SU562784A1 - Borehole sonar - Google Patents

Description

The invention relates to radio engineering and can be used in an ultrasonic location.

A borehole sonar is known, comprising a serially connected receiving-transmitting unit with a calibrator and an azimuth sensor, a control unit and a storage device, as well as a frequency generator and a recorder, with the output of the frequency generator connected to one of the inputs of the storage device 1.

However, the known sonar has a low measurement accuracy.

The purpose of the invention is to increase the accuracy of distance measurement.

For this, a borehole sonar containing a serially connected receiving-transmitting unit with a calibrator and an azimuth sensor, a control unit and a memory device, as well as a frequency generator and recorder, the output of the frequency generator connected to one of the memory inputs, further comprises an adjustable digital converter frequencies with a device for changing the registration scale, as well as a series-connected pulse counter and a code-voltage converter, the outputs of which are connected with the TopOm register, the corresponding inputs of the adjustable digital frequency converter are connected to the output of the frequency generator, the output of the memory device and the first output of the control unit, the second output of which is connected to the second input

pulse counter, and the third output - with the recorder, while the output of the adjustable digital frequency converter is connected to the first input of the pulse counter. The drawing shows a structural electrical circuit of the proposed sonar.

The downhole sonar contains a transceiver unit 1 with a calibrator and an azimuth sensor, a control unit 2, a storage device 3, a frequency generator 4 and a recorder 5, the output of the generator 4 connected to one of the inputs of the storage device 3. The sonar also contains an adjustable digital frequency converter 6 with the registration scale change device, the pulse counter 7 and the code-voltage converter 8, the outputs of which are connected to the recorder 5, are connected in series, the corresponding inputs

adjustable digital converter 6 is connected to the output of the generator 4, the output of the storage device 3 and the first output of the control unit 2, the second output of which is connected to the second input of the counter 7, and

the third output - with the registrar 5, while

the output of the adjustable digital converter 6 is connected to the first input of the counter 7.

The sonar works as follows.

The pulses of the calibration base location time interval come from the transmitter / receiver unit / control unit 2, and from there to the memory device 3, which counts the generator 4 pulses in the continuation of the calibration base location time interval. At the end of the counting, at the output of the memory device 5 there is a code for the number of time intervals for the location of the calibration base. The said code sets the adjustable digitizer 6 with the necessary conversion factor. At the moment of time corresponding to the beginning of the measurement of the distance to the object being located, the pulse of the radiation moment arrives from the receiving-transmitting unit 1 to the control unit 2 and then to the adjustable digital converter 6, allowing it to start the frequency conversion operation coming from the generator 4. Value of the pulse pulse from the output of the digital converter 6 is uniquely determined by the time interval for the location of the calibration base and the chosen scale of registration. This means that the time interval for measuring the distance to a target object is linearly scaled by the output pulse sequence of digital converter 6 and allows you to assign the corresponding distance value in units of length to the time location of each pulse of this sequence in units of length for any value of the velocity of sound in the environment.

The sweep voltage from the output of the converter 8 is fed to the recorder 5, which performs a sweep in accordance with the received signals. The time stamps from the second output of the counter 7 are transferred to the recorder 5. The scan rate on the recorder 5 and the period of the time marks on the scan are uniquely interrelated. The pulses corresponding to the echo signals of the object being located, as well as the azimuthal orientation pulses come from the receiving and transmitting unit 1 to the control unit 2 and then to the recorder 5, where they are displayed. In this case, the location of the echo pulses on the screen of the recorder 5 is determined by the distance of the object being located, selected

the recording scale does not depend on the speed of sound propagation in the medium. The change in the registration scale is carried out with the help of the recording zoom device included in the adjustable digital converter 6 by setting the scale of the registration factor.

On the recorder 5, the shape, spatial position, and dimensions of the measured section are recorded at a given scale and standard units of length. The recording scale is independent of measuring the speed of sound propagation in the medium. The proposed sonar is characterized by high measurement accuracy, which remains unchanged in time, including under the influence of climatic factors. It has high reliability and speed, it is easy to manufacture, easy to set up and operate.

Claims (1)

1. USSR author's certificate L 317782, cl. E 21 B 47/00, 1969.