35 results about "Borehole radar" patented technology

The invention discloses an advanced detection device and method for unfavorable geology and rock mass mechanical properties of deep and long tunnels. The device comprises a drilling machine, a sensing system, a data conversion system and a data analysis system. The sensing system is installed on the drilling machine; the sensing system, the data conversion system and the data analysis system are connected successively; and the sensing system comprises a drill bit displacement acquisition unit, a rotation speed acquisition unit and a pressure acquisition unit. According to the advanced detection device and method, boreholes and borehole radars are combined, and a sensor technology is used for acquiring parameters of rotation speeds, drill bit displacement, torque, propulsion, impact energy, pumping pressure and the like in real time, and accordingly, rock mass physical and mechanical parameters and joint fissure distribution and occurrences in the geologic body within 30 meters ahead are forecast accurately, whether water body situations exist in a 10m range around a borehole is detected accurately, the cost is low, and the occupied construction time is short.

The invention relates to a three-dimensional foundation pile detection device and method based on a borehole radar. On the basis that a foundation pile is internally provided with a through hole, and the through hole extends in the axial direction of the foundation pile, the three-dimensional foundation pile detection device based on the borehole radar comprises the borehole radar, a traction module and a central control module. The borehole radar comprises an in-well antenna and a radar body, wherein the in-well antenna is connected with the radar body, and the radar body is connected with the central control module. The three-dimensional foundation pile detection method comprises the steps of positioning the in-well antenna, conducting three-dimensional scanning detection, conducting shifting detection, transmitting data, generating a three-dimensional image and the like. By the adoption of the technical scheme, detection of the integrality of the foundation pile, the thickness of pile bottom sediments and the length of a steel reinforcement cage can be achieved, the three-dimensional image can be obtained, and a detector can visually see the conditions of the foundation pile and the surroundings of the foundation pile.

The invention discloses a method for borehole radar image rock stratum classification based on texture features. The method includes step (1) of establishing a sample library; step (2) of acquiring across-sectional image of a borehole radar image to be classified to obtain an image to be classified; step (3) of performing sample image feature extraction and training; step (4) of extracting features of the image to be classified; step (5) of performing rock stratum classification on image blocks to be classified: performing similarity matching according to an obtained texture feature matrix; classifying the image blocks to be classified into a category with the largest similarity, and outputting rock stratum classification results; and step (6) of repeating steps (4)-(5) until each image block of the image to be classified is classified, to achieve texture classification of the borehole radar image. According to the method, in the borehole radar image cross-sectional image, the texturefeatures in the image are directly extracted to describe the rock stratum structure, the signal processing process is simplified, and the judgment basis and effective conditions are provided for theautomatic identification and classification of the rock stratum structure.

The invention belongs to an omnidirectional cylindrical dipole antenna for underground earth-probing radars, which comprises tubular monopole antenna cylinders, conical antenna heads, loading resistors, corresponding compression springs, inter-section fixing sleeves, supporting tubes, nut sleeves, connecting and fixing sleeves and coaxial cables, the loading resistors and the corresponding compression springs are respectively arranged in the holes of each two end surfaces between the antenna heads and the antenna sections and between the antenna sections, and monopole antennas are formed by the nut sleeves. Since the invention arranges the loading resistors between the antenna heads and the antenna sections and between the antenna sections to change the distribution of the current of the surface of the antenna, not only is the performance of the antenna improved, but also the production technique is simplified, the antenna can be matched with a borehole radar to operate under the conditions of center frequency equal to about 100M and bandwidth greater than or equal to 120M, the obtained waveform is neat, the main-to-side lobe ratio is distinct, tailing is tiny, and the waveform is stable; and consequently, the antenna is characterized in that: the comprehensive performance is high, the structure is simple, the diameter is small, the production cost is low, and the antenna can be matched with the borehole radar under the conditions of low frequency band and high bandwidth, and can effectively increase the performance, detection range and efficiency of the borehole radar.

The invention discloses a mine borehole radar fine detecting device based on drilling machine pushing and a detecting method thereof. A drilling machine, a drilling pipe, a non-metal drilling pipe, a borehole radar instrument, a non-metal drilling pipe, a drilling bit, a hole depth recorder and an explosion-proof mobile phone are included; the hole depth recorder is installed on the drilling machine to record the depth of the borehole radar instrument in drilling holes; the explosion-proof mobile phone communicates with the hole depth recorder and the borehole radar instrument, and time synchronization, parameter command issuing and transmission data issuing are carried out on the hole depth recorder and the borehole radar instrument; the borehole radar instrument comprises a control center module, a data storage module, a WIFI communication module, a battery, a trajectory measurement module, a transmitting antenna, a receiving antenna, a signal transmitter, a signal receiver and the like. The drilling holes in a coal mine can be detected, and the depth of the drilling holes being more than 500m can be detected, the interface position of a geological anomaly body, a water-containing anomaly body and a coal seam top and bottom plate within the range of 1m-10m on the periphery of the drilling holes can be detected, the resolution ratio is up to 0.15m-0.3m, and fine guidance basis is provided for intelligent mining in the underground coal mine.

The invention discloses a borehole radar imaging method based on non-uniform spectrum estimation. The method comprises the steps of (A) initializing borehole radar sampling data and establishing a displacement data vector table, (B) quickly acquiring spectrum of non-uniform space sampling data by using using a spectrum estimation algorithm, (C) performing interpolation on an estimated spectrum ofthe sampling data obtained in the previous step to obtain a target spatial spectrum, and step (D) obtaining a target spatial image. Through the above principle, the high-efficiency and accurate imaging of the non-uniform sampling data is improved under the premise of ensuring the imaging quality of a borehole radar, and the practical application value of the borehole radar is improved.

The invention relates to a drilling radar detector in-hole centering device which comprises a mounting frame, a conical barrel, a rubber barrel, a first connecting rod, a second connecting rod, a semicircular shell, a roller, a first spring, a first torsion spring, a driving mechanism and a guide mechanism. The conical barrel is fixedly connected among the four sides in the mounting frame; the guide mechanism is mounted in the circumferential direction of the outer side of the conical barrel; and the driving mechanism is mounted between the two sides of the mounting frame. According to the invention, a drilling radar is placed in the rubber barrel to be clamped, the drilling radar corresponds to a hole entrance, the driving mechanism is started, the driving mechanism does not limit the rubber barrel, the rubber barrel drives the drilling radar to move downwards into a hole under the action of gravity, and the roller is in contact with the inner wall of the hole to guide the rubber barrel, i.e., the drilling radar is guided, so that the influence of swing of the drilling radar on a detection result can be avoided, and the drilling radar cannot be in contact with the inner wall of the hole to cause abrasion.

The invention discloses a high-efficiency imaging method for a multi-input and multi-output borehole radar based on high degree of freedom. The method completes transformation from sampling space to target space in the high degree of freedom sampling data matrix by improving imaging freedom of the multi-input and multi-output borehole radar sampling data to realize high-efficiency and high-precision imaging of the multi-input and multi-output borehole radar sampling data. According to the high-efficiency imaging method for the multi-input and multi-output borehole radar based on high degree offreedom, influences of variable spacing of different transceiver elements on the multi-input and multi-output borehole radar are eliminated; frequency wavenumber spectrum of the sampled data in the extended high degree of freedom sampling space is obtained by using express Fourier transform; the sampling space and the target space are bridged to obtain a target space imaging result; high-efficiency and high-precision imaging of multi-input and multi-output borehole radar sampling data is realized and the application value of multi-input and multi-output borehole radar in practical engineeringis improved.

The invention discloses an auxiliary moving device for a drilling radar antenna. The auxiliary moving device comprises the drilling radar antenna and a fixed bushing. The drilling radar antenna movesback and forth in the fixed bushing through a guide device, the fixed bushing comprises a bushing body, and one end of the bushing body is a fixed end and is fixed to a tunnel face. The other end of the bushing body is a sealed end, and a sealing cover is arranged at the end. The guide device comprises a bottom wire fixer, a top wire fixer, a pulley block, traction ropes and at least two sets of moving devices. By constructing the guide device, stable reciprocating motion of the drilling radar antenna in the fixed bushing can be ensured when the advancing traction ropes and the retreating traction rope are respectively pulled. By controlling the speed of pulling the advancing traction ropes and the retreating traction rope, the uniformity of the motion speed of the drilling radar antenna is ensured, and the probability of equipment damage is reduced or even avoided. By means of combining of all technical means, the advancing speed of the drilling radar antenna is high, back-and-forth detection is convenient, and the detection efficiency is effectively improved.

The invention provides a method for constructing a coal mine transparent working surface by using a borehole radar. The method comprises the following steps: collecting data of a target area; designing the group number, the quantity and the tapping points of drill holes; carrying out borehole radar measurement: measuring an actual distance between a hole opening position and a top and bottom plate interface; calculating the in-situ dielectric constant of a coal seam; carrying out borehole radar data depth and time correction processing; carrying out borehole radar data noise elimination processing; respectively tracking and reconstructing events of a top plate and a bottom plate by using an orifice positioning method; carrying out top and bottom plate event offset imaging; merging the data after the offset of the top plate and the bottom plate; preprocessing drilling hole track measurement data; calculating a three-dimensional space track of the drilling hole; performing linear interpolation on the drilling hole track until the depth sampling interval is consistent with the depth sampling interval of the borehole radar; calculating the spatial positions of the top and bottom plates in combination with the drilling hole track to form a single-hole top and bottom plate spatial position data set; and combining information of a plurality of drilling holes to form a geologic body three-dimensional data body in front of the head-on.

The invention provides a four-direction monopole directional antenna system and method for borehole radar detection. The system comprises a borehole radar directional antenna system, a sequential feeding device, an in-borehole walking device, and a cable transmission device, wherein the borehole radar directional antenna system comprises a four-direction directional transmitting monopole antenna group, an omnidirectional receiving antenna and a sleeve, the four-direction directional transmitting monopole antenna group is used for sequentially and directionally radiating electromagnetic waves to each direction, the omnidirectional receiving antenna is used for receiving reflected waves, and the four-direction directional transmitting monopole antenna group and the omnidirectional receiving antenna are arranged in the sleeve; the sequential feeding device is used for sequentially controlling the drilling radar directional antenna system so as to sequentially and directionally radiate electromagnetic waves in different directions at the same depth, and detection without rotation is realized; the in-borehole walking device is arranged on the outer side of the sleeve and drives the whole drilling radar directional antenna system to move in a drilled hole; and the cable transmission device is used for transmitting a detection result of the drilling radar directional antenna system to a processor arranged on the ground and the sequential feeding device. Multi-directional orientation can be achieved without rotation, the diameter size is smaller than the engineering drilling size, the orientation performance is stable, and mutual coupling is avoided.

The invention discloses an antenna direction control device for a directional drilling radar. The antenna direction control device comprises an antenna outer pipe, an antenna inner pipe, a direction control rotating mechanism and a supporting rotating mechanism. The antenna inner pipe is arranged in the antenna outer pipe, and a main body control unit, a shielding butterfly antenna and an antennapose detection unit are arranged in the antenna inner pipe; the direction control rotating mechanism comprises a driving motor, an inner pipe connecting piece and an outer pipe connecting piece, the inner pipe connecting piece is fixedly connected with a machine body of the driving motor, the outer pipe connecting piece is fixedly connected with a rotating shaft of the driving motor, the inner pipe connecting piece is fixedly connected with the antenna inner pipe, and the outer pipe connecting piece is fixedly connected with the antenna outer pipe; the driving motor and the antenna pose detection unit are electrically connected with the main body control unit respectively; the supporting rotating mechanism comprises a conductive slip ring, a flange connecting piece and a bearing, the antenna inner pipe and an inner ring of the bearing are fixedly connected with the flange connecting piece, the antenna outer pipe is fixedly connected with an outer ring of the bearing, and the main bodycontrol unit is electrically connected with a remote radar host and a power supply through the conductive slip ring. The device can rectify the deviation of the drilling radar.

The invention relates to a method for detecting a coal seam roof and floor interface by using a borehole radar in an underground coal mine. The method comprises the following steps of: acquiring a radar wave signal; forming a time domain borehole radar profile according to the radar wave signal; acquiring the distance between a working face drill hole and a roof and floor coal seam interface; determining roof and floor reflection wave events according to the distance between the working face drill hole and the roof and floor coal seam interface and the radar wave signal; determining time domain radar profiles corresponding to the roof and the floor according to the roof and floor reflection wave events and the time domain borehole radar profile; and forming interface images corresponding to the roof and floor according to the time domain radar profiles corresponding to the roof and floor. According to the scheme of the invention, the time domain radar profiles corresponding to the roof and floor are determined according to the roof and floor reflection wave events and time domain borehole radar profiles; according to the time domain radar profiles corresponding to the roof and floor, the interface images corresponding to the roof and floor are formed, and high-accuracy and high-safety coal seam roof and floor interface detection is achieved.

The invention discloses a borehole radar step frequency controllable-mode signal source and belongs to a hardware component unit of a borehole radar logging system. The signal source comprises a radio frequency emission source and a local oscillator source, which are used for generating an emission signal and a local oscillator signal separately, wherein the radio frequency emission source and the local oscillator source are used for ensuring the coherence of the radio frequency signal and the local oscillator signal through a synchronous control clock. For the signal source in a directional borehole radar system of a step frequency system for depth logging, the controllable-mode signal source has the advantages of controllable mode, ns-scale fast frequency switching, a controllable step value, high output signal power and a wide frequency range.