Fast data acquisition systems

Over the last decade both the speed and accuracy of data acquisition and the sensitivity of the LEED experiment have been significantly improved. In most structure determination experiments the LEED patterns are displayed on a phosphor screen. LEED I-V curves are then measured by photometric or photographic means. Fast data acquisition systems have been developed that record LEED patterns with video cameras interfaced to computers and generate I-V curves during the experiment./3,4/ The sensitivity of LEED is also being greatly increased with the development of instruments that can detect single... 

At a wavelength at which absorbance or tluorescence occurs, the transducer output rises to a maximum after a few seconds of ignition followed by a rapid decay back to zero as the atomization products escape into the surroundings. The change is rapid enough (often <1 s) to require a moderately fast data-acquisition system, Quantitative determinations arc usually based on peak height, although peak area is also used. 

C. D Andrea, D. Comelli, A. Pifferi, A. Torricelli, G. Valentini, R. Cubeddu, Time-resolved optical imaging through turbid media using fast data acquisition system based on a gated CCD camera, J. Phys. D Appl. Phys. 36, 1675-1681 (2003)... 

With the advent of cheap microcomputers with fast data acquisition systems an even better approach is now available. The current-time data obtained over a wide time range are acquired directly into the computer s memory, and are then fitted to E uatio (2.20) using conventional curve fitting procedures to obtain values of k and k. 

Fast chromatography involves the use of narrow-bore columns (typically 0.1-mm i.d.) that will require higher inlet pressures compared with the conventional wide-bore capillary columns. These columns require detectors and computing systems capable of fast data acquisition. The main disadvantage is a much-reduced sample loading capacity. Advances in GC column technology, along with many of the GC-related techniques discussed below, were recently reviewed by Eiceman et... 

The instrumentation for voltammetry is relatively simple. With the advent of analog operational amplifiers, personal computers, and inexpensive data acquisition-control system, many computer-controlled electrochemical systems are commercially available or custom made. Programming complex excitation waveforms and fast data acquisition have become a matter of software writing. 

Hites, R.A. Biemann, K. A Computer-Compatible Digital Data Acquisition System for Fast-Scanning, Single-Focusing Mass Spectrometers. Anal. Chem. 1967, 39, 965-970. 

Sakai T, Hamano T, Kamiya T, Murozono K, Inoue J, Matsuyama S, Iwasaki S, Ishii K (1998) Development of a fast multi-parameter data acquisition system for microbeam analyses. Nucl Instrum Methods Phys Res B 136-138 390-394... 

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