Graduate Thesis Or Dissertation

 

An analysis system for the remote determination of oxygen with data transmission via pulse duration telementry Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/mw22v809b

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  • An instrument was developed which performs analysis of the oxygen content of air by means of a commercial polarographic oxygen electrode. The oxygen analyzer is part of a portable instrument which converts the current from the oxygen electrode into a pulse whose width is proportional to the oxygen concentration. This pulse is suitable for transmission by FM telemetry. The instrument is capable of handling up to six additional channels of pulse-width information. The seven channels, plus a channel of synchronizing information, are transmitted sequentially over a radio or wired link to demultiplexing circuitry, which separates the pulses into different channels. The pulse width is then converted into a voltage analog suitable for recording. The system shows no detectable drift over long periods of operation other than that due to the temperature coefficient of the oxygen electrode. Linearity of the instrument is excellent except in the pulse-width to analog voltage converter, which exhibits a slightly curved response. As a result, the plot of oxygen concentration at the electrode versus voltage output to the recorder is not quite a straight line. For changes of less than 5 or 10% oxygen, the nonlinearity is not detectable on a recorder.
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