LED based photoacoustic NO$_2$ sensor with sub-ppb detection limit
2021
An LED based photoacoustic NO$_2$ sensor is demonstrated. A high sensitivity is reached with cantilever-enhanced sensing and a white-light LED. To counteract issues arising from background drifts, the LED spectrum is divided into two channels for a relative measurement. Noise level below 1 ppb is reached with an averaging time of 70 s.
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