The measurement sensitivity of the probe to the beam position can be changed. The experiment proves that the distance becomes smaller, that is, the coupling capacitance of the probe to the beam becomes larger, which has a certain effect on the sensitivity of the probe and the effect of reducing the spurious signal. The voltage signal induced on the button electrode is transferred to the cable plug core via a tin bronze spring. However, this design did not get the expected waveform signal in the experiment, and it is far from the original waveform, and there is a large distortion. The distortion waveform has a large “step†on the flat top of the square wave, and the pulse width It is also far from the reference waveform.
Analysis and improvement of the design Because the waveform obtained by the test is not normal, we believe that the problem lies in the design of the probe. After careful analysis, it is found that there are several defects in the design. The back surface of the button electrode and the measuring disk have a partial area. And the distance is very close, so that the button electrode and the ground form a large stray capacitance; the through hole portion of the measuring electrode on which the button electrode probe is mounted is not designed with the electrode rod of the button electrode as the transmission cable plug and the cable impedance Matching (75O), which also causes a large stray capacitance between the button electrode and the ground; there is a transition spring between the cable plug and the electrode, which forms a large stray inductance during signal transmission; The combination of the copper electrode rod and the plexiglass tends to cause the plexiglass to wear, thereby affecting the alignment accuracy of the four probes. These points directly lead to abnormal waveforms in the experiment. In view of the above problems, we have made some improvements to the design of the button electrode measuring disk, and improved the partial enlarged view of the button electrode mounting through hole on the disk body. The cable plug core is still connected to the bolt by a spring. Since the spring is in contact with the inner wall of the bolt, the influence of stray inductance on the signal transmission can be eliminated.
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