A TWO ELECTRODE ELECTROCHEMICAL SENSOR FOR DETECTING TRACE PROPELLANTS IN AIR
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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The accurate detection of UDMH to its threshold limit value is achieved with a two-electrodeelectrochemical sensor and a KI electrolyte. Three electrolytes are tested with two cells to realize this detector. The theory of electrochemical reactions in solutions is valid for this sensor, and the large capacitance is explained by the electric double layer concept. An equivalent electrical model is derived to optimize sensor response. A flow system and standard measuring instruments are used to obtain the experimental results. The electrochemical reaction between the cell and UDMH results in a decrease of overvoltage in proportion to the concentration of UDMH in air. Finally, a linear approximation of this reaction is obtained with a UDMH equivalent circuit.
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- Liquid Rocket Propellants