35 results about "Borehole radar" patented technology

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 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 an asymmetric broadband dipole antenna for drilling radar, which comprises a base plate and a hollow metal pipe arm, the end of one side of the metal pipe arm is arranged in a cone shape, and the interior of the metal pipe arm is divided by a partition plate in the length direction Form an upper cavity and a lower cavity; the end of the cone is located on the side of the upper cavity as the opening, and the side of the lower cavity is the closed end. The end of the partition on the side of the cone is connected to the side wall of the end of the cone; the base plate The upper surface is etched with interconnected microstrip lines and microstrip arms, and the substrate on the side etched with microstrip lines is placed on the separator. The microstrip line constitutes the upper conductor of the impedance transformer, and the separator constitutes the lower conductor of the impedance transformer. Conductor; the side wall of the non-tapered body end of the metal pipe arm is provided with a wire passing hole.

The invention discloses a high-efficiency imaging method for multi-input multi-output drilling radar based on high degree of freedom. The method completes the sampling space in the high-degree-of-freedom sampling data matrix by improving the imaging degree of freedom of multi-input multi-output drilling radar sampling data The conversion to the target space realizes high-efficiency and high-precision imaging of the multi-input multi-output drilling radar sampling data; Influence, use fast Fourier transform to obtain the frequency wavenumber spectrum of the sampling data in the expanded high-degree-of-freedom sampling space, and bridge the sampling space and the target space to obtain the imaging results of the target space, and realize the sampling of multi-input and multi-output drilling radar High-efficiency and high-precision imaging of data enhances the application value of multi-input and multi-output drilling radar in practical engineering.

The invention relates to a method for detecting the roof and floor interface of a coal seam by using a borehole radar in a coal mine. The method includes: collecting radar wave signals; forming a time-domain borehole radar profile according to the radar wave signals; Interface distance: According to the drilling distance of the working face, the coal seam interface distance of the top and the floor and the radar wave signal, determine the event axis of the reflected wave of the roof and the floor; The time-domain radar profiles of the top and bottom plates are used to form the interface images corresponding to the top and bottom plates. According to the solution of the present invention, according to the event axis of the reflected wave of the top and the bottom plate and the time domain drilling radar profile, the time domain radar profile corresponding to the top and the bottom plate is determined; according to the time domain radar profile corresponding to the top and the bottom plate, the interface corresponding to the top and the bottom plate is formed The image realizes high-accuracy and high-safety coal seam roof and floor interface detection.

The invention belongs to a hardware component unit of a well radar logging system, in particular to a front end of a well radar step frequency controllable gain receiver. The invention realizes the real-time adjustment and control of the gain step value through the single-chip microcomputer control circuit according to the magnitude of the final output signal, and provides a controllable gain control function of open and closed loops. The mixer and filter circuit have down-converted the input signal at least twice, so that the frequency bandwidth of the final output intermediate frequency signal is very narrow, and the instantaneous bandwidth corresponding to the receiver is very small, which effectively suppresses the noise interference and improves the system sensitivity. In the gain control unit, the use of the gain equalizer achieves high gain flatness, and finally provides a linear gain control of -13dB ~ 95dB, and a gain step of 0.5dB ~ 16dB. The invention realizes the asynchronous mode of sending and receiving, high gain flatness and convenient gain control; it is suitable for a receiver system with a large variation range of received signals.

The invention discloses a system and method for real-time reflection and advanced detection of geological conditions applied to a drilling rig, comprising: a drilling rig; a high-precision rock strata drilling probe with sensors for collecting rock physical and mechanical property parameters during the drilling process; a drilling rig Real-time analysis system of advanced parameters; drilling radar, including transmitting antenna and receiving antenna for detecting electromagnetic wave signals of surrounding rock parameters and water layers and other unfavorable geological bodies within a certain range around the drill bit. Using the real-time reflection and advanced detection system of geological conditions, not only the real-time analysis system of drilling parameters can be used to accurately determine the type and physical and mechanical properties of the rock formation within the drilled hole diameter, but also the drilling radar can be used to predict the location of the drill bit within a certain range. The condition of the surrounding rock is presented in the form of a stratum distribution map, and the surrounding rock information including the crack angle, number, and stratum boundaries can also be recorded by using a high-precision strata drilling detector.