Petrarchan Sonnet 
We've a nice section on JPiC dedicated to and specifically for poetic forms
I've done a bit of research on the Petrachan Sonnet and I've yet to hear of any particular rhythm/meter --- There is a specific rhyme pattern that you will see at the link above...
Apparently the strict protocol for the Petrachan Sonnet is that there is 1 octave and then a final sestet -- then the sestet has a pivot (change of meaning) in thought from the beginning lines.
Hope this helps

And I look forward to you posting your Petrarchan Sonnet on JPiC
ALSO - welcome to the Community
Jacquii.