Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1989-03-24
1991-01-15
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
73 1R, 73 1G, 204401, G01N 2746
Patent
active
049851233
ABSTRACT:
A coated polarographic sensor is calibrated by exposing the sensor to calibration media having known temperatures and species chemical potentials. The sensor is allowed to equilibrate with respect to the calibration media. After equilibration, the sensor is polarized with respect to a reference electrode and the resulting transient and steady state electrochemical currents are monitored. A transient calibration equation characterizing transient sensor performance is derived from the transient electrochemical current, and a quasi-steady state calibration equation characterizing steady state sensor performance is derived from the steady state electrochemical current. The transient current of the sensor is independent of the thermophysical properties of the species in the medium so that the transient current can serve to correct the quasi-steady state calibration equation for the sensor in situ. This in situ calibration of the steady state performance of the sensor allows for the application of thinner coatings of the sensor. The use of thinner coatings results in a sensor that responds more quickly to changes in chemical potential of the species. The sensor also registers a larger current at a given chemical potential thereby improving overall sensor performance.
REFERENCES:
Winlove et al., "The Measurement of Oxygen Diffusivity and Concentration by Chronoamperometry Using Microelectrodes", J. Electroanal. Chem. 170: 293-304 (1984).
Hale et al., "Some Considerations of the Steady State and Transient Behavior of Membrane-Covered Dissolved Oxygen Detectors", J. Electroanal. Chem., 107: 281-294 (1980).
Hoffer et al., "Preliminary Study of On-Line Computation of Cardiac Output Using Indwelling Oxygen Catheters in Man", Fed. Proc. 31: Abs. 786 (1972).
Kunze et al., "Absolute PO.sub.2 Measurements with Pt-Electrodes Aplying Polarizing Voltage Pulsing", Adv. in Exp. Med. and Biol. 37A: 35-43 (1973).
Kaplan G. L.
Massachusetts Institute of Technology
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