Patent ID: 6762059
Filing Date: 2004-07-13
Classification: B01F,B01L,C12Q,G01N,Y10T

Abstract:
A method for determining velocity of a single elongated polymer said method comprising measuring a plurality of signal amplitude profiles of said elongated polymer, each signal amplitude profile comprising measurements taken at a different one of a plurality of detection zones, wherein said plurality of detection zones consists of a first and a second detection zone, as the elongated polymer moves along a path past the first and second detection zones and determining said velocity of said elongated polymer from said plurality of signal amplitude profiles, wherein said plurality of signal amplitude profiles consists of a first signal amplitude profile comprising measurements taken at said first detection zone-and a second signal amplitude profile comprising measurements taken at said second detection zone, wherein each said signal amplitude profile comprises measurements in the first and second detection zones of a signal generated at said elongated polymer at a plurality of times, said plurality of times comprising times that are before, during, and after said elongated polymer is in said detection zones, wherein said plurality of detection zones are located in order along the path of said elongated polymer at predetermined distances, and wherein said plurality of signal amplitude profiles are measured in a time-correlated manner, wherein said velocity of said elongated polymer is a center-of-mass velocity and wherein said determining said velocity comprises(a) determining temporal location of a first center-of-mass in said first signal amplitude profile and temporal location of a second center-of-mass in said second signal amplitude profile; and (b) calculating said center-of-mass velocity by dividing distance between said first and second detection zones with difference between temporal locations of said first center-of-mass and said second center-of-mass.