Cut Sawtooth

what are sawtooth potentials?

related to scanning and synchronisation in physics

I am not sure about the answer to your question, but, if your question is some thing related to Electronic Cathode Ray Tube and Cathod Ray Oscilloscopes (Analog type- or Old type), Then these answers may help you.

In Cathode Ray tube(Cathode ray oscilloscope is similar to this), the electron beam developed at the gun travels straight to Screen with some Fluorescent material. Say this as Z direction.

Now Perpendicular to Z we have X say Horizontal, Y Vertical.

The electron beam has to move on entire rectangular screen. How? Electron beam bends in Electric and Magnetic Fields.(let us use Electric field here) .

More the electric field more the bending and less the field less is bending.
Field comes out of potential(and potential comes out of field).

The Electron beam is moved from One corner to other corner(diagonally oposite) with the help of Two sets of scanning called Raster Scanning.

Here we use the saw tooth potential.

How You read My writings.

ABCDEFGH
IJKLMNOPQ
RSTUVWXY
Z...............?

You begin from A and move to B, C,D so on upto H and then Immediately you Jump to I and then Go to J, K L so on upto Q. You make a Jump here to R and move to Y and Jump to Z and move upto ? through all dots(............).

This is called Sweep or Scanning.

Electron beam is swept from A to H by increasing the voltage Linearly(like 0 1 2 3 4 5 6 7 8 9 10) in time (0 1 2 3 4 5 6 7 8 9 10) seconds or units.

Now electron has to go to new line and therefore its voltage is suddenly dropped to 0 from 10.

this process continues and if you make a graph it looks like a saw .( the one which is used to cut logs or wood).

Thus the potential is named as saw tooth potentials.

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