eirp
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Hello,
I'm currently facing following problem:
We have slightly disturbed offset dish, trying to find its focus.
Dish's surface was scanned and physical optics was used to get E field in XY cuts near the estimated focus (Z). Our observation is that localization of E field amplitude isn't the best way for obtaining the focal region. However, interesting changes in phase distribution (out of focus/at focus) was found, but I have no explanation for that... (see picture)
It seems that in focal region phase of E field creates clear rings. Is there any mathematical reason?
Thanks!
eirp
I'm currently facing following problem:
We have slightly disturbed offset dish, trying to find its focus.
Dish's surface was scanned and physical optics was used to get E field in XY cuts near the estimated focus (Z). Our observation is that localization of E field amplitude isn't the best way for obtaining the focal region. However, interesting changes in phase distribution (out of focus/at focus) was found, but I have no explanation for that... (see picture)
It seems that in focal region phase of E field creates clear rings. Is there any mathematical reason?
Thanks!
eirp