摘要:

The potential of UCSD Pascal as a programming language for data acquisition and analysis was investigated. Cyclic voltammetry and chronoamperometry were automated by interfacing a BAS CV-27 potentiostat to an Apple II+ microcomputer. With the UCSD Pascal programming language, a modular approach was taken to solve our system design problem. Thus, smaller programs and library UNITs were written that collectively tackled a relevant electro-analytical problem. Here we focus on a modular approach to system design by discussing software techniques and applying them to the analysis of polymer modified electrode experiments. Additional conclusions relate this approach to other microcomputers, programming languages, and system designs.

ISSN:1073-9149    

DOI:10.1080/10739148808543684

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

This paper describes a dual wavelength controller for automated changing of the emission and wavelength settings of a fluorescence detector during a HPLC run. A test application to the analysis of polycyclic aromatic hydrocarbons is described.

ISSN:1073-9149    

DOI:10.1080/10739148808543685

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

A high speed waveform generator capable of producing symmetrical and asymmetrical triangular ramps and pulses is described. Conventional analog circuitry is used to synthesize potential ramps at scan rates ranging from 10−3to 105Vs−1. Digital circuitry is used to produce potential pulses ranging from 1 ms to 100 s in duration. The initial, upper, lower and final potential limits can be set independently over a ± 10 V range. The initial scan direction can be preselected and the instrument can operate in a single or repetitive mode. A waveform can be stopped, held and restarted at any potential by pressing a series of front panel switches. The waveform scan direction can also be reversed manually while scanning. Both the potential scan and pulse waveforms can be monitored simultaneously and a 5 V, 50 μs trigger pulse is provided for triggering an external device.

ISSN:1073-9149    

DOI:10.1080/10739148808543686

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

A digitally controlled waveform generator and potentiostat controller, which is designed for rapid sweep electrochemical techniques such as cyclic staircase voltammetry at stationary electrodes, is described. It is a simple design, consisting of MOS memory coupled to a digital-to-analog converter for waveform generation and a crystal clock and a programmable interval timer for waveform and measurement timing. It can be used with any type of potentiostat, but is specifically designed for use with one incorporating a gated integrator. The simplicity of the circuit holds the digital noise to a minimum, yet versatility and speed are maintained. Any pulse waveform can be generated provided that all pulses have the same period. Pulse periods vary from 50 μs to 65 ms, and measurement periods from 25 μs to 65 ms, both with a resolution of 1 μs.

ISSN:1073-9149    

DOI:10.1080/10739148808543687

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

An x-ray gauging system is described for nondestructive quantitative analysis. The automated device utilizes the transmission of low-energy x-rays through a material in order to measure the areal density of the material. Under some conditions, one material may be examined in the presence of another. Using digital rather than analog conversion techniques, measurement precision of 0.1% and accuracy near 0.5% have been achieved, with analytical correction for x-ray detection losses. The accuracy of the instrument has been demonstrated by comparison with chemical quantitative analysis techniques. Compared to chemical techniques, the x-ray gauge is faster, lower cost and nondestructive while maintaining measurement accuracy. Accuracy has also been demonstrated for elements for which calibration standards were not available. The gauge employs radioisotopic x-ray sources, a sodium iodide detector, and a single channel analysis system to measure the x-ray transmission of the material under study. Motorized translation stages allow specimen scanning in two dimensions. A barcode reader is integrated. into the device for sample identification. A personal computer system handles instrument calibration and tuning, device control, data acquisition and analysis, and data reporting and storage functions.

ISSN:1073-9149    

DOI:10.1080/10739148808543688

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

ISSN:1073-9149    

DOI:10.1080/10739148808543689

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

ISSN:1073-9149    

DOI:10.1080/10739148808543690

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor