Target limitation of resolution and signal/noise in mesh storage tubes

By assuming that the mesh holes are square and that the electron beams are Gaussian, both the sine-wave and the cross-scan response may be calculated for a mesh-type storage tube. The sine-wave response is the product of a function of the form . from the mesh holes and a Gaussian function from the electron beams. Cross-scan response always exceeds sine-wave response; the resolution at 50 percent cross-scan response is 5/3 times the resolution at 50 percent sine-wave response. The signal current through a mesh hole is directly proportional to the area of the hole. Variations in mesh hole size from point-to-point on the mesh produce errors or disturbance on the output signal. For example, a peak-to-peak signal to peak-to-peak disturbance ratio of 20 dB requires that the variation in mesh hole width be ± 2.5 percent. The disturbance may be observed in the output of an electrical-output mesh storage tube by photographing 50 to 100 superimposed traces from a line-selector oscilloscope display.