Automated system to acquire fluorescence, polarization and anisotropy maps within liquid flows

Abstract

Maps of polarization and anisotropy can be helpful for £ow analysis systems (FIA, CFA, etc.)

Effects of paraffin chain size on the oil outflow investigated by a combination of thermal lens and laser-induced fluorescence spectrometries

“…The signal detection is divided in two different parts, simultaneously managed by our own computerized system for sample detection, control, and placement [27,28].…”

“…To better understand the dynamics associated with the mass distribution caused by liquid displacement in the flow system, the detection cell was fixed to an automatic homemade sample positioner [28].…”

“…The motors have a 10-lm precision in each direction, with an error lower than 0.1%. Depending on the diameter of the excitation beam, the resolution of the maps may reach values of 400 points/ mm 2 [28].…”

Detection of chemical alterations at internal walls of microchannel flow cells by nondestructive fluorescence depolarization

“…It consisted of two 12-bit ADCs (ADS 7804 from Burr Brown), two stepping motor control units, and one 4-channel micro-valve control unit. The MF cell position was varied uniformly in relation to the laser beam direction by a two-axis translation frame [20] based on two stepping motors and remotely controlled by software written in Q-BASIC that permits sample positioning and real time data acquisition. The device had mechanical repeatability of better than 0.1%.…”

Observation of wall wettability under imposed flow by fluorescence depolarization: dependence on surface oxygen content and degree of polymer branching

“…Fluorescent depolarization of rhodamine in free-flowing films (FFF) generated by a liquid lobed jet [9] impinging on a nearly vertical solid surface has proved to be sensitive to different chemical constitutions of both the surface [10] and the flowing liquid [11], as well as the orientation of surface hydroxyls [7].…”