Two-component pressure gradient receiver

FIELD: physics.

SUBSTANCE: sensitive elements composed by round transducers are arranged orthogonally one after another at the cylindrical case axis made of sound reflecting material and communicated with its surfaces via the hollow channels. Cross-section of the latter smoothly varies from round nearby sensitive element to rectangular nearby the case surface without decrease in cross-section area. Axes of said channels in appropriate sensitive elements are directed toward each other to make channels outlets be located in perpendicular planes relative to the case axis and to the point thereat located between the centres of both sensitive elements.

EFFECT: better protection against flowover noise, hence, decreased direction finding errors.

3 cl, 2 dwg

 



 

Same patents:

FIELD: physics.

SUBSTANCE: in seismic survey in icy water, streamers are towed behind a vessel under the water surface to avoid collision with ice. GPS readings may not be consistently obtained because the ice prevents a tail buoy with a GPS receiver from trailing from the streamer on the surface Instead, a device is towed on the streamer under the water surface. The absolute position of the streamer is tracked by intermittently bringing the towed device towards the surface so that GPS readings can be obtained. The absolute position of the streamer can then be used in conjunction with compass readings and can correlate various seismic sensor signals obtained along the streamer during the survey. The compass readings can be corrected for declination using declinometer readings, which can be compensated for iron effects from the vessel or other device carrying the declinometer.

EFFECT: high accuracy of survey data.

31 cl, 33 dwg

FIELD: physics; geophysics.

SUBSTANCE: invention relates to geophysics and can be used in seismic exploration to detect oil and gas deposits. The invention discloses a method and an apparatus for marine seismic survey using one or more movable marine seismic vibrators. The sweeping function for the vibrator is based on the criterion of allowable degradation and is a nonlinear function which performs frequency sweeping from top downwards. The obtained data can be used directly without cleaning or can be easily cleaned.

EFFECT: high accuracy of survey data.

21 cl, 11 dwg

FIELD: physics, geophysics.

SUBSTANCE: invention relates to geophysics and can be used for sea seismic works. Claimed are seismic streamer and related method of evaluation of the shape of seismic streamer controlled in transverse direction. This seismic streamer is divided into several adjacent sections of seismic streamer by control devices in transverse direction. Heading transducers arranged fore and aft of every section generate the data on heading. Every section is simulated as a rectangular fore and curved fore section. Section shape is evaluated in compliance with this model from the data on heading towards the section.

EFFECT: higher precision of trial data owing to precision of seismic streamer shape evaluation.

19 cl, 2 dwg

FIELD: physics.

SUBSTANCE: disclosed is a small-size bottom seismic module, connected by a hydroacoustic link to a control station and consisting of a sealed housing, a hydrophysical module, a device for detecting geophysical signals, which includes a bottom seismometer, information storage means, a spatial orientation sensor, a radio buoy, a ballast, a ballast release, a release timer, a flash beacon, a radio beacon, an external communication socket and a power supply. The sealed housing has the shape of a hemisphere which is linked to the base of the sealed housing which is in the form of a plate, on the upper diameter of which there are mechanical elements of the ballast release, which are in the form of straps which are linked to the ballast, tightly adjoining the base of the sealed housing on its lower diameter. The means of communicating with the control station are in the form of a single-relay hydroacoustic link. The spatial orientation sensor consists of an electronic 3D compass, three accelerometers and three angular velocity measuring devices, rigidly linked to the bottom seismometer, and the bottom seismometer is in the form of a wideband molecular-electronic sensor.

EFFECT: high reliability of detected seismic signals.

3 dwg

FIELD: physics.

SUBSTANCE: acoustic signal is emitted toward sea bottom. Signal of sound reradiation from water column is received. Gas flares are isolated from receive signal. Gas flare inclination is used to evaluate the stream velocity profile and direction. Density of gas flare sources on sea bottom and methane flow direction in water for every flare are calculated. Obtained data allows the determination of methane concentration in water column in the area of methane discharge.

EFFECT: higher efficiency and accuracy of evaluation.

1 dwg

FIELD: instrumentation.

SUBSTANCE: offered invention relates to measuring equipment and can be used for development and manufacture of oceanological multichannel information and measuring complexes and development of new measuring oceanological channels. The hydrological-optical-chemical complex contains a unit of hydrophysical measuring channels, a central controller, the first and second modems of the electric communication line, a conducting rope with electric and fibre-optical communication lines, a rotating electric transition, an electric winch, an operator workstation, a unit of optical measuring channels, and a unit of normalising controllers is added to it, and each hydrophysical measuring channel through the corresponding normalising controller is connected to the central controller, besides, the first and second multiport optical modems and the rotating optical transition are added, and each optical measuring channel is connected to the corresponding input of the first multiport optical modem connected through the fibre-optic communication line of the conducting rope to the rotating optical transition connected to the second multiport optical modem connected to the operator workstation. The information from the measuring channels of the hydrophysical module is processed by the normalising controllers, and in compact way by the central controller through the multiport modem is transferred to the onboard device of the probe, and also in creation of conditions for development, manufacture, laboratory and natural studies of new optical measuring channels for identification and registration of quantity of a mineral suspended matter and the weighed organic substance in sea water, integration of currently existing measuring oceanologic channels, creation of the combined channel of the electric and fibre-optical communication line between submersible and onboard devices.

EFFECT: integration in a single hydrological-optical-chemical complex of all available measuring channels of oceanological parameters.

1 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to hydroacoustic equipment and to the creation of deployment-retrieval devices (DRD) of flexible extended trailing antennas (FETA) on submarines and on surface ships. The invention proposes a DRD structure in which the deployment of the antenna to the stream in case some part of the antenna is wound on a winch, and its other part is arranged in a tubular storage unit, is provided by the creation of excess pressure in the tubular storage unit by means of a centrifugal pump, a sealing device on the end face of the tubular storage unit, which is close to the winch, is made in the form of a cylindrical module of the same inner diameter as the tubular storage unit, which is rigidly and tightly attached to it, and the suction pipeline of the centrifugal pump is made of two branch pipes, one of which is directed outboard and the other one is tightly attached to the inner volume of the tubular storage unit with an additional conical flange coaxial to the tubular storage unit and installed near its fore end face between the conical flange connected to the pressure pipeline and the sealing device of the fore end face of the tubular storage unit, the conical flange of the pressure pipeline is oriented with its constriction to the aft part of the tubular storage unit, and the conical flange of the suction pipeline is oriented with its constriction to the fore part.

EFFECT: increasing the safety of deployment and retrieval of flexible extended trailing antennas, some part of which is wound on a winch of deployment and retrieval devices, and some part is located in the tubular storage unit, without its damages or stops.

1 dwg

FIELD: measurement equipment.

SUBSTANCE: invention relates to devices for measurement of geophysical parameters in bottom area of seas and oceans. Substance: seismic module comprises a tight body (1), inside of which there is a hard disk drive (5), a unit (7) of a hydroacoustic communication channel, a ballast (2) breaker (8), a timer (9) of the breaker (8) of ballast (2), a flashing beacon (10), a joint (11) of external communication, a source of power supply (12), a hydrophysical module (13), a radio beacon (14), a seismic sensor (15), a unit (20) of spatial orientation. Besides, the unit (20) of spatial orientation comprises an electronic 3D compass, three accelerometers and three meters of angular speeds rigidly coupled with the seismic sensor (15). The seismic detector (15) is made in the form of a wideband molecular-electronic sensor. The tight body (1) is made in the form of a hemisphere with a base in the form of a plate, along the upper diameter of which there are mechanical elements of the ballast (2) breaker (8) installed. Mechanical elements of the ballast (2) breaker (8) are made in the form of slings (3), which are coupled to ballast (2) and tightly adjoin the base of the tight body (1) along its lower diameter. The hydroacoustic communication channel for connection of the seismic module with the dispatching station is made as single-relay.

EFFECT: increased validity of recorded data.

3 dwg

FIELD: transport.

SUBSTANCE: invention relates to ship building, particularly, to surface scientific and research vessels. Scientific and research icebreaking vessel is proposed for carrying out 3D seismic technology exploration irrespectively to ice conditions which vessel has a hull where seismic equipment is located, as well as a shaft for bay cable laying. To move source of acoustic waves untethered unmanned submersible is used which bases on a vessel and is dropped and lifted via separate vertical shaft using running - pulling tool.

EFFECT: improved operational performance of scientific and research vessel for seismic exploration.

3 cl, 1 dwg

FIELD: physics; geophysics.

SUBSTANCE: invention relates to geophysics and can be used in marine seismic prospecting. Disclosed is an underwater seismic recording system for reducing noise in seismic signals caused by reflected ghost waves or movement through the water. The system comprises two motion sensors. One sensor has a first response and sensitivity to noise caused by movement of the platform, as well as to acoustic waves. The second sensor has a different structure, which insulates the sensor from acoustic waves such that the response is primarily associated with noise caused by movement. Output data of the responses of the two sensors are combined to eliminate the effect of the noise caused by movement. Upon further combination with a hydrophone signal, noise caused by reflected ghost waves is reduced.

EFFECT: high accuracy of prospecting data.

14 cl, 19 dwg

FIELD: measurement equipment.

SUBSTANCE: device includes the first antenna 1, small-pressure barometer 2, the first ADC 3, the second ADC 4, the third ADC 5, the fourth ADC 6, the fifth ADC 7, personal computer (PC or a microprocessor) 8, unit of a common timing system (GPS or GLONASS) 9, subscriber coupling unit 10, the first amplifier 11, the first filter 12, the second amplifier 13, the first threshold unit 14, OR circuit 15, the second antenna 16, the third amplifier 17, the second filter 18, the fourth amplifier 19, the second threshold unit 20, the third antenna 21, the fifth amplifier 22, the third filter 23, the sixth amplifier 24, the third threshold unit 25, the seventh amplifier 26, the fourth filter 27, the eighth amplifier 28, the fifth filter 29, the fourth threshold unit 30, the first AND circuit 31, the first DAC 32, the first calibrator 33, the second DAC 34, the second calibrator 35, the third DAC 36, the third calibrator 36, the fourth DAC 37, the fourth calibrator 38, the fifth DAC 39, the first shaper 40, the sixth DAC 42, the second shaper 43, the first timer 44, the second AND circuit 45, the first counter 46, clock generator 47, the second timer 48, the first quad unit 49, adder 50, divider 51, the fifth threshold unit 52, the third AND circuit 53, the third timer 54, the fourth AND circuit 55, the second counter 56, the second quad unit 57, and the third quad unit 58.

EFFECT: possible use of a device at short distances in real time and increase of interference immunity of the device at available interfering signals.

1 dwg

FIELD: measurement equipment.

SUBSTANCE: device includes the first antenna 1, small-pressure barometer 2, the first ADC 3, the second ADC 4, the third ADC 5, the fourth ADC 6, the fifth ADC 7, personal computer 8, unit of a common timing system (GPS or GLONASS) 9, subscriber coupling unit 10, the first amplifier 11, the first filter 12, the second amplifier 13, the first threshold unit 14, OR circuit 15, the second antenna 16, the third amplifier 17, the second filter18, the fourth amplifier 19, the fourth amplifier 20, the third antenna 21, the fifth amplifier 22, the third filter 23, the sixth amplifier 24, the third threshold unit 25, the seventh amplifier 26, the fourth filter 27, the eighth amplifier 28, the fifth filter 29, the fourth threshold unit 30, the first AND circuit 31, the first DAC 32, the first calibrator 33, the second DAC 34, the second calibrator 35, the third DAC 36, the third calibrator 37, the fourth DAC 38, the fourth calibrator 39, the fifth DAC 40, the first shaper 41, the sixth DAC 42, the second shaper 43, the first timer 44, the second AND circuit 45, the first counter 46, clock generator 47, the second timer 48, the first quad unit 49, adder 50, the first divider 51, the fifth threshold unit 52, the third AND circuit 53, the third timer 54, the fourth AND circuit 55, the second counter 56, the second quad unit 57, the third quad unit 58, the second divider 59, corrector 60, the first module unit 61, subtracting unit 62, the second module unit 63, the sixth threshold unit 64, the fifth AND circuit 65, key 66, memory unit 67, the third module unit 68, the sixth AND circuit 69, univibrator 70, and sign comparison unit 71.

EFFECT: possible use of a device at short distances in real time scale and increase of interference immunity of the device at available interfering signals supplied from other azimuths.

1 dwg

FIELD: physics.

SUBSTANCE: device includes a radiating element, the investigated seismoacoustic transducer, a reference mirror, an optical photodetector, a laser and an optical prism with a semitransparent mirror placed at an angle of 45 to the base. The prism is placed between the radiating element and the investigated seismoacoustic transducer. The radiating and control elements used are a piezoceramic ring with which the optical photodetector is arranged concentrically. The reference mirror and the optical photodetector are acoustically decoupled with the radiating element and the prism.

EFFECT: high sensitivity and simple design of the device.

1 dwg

FIELD: measurement equipment.

SUBSTANCE: device for determination of a direction to a signal source, which includes in-series connected first magnetic antenna oriented in a north-south direction, and the first amplifier, in-series connected second magnetic antenna oriented in a west-east direction, and the second amplifier, in-series connected third antenna with a circular directivity pattern and the third amplifier, as well as the first, the second and the third analogue-to-digital converters (ADC), which are connected to a personal computer (PC or a microprocessor), which starts a control cycle of reception and processing of information when the specified value is exceeded by a signal from any of the above three antennas. At appearance of a useful signal, calculation of direction to the signal source is performed; in addition, it includes a common timing system unit (GPS or GLONASS) and a subscriber communication unit, which are connected to PC, in-series connected first commutator, second commutator, the first controlled filter and the fourth ADC, in-series connected third commutator, fourth commutator, the second controlled filter and the fifth ADC, in-series connected first digital-to-analogue converter (DAC) and the first calibrator, in-series connected second DAC and the second calibrator, in-series connected third DAC and the third calibrator, in-series connected fourth DAC and a shaper, as well as the third, the fourth and the fifth controlled filters connected with inputs to the first, the second and the third amplifiers respectively, and with outputs to the first, the second and the third ADC, the first and the second mixers, as well as a goniometer provided with the first and the second mutually perpendicular field windings arranged on the rotor connected to a digital drive and an encoder and connected to the first and the second amplifiers respectively, and with n fixed search windings arranged around the rotor and connected to the first and the third commutators. The first and the second mixers are connected with the first inputs to the third amplifier, with the second inputs to outputs of the first commutator and the third commutator respectively, and they are connected with their outputs to the second inputs of the second and the fourth commutators respectively, the first, the second and the third amplifiers are controlled as to a phase shift and amplification to control inputs connected to PC, control inputs of the controlled filters are connected to the shaper output, outputs of the first, the second and the third calibrators are connected to the first, the second and the third antennas respectively, and the rotor drive, the encoder, inputs of the first, the second, the third and the fourth DAC, outputs of the fourth and the fifth ADC and control inputs of the first, the second, the third and the fourth commutators are connected to PC.

EFFECT: possibility of frequency and spatial selection of signal sources.

1 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to technical security equipment and can be used to determine the azimuth to a detected object and distance to said object based on a seismic signal when securing extended areas, territories and accesses to different facilities. The apparatus comprises three seismic receivers, three delay lines, 2 n-correlators, two decision devices, an azimuth computer, a seismic wave velocity computer and a distance computer. To ensure unambiguous measurement of the azimuth of the detected object and to determine seismic wave velocity, the apparatus calculates two time delays, and the distance to the object is calculated based on a predetermined function.

EFFECT: high accuracy of determining the azimuth of a detected object and distance to said object.

4 dwg

FIELD: physics; geophysics.

SUBSTANCE: invention relates to geophysics and can be used in seismic exploration. The invention discloses a seismic exploration method, as well as an apparatus and a system for carrying out said method. The method includes receiving data on particle movement and rotational speed. Data on particle speed are used to obtain a wave field characteristic and data on rotational speed are intended for displaying a wave field gradient characteristic. The apparatus includes an arrangement of seismic sensor units which are configured to take measurements associated with seismic exploration carried out on a surface. Each seismic sensor unit includes a particle movement sensor and a rotation sensor. An image of the investigated geologic environment is constructed from the found values of the wave field characteristic and wave field gradient.

EFFECT: high accuracy of exploration data.

18 cl, 13 dwg

FIELD: physics; geophysics.

SUBSTANCE: invention relates to geophysics and can be used in seismic exploration. The seismic sensor module includes sensing elements arranged in a plurality of axes to detect seismic signals in a plurality of respective directions, and a processor to receive data from the sensing elements and to determine inclinations of the axes relative to a particular orientation. The determined inclinations are used to determine noise that has leaked into a seismic signal along the particular orientation due to seismic signals propagating in other orientations. The collected seismic data, taking into account the determined inclination, are rotated to transmit the signal along the target orientation without transmitting any other seismic signal in another orientation.

EFFECT: high accuracy of seismic data.

19 cl, 5 dwg

FIELD: radio engineering, communication.

SUBSTANCE: disclosed is a combined hydroacoustic receiver, having a housing, a sound pressure sensor and oscillatory acceleration sensors. The housing of the receiver is in form of a circular cross-section dumbbell which can be removable. In the end faces of the larger diameter there are channels for accommodating oscillatory acceleration sensors and a cylindrical sound pressure sensor is placed outside around the housing, between the end faces. The channels lie parallel to each other and perpendicular to the longitudinal axis of the housing or perpendicular to each other, and the oscillatory acceleration sensors are arranged such that their centres of mass lie on the longitudinal axis of symmetry of the housing.

EFFECT: high noise immunity of the receiver.

6 cl, 5 dwg

FIELD: physics.

SUBSTANCE: disclosed is a device in form of a cylindrical container with sockets in which seismic sensors are rigidly mounted. One of the sensors is vertical and its axis of maximum sensitivity is directed on the axis of the device. The other sensor is horizontal and its axis of maximum sensitivity lies in the clamping plane perpendicular to the longitudinal axis of the device. Two other horizontal sensors are also rigidly mounted in the container in a plane perpendicular to the longitudinal axis of the device at an angle of 45 degrees to the vertical clamping plane on both sides thereof.

EFFECT: high quality of detecting seismic vibrations in cased and uncased wells.

2 dwg

FIELD: physics.

SUBSTANCE: device includes a data collection unit (9) with a main power supply (10), an electronics unit (5) consisting of an analogue-to-digital converter (6), connected to a microprocessor (7), and a three-component accelerometer sensor (2) connected to the analogue-to-digital converter (6). The device is provided with a tiltmeter (3), a three-axis magnetometer (4) and a secondary power supply (8) installed in the electronics unit (5). The tiltmeter (3) and the three-axis magnetometer (4) are connected to the microprocessor (7). The three-component accelerometer sensor (2), the tiltmeter (3), the three-axis magnetometer (4) and the electronics unit (5) are connected to the secondary power supply (8) and are mounted in a waterproof casing (1) made from stainless steel.

EFFECT: high accuracy of measuring seismic vibrations.

1 dwg

FIELD: protection aids.

SUBSTANCE: direction finder can be used for taking azimuth relatively guarded objects at guarded areas, calculating number of objects in group target and classifying found objects. Direction finder has two seismic receivers, two processing channels with delay lines and correlators, maximal signal selector, correlator, testing module, commutator and calculator. To realize the direction finding function the method of passive diversity detection and ranging is used. The main information criterion for finding direction to object has to be the function of mutual signals correlation in two signal processing channels. Value of azimuth is judged from value of signal delay. Change in value of signal delay is equivalent to controlling directional diagram of seismic active aerial which allows classifying detected objects separately. Test influence is used for adaptation of speed of propagation of seismic wave which changes under influence of meteorological conditions. Current value of speed of propagation of seismic wave is judged from time of delay of test influence signal coming to second seismic receiver. Tuning of lines of delay is conducted correspondingly to those changes.

EFFECT: improved precision of direction finding.

2 dwg

Up!