261 results about "Infrasonic waves" patented technology

The invention provides a pipeline blockage positioning method and device, and mainly solves the problems that artificial pipeline blockage detection is difficult and the efficiency is low. The pipeline blockage positioning method is characterized by comprising steps as follows: a detection device consisting of a core control panel, a compressed air pump, a infrasonic wave sensor, a pressure sensor, a temperature sensor, an electromagnetic valve for controlling release of sonic waves, a nozzle valve, an exhaust valve and a connecting pipeline is mounted on a to-be-detected pipeline, and acquires the time difference delta t between the occurrence and echo of an infrasonic wave through an infrasonic wave collection module; after a pipeline blockage positioning calculation module acquires pressure and temperature in the pipeline, a sound velocity calculation module calculates the propagation velocity c of the infrasonic wave in the pipeline, the passing path of the infrasonic wave is shown as follows: L=c*delta t, and the distance between the pipeline blockage position and a pipe orifice is as follows: s=L/2. The blockage position can be accurately positioned with the method, and the detection efficiency is effectively improved.

The invention discloses an oil pipeline leakage detection and positioning system, which is mainly and technically characterized in that the system comprises a data acquisition module, a signal conditioning module, a data processing and analysis module, a sound-light alarm module, a display module, a GPS (Global Positioning System) module, a GSM (Global System for Mobile Communications) module, a GPRS (General Packet Radio Service) network and a monitoring center, the data acquisition module comprises a pressure transmitter, an infrasonic wave sensor and a flowmeter, the signal conditioning module comprises a current/voltage conversion module, a counting module and an analog filter module, the data processing and analysis module comprises a controller, the data acquisition module is connected with the signal conditioning module, the signal conditioning module is connected with the data processing and analysis module, the sound-light alarm module, the display module, the GPS module and the GSM module are connected with the data processing and analysis module, and the GSM module is connected with the monitoring center through the GPRS network. The oil pipeline leakage detection and positioning system has the advantages that the leakage detection sensitivity is high, the real-time performance is strong, the positioning accuracy is high and the cable resources are greatly saved.

The invention relates to a leakage monitoring system, method and device for a pipeline and a server. The method includes the steps that infrasonic signal, pressure, temperature and flow data in the pipeline are obtained; infrasonic leakage detection is performed according to an infrasonic signal so that the leakage state and the leakage occurrence time of the pipeline can be obtained; negative pressure wave leakage detection is performed according the pressure and temperature data so that the leakage state and the leakage occurrence time of the pipeline can be obtained; flow balance leakage detection is performed according to the flow data so that the leakage state of the pipeline can be obtained; the leakage occurrence time obtained according to infrasonic leakage detection and/or leakage occurrence time obtained according to negative pressure wave leakage detection are/is output to the server. The leakage monitoring device integrating the three leakage monitoring methods achieved through infrasonic waves, negative pressure waves and flow balance can achieve the effects that the methods are complementary, the leakage alarming rate is increased, and the error alarming rate and the missing alarming rate are reduced.

The invention relates to an automatic infrasonic wave non-pressure oil well liquid level monitoring instrument. A gas storage chamber, a gas chamber pressure sensor, a gas emission device, an infrasonic wave receiving and processing device and a gas-collecting device are arranged in a shell of the monitoring instrument; the gas chamber pressure sensor is connected with the gas storage chamber; the monitoring instrument is also provided with a gas generation device; a gas inlet of the gas generation device is connected with the gas-collecting device through a pipeline; and a gas outlet of the gas generation device is connected with the gas storage chamber through a pipeline. The automatic infrasonic wave non-pressure oil well liquid level monitoring instrument extracts gas from an oil well sleeve, and pressurizes and injects the gas into the gas storage chamber to generate an infrasonic wave pulse required by the measured liquid level; and gunpowder sound bombs or nitrogen cylinders are replaced, so that the automatic infrasonic wave non-pressure oil well liquid level monitoring instrument can work on the non-pressure oil well for a long time automatically, continuously and stably.

The invention relates to a mud-rock flow monitoring and alarming system based on an infrasonic wave. The mud-rock flow monitoring and alarming system comprises an infrasonic sensor, a signal processing circuit, a data acquisition card and a computer. The infrasonic sensor is used for acquiring mud-rock flow infrasonic signals. The signal processing circuit is used for amplifying and filtering the mud-rock flow infrasonic signal. The signal acquisition card performs analog-to-digital conversion on the mud-rock flow infrasonic signal after signal processing and transmits the converted result to the computer. The computer utilizes an HHT method for performing time-frequency domain analysis on the signal and calculates out the power spectrum of the signal, thereby obtaining signal energy and furthermore determining a mud-rock flow disaster. The mud-rock flow monitoring and alarming system can perform real-time monitoring on occurrence of the mud-rock flow disaster and furthermore can perform alarming.

The invention relates to a low-frequency sound wave generation technology and provides a method and a device for generating a low-frequency sound wave. The low-frequency sound wave is obtained in the manner that a high-frequency electric signal is modulated by using a low-frequency electric signal. A modulating way can be a frequency modulation way, an amplitude modulation way or a phase modulation way and the like. An obtained modulating signal is converted by an energy converter, and thus, a sound wave signal with certain frequency spectrum content can be output, and can be low to an infrasonic wave band. The method for generating the low-frequency sound wave provided by the invention is simple. The device is small in size and low in manufacturing cost. The method and the device for generating the low-frequency sound wave are suitable for low-frequency sound wave research in laboratories and medical science.

The invention discloses a method and a system for positioning coal rock dynamic disaster through infrasonic wave monitoring. The system comprises a monitoring main station and a plurality of monitoring substations, and the monitoring substations are connected with the monitoring main station through a fiber optic network; each monitoring substation is composed of three infrasonic wave sensors arranged in a triangular form, and the infrasonic wave sensors are connected with an infrasonic wave monitor; and the monitoring main station is provided with a computing server. The positioning method isthat the main station computing server filters collected data, the time-frequency analysis is performed on the data by the short-time Fourier transform (STFT), the frequency energy density is compared, signals of the main frequency band are extracted, and the calculation result is positioned through statistical analysis and time delay estimation theory. The system monitors the infrasonic wave signal generated by the fracture of the loaded coal rock. Through this method, the non-contact and regional tests are carried out on the stress distribution state of the surrounding rock of the tunnel ormines to determine the area of coal rock fracture and stress anomaly. The method is simple in installation and operation, has little impact on production, and has a large detection range and a long detection distance.

The invention discloses a method for preparing a piezoelectric polymer functional film with an ordered micro-cellular structure by using a template, and relates to a preparation technique of the piezoelectric polymer functional film with the ordered micro-cellular structure. The method firstly prepares a template (4) with a concave-convex ordered pattern, then prepares an ordered porous polymer single-layer thin film (2) which shows a pattern corresponding to the concave-convex ordered pattern of the template (4), then clamps the ordered porous polymer single-layer thin film (2) between two dense films, and carries out hot-pressing to form the piezoelectric polymer functional film with the ordered micropore structure. The method has simple technique, not only can obtain an electromechanical functional film with high thermostability and high pressure flexibility, and has more outstanding advantages of the capability of precisely controlling the microstructure of the film and electric charge of the storing space. The obtained functional film can be used for manufacturing electroacoustic sensors, acoustoelectric sensors, infrasonic wave sensors, ultrasonic sensors, plate loudspeakers, actuators and robot skin and the like, and has wide application prospect in the fields of communication, public security, control, medical treatment, robots, military and the like.

The invention relates to a distributed optical fiber multi-parameter pipeline leakage positioning and warning system and a leakage positioning method. The distributed optical fiber multi-parameter pipeline leakage positioning and warning system comprises a sensing optical fiber laid in the same ditch as a pipeline and a DTS system connected with the sensing optical fiber. At least two negative-pressure wave monitoring devices are arranged on the pipeline. A negative-pressure wave monitoring system and the DTS system are both connected with a monitoring center through communication interfaces and the Ethernet network. Each negative-pressure wave monitoring device comprises a pressure flow transmitter connected with the pipeline, and the pressure flow transmitter is connected with a data acquisition unit. The data acquisition units are connected with GPS timing antennas. The distributed optical fiber multi-parameter pipeline leakage positioning and warning system has the beneficial effects that the defects that a negative-pressure wave monitoring and infrasonic wave leakage monitoring system cannot conduct monitoring and cannot conduct accurate positioning due to small leakage and adistributed optical fiber temperature leakage monitoring system cannot monitor leakage due to a low-temperature difference are overcome; based on the temperatures, obtained by a distributed optical fiber temperature measuring system, of all points, the wave velocity is calculated and corrected accurately, and accurate positioning of the leakage position is achieved.

The invention provides a mobile phone that is controlled by infrasonic wave. The mobile phone includes a receiving cell, an analysis cell, a processing cell, an operation cell and a control cell. The receiving cell is used for receiving the infrasonic wave. The analysis cell is used for transmitting the received infrasonic wave signal into an electrical signal and sending to the processing cell. The processing cell is used for transmitting the electrical signal into a data signal. The operation cell is used for transmitting the data signal into an operation indication for operating the mobile phone, and processing various operation to the mobile phone operation system. The control cell is used for controlling the operation indication corresponding to various infrasonic wave. The invention also includes a method for operating the mobile phone through infrasonic wave. The infrasonic wave has strong anti-damping characteristic and penetration characteristic, even certain distance exists between the user and the mobile phone, the infrasonic wave also is convenient to remote control the mobile phone without interference which provides convenient to user.

A comprehensive oil and gas pipeline leakage monitoring system mainly comprises infrasonic wave sensors, an acoustics monitoring terminal, a clock server and a leakage monitoring server; two infrasonic wave sensors are mounted at each of an upstream detecting point and a downstream detecting point of a pipeline that needs monitoring; an infrasonic wave signal is generated when the pipeline leaks; whether leakage occurs or not can be judged through comparing the infrasonic wave signal with normal background noise; the infrasonic wave sensors preprocess and amplify the collected infrasonic wave signal generated due to leakage of the pipeline, convert the collected infrasonic wave signal into a multichannel sound wave signal of the numeric field, and transmit the multichannel sound wave signal to a signal acquisition and analysis system; and the signal acquisition and analysis system determines the leakage position according to the difference of time when the infrasonic wave signal reaches the upstream detecting point and the downstream detecting point and the propagation velocity data of a sound wave in a fluid. The comprehensive oil and gas pipeline leakage monitoring system adopts the clock server to solve the time synchronization problem of upstream monitoring equipment and downstream monitoring equipment and provides time marks for all data.

The invention relates to a single station infrasonic wave signal recognition and extraction method, which comprises the steps that a single infrasonic sound monitoring station receives infrasonic wave signals; abnormality recognition is performed on the received infrasonic wave signals based on four elements such as the energy flow peak, the zero-crossing rate, the wind speed and noise and wavelet time-frequency characteristics so as to find out a time period in which an abnormal moment is distributed, thereby acquiring four groups of time period sequences; comparative analysis is performed on the four groups of time period sequences to find out overlapped time periods in the four groups of time period sequences, the overlapped time period sequence is marked on the waveform of the infrasonic wave signals so as to be used for indicating the waveform and the location of valid event suspected signals, and then further recognition and classification are performed on the valid event suspected signals by using valid event historical signal characteristics, so that the type or the source of the infrasonic wave signals is judged.

The present invention belongs to the household daily necessary electronic product, in particular to an electronic pest-driving system driving the pests such as the rat and cockroach with a physic method. The electronic pest-driving device on the prior market has poor driving effect, which results in the certain adaptation of the pests such as the rat and the cockroach in the long-term application process. Based on the working principle of the prior electronic pest-driving device, the present invention proposes to adopt the single chip insertion-typed technology and the real-time clock chip and frequency-conversion technology to realize the digital electronic technology so as to produce the extremely-low-frequency electromagnetic wave, ultrasonic wave and the infrasonic wave having different frequencies and having no harm for the human body to drive the pests such as the rat and the cockroach. Through controlling the clock chip, the present invention produces the electromagnetic wave, the ultrasonic wave and the infrasonic wave in other frequent band after the system works for a period of time, thereby effectively resolving the problems of the prior electronic pest-driving device that the frequent point is limit and the effect is reduced due to the adaptation of the animal after the system is used for a period of time.

Exemplary practice of the present invention provides an air vehicle and at least one interferometric double-path fiber optic sensor connected with the air vehicle. Each fiber optic sensor includes a pair of optical fibers, viz., an optical sensing fiber and an optical reference fiber, in a parallel and propinquus relationship. The paired optical fibers of each fiber optic sensor are attached to the air vehicle either (i) circumferentially around the fuselage or (ii) lengthwise along the fuselage or (iii) span-wise along the wings and across the fuselage, and are configured whereby the sensing fiber is exposed to the atmosphere and the reference fiber is not. Each fiber optic sensor senses atmospheric infrasound but does not sense atmospheric wind noise, which is negated by incoherency associated with design lengthiness of the optical fiber pair. Noise and strain due to temperature, vibration, and propulsion are neutralized via interferometric common mode rejection.

The invention relates to an infrasonic wave detection device which comprises a laser device and a vibrating diaphragm single-slit device, wherein the laser device is used for generating a laser beam; the vibrating diaphragm single-slit device comprises two cutter blades and a sensitive diaphragm; the two cutter blades are arranged on the same plane and separated from each other to form a single slit; one of the cutter blades is arranged in the deformation region of the sensitive diaphragm; the sensitive diaphragm is arranged in the infrasonic wave region; and the laser beam passes through the single slit and generates single slit diffraction fringes. The infrasonic wave enables the sensitive diaphragm to generate vibration, so that the cutter blades slightly vibrate to change the width of the single slit and further enable the single slit diffraction fringes to change. By detecting the infrasonic waves with the single slit diffraction fringes of the laser beam, the infrasonic wave detection device has the advantages of simple overall structure, low requirements for working accuracy of devices, low manufacturing cost and easy realization.

The invention discloses a fully automatic in-pipe fluid leakage online supervision and locating system and method. The system comprises a main station system and two or more than two substation systems. Each substation system comprises an infrasonic wave sensor, a pressure transducer, a flow meter, a valve, an external power supply and a digitizer. The in-pipe sound wave levels are assessed to automatically select the infrasonic wave method and (or) the transient model method to conduct leakage alarm and locate leakage points. Compared with the prior art of supervision and locating system, the fluid leakage online supervision and locating system has a higher locating precision, higher accuracy and a higher work condition adaptability.

An infrasound testing device consists of an infrasound sensor, a lowpass, an analog-digital converter, an SCM and an LCD which are respectively connected with a battery, wherein, the output end of the infrasound sensor is connected with the input end of the lowpass, the output end of the lowpass is connected with the input end of the analog-digital converter, the output end of the analog-digital converter is connected with the input end of the SCM, and the output end of the SCM is connected with the LCD. An amplitude modulation principle is utilized to measure the slow changes of a capacitance microphone, an acoustic compliant element in the infrasound sensor acts as an arm of the capacitance bridge, the input end is connected with a high-frequency voltage with same amplitude, when the infrasound wave acts on the film, the film generates a displacement with the change of the sound pressure, which result in the capacitance changes of the plate capacitor, so that the balance of the capacitance bridge is changed, therefore, the output end can obtain amplitude modulation wave modulated by the capacitance change, the amplitude modulation wave is sent to a modern after the voltage is amplified, then the low-frequency electrical signals are gained, and the detection of the infrasound wave is achieved.

The invention discloses an infrasonic wave generator for testing the liquid level of an oil well, which comprises an inner air cylinder assembly, an outer air cylinder assembly, an upper end cover and an air compression device, wherein a guide frame and an outlet drain plug are arranged between the inner air cylinder assembly and the outer air cylinder assembly; the inner air cylinder assembly comprises an air cylinder sleeve; the outer air cylinder assembly comprises an outer air cylinder; the upper end cover is connected to the outside of the outer air cylinder assembly and is provided withan air hole; one end of the inner air cylinder assembly is provided with an upper drain plug, and the other end of the inner air cylinder assembly is also provided with an air hole; the air compression device comprises a pull rod; one end of the pull rod is provided with a piston; the piston is used for sealing the air cylinder sleeve in the inner air cylinder assembly; a compression spring is arranged at the periphery of the pull rod; the piston is elastically connected with the inner side of the outer air cylinder assembly through the compression spring; and the other end of the pull rod isprovided with a handle. In the invention, sound is produced in an air compression mode, and the generator has the advantages of saving the costs of sound bombs and nitrogen and preventing potential safety hazards caused by the explosion of gunpowder in the sound bombs and is environmentally friendly, economical and pollution-free.

The invention discloses a sensitivity enhancement type optical fiber acoustic sensor probe and a sensitivity enhancement structure thereof. The sensitivity enhancement structure comprises a first shell, a first diaphragm and a second diaphragm, wherein the first shell is provided with a first port and a second port, and the size of the first port is greater than the size of the second port; the first diaphragm is tightened and arranged on the first port; the second diagram is tightened and arranged on the second port and is provided with a reflection surface, the central zone of the reflectionsurface and the end surface of an optical fiber are opposite, a gap is formed, and the deformation resistance ability of the second diaphragm is smaller than the deformation resistance ability of thefirst diaphragm; and a vibration transmission cavity is jointly formed by the first shell, the first diagram and the second diagram, the first diagram generates vibration through an induction sound signal, and the vibration is transferred to the second diagram through the vibration transmission cavity to cause gap changes so as to modulate an optical signal transferred by the optical fiber. By use of the sensitivity enhancement structure, probe sensitivity can be effectively enhanced, the signal-to-noise ratio of the probe is improved, and the sensitivity enhancement structure is especially suitable for the high-sensitivity low-noise detection of infrasonic wave.

The invention belongs to the field of biomedical engineering, and relates to a method and device for relieving fatigue through infrasonic waves. The method for relieving the fatigue includes the step that the infrasonic waves are used for inducing brain waves so as to make the brain enter a deep sleep state fast, and at the moment, the brain waves are delta rhythm waves, so that the brain blood oxygen of a person is supplemented, the tension state of the human body is relaxed, physical strength is recovered, and the fatigue is relieved. The device for relieving the fatigue comprises a compartment cover, a control system, a hydraulic system, a power amplifier, guide rails, a bed body, a loudspeaker, a control panel, a lighting system, a compartment body and the like, the totally closed, full automation and noiseless design is adopted, multiple inputting modes are built in infrasonic wave inputting signals, and the device is suitable for people at all ages with different needs. The method for relieving the fatigue is good in effect, free of sequelae and suitable for most groups, and the device is simple in structure, stable, safe, comfortable and reliable.

Provided is a method for measuring the dynamic liquid surface of an oil well with a frequency difference infrasonic wave generator. The method for measuring the dynamic liquid surface of the oil well with the frequency difference infrasonic wave generator comprises the following steps of (1) pre-installing echo machines at the inner side of each casing coupling and the outer side of each tubing coupling respectively; (2) installing the frequency difference infrasonic wave generator above the mouth of the oil well, and enabling the frequency difference infrasonic wave generator to be connected to a control unit which is connected with a microphone at the mouth of the oil well and an upper computer and an oscilloscope at a remote end respectively; (3) sending a signal to the control unit through the upper computer, transmitting a generated infrasonic wave to the downhole, then receiving reflected waves returned by a downhole echo machine and the dynamic liquid surface through the microphone at the mouth of the oil well, and then converting the reflected waves into electric signals so as to display the electric signals on the oscilloscope; (4) transmitting the electric signals to an AD sampling chip, obtaining the height of the dynamic liquid surface through calculation with the chip, and sending results to the upper computer. The method for measuring the dynamic liquid surface of the oil well with the frequency difference infrasonic wave generator has the advantages of being high in safety, low in operation cost and construction intensity, controllable in process, small in measurement error and capable of achieving real-time, continuous, remote and unmanned monitoring of the dynamic liquid surface of the oil well.