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This paper reports on the optical detection system of a prototype nitrite sensor for seawater analysis. The sensor uses a colorimetric Griess reaction that produces an Azo dye with an absorption peak at 540 nm. A simple low-cost double beam spectrophotometer using a green light emitting diode (LED) light source, two integrated photo detectors and lock-in detection is described. A log-ratio amplifier...
In this paper we show how adaptive line enhancer is used in single cell impedance measurement to remove noise. ALE can deccorrelate and remove broadband noise from raw experimental data, improving the signal-to-noise ratio of the system. This improvement is significant for multi-frequency measurements using pseudorandom noise stimulation. The noise-polluted impedance signal of single human red blood...
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