NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Surface water pipe refers to water supply, drainage (rain, sewage), gas, electricity, communication, thermal, industrial pipeline. It is an important part of urban infrastructure, which is the basic basis for urban planning, construction and management. At present, the ground pipeline detection work is referred to as water supply, drainage (rain, sewage), gas, electric power, communication, thermal, industrial pipeline.
It is an important part of urban infrastructure, which is the basic basis for urban planning, construction and management. At present, the most convenient and most effective in the underground pipeline detection work is based on electromagnetic method based on electromagnetic inductance. Underground pipeline detector is a such device.
The receiver measures the change in the secondary field generated under the action of the transmitting airport on the ground to determine the spatial position of the underground line. It is generally believed that the secondary field excited by a straight line can be seen as an electromagnetic field generated by unlimited long straight lines. The receiving device is based on such electromagnetic field changes to determine the depth.
The experimental results show that the measurement results are very accurate without other pipeline field interference. For accurate, fast and efficient pipeline detection, different detection methods should be selected according to the characteristics of the ground pipeline. The detection method of the pipe detector can be divided into the following categories: First, induction detection method.
The buried tube detector is the principle of electromagnetic induction, detecting the precise direction and depth of underground metal pipes and cables, and finds the fault point outside the pipeline, the buried pipe detector has the intelligentization of all Chinese characters, graphical operation instructions and audio modulation The indication is the most convenient bury tube detector today. The transmitter has a built-in ohmmeter that automatically measures the loop resistance and automatically outputs impedance matching to ensure excellent output signal. This instrument can use a coupling according to the actual application, and in the case of constant electricity, it is used to find a passage of the charged cable for testing.
With the 50Hz detection function of the receiver, track the 50Hz power frequency signal emitted by the cable, which is really used, with the best performance cost. Its basic working principle is: the transmitter generates electromagnetic waves, and transmits the transmitted signal to the metal line detected underground by different transmit connections. When the upper metal line is induced, the induction current, induction current edge is generated on its surface. The metal pipeline is spread to the distance. During the current propagation process, the electromagnetic wave is radiated from the ground metal line, and therefore, when the local line detector is detected on the ground, the underground metal line is received directly above the ground, and the electromagnetic wave signal is received. The position and direction of the underground metal line can be judged by the strength of the signal. According to the principle of detection, the underground pipeline detector is divided into two categories. One is to use electromagnetic induction principles to detect metal lines, electric / optical cables, and some non-metal lines in some non-metal pipelines, referred to as line detectors; the other Using electromagnetic waves to detect underground lines of various materials, it can also be used to find underground embedded objects, commonly known as radar or pipe radar.
About the relevant content of the underground pipeline detector, Xiaobian will introduce it to you today, more exciting content, continue in the next period! .
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