Differential, LED-excited, resonant NO2 photoacoustic system

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 nois...

Full description

Saved in:
Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2010-10, Vol.150 (2), p.513-516
Main Authors: Bernhardt, Rene, Santiago, Guillermo D, Slezak, Veronica B, Peuriot, Alejandro, Gonzalez, Martin G
Format: Article
Language:English
Subjects:
Actuators
Automotive components
Electric power generation
Exhaust systems
Microphones
Nitrogen dioxide
Noise
Rejection
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 60ppbV, a figure that enables quantifying the amount of such a gas produced by gasoline engines equipped with catalytic converter.
ISSN:0925-4005
DOI:10.1016/j.snb.2010.09.007