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A test system has been developed that can be used to calibrate and determine the time response, linearity and temperature sensitivity of a fibre optic oxygen sensor. The simple system obviates the need for precision gas standards and the requirement to generate a true square wave step response, which is seldom achievable. The sensor is mounted in a small chamber containing air or a known fraction of oxygen. By means of a computer-controlled switch, the absolute pressure within the chamber can be changed rapidly to a new steady state value. The partial pressure of oxygen changes in direct proportion to the absolute pressure, and so the accuracy and linearity and response time of the PO(2) calibration are limited only by those of the absolute pressure sensor. The temperature sensitivity of a commercial sensor and a means of correction are also described.

Original publication

DOI

10.1088/0967-3334/31/4/N02

Type

Journal article

Journal

Physiol Meas

Publication Date

04/2010

Volume

31

Pages

N25 - N33

Keywords

Calibration, Equipment Design, Equipment Failure Analysis, Fiber Optic Technology, Oximetry, Reproducibility of Results, Sensitivity and Specificity, Transducers