SU1723545A1 - Device for control of seismic wave source - Google Patents

Abstract

The invention relates to seismic exploration and is intended for use in control systems for unipolar pulsed seismic wave sources. The purpose of the invention is to expand the field of application of the device. The device contains an additional sequence switching node, which allows both to generate single additional sequences and automatically switch the sequences by applying the next command signal by generating control signals in the switching node, generated by the counter and received through the electronic keys of the switching node on the device's electronic key elements source control of seismic waves and additional inputs of control circuits information (evenness and oddness). 1 hp f-ly, 2 ill.

Description

The invention relates to seismic exploration and seismology, namely to control systems for unipolar pulsed seismic wave sources.

A source control device for seismic waves is known, which contains a source of command pulses (seismic station), electronic switches, a constant frequency generator, a coincidence circuit, an actuator, a seismic moment generation unit, and a unit for setting a given number. The device allows you to synchronize several sources that have different technological constant triggers.

A disadvantage of this device is also the impossibility of obtaining command signals programmatically varying according to a given law.

The closest in technical essence is a seismic source control device, which contains a source of command pulses, an electronic key, a constant frequency generator and a pulse counter connected through the first input of the electronic key in series, the executive body of the seismic wave generator, the output of which is connected to the first input excitation control unit, the output of which is connected to the second input of the electronic key, code VJ

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a torus whose inputs are bitwise connected to the outputs of the pulse counter, a control unit for information (parity and oddness), whose inputs are bitwise connected to the outputs of the encoder, and the output to the input of the actuator of the seismic generator and the second input of the excitation control unit, the additional output of the counter pulses connected to the third input of the electronic key.

A disadvantage of the known control device is the limited functionality due to the fact that the device does not have the ability to quickly switch automatically generated additional sequences according to the required law, which reduces the performance of seismic exploration and reduces the scope of application.

The purpose of the invention is to expand the field of application of the device.

The goal is achieved by the fact that a seismic source control device containing a source of command pulses, an electronic key, a constant frequency generator and a pulse counter connected in series through the first input of the electronic key in series, the executive body of the seismic wave generator, the output of which is connected to the first input of the excitation control unit, the output of which is connected to the second input of the electronic key, the encoder, the inputs of which are connected in series to the outputs of the counter and pulses, information monitoring unit, whose inputs are bitwise connected to the encoder's outputs, and the output to the input of the executive body of the seismic wave generator and the second input of the excitation control unit, while the additional output of the pulse counter is connected to the third input of the electronic key, according to the invention, a node is entered switching additional sequences, the first input of which is connected to the additional output of the pulse counter, and the second input - to the second output of the electronic key and the third input of the account pulses, the second input of which is connected to the third output of the electronic key, the third input of which is connected to the first output, and the fourth input to the second output of the additional sequence switching node, the third and fourth outputs of which are connected to the second and third additional input of the unit control information, the fourth additional entrance

which is connected to the output of a constant frequency generator.

An additional sequence switching node includes a switch, first and second encoders, four electronic keys, an inverter, an AND circuit, a position counter and a driver, the switch outputs being connected to the inputs of the first encoder, the first four outputs of which are connected to the first inputs of four electronic keys, respectively, and the output is with the input of the inverter and the output of the fourth electronic key, the combined outputs of the first, second and third electronic keys form the first output A node of the switch of additional sequences, the first input of which is formed by connecting the input of the driver and the first input of the circuit I, the second input of which is connected to the sixth output of the first encoder, the output of the driver is connected to the second input of the first electronic key and the counting input of the position counter additional sequences, the outputs of the position counter are connected respectively to the inputs of the second encoder, the outputs of which are connected respectively the second inputs of the second, third and fourth electronic switches and the AND circuit whose output is a fourth output node switch complementary sequences whose third output is the output of inverter and the second input - input setting position counter.

Figure 1 shows a block diagram of a device for controlling a source of seismic waves; Fig. 2 is a block diagram of the switching node of additional sequences.

The device contains a source of command pulses 1, an electronic switch 2, a constant frequency generator 3, a pulse counter 4, an encoder 5, an information control unit (parity and oddness) b, an actuator 7 of the seismic wave generator, an excitation control block 8, switching node 9 I ate food

At that, the source 1 of command pulses, electronic key 2, generator 3 of constant frequency and counter 4 pulses are connected in series through the first input of electronic key in series, the outputs of counter 4 pulses through encoder 5 representing a group of (p-1) two-input elements And -NOT (I), where n is the number of bits of the counter, are connected bit by bit with

the inputs of the information control unit (parity) 6, the output of which is connected via the executive body 7 of the seismic wave generator to the first input of the excitation control unit 8 and directly to the second input of the same unit, the output of which is connected to the second input of the electronic switch 2, the third input to which the first output of the node 9 switching additional sequences. The first input of the node 9 is connected to an additional output of the counter 4, and the second output of the node 9 is connected to the fourth input of the electronic key 2 and the second input (reset) of the counter 4. The second output of the electronic key 2 is connected to the third input (reset) of the counter 4 and the second input of the node 9 switchings of additional sequences, the third and fourth outputs of which are connected to the corresponding additional second and third inputs of the parity check circuit 6, the additional fourth clock input of which is connected to the output of a constant generator frequency 3.

The capacitance of the counter 4 pulses, the encoder 5 and the parity check and oddness scheme b is selected for the maximum necessary number of pulses in the sequences.

The connection of the outputs of the counter 4 to the encoder 5 is made as follows. The first and second bits of the pulse counter 4 are connected to the inputs of the first element AND-NOT of the encoder 5, the second and third bits of the counter 4, and so on to the inputs of the second element AND – E E. The inputs of the (n-1) -th element AND-NOT connected (n-1) -th and n-1 bits of the counter 4.

The switching unit 9 of the additional sequences comprises a switch 10, a first encoder 11, electronic keys 12-15, an inverter 16, an AND circuit 17, a position counter 18, a driver 19 and a second encoder 20.

The outputs of the switch 10 are connected to the inputs of the first encoder 11, the first four outputs of which are connected to the control inputs of the electronic switches 12-15, and the fifth is connected to the input of the inverter 16, the outputs of the electronic switches of the first 12, second 13, third 14 are combined and are the first output of the additional sequence switching unit 9, the first input of which is connected to the first input of the AND circuit 17 and the input of the former 19, the output of which is connected to the signal second input of the electronic switch 12, the clock input of the counter 18 and the second output node are switching complementary sequences.

The zero and second outputs of the counter 18 are connected via the second encoder 20 to the second signal input of the electronic switch 15, the output of which is connected to the input of the inverter 16, the output of which is the third output of the switching section of the additional sequences. The second and third outputs of the position counter 18 through the second encoder 20 are connected to the sixth

0 by the output of the first encoder 11 and with the second input of the circuit AND 17, the output of which is the fourth output of the switching node of the additional sequences. The second output of the position counter 18

5 is additionally connected to the second signal input of the electronic switch 13, and the fourth output to the second signal input of the switch 14. The installation input of the counter 18 is the second input of the node

0 9 switch extra sequences.

Shaper 19 is designed to form a reset pulse from the trailing edge of the output pulse of counter 4.

5 The first encoder 11 is intended for

converting the signals arriving at its input into a code pattern at its outputs. The electronic key 2 consists of two triggers, the inputs S of the installation in the single state of which are combined and are the first input of the electronic key 2, the first inputs of the installation in the zero state of the triggers are combined and are the second input of the electronic key 2, the second

5, the zero-state setup input of the first trigger is the fourth input of the electronic key, the third input of which is connected to the second setup input to the zero state of the second trigger, the output of which

0 is the second output of the electronic key, the first output of which is the output of the first trigger.

The device works as follows.

5 In the initial state, the two triggers of the electronic key 2 are in the zero state and with their output signals the counter 4 is set to the zero state, the position counter 18 of the additional sequence switching node 18, and the constant frequency generator 3 does not generate clock pulses.

The command impulse from source 1 (seismic station) at the beginning of the formation of each

5 of the additional pulse sequences include electronic key 2 triggers. The signal from the output of the first trigger includes a constant frequency generator 3, which produces clock pulses fed to a binary pulse counter 4. The signal from the second trigger removes the inhibiting of counting from the binary counter 4 and the position counter 18 switching nodes of additional sequences 9.

The pulse frequency of the generator 3 must not exceed the maximum pulse frequency that the seismic source can operate with.

During the counting of pulses by the counter 4, its bit outputs provide information to the encoder 5. Information from the outputs of the encoder 5 is fed to the information inputs of the parity 6 and odd parity checker 6, the additional second and third inputs of which receive signals from the inverter 16 and the I / I circuit 17 of the switching node of the additional sequences, and the clock pulses from the output of the generator 3 are fed to the additional fourth input (clocking) of the parity and oddness control circuit b, which generates control signals m body 7.

In case of a mismatch between the control signal and the result of the action of the executive body 7, the control unit 8 sends a trip signal to the electronic key 2 trigger.

The state of the elements of the switching node of the additional sequences 9 in operation is shown by the example of the formation of additional sequences of pulses.

When the switch 10 is in the 1, 2, 3, and 4 positions, the device generates 1, 2, 3, and 4 additional pulse sequences, respectively.

The formation of the first additional sequence of pulses occurs as follows. The switch 10 is set to unit when the first command pulse arrives, the triggers are switched to one state, the signal from the output of the first trigger includes a constant frequency generator 3, the clock pulses from which are fed to the counting input of the binary counter 4 and to the fourth fourth input clocking the circuit 6 of the control of parity and oddness, the signal from the output of the second trigger allows the counting of pulses to the counter 4, information from which is sent to the encoder 5 and further to the information inputs Hema 6 parity and odd parity, an additional input which receives the signal output from the inverter 16 (in the case of forming the first additional sequence it is zero)

and the signal from the output of the AND circuit 17 (in the case of forming the first additional sequence, it is zero) from the output of the evenness and oddness check circuit 6, the control signal is fed to the actuator 7, etc. The signal from the output of the 3rd bit of the counter 4 is fed to the shaper 19 of the switching node of the additional sequences 9, where a drop signal is generated on the trailing edge of the pulse, which returns the first trigger and the counter 4 to the zero state, and also passes through the electronic key 12 , returns to the zero state the second trigger.

The formation of the second, third and fourth sequences occurs in a similar way.

When the switch 10 is in the fifth and sixth position, the device forms the first, second and third, fourth additional sequences, respectively. In this mode, after the first (third) sequence is formed by the eighth pulse, an intermediate stop occurs - the pulse from the output of the former 19 of node 9 is set to the zero state, the first trigger, counter 4, one is written to the position counter 18, the constant frequency generator 3 is turned off. device from the source of command pulses 1 is the formation of the second (fourth) sequence. The first trigger is switched to the single state, the constant frequency generator 3 is turned on, the pulses are started by the counter 4, and the like. On the eighth (sixteenth) clock pulse, the driver 19 generates a pulse, which returns the first trigger and the counter 4 to the zero state, adds one to the position counter 18 ,. the signal from the second output of which, having passed through the electronic key 13, is a reset signal, which sets in the zero state the second trigger, which brings the meter 18 to the zero state.

When the switch 10 is in the seventh position, the device forms in sequence the first, second, third and fourth sequences of pulses. At the eighth, sixteenth and twenty-fourth clock pulses, an intermediate circuit stop occurs, in which the first trigger is set to the zero state, turning off the constant frequency generator 3, the counter 4 is set to the zero state, one is added to the position counter 18.

A restart of the device is performed by a source of command pulses 1.

The circuit returns to its initial state by a thirty-second pulse through the circuit, the output of counter 4, driver 19, position counter 18 (output 4), electronic switch 14, electronic switch 2 trigger.

To execute the algorithm for forming additional pulse sequences, the output signals from the third and fourth node 9 are manipulated through the elements 11,15,16,17 and 18 supplied to the parity check circuit 6.

The seismic source control device allows the formation of additional pulse sequences with a duration of 1,2,4,8 ... 2 l pulses, which expands the functionality of the seismic source control device.

Claims (2)

Claim 1. Seismic source control device containing serially connected command pulse source, electronic key, constant frequency generator, pulse counter, executive body of the seismic wave generator, the output of which is connected to the first input of the excitation control unit, the output of which is connected to the second input an electronic key, an encoder whose inputs are bitwise connected to the outputs of a pulse counter, an information control unit whose inputs are bitwise connected to you encoder moves, and the output is connected to the actuator input of the seismic wave generator and the second input of the excitation control unit, characterized in that, in order to expand the field of application, an additional sequence switching node is inserted into the source, the first input of which is connected to the additional output of the pulse counter, and the second input - with the second output of the electronic key, which is connected to the third input of the pulse counter, the second input of which is connected the third output of the electronic key, the third input of which is connected to the first output, and the fourth input - to the second output of the switching node of the additional sequence, the third and fourth outputs of which are connected to the second and third additional inputs of the information control unit, the fourth additional input of which is connected to the generator output constant frequency. 2. The device according to claim 1, wherein the switching node of the additional sequences comprises a switch, first and second encoders, four electronic keys, an inverter, an AND circuit, a position counter and a driver, the switch outputs are connected respectively to the inputs of the first encoder, the first four outputs of which are connected respectively to the first inputs of four electronic keys, and the fifth output to the input of the inverter and the output of the fourth electronic key , the combined output of the first, second and third electronic keys form the first output of the switch node of the additional sequences, the first input of which is formed by connecting the input of the imaging unit and the first input of the circuit I, the second input of which is connected to the sixth output of the first encoder, the output of the imaging unit is connected to the second input of the first electronic key and the counting input of the position counter and is the second node output switch additional sequences, the outputs of the position counter are connected respectively to the inputs of the second encoder, the outputs of which are connected respectively to the second inputs the second, third, fourth electronic switches of the AND circuit, the output of which is the fourth output of the switch node of the additional sequences, the third output of which is the output the inverter, and the second input is the installation input of the position counter. 1 Fig 2