| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 751138 | Sensors and Actuators B: Chemical | 2010 | 4 Pages |
Abstract
We introduce the application of a differential microphone in an LED-excited photoacoustic system devoted to NO2 measurement. The microphone ports pick up out-of-phase signals generated in two resonators, thus achieving a larger electrical signal and good common mode noise rejection. The reduced noise floor and LEDs with higher optical power, made it possible to measure NO2 down to 60 ppbV, a figure that enables quantifying the amount of such a gas produced by gasoline engines equipped with catalytic converter.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
René Bernhardt, Guillermo D. Santiago, Verónica B. Slezak, Alejandro Peuriot, Martín G. González,