Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1974-07-29
1976-05-18
Tung, T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
204195B, 204195R, G01N 2746
Patent
active
039575926
ABSTRACT:
Apparatus and method for the measurement of a cell current. A polarographic cell, which may be a two or three electrode system, furnishes a cell current which is a measure of a particular constituent of a material under test in the cell. The electrodes are continuously washed by a buffer solution which gives a base line or steady state current. The current from the cell is converted to a voltage for ease of measurement. The first derivative with respect to time is taken of the voltage. When this rate of change of voltage exceeds a pre-selected level, a signal is generated. This signal causes a sample and hold unit to hold and present as a constant output the voltage level at that time. This is the steady state value. The signal also resets a peak detector which accepts the cell voltage and tracks its value until a maximum is reached. Then, the maximum value is held as a constant output quantity. An electronic difference amplifier subtracts the steady state voltage from the maximum detected voltage to give a value of voltage representing the true peak level.
REFERENCES:
patent: 3421982 (1969-01-01), Schultz et al.
patent: 3539455 (1970-11-01), Clark
patent: 3542662 (1970-11-01), Hicks et al.
patent: 3857771 (1974-12-01), Sternberg
Malmstadt et al., "J. of Chemical Education," Vol. 43, No. 7, July, 1966, pp. 340-353.
Holler Edward J.
McLary Steve M.
Owens--Illinois, Inc.
Tung T.
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