RU41376U1 - CABLE-FREE DEVICE FOR SEISMIC DATA RECORDING - Google Patents

Abstract

1. A cordless device for recording seismic data, comprising a control unit and at least one seismic signal recorder, including a control logic unit, a storage device and a series pre-amplifier, an analog-to-digital converter (delta-sigma modulator) and a digital filter, characterized in that the seismic signal recorder further comprises a highly stable clock generator and an interface coordinator, the output of the digital filter is connected to control input of the control logic unit, the control output of which is connected via a bus to the control inputs of the amplifier, analog-to-digital converter, and a digital filter, the clock input of the control logic unit is connected to the output of a highly stable clock generator, and its first and second inputs and outputs of these buses are connected respectively to a storage device and with an interface coordinator, the other input-output of which is the input-output of the device, while the control unit is autonomous. 2. The wireless device for recording seismic data according to claim 1, characterized in that said autonomous control unit comprises a GPS receiver connected to a control computer, a test signal generator and an input / output port extender, the first and second inputs and outputs of which are connected respectively to the inputs the outputs of the control computer and the generator of the test signal, and the third inputs and outputs of the expander I / O ports are inputs and outputs of the unit.

Description

The utility model relates to the field of seismic exploration and can be used to detect and record seismic data, including the organization of seismic data acquisition systems.

A known seismograph containing a seismometer associated with an analog-to-digital converter and a calibrator of a calibration signal, a buffer memory unit connected to an information exchange line, to which an analog-to-digital converter is connected, a super-memory memory register, also connected to a logical unit, is an operative storage device, time unit terminal drive and control device (USSR copyright certificate No. 1041971, G 01 V1 / 24).

A seismic signal recorder is also known, comprising N geophones, N amplification units, an analog-to-digital converter, a control unit including an arithmetic-logical module, read-only memory, a buffer memory unit, a frequency driver, a time unit, a terminal amplifier, a gain control unit, a driver calibration signal. This cableless device for recording seismic signals operates in three modes: registration for the detection of seismic events, continuous registration mode, registration at predetermined times (RF patent No. 2205428, G 01 V 1/24). The operation of the device is carried out in accordance with the commands generated by the specified control unit combined with the registrar.

A disadvantage of the known devices is complexity, high cost. The objective of the utility model is to simplify the device for recording seismic data, while ensuring long-term, autonomous high-precision

seismic measurements with high performance and reliability, as well as cost reduction.

The problem is solved due to the fact that in a cableless device for recording seismic data containing a control unit and at least one seismic signal recorder, including a control logic unit, a storage device and a pre-amplifier connected in series, an analog-to-digital converter (delta-sigma modulator ) and a digital filter, according to a utility model, the seismic signal recorder additionally contains a highly stable clock generator and an inverter of the interface, the digital filter output is connected to the information input of the control logic unit, the control output of which is connected via bus to the control inputs of the amplifier, analog-to-digital converter and digital filter, the clock input of the control logic unit is connected to the output of the highly stable clock frequency generator, and its first and second inputs - the data outputs of the buses are connected respectively to the storage device and to the interface coordinator, the other input-output of which is the input-output of the device, while the unit ION made autonomous.

The problem is also solved by the fact that the specified stand-alone control unit contains a GPS receiver connected to the control computer, a test signal generator and an input / output port extender, the first and second inputs and outputs of which are associated with the inputs and outputs of the control computer and the test signal generator, and the third inputs / outputs of the I / O expander are block I / Os.

Figure 1 shows the structure of a cableless device for recording seismic data according to the utility model as a whole, including a block diagram of a control unit, figure 2 is a block diagram of a seismic signal recorder.

The cordless device for recording seismic data contains a standalone

the control unit 1 and n of the seismic signal recorders 2, at least one. The control unit 1 contains a GPS receiver 3 and a control computer 4, an input / output port extender 5, to which a test signal generator 6 is connected. The seismic signal recorder 2 contains a preamplifier 7, n-channel analog connected in series to seismic receivers (not shown) -digital converter 8, digital filter 9. The output of the digital filter 9 is connected to the information input of the control logic unit 10, the clock input of which is connected to the output of a highly stable clock generator 11. The control output of the control logic unit 10 is connected to the control inputs of the amplifier 7, the analog-to-digital converter 8 and the digital filter 9. The first and second inputs and outputs of the control logic unit 10 are connected by buses to the storage device 12 and interface coordinator 13, the other input is the output of which is the input-output of the device and through connector 14 is connected to the control unit 1.

The power supply of the control unit 1 and the recorder 2 is carried out from autonomous power sources (not shown).

Highly stable clock generator 11 can be performed on the chip of thermostatically controlled generator of the company "MORION" and provide frequency stability no worse than 10 ^-8 .

ADC 8 can be built on the CS5372 chip.

Random access memory 12 can be built on "Flash" - memory with a total volume of at least 1 GB, which is enough to ensure autonomy for up to several days of continuous monitoring.

The digital filter 9 can be performed on the CS5376 chip.

The control logic block 10 can be built on programmable logic chips of the Asex 1K or Cyclone series by Altera ..

As an interface coordinator 13, a USB adapter can be used

FT8U245BM, built on a single chip.

As the terminal connector 14 of the recorder 2 seismic signals can be used 16-pin connector SN-41B-16.

A wireless device for recording seismic data according to a utility model operates as follows.

The seismic signal recorders 2 are turned on in advance so that the internal highly stable thermostated generators 11 enter the operating mode. The operating mode of the recorder 2 is set by the commands coming through the interface coordinator 13 into the registers of the control logic unit 10. The storage device 12 is divided into two areas - data and service information. The service information area contains the setup data and the current parameters of the recorder 2, transmitted to it by the control unit 1. This area is filled in at the setup stage of the registrar 2. The data area of the storage device 12 is filled with data during offline operation (registration mode).

At the stage of monitoring and tuning, the seismic signal recorders 2 are connected via connector 14 through the I / O expander 5 to the control unit 1, which, using the test signal generator 6, monitors and adjusts the parameters of the seismic signal recorders 2. For this, the test generator b feeds analog inputs of recorders 2 reference signals. Seismic recorders 2 receive, amplify, digitize, filter, and also transmit through the I / O port extender 5 the observation data of the test signals to the control computer 4. The control computer 4 receives and processes these digital data and calculates real gain coefficients based on them, instant dynamic range, maximum undistorted signal level, non-linear distortion coefficient, etc., i.e. metrological parameters of analog channels of seismic signal recorders 2. Control unit 1 also checks for completeness

and the correct functioning of the registrars 2 and rejects them. Simultaneously with the indicated procedures, the control unit 1 controls the possible temporary departure of the stable generators 11 of the registrars 2, Next, the control unit 1 programs the registrars 2, i.e. sets the registration parameters, the number of working channels, the gain of the amplifier 7, the quantization frequency of the ADC 8, the serial number of the recorder, etc., for which the required value of the control signals is recorded in the internal registers of the control logic block 10. Then, the registrars 2 are taken offline and installed on the ground in accordance with a predetermined research program, with mandatory recording in the storage device 12 of the time to go offline, the number of the picket, the coordinates of the installation point and other data. From this moment, registrars 2 work completely offline.

All seismic signals recorded by seismic receivers (not shown) are sent in analog form through an amplifier 7 to the input of the ADC 8 of each of their registrars 2. The bitstream of the ADC 8 is processed by a filter 9, which generates multi-bit data reports with a given quantization frequency. The control logic unit 10 directs the data stream directly to the storage device 12.

In this mode, the recorders 2 operate continuously until one of the possible events occurs: battery discharge, filling of the storage device 12 or an external command from the control device 1. The reason for the stop is always recorded in the storage device 12 and can be read. The time interval for filling the memory of the storage device 12 may be from several hours to several days, depending on the quantization frequency of the ADC 8.

At the same time, sources of seismic vibrations (explosions, vibrators, pulsed sources, etc.) operate according to a free schedule. At the same time, during the entire period of registration, a schedule for the onset of exposure and its duration is formed and stored (work log). Journal of work on communication lines, on carriers or

manually entered into the control computer 4 of the control unit 1.

Upon completion of the observations, the recorders 2 are assembled and connected to the control unit 1 through the expander of the input / output port 5. The control unit 1 reads the seismic information from the storage device 12, both as a continuous array indicating the time of its formation and by fragments of the array in accordance with the log work. Reading data from the storage device 12 is carried out under the control of the control logic 10 through the interface coordinator 13. Based on the known absolute time of the beginning of the session, the time when the recorder 2 is taken offline, the quantization period and the temporary departure of the generator 11, the control computer 4 calculates the memory area of the storage device 14, containing information for the desired observation session. All the data necessary for calculating the memory addresses are read from the service information area of the storage device 12. These data always allow you to correlate seismic data, the absolute time and coordinates of each of the recorder 2 for further use. Reading memory in fragments saves time and improves performance.

From point observations in the future, multichannel seismograms can be formed, stored and processed.

In addition, the control unit 1 tests the performance of registrars 2 at the time of completion of registration and in case of violations in its logic, the read data of the registrar is marked as invalid.

The cordless device for recording seismic data, according to the utility model, when used provides the following features and advantages during seismic operations:

- ensuring long-term and reliable work in the autonomous mode of registrars and the absence of cable management (seismic streamers) makes it possible to use

devices in a wide range of geophysical works, including for regional, prospecting, exploration, engineering and scientific geophysics, for performing seismic monitoring without time limits and solving seismology problems;

- the possibility of a free mode of operation of sources of seismic vibrations and the absence of the need to harmonize observation equipment with any sources of oscillations;

- almost unlimited number of observation points;

- the ability to organize continuous monitoring without time limits;

- the ability to work in particularly difficult operating conditions.

Claims (2)

1. A cordless device for recording seismic data, comprising a control unit and at least one seismic signal recorder, including a control logic unit, a storage device and a series pre-amplifier, an analog-to-digital converter (delta-sigma modulator) and a digital filter, characterized in that the seismic signal recorder further comprises a highly stable clock generator and an interface coordinator, the output of the digital filter is connected to control input of the control logic unit, the control output of which is connected to the control inputs of the amplifier, analog-to-digital converter and digital filter by a bus, the clock input of the control logic unit is connected to the output of a highly stable clock generator, and its first and second inputs and outputs of these buses are connected respectively to a storage device and with an interface coordinator, the other input-output of which is the input-output of the device, while the control unit is autonomous. 2. The cableless device for recording seismic data according to claim 1, characterized in that said autonomous control unit comprises a GPS receiver connected to a control computer, a test signal generator and an input / output port extender, the first and second inputs and outputs of which are associated with inputs and outputs of the control computer and the generator of the test signal, and the third inputs and outputs of the expander I / O ports are inputs and outputs of the unit.