SU550606A1 - Teleosimetric device - Google Patents

Description

one

The invention relates to the fields of telemechanics, dosimetry and experimental nuclear physics, and can be used to remotely measure the level of ionizing radiation with the transmission of results on television channels.

A teleosimetric device 1 is known that is used for remote transmission of information, comprising an ionizing radiation detector, a pulse shaper, a group of coincidence circuits, a controlled oscillator, OR circuits, a decoder, a communication channel modulator, and triggers. The device compresses the information from the ionizing radiation detector and transmits it to the TV channel.

A telemetry device 2 is known that can be used for remote measurement and transmission of dosimetric information, comprising a detection unit connected through a pulse shaper and a two-threshold unit to the first input of the relay and to the input of the first trigger, a generator connected to one input of the first And element, a power source, connected to the second input of the relay, the OR element, the second element AND, and the modulator connected to the transmitter, in which the input information is transformed ("compressed) Logarithmator-int (grator, output

the voltage of which is converted into a pulse frequency dependent on the state of the recorder. The frequency of the process of measuring and transmitting information is set by

two timers containing a large amount of equipment. At the same time, the recording of the pulse frequency in the recorder is performed by timing, which leads to an increase in the transmission time, and this in turn leads to an increase in the electricity consumption from the power sources. In addition, the code-converter-code converter, consisting of a logarithmic intensity meter, current-frequency converter and linear intensity meter, is an analogue circuit that is complex to configure.

The purpose of the invention is to reduce power consumption, increase the speed and performance of the device.

This is achieved by introducing a number driver, register, subtractor, clock counter, three AND elements, two triggers, and a prohibition block connected directly to the inputs of the second and third triggers, to the input device of the pulse generator, and a generator connected to the second AND element. and through serially connected first element And and element

OR to irovo.mu register input, through the second

element PI to the second register input, to the third element I and through the subtractor to the third input of the register connected with the first output to the modulator, the second and third to the two inputs of the two-threshold block, the fourth to the other input of the third element AND, the fifth - with the inputs of the fourth and fifth elements And, the other inputs of which are connected to the outputs of the second trigger, and the outputs are connected respectively to the fourth input of the register and its fifth input connected through a counter counter to another input of the second trigger and to the third input of the relay, and the output of the third element I is connected via the number former to the sixth input of the recorder and to the input of the subtractor, and directly to the other inputs of the first and third triggers, the unit inputs of which are respectively connected to another input of the clock counter and the other input of the first element I, and the zero output of the third trigger - with another input of the second element I.

Such an embodiment of the device makes it possible to combine the functions of timing, accumulation of information, its logarithmic compression and conjugation with the transmission path and execute them using a single register.

The drawing shows a block diagram of the described telemetry device.

Detection unit 1 is connected via pulse generator 2 to two-threshold unit 3 and through series-connected prohibition unit 4 and the OR 5 element to register 6. Two other inputs of two-threshold unit 3 are connected to two outputs of register 6, and the output to the first input of relay 7, input block 4 and the input of the trigger 8. The generator 9 is connected to another input of the block 4, and through the element 10 to another input of the element OR 5, and through the element 11 and 11 to the subtractor 12, the element 13 and another input of the register 6. Single trigger output 8 is connected to the element And 10. The output of the element And 13 is connected to the shaper number 14 and the inputs of the trigger 15 and 8. The unit output of the trigger 15 is connected to the clock counter 16, and the zero output to another input of the element 11. The output of the clock counter 16 is connected to the trigger input 17 and to the input of the relay 7. The other input of the trigger 17 is connected to the input of the trigger 15 and the output of the prohibition unit 4. The single and zero outputs of the trigger 17 are connected to the inputs of the elements 18 and 19, and the outputs of the latter are connected to the register 6. Other inputs of the elements 18 and 18 19 are connected to the register 6. The output of the driver number 14 to connected to register 6 and through subtractor 12- also to register 6. The output of power supply 20 is connected to relay 7.

The input of the modulator 21 is connected to the output of register 6, and the output to the transmitter 22.

The block 4 contains the start-stop circuit 23, the trigger 24 and the element And 25. The register 6 contains the shift-shift registers 26, 27, 28

and the element OR 29. The clock counter 16 contains a counter 30 and an AND 31 element.

The telemetry device has two modes of operation: the timing mode and the measurement mode and transmission of information. The power supply circuits of the detecting unit, imuliser, register, prohibition unit, two-threshold unit, three triggers, two AND elements and OR element are connected to the power source and all the others

Blocks - through normally open relay contacts and connected only in the measurement and transmission mode. The device works as follows.

A uniform sequence of pulses from the detection unit 1 (containing, for example, an ionization chamber with a charge-discharge circuit) enters the pulse shaper 2, where they are formed in amplitude and duration. The pulse frequency is proportional to the gamma radiation exposure dose rate. The generated pulses arrive at the inputs of the start-stop circuit 23 of the prohibition unit and the two-threshold block 3. The timing of the timing is determined by comparing the frequency from the output of the pulse generator 2 with the threshold setting of the two-threshold block 3. If the threshold is exceeded, the timing time is small. Timing intervals are formed in registers 6 by recalculating the pulses from the oscillator 9. Pulses arrive through AND 10, OR 5 at the input of register 6. At the same time, the trigger 17 is in a single state. And the input element And 18 with the trigger 17 and the resolution, and na input element And 19 - prohibition. The counting pulses from the output of the counter-shift register 26 to the input of the shift register register pass through the elements OR 29 and And 18. The conversion is performed by the shift-shift registers 26, 27 and 28. A timer with a smaller period of time is formed at the output of the shift-shift register 27, and, with a large one, at the output of the count-shift register 28. The timer marks arrive at a two-threshold unit having different trigger and release thresholds. The timer mark selected with the help of the two-threshold block 3 is fed to the inputs of the relay 7, the start-stop circuit 23 and the iR input of the trigger 8. The trigger 8 is set to the zero state, and the flow of pulses to the register 6 is terminated. The triggers of register 6 are set to zero. Relay 7 turns on the power for all units whose power supply is off for the duration of the timing. The start-stop circuit 23 selects two adjacent pulses coming from the output of pulse maker 2. One of them, “start is received

the trigger input 24. The pulses from the generator 9 through the element AND 25, the prohibition block 4, the element OR 5 begin to fill the register 6. The second impulse stop arrives at R - the input of the trigger 24 and sets it to the zero state. The pulse set is terminated. Number

the pulses collected in register b are proportional to the pulse following period from the pulse former 2, i.e.

f -A

T „

/ d

where N is the number of pulses received in register 6,

Gd is the period of the pulse following from the output of the pulse former 2, fr is the frequency of the pulse following from the generator 9,

/ d is the frequency of the pulse trace from the output of the pulse former 2. When selecting the proportionality coefficient K between the frequency / d from the output of the detecting unit and the measured power P, the exposure dose of gamma radiation is 1, which is usually provided by the detecting circuit. The values of / d and P are numerically rabbi, i.e.

-, from here

Lily

log log / r -log / v.

Realization of this expression gives the value of the measured value P in a “compressed logarithmic form. The value of / g is a constant. The base of the logarithm is chosen equal to 2, since Iog2 will get any number N written to register 6 by shifting it to the direction of the higher bits. The frequency value is chosen as a multiple of 2 and is permanently recorded in the subtractor 12 as a characteristic. The implementation of the expression loga / r-log2N is executed after the arrival of the command "stop on R - inputs of the flip-flops 15 and 17. This starts the shift of the number written in the score-shift registers 26 and 27 towards the higher bits, i.e. logarithm The shear pulses come from generator 9 through element 11 to register 6, into subtractor 12, and onto element 13. Shear continues until a unit appears in the senior position of the counter-shift register 27. At the same time, from the characteristic Iog2 / r in subtractor 12 subtracting the characteristic of the number log2A, i.e., the number of shifts is equal to the characteristic of the number log, and the count-shift register 27 contains the characteristic of the number loggP. After the unit in the higher discharge of the counter-shift register 27, at the output of the element And 13, a command is formed that sets the trigger 15 to the unit state and writes to the meter-shift register 28 via the number 14 transmitter of the telemetry device, and through the subtractor 12 - the characteristic Iog2P numbers. From the trigger 15 to the input element And 11 prohibits, and the input element And 31-resolution. From the output of the trigger 17 to the input element And 18 received permission. Next, the process of outputting the measurement result by shifting the characteristic and mantissa from register 6 through the modulator 21 to the transmitter 22 to the communication channel begins. Since the frequency of the generator 9 is greater than the permissible transmission rate of the communication channel, the pulses from the generator 9 are transmitted through the elements of AND 10 and SLI 5 to the counting input of the shift register register 26 and are recalculated. From the output of the shift-shift register 26 imp (imp), the losses come through the elements of the ILP 29

and P 19 pa shift input of the shift-shift register 27 and through the element P 31 in the counter 30. The counter 30 has a volume equal to the number of transmitted bits. After the required number of bits has been output from register 6 to modulator 21, at the output of counter 30, io is a command that sets the trigger 17 to one state. When this closes the element And 19 and opens the element And 18, i.e. register 6 fully operates as a counter,

providing a timed mode. The same command of the relay 7 disables the blocks that do not work in the Tai.mirovapi mode.

Claims (2)

1. USSR author's certificate No. 411409, M. Kl.2 G 01T 1/02, 12/13/1971. 2. USSR author's certificate No. 237646, M. Kl.2 G 01T 1/17, 02.02.1968 (prototype).