Yes, PIV is also there. No doubts. It's not clear why Dantec (he he he) website is linked to the explanation of PIV (I mean, why not to URAPIV blog, for example?), but still, it's a nice application. very nice. 

http://www.earthsky.org/shows/show.php?date=20060429 

 

this is the noisy jet engine. How do you know where most of the noise is produced? right. you do PIV.