Institute of Meteorology and Climate Research

Embedded digital data processing for diode laser spectroscopy

For our compact and lightweight laser spectrometers we have developed in collaboration with the KIT Institute for Data Processing and Electronics (IPE) a dedicated all-digital data acquisition and handling system that combines all requirements we have for autonomous spectrometer deployment aboard passenger and research aircraft:

1. Low Noise
  • Entire system optimized for low noise operation
  • Near shot noise limited measurements (demonstrated with near-infrared DFB laser at 1.39 microns)

2. All-digital data processing

  • Direct absorption spectroscopy 
  • Wavelength modulation spectroscopy with software lock-in amplifiers
  • Cavity enhanced absorption spectroscopy
  • Photoacoustic spectroscopy

3. Compact

  • Four Euro-card sized electronics boards
  • Embedded PC
  • Laser driver included

The system is presently deployed in the latest generation of the ISOWAT H2O isotope-ratio laser spectrometer.

 

Fig. 1: All-digital data acquisition and handling unit for diode-laser spectrometer