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Allow for Negative Time? #8

@ErichZimmer

Description

@ErichZimmer

Premise

Negative time values can be used to help visualize a pulse sequence. This is particularly useful for wrapping one's mind around how to synchronize Nd:YAG lasers with a double shutter camera. Negative time does not imply that the synchronizer predicts when to send the signal. Instead, it shifts the entire pulse sequence by the absolute value of the negative pulse.

Context

I can't remember where, but one of the Tomographic PIV papers I read a while ago used this concept. I'll have to see if it's in my database of papers, but in essence, they used it to time the flashlamp and q-switch with each shutter of the camera.

Solutions

Add the capabilities of accepting negative time values and shift the netire pulse sequence by the absolute value of the largest negative value.

Alternatives

This is a quality of life "hack". and does not require any change to the firmware. There is no other reason to implement this other than for the few specific possible users that may want this feature. I know I never used it before, but I also never used a real commercial dual oscillator pulsed laser either. Maybe I should hold off on this until the first milestone is hit.

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