376 results about "Seismometer" patented technology

A seismometer having a hydrodynamically efficient shaped body containing a seismic sensor or source, having a propulsion unit located and a control unit for directional control of the propulsion unit for guiding the seismometer to and from an ocean floor. The seismometer can be deployed from a surface ship, helicopter or airplane. The seismometer or surface support vessel contains a navigation unit for directing the control unit to a desired location on the ocean bottom. The apparatus provides a storage device for storing seismic data sensed by the seismic sensor. The navigation system sends a responsive directional command to the apparatus based on the current location and the desired location. Upon arrival at the desired ocean bottom location, the propulsion system acts to couple the apparatus to the ocean floor. A flight control system manages a plurality of the seismometers during navigation to and from the a ocean bottom.

Method for using seismic data from earthquakes to address the low frequency lacuna problem in traditional hydrocarbon exploration methods. Seismometers with frequency response Select Receivers of Desired Frequency Ranges and Design Survey Seismometer Configuration down to about 1 Hz are placed over a target subsurface region in an array with spacing suitable for hydrocarbon exploration (21). Data are collected over a long (weeks or months) time period (22). Segments of the data (44) are identified with known events from earthquake catalogs (43). Those data segments are analyzed using techniques such as trayeltime delay measurements (307) or receiver function calculations (46) and then are combined with one or more other types of geophysical data acquired from the target region, using joint inversion (308-310) in some embodiments of the method, to infer physical features of the subsurface indicative of hydrocarbon potential or lack thereof (26).

A seismic exploration method and unit comprised of continuous recording, self-contained wireless seismometer units or pods. The self-contained unit may include a tilt meter, a compass and a mechanically gimbaled clock platform. Upon retrieval, seismic data recorded by the unit can be extracted and the unit can be charged, tested, re-synchronized, and operation can be re-initiated without the need to open the unit's case. The unit may include an additional geophone to mechanically vibrate the unit to gauge the degree of coupling between the unit and the earth. The unit may correct seismic data for the effects of crystal aging arising from the clock. Deployment location of the unit may be determined tracking linear and angular acceleration from an initial position. The unit may utilize multiple geophones angularly oriented to one another in order to redundantly measure seismic activity in a particular plane.

A single-compartment combined-sphere broad-frequency submarine seismometer, which comprises a submersion coupling frame, a seismometer compartment, a function compartment and an unhooking mechanism. The submersion coupling frame, which is located at the bottom of the submarine seismometer, is provided with a rigid ring to accommodate the seismometer compartment and thereby allow the sealed seismometer compartment (48) inside said seismometer compartment to sit on the seabed directly. The seismometer compartment comprises a bell-shaped protective cover (49) and the sealed seismometer compartment (48). The bell-shaped protective cover (49) opens downwards. The upside of the sealed seismometer compartment (48) is suspended from the top inner surface of the bell-shaped protective cover (49) by multiple cables, and the underside of the sealed seismometer compartment (48) extends beneath the opening of the bell-shaped protective cover (49) to sit flush with the underside of the submersion-coupling frame. The unhooking mechanism is provided on the function compartment (36) and is connected fixedly with the rim of the submersion-coupling frame by a fusible tension steel wire (24), thus fixing the function compartment (36) and the seismometer compartment to the rigid ring at the center of the submersion coupling frame. The seismograph is installed in the sealed seismometer compartment (48) and is thus seated on the seabed directly, whereby the severe distortion of horizontal signals recorded by the submarine seismograph can be effectively overcome without the use of multilayer coupling structures.

The invention designs a method for monitoring an oil well fracturing microseismic ground-borehole crack, which is characterized by comprising the following steps of: receiving microseismic waves by monitoring substations arranged at the circumference of a wellhead by utilizing the propagation characteristic of an elastic wave field in a stratum medium, forming a series of equation sets according to the arrival time difference of the microseismic waves of each substation, and solving the series of equation sets to determine the position of a microseismic source and further determine stratum parameters of crack distribution, such as the azimuth, the length, the height, the ground stress direction and the like. The background noise in a well is small, filtration processing is carried out on a ground observation signal through an underground observation signal, fracturing microseismic signals and ground interferences are screened and distinguished, a detector placed in the well is a reference value of a whole set of system collected signals, the signal collected by a ground seismometer is identified by people through the reference value to filter an interference signal, so that a monitored result of the people can be more true and reliable.

An accelerometer or a seismometer using an in-plane suspension geometry having a suspension plate and at least one fixed capacitive plate. The suspension plate is formed from a single piece and includes an external frame, a pair of flexural elements, and an integrated proof mass between the flexures. The flexural elements allow the proof mass to move in the sensitive direction in the plane of suspension while restricting movement in all off-axis directions. Off-axis motion of the proof mass is minimized by the use of intermediate frames disbursed within and between the flexural elements. Intermediate frames can include motion stops to prevent further relative motion during overload conditions. The device can also include a dampening structure, such as a spring or gas structure that includes a trapezoidal piston and corresponding cylinder, to provide damping during non-powered states. The capacitive plate is made of insulating material. A new method of soldering the capacitive plate to the suspension plate is also disclosed.

The invention relates to a method for performing seismograph control and data transmission by using a short message and a short message control and transmission type cableless seismograph. Aiming at solving the problem of no real-time quality control to the prior cableless seismograph, the method for seismograph control and data transmission introduces a mobile phone unit into an acquisition station for the prior cableless seismograph, and utilizes the short message to conduct state control and data transmission to the acquisition station for the cable-less seismograph. The acquisition stationfor the cableless seismograph comprises a main control unit, an acquisition unit, a storage unit, a GPS unit, a power management control unit and a mobile phone unit. The invention has the advantagesthat the work load of measurement can be reduced, the laying of the acquisition equipment is more flexible, simpler and more convenient, the synchronous collection mode for blasting at the fixed timeis convenient, the construction efficiency is favorable for improving, the data recovery is flexible, an SPS file can be automatically generated, the coordinate with cm-level accuracy can be automatically calculated, the difficult problem of no real-time quality control to the cableless seismograph is solved in a simple and inexpensive way, and the application range and the construction efficiency of the cableless seismograph are greatly improved.

According to a preferred aspect of the instant invention, there is provided a system and method for using satellite communications satellites to control and receive data from a land cableless seismic system. The satellite transmission could transmit control signals (e.g. turn on / off) and receive signals from the remote seismograph units (seismic data, quality control parameters, status, location, etc.) which would subsequently be retransmitted to a processing center or other surface facility.

The invention discloses a submarine earthquake monitoring device and system based on submarine internet of things. According to the monitoring device, sea surface buoy network equipment is connected with submarine network equipment through an anchor system; the submarine network equipment is connected with one or more submarine earthquake detection equipment through submarine photoelectric composite cables; the sea surface buoy network equipment comprises a satellite transceiving device, an internet of things platform server, a network time server and an autonomous energy supply device; the submarine network equipment comprises a photoelectric detachable cabin, a submarine server, a bottom anchor heavy block and a mechanical release device; the submarine earthquake detection equipment comprises a plurality of submarine seismometer network nodes; and the submarine seismometer network nodes are sequentially connected in series end to end through the submarine photoelectric composite cables. The device or the system can be used for submarine structure detection and earthquake disaster and tsunami early warning, and can realize autonomous energy supply and long-time sequence and unattended operation.

A method of determining a turbulent condition in an aircraft with a handheld device where the handheld device has at least one of a gyroscope, seismometer, and an accelerometer where the method includes receiving an output from the at least one of the gyroscope, seismometer, and accelerometer while the handheld device is located within the aircraft and providing an indication of a turbulent condition.

The invention provides a data high-speed transmission system and method of a wireless digital seismic detector. Next generation wireless WIFI (Wireless Local Area Network) and WIMAX (Worldwide Interoperability for Microwave Access) technologies, satellite communication and a wireless MESH network structure are used to construct a four-stage wireless network structure, thus the progressive high-speed transmission of acquired data of the seismic detector from an array node of a radio detector to a seismic data processing interpretation center is realized and the defect caused by a wired digital seismic detector data transmission system can be effectively overcome. The control over the transmission speed of an upstream and downstream link of the system is realized by using a key technology-orthogonal frequency division multiplexing multi-carrier technology of a wireless WIFI and WIMAX technical physical layer and using different sub channel numbers. According to the data high-speed transmission system and method disclosed by the invention, a four-stage wireless transmission network is constructed by adopting the advanced WIFI and WIMAX communication technology and the wireless MESH network structure, thus high-speed seismic acquired data transmission can be realized and an effective high-capacity and high-precision data transmission method for seismic prospecting is provided.

The invention relates to a remote monitoring system and method of a cable-free seismic detector and a field working method. The upper computer of the ground control center communicates with the seismic detector at a farther node through UART, a Beidou commanding machine and a Beidou satellite, and the seismic detector at the farther node and a collecting station form a wireless network through WiFi. Compared with the prior art, the remote monitoring system and method and the field working method have the advantages that the respective limitations of Beidou communication and WiFi communication on seismic detector remote monitoring are broken through by a Beidou communication plus networking transmission mode, effective monitoring of the seismic detector under a depopulated zone environment is achieved actually, and state information inquiring, working state controlling and parameter configuring are achieved; workers can timely discover and process sudden problems during exploration, the collecting station can collect real seismic data, work efficiency of field seismic exploration experiments is increased, and field work cost is lowered.

The invention discloses an underground coal mine in-excavating channel wave seism fore-detection method and relates to the technical field of mining roadway excavation. The method includes the steps of 1), arranging detectors on the roof, the base, the left side and the right side of a excavation roadway on the working face or arranging detectors on one side, wherein every detector is connected with a channel wave seismograph through an acquisition station and data transmission lines; 2), using the vibration of a heading machine in working on the coal wall as a point seismic origin, wherein seismic wave signals generated when a drill of the heading machine shocks coal seam and rock stratum is refracted, scattered and converted in waveform when confronting a geological body interface, and the channel wave transmitted to the rear portion of the heading machine along the coal wall of the roadway and the through channel wave are received by the detector, transmitted to the channel wave seismograph, and subjected to data processing to obtain a detection result; 3), providing real-time underground operating parameters for the excavation according to the detection result. The underground coal mine in-excavating channel wave seism fore-detection method utilizes channel wave seism fore-detection, uses the vibration of the heading machine in working on the coal wall as the point seismic origin, and performs underground state monitoring without interrupting the working.

The invention relates to a storage type earthquake signal continuous collecting system aiming to solve the problems of narrow dynamic range and poor anti-interference ability in the prior seismometercollecting system and comprising a base station and digital geophones. The base station is connected with a plurality of digital geophones which are arranged in parallel through data transmission interfaces and cables; commands are transferred and data are collected between the base station and each digital geophone by adopting a data transmission module; the base station is a control and storagecenter of the storage type earthquake signal continuous collecting system and is used for controlling the data transmission interfaces and the digital geophones to finish receiving of earthquake dataand store the data into an internal memory; the data transmission interfaces are used for finishing the sending of the commands and the receiving of the collected data; and the digital geophones are used for finishing the collecting of analog signals and converting the analog signals to data, and then the data transmission interfaces thereof finish the sending of the data, therefore, the inventionhas the advantages of wide dynamic range, strong anti-interference ability, low cost and capable of supporting collection of tens of thousands of geophones for multiple years.

The invention relates to a piezoelectric digital seismometer on land to solve the problem of poor interference resistance of the conventional seismometer. The seismometer consists of a piezoelectric seismometer, a digitalizing unit and a data communication unit which are connected sequentially, wherein the piezoelectric seismometer and the digitalizing unit are directly connected and integrated into a whole; a piezoelectric material of the piezoelectric seismometer consists of a multi-layer piezoelectric device; and the data communication unit provides the function of data communication with a seismic instrument host system. In the piezoelectric digital seismometer, a core body comprises a cylindrical shell, a substrate, the multilayer piezoelectric device, a mass block and extraction electrodes, wherein the substrate is arranged on the bottom of the shell and is in rigid connection with the shell; the substrate is provided with the piezoelectric material; the piezoelectric material is provided with the mass block perceiving seismic wave movement; and the extraction electrodes are arranged on the upper side and the lower side of the piezoelectric material respectively. The piezoelectric digital seismometer has the advantages of small volume, light weight, high sensitivity, small resistance and strong interference resistance.

An accelerometer or a seismometer using an in-plane suspension geometry having a suspension plate and at least one fixed capacitive plate. The suspension plate is formed from a single piece and includes an external frame, a pair of flexural elements, and an integrated proof mass between the flexures. The flexural elements allow the proof mass to move in the sensitive direction in the plane of suspension while restricting movement in all off-axis directions. Off-axis motion of the proof mass is minimized by the use of intermediate frames disbursed within and between the flexural elements. Intermediate frames can include motion stops to prevent further relative motion during overload conditions. The device can also include a dampening structure, such as a spring or gas structure that includes a trapezoidal piston and corresponding cylinder, to provide damping during non-powered states.

Method for using seismic data from earthquakes to address the low frequency lacuna problem in traditional hydrocarbon exploration methods. Seismometers with frequency response down to about 1 Hz are placed over a target subsurface region in an array with spacing suitable for hydrocarbon exploration (21). Data are collected over a long (weeks or months) time period (22). Segments of the data (44) are identified with known events from earthquake catalogs (43). Those data segments are analyzed using techniques such as traveltime delay measurements (307) or receiver function calculations (46) and then are combined with one or more other types of geophysical data acquired from the target region, using joint inversion (308-310) in some embodiments of the method, to infer physical features of the subsurface indicative of hydrocarbon potential or lack thereof (26).

A prospecting near surface layer configuration investigating method is suitable for the transverse wave of conversion transverse to earthquake prospecting. Its incepting fashion is in the floor excitation well. Vertically make a hole at the research place and the depth of the well is according to the rock nature. The transverse wave excitation source is the hammer horizontal tap taken by the armor plate and sleeper along the uprightness direction to the wall of the well. Adopt general mini type seismograph to incept the longitudinal and transverse wave signal by the three-component geophone inside the well and take a general disposal to get a veracious for the picking the first transverse wave arrival by the data. It solves the excitation and incepting problem of the field surface research to pure transverse wave and gets the surface layer information of longitudinal wave with low cost and handy manipulation. The wave crest, trough and the first transverse wave arrival are clear with enough energy and accurately reflect the change of the surface layer.

Disclosed is a sensor capable of measuring motion in a harsh environment. The sensor uses a fiber optic sensor element formed within a core of an optical fiber that is disposed within an enclosure made of a high strength, corrosion-resistant material. The optical fiber is attached to a supporting fixture in a cantilever fashion so that the intrinsic internal mass of the optical fiber has the freedom to be affected by gravity so that an environmental disturbance acting on the sensor results in a bending strain being applied to the optical fiber. A Bragg grating is located at the bending portion of the optical fiber. The modulation of an optical signal promulgating through the optical fiber is sensed using conventional means and used to measure the magnitude of the environmental disturbance.

Systems and methods are provided for an electrochemical rotational sensor suitable for use in seismic applications that includes a magnetohydrodynamic (MHD) calibrator. The systems and methods allow for a rotational sensor to utilize a smaller toroid electrolyte channel and to be calibrated in a bandpass range of 100 seconds or 100 Hz.

The invention provides a violent earthquake predictor of a liquid suspended and magnetic suspended insulation heavy seismometer. The seismometer connected with a magnet is suspended on a horizontal table magnet, an insulation tube is vertically connected on a horizontal table top, a plurality of laser interferometers with light needles aligned to the outer diameter of the seismometer are connected on the inner wall of the insulation tube, the lower side of an insulation tube cover plate is connected with a electromagnetic transducer used for restricting the seismometer in a non-contact way, the horizontal table is placed on the liquid level of liquid arranged in a small submerged floating ball, a lower compartment of the small submerged floating ball is loaded with fine iron sand and vertically floats in the liquid in a compartment of a large submerged floating ball in a submerged way, a lower compartment of the large submerged floating ball is loaded with coarse iron sand and vertically floats in the liquid in a liquid tank in a submerged way, and a cable and a data wire are connected with a signal amplifier and a computer after the sealing processing. The invention can filter non-earthquake signals through the liquid, can record the rate of displacement of the integral sudden quake of the earth through a non-contact measuring instrument, can obtain parameters of time and regions to generate the violent earthquake through the analysis by earthquake model processing software, and can be used as an instrument for predicting the earthquake through capturing earthquake precursor signals.

The invention relates to a cable-free seismometer long-distance quality monitoring and control system and an outdoor quality monitoring and control method. The cable-free seismometer long-distance quality monitoring and control system is composed of a Beidou satellite, a master control center, a collecting station, a long-distance quality monitoring and control method and a Beidou user machine module communication process management method. Compared with the prior art, cable-free storage-type seismometer long-distance quality monitoring and control are achieved, and the outdoor work flexibility and the outdoor work reliability of a cable-free storage-type seismometer are improved. The characteristics that the Beidou satellite communication technology is wide in coverage scope, high in instantaneity and high in reliability are adopted, stable monitoring and control over the fieldwork quality of the collecting station in field arrangement are achieved, and the monitoring and control scope of the system is not limited by the track pitch. The collecting station is remotely controlled to selectively conduct collecting work, the power dissipation of the system is reduced, and storage space is saved. Arrangement position information of the collecting station is monitored, class reports are recorded, constructors are reasonably scheduled according to information monitoring and controlling results of the collecting station, and the construction efficiency of the outdoor exploration operation of the cable-free storage-type seismometer is greatly improved.

It is an object to provide a tide apparatus comprising a storage tank connected to a underground pit for normally storing water of a constant amount, a connecting pipe for connecting between the underground pit and the storage tank, and a seismograph releasing apparatus formed on the connecting pipe for sensing a shake in an earthquake and for releasing the water stored in the storage tank into the underground pit, wherein the tide plate can protrude upward from the soil foundation face by operating the seismograph releasing apparatus in an earthquake to make the water stored in the storage tank flow into the underground pit via the connecting pipe.

A precise inclined platform device for static calibration of a seismometer comprises a base, a mesa, a rotation mechanism, a drive mechanism, a detection mechanism and a support frame, wherein the rotation mechanism comprises a spindle, a drive arm, a rotary table and a balance block; the spindle is fixed on a left support frame and a right support frame; the drive mechanism and the balance block are respectively located on both sides of the drive arm; the drive mechanism includes a linear motor, a slide table, a linear guide rail, a slider and a grating ruler; the reading head of the grating ruler is fixedly connected with the base, and sends a zero-point signal of the grating ruler when the mesa is horizontal; the sliding table tightly butts against the drive arm, and pushes the rotation mechanism to rotate forward when the linear motor moves in the forward direction; the rotation mechanism can rotate reversely due to gravity action of the balance block when the linear motor drives the sliding table to move in the reverse direction; and the detection mechanism comprises a laser interferometer and a reflecting mirror for reflecting laser back to the laser interferometer to obtain rotation angle of the mesa. The precise inclined platform device has the advantages of high location accuracy, high transmission efficiency and wide application range.

The present invention is directed to methods for coupling seismometers and seismic sources to the ocean floor that results in improved seismic data quality and repeatability for reservoir management and seismic monitoring activities. Piles are configured with a coupling device and permanently installed on the ocean floor. The seismometers or seismic sources are acoustically coupled to the piles on the ocean floor via the coupling device. The pile, seismometer and seismic source may be surface treated with a material that releases divalent cations to enhance both the acoustic coupling and the load holding capacity of the pile. The pile is permanently imbedded into the seabed while the expensive and high-maintenance seismometers and seismic sources are redeployed on the piles as needed.

The invention aims to provide a differential positioning seismometer while drilling to meet requirements while drilling. In the drilling process, the seismometer uses a geophone to measure seismic reflection waves generated when a drilling bit impacts a stratum and convert the measured seismic waves into digital signals which are combined with position information generated by a differential positioning system, time information generated by a high-precision GPS timing system and geophone vertical information generated by an inclination angle sensor to form seismic data in the drilling process, and a drilling well field wireless local area network consisting of data transmission modules realizes the high-speed real-time transmission of the data. The differential positioning seismometer can acquire the seismic waves of fixed points and fixed times in a seismic system while drilling in real time without lagging and realize high-precision differential positioning of collection points; a computer in a monitoring center can realize measuring line display, accurately calculate the track pitch and the offset distance and reduce the seismic interpretation errors; and simultaneously, the inclination angle sensor monitors the inclination angle changes of the seismometer in real time.

The invention relates to a wavelet domain seismic data real-time compression and high-precision reconstruction method based on compressed sensing. The wavelet domain seismic data real-time compression and high-precision reconstruction method comprises the steps of: firstly, carrying out sparse representation on a microseismic signal in a wavelet domain; secondly, constructing a chaos Bernoulli measurement matrix (CBMM) by utilizing a Logistic chaotic sequence, and performing compressed observation on the sparsely-represented microseismic signal by using the chaos Bernoulli measurement matrix; and finally, adopting a Bayesian wavelet tree structure tree structure reconstruction method (BTSWCS), and recovering complete original data. Actual contrast experimental results show that the compression time can be shortened to 10<-5> s by using the wavelet domain seismic data real-time compression and high-precision reconstruction method for compressing data with total sampling points being 2<8>, that is, if a sampling rate of a seismometer is 1 KSPS, the CBMM measurement matrix can realize real-time compression on the acquired 0.25 s data basically. The wavelet domain seismic data real-time compression and high-precision reconstruction method increases a PSNR value by at least 5 dB, significantly improves the peak signal to noise ratio when compared with the greedy algorithm, and reduces reconstruction errors.

The present invention relates to a full-automatic seismic digital signal remote detonation system and remote detonation method. The system comprises a signal transmitting end and at least one end signal receiving end; the signal transmitting end includes a seismometer, an encoder and a central control unit; the signal output end of the seismometer and the signal output end of the central control unit are connected with the signal input ends of the encoder respectively; the signal receiving end comprises a decoder, a wellhead detector and a detonating element; the signal output ends of the decoder are connected with the signal input end of the wellhead detector and the signal input end of the detonating element respectively; and the signal end of the encoder and the signal end of the decoder are connected with each other through a wireless communication module. According to the method, remote detonation can be realized through a wireless communication mode, and protective measures such as mechanical pushing elements and digital signal multi-level verification are adopted, so that detonation of explosives which is caused by misoperation can be effectively reduced. With the full-automatic seismic exploration digital signal remote detonation system and remote detonation method thereof of the invention adopted, the safety coefficient of construction personnel and the work efficiency of explosive sources can be improved, and high-precision synchronous control and digitization and miniaturization of equipment can be realize.

The invention provides an OFDM (orthogonal frequency division multiplexing)-based digital seismograph data transmission system and a synchronization method thereof, which are characterized in that the advanced OFDM technology is used as a transmission scheme in the transmission system. A transmitting terminal creates a training sequence based on conjugated symmetry of sequences, and then, overlays the training sequence on a complete OFDM; and a receiving terminal designs a simply structured synchronization algorithm based on the conjugated symmetry of training sequence to obtain a target function with single sharpness, and then, performs synchronous determination through a predetermined threshold so as to implement quick synchronization of the system. In comparison with the traditional overlaying period training sequence synchronization algorithm, the synchronization algorithm provided by the invention is low in computational complexity and quick in synchronization, can adapt to the digital seismograph data transmission system in high-rate transmission, and also can adapt to a wireless communication system using the OFDM technology.