscope is used for detecting signals of the detector. The measurement method for fusion point reflection of the photonic bandgap fiber gyroscope adopts sawtooth wave modulation. Reflection of the fiber fusion point can be measured in real time during fusion welding, and online quality inspection of the fusion point is realized.

This invention relates to one optical coat film reflection rate measurement and display method for optical film monitor, which uses computer for rapid data process function and processes online measurement and real time display in the coating process and determines the coat terminate point according to the coat film curve peak or trough point reflection value.

The invention provides a method for removing a single-terminal traveling wave fault location dead area of a high-voltage power grid in a coal mine, and belongs to a method for single-terminal traveling wave fault location of the high-voltage power grid in the coal mine. A traveling wave instant power is defined; a fault feature wave tip is identified by means of a method that special wave tips are mutually verified, and a location dead area problem is solved; a calculation value of a circuit topological parameter known structure is compared with a measurement value, wave tips reflected by non-fault circuits are removed, and a reflection wave tip of a bus at the opposite end of a fault circuit and fault point reflection wave tips, namely the special wave tips are searched; by means of further classification calculation of the special wave tips, the function of removing the location dead area is achieved, meanwhile fault precise location is achieved, and the location errors are within 100 meters by means of large quantities of simulation and on-site data tests. The method has the advantages that the distinguishing degree of the traveling wave tips is improved under high noise in the practical power grid; in the power grid of the coal mine, by means of the method that the two special wave tips with faults are mutually verified, the problems that in circuits with mixed cables, the wave velocity is not consistent, and the wave tips are difficult to identify are solved.

The invention discloses an antenna impedance automatic matching device based on a parasitic resonance frequency point. The antenna impedance automatic matching device comprises an antenna (1), an electrically tunable matching module (2), an antenna parasitic resonance frequency point reflection measurement module (3), a processing and control module (4), a coupler module (5), a blocking capacitor (6) and a filter (7), wherein the antenna parasitic resonance frequency point reflection measurement module (3) transmits an antenna parasitic resonance frequency point frequency-sweeping signal to the coupler module (5), performs synchronous detection and low-pass filter on a reflecting signal which is output by the coupler module (5), and outputs a reflection coefficient amplitude signal; and the processing and control module (4) extracts the offset and variation of an antenna operation resonance frequency point after frequency is swept at each time according to the reflection coefficient amplitude signal, generates matched control voltage and controls the electrically tunable matching module (2) to realize automatic matching of antenna impedance. The antenna impedance automatic matching device has the advantages that the operation resonance frequency point offset of a single-receiving antenna can be compensated, and an effective gain of the single-receiving antenna is improved.

The invention discloses the technology to explore palm surface frontage geology and measure frontage rock rolling velocity using reflection in the tunnel and underground engineering. It sets up two intersecting measuring lines in the palm surface, and sets up a measuring point at each certain distance on the line, and each measuring point makes the small shock - distance measuring or the excitation and reception of the small transmitter-receiver distance, and then, by unitary method, the time curves of each measuring point converge to a time profile. With the time profile, when the reflection of each reflector surface corresponding reflecting the axis and each measuring point, it determines each reflector surface, and if the rock rolling velocity known, it calculates the position of each reflector surface according to the reflection time of the measuring points. In the rear sidewall of the palm surface, sets up the measuring lines, and many measuring points on it, to measure the reflection time of each point from the reflector surface. Assuming the rock rolling velocity, according to the measuring point reflection time measured in the palm surface, calculates the invented reflector surface space position, and calculates the reflection time of sidewall measuring points to invented reflector surface under the rolling velocity assumption, and compared with the practical measuring reflection, then to adjust the assumed rolling velocity value, and gradually approaching, to obtain the closest actual rolling velocity value.

The invention belongs to the electric power system monitoring field and especially relates to a power cable fault voltage traveling wave range finding method. The method is characterized by carrying out opposite end loop on a detected circuit; applying a high-voltage pulse signal to a sound phase of a detected power cable; simultaneously, recording voltage traveling wave reflection waveforms of a fault phase and another sound phase; and using a time difference of first wave peaks or wave troughs of traveling wave data of the fault phase and the sound phase to analyze and calculate a fault distance. By using the method, high accuracy is possessed; polarities of a fault point reflection pulse and a sphere gap pulse are opposite so that the fault point reflection pulse and the sphere gap pulse are easy to distinguish; and simultaneously, in a voltage traveling wave method, a high voltage capacitor does not need to be added and there is little increase in cost.

A reflection-type variable optical attenuator comprises: a main attenuator unit including a first birefringent crystal plate, a Faraday rotational angle varying unit, and a second birefringent crystal plate arranged in this order; an input port and an output port that are arranged on a side of one end of the main attenuator unit; and a two-point reflection-type optical path varying reflector that is arranged on a side of the other end of the main attenuator unit. Light that comes in from the input port makes a round trip in the main attenuator unit and goes out through the output port.

The present invention provides a liquid crystal display, comprising: a plurality of pixels arranged in a matrix, each pixel including a first sub-pixel and a second sub-pixel; a plurality of first gate lines connected to the first sub-pixel; a plurality of first sub-pixels Two gate lines, connected to the second sub-pixel; and a plurality of data lines, crossing the first and second gate lines, connected to the first and second sub-pixels, and transmitting data voltages, wherein the first and second sub-pixels of each pixel The voltages of the two sub-pixels have opposite polarities and are obtained from a single image information, and the data voltage carried by the data line is inverted by N×1 (N=1, 2, . . . ), N:M×1( M=1, 2, ...) point inversion, or N row inversion.

The invention provides a tunnel advanced geological forecast three-dimensional modeling method and system based on BIM. The method comprises the following steps: constructing an advanced geological forecast data relationship library, wherein the advanced geological forecast data relationship library associates a first data storage table and a second data storage table by taking a measuring point ID as a main key, the first data storage table stores a measuring point ID, a measuring point initial position space coordinate and a name of a project to which the measuring point belongs, and the second data storage table stores a measuring point ID, a measuring point space coordinate and a measuring point reflection coefficient; accessing an advanced geological forecast data relationship library, and reading a measurement point initial position space coordinate, a measurement point space coordinate and a measurement point reflection coefficient associated with a specified measurement point ID in the specified project name as modeling original data; using BIM software to call modeling original data, carrying interpolation fitting of equipotential surface according to a set grid density value and reflection coefficient equivalence, taking a preset reflection coefficient reference value as a geological forecast critical value to determine a geological forecast critical surface, and thenconstructing an advanced geological forecast body three-dimensional model.

The invention is applicable to the field of image processing, and provides a method and a system for detecting image foregrounds. The method comprises the following steps of acquiring an image to be detected and a projection image; acquiring a first color value and a second color value; acquiring point reflection significance values of pixel points at the same positions in two images according to the first color value and the second color value; removing textures and backgrounds of the image to be detected by using a mean shift segmentation algorithm; dividing the image to be detected into a plurality of different areas; acquiring area reflection significance values of the areas according to the point reflection significance values; comparing the point reflection significance values of the pixel points and the area reflection significance values of the areas of the pixel points; and confirming the foreground in the image to be detected according to a comparison result. By the method and the system for detecting the image foregrounds, an interactive projection system can easily acquire a foreground image under the condition that illumination is complex and changeable.

The present invention relates to a fault actual measurement data-based transmission line length calibration method, and belongs to the electric power system relay protection technology field. The method of the present invention comprises the steps of when a transmission line MN goes wrong, propagating a fault current traveling wave to the measurement end of a bus M; acquiring a fault current traveling wave at the measurement end of a line MM by a traveling wave fault distance measurement device, and separately recording the time when a fault initial traveling wave head wave tip, an opposite-end bus reflection wave tip and a fault point reflection wave tip reach the measurement end, and then calculating the sum of the time difference of the opposite-end bus reflection wave tip and the fault initial traveling wave head wave tip and the time difference of the fault point reflection wave tip and the fault initial traveling wave head wave tip separately, and finally utilizing the empirical wave velocity to calibrate the total length of the line MN. According to the present invention, the transmission line length is calibrated based on the fault actual measurement data, so that the calculated and used line length gets closer to the actual line length, and a distance measurement result error becomes small.

The invention belongs to the technical field of electromagnetism / light scattering and propagation of vortex beams carrying orbital angular momentum, and discloses a method for analyzing polarized Bessel vortex beam transmission in an anisotropic medium. The method comprises the steps of firstly establishing a global coordinate system and a local coordinate system; utilizing a spherical vector wavefunction to unfold the incident polarization Bessel vortex beam, and then utilizing a conversion relation between the spherical vector wave function and a cylindrical vector wave function to obtain acylindrical vector wave function unfold of the polarization Bessel vortex beam at any oblique incidence angle; obtaining cylindrical vector wave function expansion of the internal field of the mediumby utilizing an intrinsic plane angle spectrum method; establishing an expansion coefficient cascade expression of the multilayer anisotropic medium, and solving expansion coefficients of the reflection beam and the transmission beam; substituting the expansion coefficient into a corresponding field intensity expression to obtain the electric field intensity and the magnetic field intensity of any point reflection field and transmission field in the space. According to the method, the property change of the vortex beam during propagation in the multilayer anisotropic medium is calculated, thecalculation precision is higher, and the application range is wider.

The invention discloses a power grid fault intelligent positioning method and system, and relates to the field of fault positioning of a power grid. The method includes following steps: step S001, establishing a power grid distribution model; step S002, installing traveling wave recording apparatuses at two ends of lines and branch terminals; step S003, starting an electronic timer when the traveling wave recording apparatuses receive faulty initial traveling waves; step S004, receiving the time reaching two ends for the traveling waves by the traveling wave recording apparatuses at two ends of the lines; step S005, calculating the distances from a fault point to two ends after information exchange through a communication network; and step S006, displaying the position of the fault point at the power grid distribution model. According to the method and system, the time difference from the initial travelling wave surge and the fault point reflection wave to a measuring end bus is obtained, fault locating of the power grid is realized by employing a formula, fault display of the power grid is realized through a Web server, related staff can be helped to rapidly search the faults, anda lot of manpower, material resources and financial resources consumed by fault line patrol are reduced.

The invention discloses an all-fiber superfluorescent light source. The all-fiber superfluorescent light source comprises a gain fiber and a pumping source, wherein a fiber of the pumping source is connected with the side surface of the gain fiber. The gain fiber is complete. By adopting side surface connection and the complete gain fiber, a disconnection fusion point is prevented from being generated on the gain fiber, laser oscillation caused by fusion point reflection can be prevented from damaging the pumping source or the gain fiber. Multi-point side surface connection can be adopted, and therefore output power levels can be improved wholly. The all-fiber superfluorescent light source is novel in structure and outstanding in feature, and high-power superfluorescence can be obtained.

The invention discloses a head-up displayer, which comprises a backlight system, a plurality of folding mirrors, and a half-reflecting mirror, wherein the backlight system is used for forming and emitting a full-color laser image, the backlight system comprises a backlight source for emitting RGB threecolor laser beams; the folding mirrors reflect the full-color laser image formed in the backlightsystem; the half-reflecting mirror reflects the full-color laser image reflected by the folding mirror to human eyesand forms a virtual image; the half-reflecting mirror comprises a mirror body and athree-point reflection film arranged on the mirror body in a plating mode, and the transmittance of the full-color laser image at the mirror body is 93% to 99%; the mirror body is provided with a light incident surface close to the folding mirrors and a light exiting surface away from the folding mirrors, the three-point reflection film is arranged on the light incident surface in a plating mode,the three-point reflection film is obtained by stacking a plurality of TiO2 plating layers, a plurality of MgO plating layers and a plurality of SiO2 plating layers, and the three-point reflection film can reflect at least 90% of RGB threecolor laser light. The head-up displayeris high energy utilization rate, good in definition, and low in cost.

The invention relates to a chain network external fault location extension method, belonging to the technical field of power system relay protection. The method includes that in the chain network consisting of three ends, a line MN is a cable, a line NP is an aerial conductor, and only a transformer station connected to a bus M is equipped with a traveling wave location device inside, when the power transmission line NP, which is not monitored by the traveling wave location device, has faults, the current traveling wave of the measuring end TA1, close to the bus M side, in a healthy line MN is acquired by the traveling wave location device, the time for the transmission of the initial travelling wave to the TA1 through the healthy line MN and the time for the transmission of the fault point reflection wave to the TA1 through the healthy line MN are respectively recorded, and the time difference Delta t is calculated, and at the end, the fault distance lf is calculated through the combination of the location theory and empirical velocity. According to the invention, one only needs to install a detection device at one end of the chain network, so that the defects of difficult fault location of circuits that are not monitored and high running cost of a double-end travelling wave method are overcome and the construction cost is reduced.

The invention provides a cable joint core temperature inversion method and system based on the cable surface temperature, comprising: step 1, performing radial temperature inversion according to the one-dimensional transient thermal circuit model of the cable and the surface temperature measurement point temperature of the cable body Step 2: Use the finite element temperature field simulation method to construct a two-dimensional cable temperature field simulation model, and simulate the cable core contact point and cable core at different loading currents and different times The transient temperature of the fitting point is obtained to obtain the transient temperature simulation data set; step 3, taking the transient temperature of the cable core contact point as the independent variable and the transient temperature of the cable core fitting point as the dependent variable, the transient temperature simulation data set Perform fitting to obtain the cable core axial temperature function; step 4, combine the cable core fitting point inversion transient temperature and the cable core axial temperature function to obtain the cable core contact point temperature. The present invention utilizes the surface temperature of the cable body to obtain accurate cable core contact point temperature through inversion and fitting, which is simple and convenient.

The invention relates to a measuring device, in particular to a measuring device for the torsion characteristics measurement including a component torsion measurement or the main cable of a suspension bridge and the like, and further relates to the method beneficial for the measuring device to measure. The measuring device for element torsion and position parameters comprises a fixing seat, and is characterized by further comprising three optical reflectors connected with the fixing seat; the fixing seat can be fixed on a tested element, and three optical reflectors connected with the fixing seat and the tested section of the tested element are located on a same plane. A principle of using the device to measure is that the three-dimensional coordinates of three observation points of a measuring point reflection unit at all stages are measured through a total station; furthermore, the data processing is carried out on the obtained three-dimensional coordinate, so that the central coordinates and the torsion angles of the tested section of the main cable at all stages can be obtained. The measuring device provided by the invention is simple in structure, low in measurement cost and good in effect.

The invention discloses a method and a device for generating reflection angle gathers of common imaging points. The generating method generates a common imaging point reflection angle gather by using a pre-stack time migration method, and the generating method includes: obtaining a slice velocity, where the slice velocity is the velocity of seismic wave propagation in the formation; calculating the incident angle according to the slice velocity, wherein the incident angle The angle is the incident angle of the seismic ray; and the common imaging point reflection angle gather is generated according to the incident angle. The invention solves the problem of inaccuracy in generating the reflection angle gather of the common imaging point in the pre-stack time migration method in the related art.

The invention provides an OTDR-based photonic crystal fiber ring fusing point reflection intensity determining method. By fusing polarization maintaining optical fibers to two sides of a photonic crystal fiber and measuring the fusion point back reflection from the polarization maintaining optical fiber on one side by using an OTDR, back reflection of fusion points in a photonic crystal fiber ringcan be simulated, disturbance of gyro signal light to measurement can be suppressed, and independent measurement of back reflection can be realized. For solving the problem of low measurement precision of the OTDR, a non-fusion end face of the polarization maintaining optical fiber on the other side is cut to obtain an optical fiber cleavage surface perpendicular to the light transmission direction, and the surface becomes a Fresnel reflection surface which enables the back reflection intensity to be calculated accurately. With the back reflection light intensity relative ratio of the opticalfiber fusion points and the Fresnel reflection surface obtained from an OTDR measuring curve and the calculated absolute reflection intensity of the Fresnel reflection surface, the fusion point backreflection intensity can be obtained accurately. The method solves the problem that the fusion point back reflection intensity in a photonic crystal fiber ring cannot be measured and is high in measurement accuracy.

A magnifying cosmetic mirror may provide a three-point reflection path that may be utilized to apply cosmetics around the eye of a user. The cosmetic mirror may be constructed to have a base mirror and side mirrors extending at angles from opposite sides of the base mirror. The side mirrors may be constructed to provide a reflective view of the eye when placed above the base mirror. The base mirror may also be constructed to provide a reflective view of the eye, and each mirror may be substantially flat.

The invention discloses a visual position-pose measurement method based on point-line combination characteristics, which belongs to the technical field of computer vision measurement and relates to a method applicable to measurement on the position and pose of a split-type cylinder-like object moving at high speed. The surface point-line combination characteristics of the cylinder-like object moving at high speed are acquired by a binocular visual system; a target axis and a local coordinate system can be obtained through five steps of calibrating by a high-speed camera, segmenting a point-line characteristic image, extracting characteristic marks, matching the characteristic marks, and acquiring the position and the pose, and then target position-pose information is acquired according to the target axis and the local coordinate system; the point-line combination characteristics consists of circle reflection marks with two axes respectively formed at the front segment and the rear segment of a target object coinciding with target axes, and four point reflection marks which are uniformly distributed at the circumference of the middle segment of the target object and are restrained from different distances to the circle at the front end. The problems that the axis of the cylinder-like object is not easy to acquire, the precision of the acquired axis is low, and the surface mark can not be precisely positioned due to the repeated assembly of the split-type object are solved by utilizing straight-line characteristics of strong anti-noise capacity and large information amount which are matched with point characteristics.

The invention discloses a light gathering power transmission one body type integration relay system. The system comprises several light transmission relay units which are arranged in series and / or in parallel and several sunlight mirror arrays. The previous level light transmission relay unit successively transmits the gathered light to the next level light transmission relay unit so as to prolong a transmission distance. The light transmission relay units comprise light collection devices which are used to collect the light reflected by the sunlight mirror arrays and far point reflection gathering apparatuses which are used to carry out reflection and gathering to the gathered light, wherein one far point reflection gathering apparatus corresponds with one light collection device or several light collection devices which are parallely arranged. The system of the invention is formed by combining one or more light gathering power transmission one body type integration relay apparatuses. A light path system is established between a plurality of the sunlight mirror arrays and photothermal conversion heat collection devices. Restrictions of space and geographical obstacles can be overcome, apparatuses can be simplified and costs can be reduced.

The invention discloses an antenna impedance automatic matching device based on a parasitic resonance frequency point. The antenna impedance automatic matching device comprises an antenna (1), an electrically tunable matching module (2), an antenna parasitic resonance frequency point reflection measurement module (3), a processing and control module (4), a coupler module (5), a blocking capacitor (6) and a filter (7), wherein the antenna parasitic resonance frequency point reflection measurement module (3) transmits an antenna parasitic resonance frequency point frequency-sweeping signal to the coupler module (5), performs synchronous detection and low-pass filter on a reflecting signal which is output by the coupler module (5), and outputs a reflection coefficient amplitude signal; and the processing and control module (4) extracts the offset and variation of an antenna operation resonance frequency point after frequency is swept at each time according to the reflection coefficient amplitude signal, generates matched control voltage and controls the electrically tunable matching module (2) to realize automatic matching of antenna impedance. The antenna impedance automatic matching device has the advantages that the operation resonance frequency point offset of a single-receiving antenna can be compensated, and an effective gain of the single-receiving antenna is improved.