| 摘要 |
What is claimed is an inspection device for in-tube monitoring of main pipelines by the method of ultrasonic wall thickness metering realized in a device traveling inside the pipeline and performing measurements, acquisition of measurement data and their interpretation. The device comprises a probing pulse generator, an ultrasonic transducer, an amplifier, a comparator with an analog input, a digital timer, a processor and a data storage module, and a controlled reference voltage source connected in series. The output of said reference voltage source is connected to the reference voltage input of the comparator, said reference voltage source being capable of setting at least two different voltages at its output. The comparator output is connected to one of the control inputs of the reference voltage source that allows one to switch threshold values in the comparator, when recording the ultrasonic pulses, to use one threshold value to record the moment of reception of the ultrasonic pulse reflected from the internal wall of the pipeline using another threshold value of the comparator to record the moment of reception of the ultrasonic pulse reflected from the external wall of the pipeline using the other threshold value. Thus, the operator can perform direct measurements of the transit time of the ultrasonic pulses in the pipe wall allowing him to increase the distance monitored per one pass of the device, and to increase the accuracy of measurements and the rate of hardware data processing compared to the prototypes known in the art.
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