D3.2 Simultaneous Signal Acquisition by Synchronous Detection of Orthogonal Frequency Components
- SMSI 2021
2021-05-03 - 2021-05-06
- SMSI 2021 - Measurement Science
- D3 Measurement Foundations II
- M. Baer, B. Schmauss - Erlangen Graduate School for Advanced Optical Technologies, Erlangen (Germany), P. Demosthenous - Cyprus Research & Innovation Center Ltd., Nicosia (Cyprus)
- 254 - 255
We describe a multiplexing technique to simultaneously measure the absorption properties of gas at two different wavelengths using just one photodetector and an orthogonal frequency synchronous detection technique with non-sinusoidal modulation. This concept is demonstrated in a near infrared (NIR) spectroscopic application, measuring ethanol vapor in air.