Title :
Dynamic particle-shape measurements using a near-field optical sensor
Author :
Nieuwenhuis, J.H. ; Bastemeijer, J. ; Bossche, A. ; Vellekoop, M.J.
Author_Institution :
Inst. IEMW, Vienna Univ. of Technol., Austria
Abstract :
In this paper dynamic particle-shape measurements are presented using a near-field optical sensor. The sensor consists of two elongated photodiodes that are illuminated from the top. When a particles moves over the sensor it will partially block the light, which results in a drop of photocurrent proportional to the width of the particle. We have performed measurements using irregularly shaped PVC test particles having a diameter of 30-80 microns. The measurements prove that accurate size and shape information is obtained under the conditions that are found in a cytometer.
Keywords :
biological techniques; optical sensors; particle size measurement; photodetectors; photodiodes; shape measurement; dynamic particle-shape measurements; elongated photodiodes; integrated cytometer; optical sensor near-field; particles width; photocurrent reduction; shape information; size information; Electronics industry; Industrial electronics; Instruments; Optical sensors; Particle measurements; Photoconductivity; Photodiodes; Sensor systems; Shape measurement; Strips;
Conference_Titel :
Sensors, 2002. Proceedings of IEEE
Print_ISBN :
0-7803-7454-1
DOI :
10.1109/ICSENS.2002.1037003
