Device for measuring the time of propagation of elastic waves in the array

 

(57) Abstract:

The invention relates to mining equipment, and is intended to assess the stress-strain state of rocks and diagnostics of array. The goal is to improve the accuracy of measurement of elastic wave propagation in the array and extending functionality by measuring the damping of the waves. When the wave propagation in rock mass fires closest to the source sensor-breaker and disconnects the DC circuit. Then after a certain period of time, due to the speed of wave propagation, works far sensor-breaker and disconnects the DC circuit. When triggered, each sensor pulse occurs, respectively starting and stopping the first counter node, which is the measurement of the travel time of the waves between the two sensors-breakers. The attenuation of the wave is determined by the time intervals between the opening and re-closure of both sensors-breakers, which are fixed second and third counting nodes. 1 Il.

The invention relates to mining and can be used for evaluating the stress-deformiroemosti to determine the time of propagation of elastic waves in rocks /1/, consisting of two sensors connected with the accounts node is configured to start and stop the account by the sensor signals.

A disadvantage of the known device is the impossibility of measuring the amplitude of an acoustic wave and a significant error of measurement of propagation time of the waves in the array, due to the instability of the acoustic signal from the sensors.

The purpose of the invention is to improve the accuracy of measurement of elastic wave propagation in the array and the assessment of their amplitude.

This objective is achieved in that in the known device introduced two additional accounts of the node, and each sensor is made in the form of sensor-breaker in the circuit constant current ability to supply pulses to the corresponding additional counting site for the beginning and termination of the account by measuring the duration between the moments of opening and closing the DC circuit, proportional to the amplitude of the acoustic signal.

In the known technical solution such distinctive features is not found, which makes the proposed solution with a significant difference.

The drawing shows a block when its in the array of rocks 9, blocks DC circuits 3, 4, counting the nodes 5, 6, 7. The inputs of the amplifiers counting nodes 5 and 6 and 5 and 7 are interconnected. Sensors-breakers included in the DC circuit, connected to respective amplifiers counting nodes 5, 6, 7.

The proposed device operates as follows.

The elastic wave generated by pulse source 8 will extend through the array of rocks 9 and reaching the sensor-breaker 1, will break the circuit constant current, resulting in an excitatory pulse AC, which is stable in amplitude and frequency. This momentum will be counting amplifier node 5, which will start the pulse count. Then after a certain period of time due to the propagation velocity of elastic waves, wave reaches the transducer-breaker 2 and opens the second DC circuit, which includes the sensor-breaker 2, there will be a pulse AC, also stable in frequency and amplitude, which goes to the input of the second amplifier in the counting node 5, and the pulse count in the counting node 5 will be on the scoreboard counting node locks the transit time of the waves from the sensor-breaker 1 to sensor-breaker 2.Similarly operates and the second channel with sensor-circuit breaker 2. Time of opening and closing the DC circuit sensor-circuit breaker 2 is fixed on a digital display counting node 7.

Knowledge of the amplitude of the wave at different bases sounding allows to determine the ratio and logarithmic decrement of damping of waves by known formulas.

Sources of information

Properties of rocks under different types and modes of loading, as amended Beron, A. I., Izd-vo "Nedra", 1983, S. 182 - 186.

Device for measuring the time of propagation of elastic waves in the array that contains two sensor connected with the accounts node vypolnennyh countable units, as each sensor is made in the form of sensor-breaker in the circuit constant current ability to supply pulses to the corresponding additional counting site for the beginning and termination of the account by measuring the duration between the moments of opening and closing the DC circuit, proportional to the amplitude of the acoustic signal.

 

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