SU1487084A1 - Unit for data transmission - Google Patents

Description

The invention relates to telemetry and can be used to transmit information from telemetry sensors in wells of small diameter during geophysical surveys. The purpose of the invention is to increase the information content of the device. The device contains 1 clock pulse generator, 2 frequency divider, distributor 3, generator 4 block, decoder 5, subtraction block 6, analog-to-digital converter 7, indicator 8, communication line 9, sequential CS chains 10, UP and sensors 11, -11 _p . 2 Il.

£ 11,. ,, 1487084 A

No. /

3

1487084 ·

four

The invention relates to telemetry and can be used to transmit information from telemetry sensors in wells of small diameter during geophysical surveys.

The purpose of the invention is to increase the information content of the device.

Figure 1 shows the functional diagram of the device; ’in Figure 2 diagram of the subtraction unit.

The device contains 1 clock pulse generator, 2 frequency divider, 3 pulse distributor, 4 generator block, decoder 5, subtraction block 6, analog-to-digital converter 7, indication block 8, communication line 9, sequential CS chains 10 ,, ... , 10 ^ and sensors 11 ,, ..., 11 ^.

Block 6 subtraction consists of resistors 12-16, variable resistor 17, diodes 18-21, capacitors 22 and 23.

The device works as follows.

At the command "Start" the generator 1 clock pulses produces clock pulses on the divider 2 frequency. These ^{: the} pulses simultaneously arrive at the input of the ADC 7, made, for example, according to the bitwise weighting scheme. The pulses taken from the output of the divider frequency 2, then fed to the input of the valve 3. The pulses from the outputs of the valve 3 in parallel are fed to the inputs of the decoder 5, where they are perceived as addresses of controlled points (1, p), and block 4 of the generators.

These pulses switch a block of 4 generators, which in parallel sends a fixed frequency to the block 6 readings and to the communication line on the C-link E.d. — 10 _n and sensors 11, -11 ,,.

The fixed frequency E · is chosen by the corresponding bc-chain 10 ·. Changing the filter parameter, carried out in the sensor 11; leads to a change in its resistance, and consequently, the amplitude of the current in the communication line, which is recorded by the block 6 subtraction. The signal from the output of block 6 in analog form is fed to the input of the ADC 7, which under the action of the clock pulses from the generator 1 converts the analog signal into a code fed to the decoder 5, and then

in block 8 of the display, on the display element corresponding to the selected KP. On the next clock cycle 3. information is transmitted from the next CP. '

When using inductive or capacitive sensors as sensors 11, the resonance of the corresponding C circuit is shifted relative to a fixed frequency, which. leads to a change in the amplitude of the AC at a given frequency. When using a resistive sensor changes the resistance of the circuit, which leads to a change in the amplitude of the alternating current.

The current signal in the communication line 9 is converted into voltage by means of a resistor 12 connected in series with the communication line 9. The voltages C _g and I, supplied to the first and second inputs of subtraction unit 6, are rectified by means of diodes 18-21, detected on capacitors 22 and 23, and subtracted. The difference of the amplitudes of the voltages is fed to the input of the ADC 7. Resistors 13-17 serve to reduce the temperature error and eliminate the effect of asymmetry.

Claims (1)

Claim A device for transmitting signals, containing at the control room a generator unit, a decoder, the outputs of which are connected to the inputs of the block, an indication, sensors at a controlled point, characterized in that, in order to increase the information content of the device, a clock pulse divider frequency, pulse distributor, analog-to-digital converter and subtraction unit, the output of the clock generator is connected to the control input of the analog-digital converter and through a divider h Costs with a pulse distributor input, the outputs of which are connected to the corresponding first inputs of the decoder and inputs of the generator unit, the first output of which is connected to the first wire of the communication line and the first input of the subtraction unit, the output of which is connected to the information input of the analog-digital converter, the output of which is connected to the second input is decrypted5 Pa, the second output of the generator block is connected to the second input of the readout block; the second wire of the communication line is connected to the third input of the unit; 1487084 ⁶ The wire of the communication line is connected to the first pins of all consecutive LC chains, the second terminals of which are connected to the second wire of the communication line through corresponding sensors.