Our specifications use the terms “low” and “high” oxygen concentrations. In determining resolution, what oxygen concentration separates “low” from “high”?
The output of the probe (in terms of voltage or fluorescent intensity) is a non-linear function described by the Stern-Volmer equation. The probe is more sensitive at low concentrations. The sensitivity is shown below for units in gas and water, assuming a photometric signal-to-noise ratio of 1800:1. This represents a “typical” setup, averaging across 200 pixels in the fluorescence peak that is about 1800 counts for zero oxygen and 1000 counts for the high standard. A better signal-to-noise ratio can be realized by averaging through time, but at the expense of the sampling frequency.
Related Questions
- Our specifications use the terms "low" and "high" oxygen concentrations. In determining resolution, what oxygen concentration separates "low" from "high"?
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