Title :
Displacement measurement of optically trapped particles by a laser diode phase sensor
Author :
Uchiyama, Toshio ; Lai, Guanming
Author_Institution :
Shizuoka Univ., Japan
Abstract :
A method of sensing single particles in liquid using a diode laser for both trapping and phase measurement is proposed. Optical trapping makes it possible to fix a single particle in liquid and optical feedback effect of the laser diode is used to measure the wave-front of the scattered light. An analysis method of obtaining the position information from the laser intensity signal is described. Experimental results of measured displacement of optically trapped particles by the proposed phase sensing method are shown.
Keywords :
displacement measurement; light scattering; measurement by laser beam; optical feedback; phase measurement; semiconductor lasers; displacement measurement; laser diode phase sensor; laser intensity signal; liquid; optical feedback effect; optical trapping; optically trapped particles; phase sensing method; scattered light wave-front measurement; single particles sensing; Charge carrier processes; Diode lasers; Displacement measurement; Laser feedback; Light scattering; Optical feedback; Optical scattering; Optical sensors; Particle measurements; Phase measurement;
Conference_Titel :
Industry Applications Conference, 1998. Thirty-Third IAS Annual Meeting. The 1998 IEEE
Conference_Location :
St. Louis, MO, USA
Print_ISBN :
0-7803-4943-1
DOI :
10.1109/IAS.1998.729786
