Date of Award
Master of Arts
Dr. James Howell
Dr. Robert Anderson
Dr. Ralph Steinhaus
Masters Thesis-Open Access
A Jarrell-Ash Atomic Absorption/Flame Emission 82-360 Spectrometer was interfaced to a Heathkit ETA-3400 microprocessor. The microprocessor is used to pulse the hollow cathode lamp from a "steady" current to a "peak " current during the opening of the chopper. The current from the photomultiplier-tube is converted to a proportional voltage which is supplied to a sample-and-hold circuit. A successive approximation routine is used to convert the voltage to a representative digital value. Digital values are obtained for the "blank" and "sample" and are used to calculate percent absorption values. The system can also be used to obtain emission values.
The system was used to determine the concentration of chromium and nickel in steel by the "standard addition method". As light loss in sensitivity was found at higher lamp intensities.
Schilling, James B., "A Microprocessor Controlled Pulsed Hollow Cathode Lamp for an Atomic Absorption Spectrometer" (1983). Master's Theses. 1660.