Title :
Computer control of a slow-AC technique for thermopower measurements
Author :
Marcy, Henry O. ; Marks, Tobin J. ; Kannewurf, Carl R.
Author_Institution :
Northwestern Univ., Evanston, IL, USA
fDate :
10/1/1990 12:00:00 AM
Abstract :
A measurement algorithm and the required instrumentation for computer automation of temperature-dependent thermopower measurements over the range of 4.2 to 350 K are described. The performance of the measurement system is demonstrated by examining typical results obtained on bulk and thin film samples of the thallium-based ceramic superconductor. The quality of the measurement data obtained is improved by increasing the density of the collected data and by improving reproducibility of the results
Keywords :
barium compounds; calcium compounds; computerised control; computerised instrumentation; electric variables measurement; high-temperature superconductors; thallium compounds; thermoelectricity; 4.2 to 350 K; Tl-Ba-Ca-Cu-O; bulk simple; ceramic superconductor; computer automation; computerised instrumentation; data acquisition; high temperature superconductor; reproducibility; thermoelectric power; thermopower; thin film samples; Automatic control; Automation; Charge measurement; Conductivity measurement; Current measurement; Electrical resistance measurement; Temperature dependence; Temperature distribution; Temperature measurement; Voltage;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
