Measuring signal propagation speed
boreas_eos May 19, 2019 10:01 AMHi,
I am interested in measuring the time delay of signal propagation via two conductors (please see attached image below).
The aim is to measure time delay in signal propagation delay from point A to point B of two conductors when they have a different shape.
Assumptions:
 Both conductors are made of identical wire (same gauge, conductor, insulation)
 Both conductors have the same length (from point A to point B).
 Distance between point A and B is 10 meters (+ 1 millimeter error tolerance)
 Conductor 1 has a hollow sphere of the diameter of 1 meter in the middle. The length of sphere diameter (1 meter) plus the length of Conductor 1 wire (9 meters) adds up to 10 meters long which is equal to a length of Conductor 2
 We can assume that the capacitance and inductivity effects of cables can be neglected. Sphere acts as the capacitance, however, it should be negligible in terms of introducing signal propagation delay (please correct me if I am wrong)
Measurement:
 We wish to determine if a curved shape of the sphere delays the signal propagation. For example:
 The signal propagates via Conductor 2 in 3.3356 E8 seconds (time calculated by dividing 10 meters (Conductor 1 length) with speed of light in vacuum)
 The signal propagates via Conductor 1 in 3.5257 E8 seconds (as effective 'conductor' length is 10.75 meters as the signal travels 9 m through the wire + half sphere length which is 1.57 meters = 10.75)
What it all boils down to:
 How can we measure time delays of the order of E8 seconds?
I am a novice to a field and am not aware of such a method. Setup of the experiment is arbitrary, the image below is just an example. For example, We may connect Conductors 1 & 2 to the same current source at point A. At point B, we could connect Conductors 1 & 2 to piece of electronic (transistor, ALU operational logic unit), anything which can tell us via which conductor signal has arrived first, maybe we could use optical elements to do so? Means aren't important, what is important is to prove the existence of time delay.
Once existence of time delay is proven we will shorten one of the conductors until we make time delay minimal, meaning that signal will take the same time to propagate via both conductors (note: 'same time' isn't achievable, however, tolerance of few millimeters propagation difference [resulting in time delay of the order of E11] can be ignored)
If you have ideas on the subject I would like to hear from you mladen.golubovic@gmail.com / +12016658754
Thanks,
Mladen

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