A wide range oxygen sensing strategy with the collaboration of multiple phosphorescence probes

Abstract

A wide range oxygen measurement system with the relative measurement error of less than 1.5% across 4 orders of magnitude of oxygen dynamic range has been developed. We proposed a theoretical evaluation method of the measurement capability of oxygen probes, which points that the relative measurement error (δ) is equal to the reciprocal of the product of signal-to-noise ratio (SNR) and relative sensitivity (S r). A minimum value point in the curve of δ with oxygen concentration is existing due to the opposite trends of SNR and S r Based on the evaluation results, an oxygen probe group was selected scientifically for wide range oxygen measurement. The efficacy of the developed measurement system, featuring adaptive oxygen probe switching, was verified through testing, confirming its compliance with accuracy requirements for measurements.