By Doolittle E.
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Extra resources for A Study of the Motions of Forty-eight Double Stars (1917)(en)(3s)
CHAPTER, 4. 2. 24) where Urf’TJ = I and VTV = VV’ = 1. 36) . - 8 . -. .
It, is obvious that, the iilmiber oi’ particles X in t,hc observation volume must, satisfy N = min(A$, z77f)nncl for that uxwm wc tlrop the suffiscs. D P’TY is a,ppliwl, die numl)er of pr%rticlw n~liicli can be trxked is about SOO-1000. ; Eq. 3). 1. INTERPOLATION TO E:ULERL4N GR,lD 37 Throqghollt this section. WC aswme that the ~elwity error of t,hc scattered wlocity field has a constad stariclarcl clevia~tion. It n-ill be ShOW\rn thr%t We CFlll esta,blish an error estimate tha,t takes into account both the velocit-y crux originating from the PTV proccclure as well as tjhe int~crpolation error.
4) applie,y and w will not distinguish further between fiuicl velocity x1(1 particle velocity. The maximum numbc~r of particles A$ for the dct-e~rnination of pa,rticle coordinat~es is limited by the spatial resoliitioii of the C’C‘D sei1sors. X] gives a mimbcr for a 5-l 2 X 512 pixel sensor a,ntl pa,rt8iclcs that, image 14 pisels at aboiit hT, 7z 2400. Note thxt t’he n1rrnbw of padiclcs i\ii that can be imagrd is inclcpendent of the size of the observat,ion volmne and consequently also of t,lre particle n1rmber densit-,y.