rical ▁signal ▁either ▁by ▁a ▁phot om ult ip lier ▁t ube ▁( P MT ) ▁or ▁a ▁P IN ▁di ode . ▁ ▁If ▁a ▁segment ▁measures ▁some ▁significant ▁amount ▁of ▁light , ▁the ▁experiment er ▁can ▁infer ▁that ▁a ▁particle ▁passed ▁through ▁that ▁segment . ▁ ▁In ▁addition ▁to ▁coordinate ▁information , ▁for ▁some ▁systems ▁the ▁strength ▁of ▁the ▁light ▁can ▁be ▁proportional ▁to ▁the ▁depos ited ▁energy . ▁ ▁By ▁doing ▁necessary ▁cal ibr ations , ▁the ▁depos ited ▁energy ▁can ▁be ▁determined , ▁which ▁then ▁can ▁be ▁used ▁to ▁infer ▁information ▁about ▁the ▁original ▁particle ' s ▁energy . ▁ ▁As ▁an ▁example : ▁a ▁simple ▁h odos cope ▁might ▁be ▁used ▁to ▁determine ▁where ▁a ▁particle ▁crossed ▁a ▁plane ▁or ▁a ▁wall . ▁ ▁In ▁this ▁case , ▁the ▁experiment er ▁could ▁use ▁two ▁segments ▁sh aped ▁like ▁stri ps , ▁arranged ▁in ▁two ▁layers . ▁ ▁One ▁layer ▁of ▁stri ps ▁could ▁be ▁arranged ▁hor izont ally , ▁while ▁a ▁second ▁layer ▁could ▁be ▁arranged ▁vert ically . ▁ ▁A ▁particle ▁passing ▁through ▁the ▁wall ▁would ▁hit ▁a ▁strip ▁in ▁each ▁layer ; ▁the ▁vertical ▁strip ▁would ▁reve al ▁the ▁particle ' s ▁horizontal ▁position ▁when ▁it ▁crossed ▁the ▁wall , ▁while ▁the ▁horizontal ▁strip ▁would ▁indicate ▁the ▁particle ' s ▁vertical ▁position . ▁ ▁H odos cop es ▁are ▁some ▁of ▁the ▁simplest ▁detect ors ▁for ▁tracking ▁charged ▁particles . ▁ ▁However , ▁their ▁spatial ▁resolution ▁is ▁limited ▁by ▁the ▁segment ▁size . ▁ ▁In ▁applications