Effect of Guide Rod on Signal
Effect of Guide Rod on Signal
In acoustic emission detection, the installation of the sensor will affect the signal acquisition. The closer the sensor is to the signal source, the greater the amplitude of the collected signal and the smaller the noise interference. But the sensor must not affect the operation of the entire system, and to protect the sensor, such as waterproof, high temperature, etc. Waveguide rods are often used here. The function of the waveguide rod is to transmit waveform information and safely and reliably transmit the signal source to the acoustic emission sensor. Some common types are listed below for reference. Coolant is often used in grinding experiments, and the waterproof performance of acoustic emission sensors is often considered by experimenters. In this case, a waveguide rod can be used to extract the acoustic emission signal, allowing the sensor to be installed outside the coolant sputtering range. In the detection of high-temperature containers, the surface temperature of the container is often high, and the sensor is directly coupled and easily damaged. The signal is derived from the waveguide rod where the temperature is gradually reduced. If a suitable length of the waveguide rod is selected, the acoustic emission sensor at room temperature can be used to detect high-temperature objects.
In some pipeline inspections, the pipeline is often buried in the ground. If multiple points need to be detected, each point will be dug to the position where the acoustic emission sensor can be directly installed, which will be a very large amount of work. The waveguide rod can be used to directly dig holes, or reserve holes during construction, and output acoustic emission signals. In some mechanical structures, when the sensor cannot find a suitable plane installation, or the installation surface is not easy to operate in the field, the waveguide rod can be used to output the acoustic emission signal. In the environment of soft geological conditions such as mine, slope and dam area, the sensor can not be directly coupled with the ground or the coupling effect is not good. At this point, the waveguide rod can be used to penetrate the geology and transmit the waveform to the sensor. Design the following experimental platform, using16MnRMaterial steel plate. The transmitter emits a pulse signal, which is transmitted to the sensor through the steel plate1, and then propagate to the sensor through the waveguide rod2. Comparison sensor1and sensor2Characteristic parameters of the received signal. It is found that the attenuation of acoustic emission signal by waveguide rod is very small. Under the same experimental conditions as above, by comparing the sensor1and sensor2The wave velocity of the signal in the waveguide rod is calculated. If the wave speed is different from the wave speed of the signal on the board, it will affect the position of the acoustic emission source.
The effect of different waveguide rods on the signal. The length, diameter, material and welding of the waveguide rod will affect the signal propagation. The guide rod is a guide element that is used in combination with the elements in the mold to ensure that the mold moves with accurate positioning to guide the mold stroke.
The material of the guide rod is generally selected from bearing steel, hot die forging steel, easy to turn iron, etc., and bearing steelSUJ2The use of large, greatly improving the guide rod in the guide performance of the durability and variability. The guide rod and parts constitute the outer guide rod assembly and the inner guide rod assembly, with beautiful metallic luster. There are high requirements for the roundness of the guide rod. The center hole is mainly used to grind the outer diameter with an external grinding machine, because the outer diameter with an external grinding machine needs to be turned against the center hole to grind the guide rod.
Guide rod
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2024-01-02
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