P1.9.19 Digital MEMS Microphone with Inter-IC Sound Interface for Photoacoustic Spectroscopy
- Event
- 14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
Nürnberg/Nuremberg, Germany - Chapter
- P1.9 Technology and Application
- Author(s)
- H. Bruhns, A. Marianovich, S. Rhein, M. Wolff - Hamburg University of Applied Sciences, Institute for Physical Sensors (Germany)
- Pages
- 1217 - 1219
- DOI
- 10.5162/IMCS2012/P1.9.19
- ISBN
- 978-3-9813484-2-2
- Price
- free
Abstract
In Photoacoustic Spectroscopy that is adopted for gas sensing, standard condenser microphones are usually used
to detect the pressure variation inside of the sample cell. We present the application of a new commercial I2S digital
MEMS microphone that is enhanced with a filter and an analog to digital converter in a single package. The utilisation of the described MEMS microphone together with an embedded microcontroller would significantly reduce the required space and costs for the components needed to realise the signal detection path of the spectrometer. We present an initial estimation of the improvements regarding sensitivity, signal-to-noise ratio and dynamic range on the base of the MEMS microphone's data sheet compared with the conventional signal path with a capacitive microphone, a microphone preamplifier and a lock-in amplifier.