We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK


97% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > A field-portable, laser-diode spectrometer for ...
View graph of relations

« Back

A field-portable, laser-diode spectrometer for the ultra-sensitive detection of hydrocarbon gases

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>04/2002
<mark>Journal</mark>Journal of Modern Optics
Number of pages8
<mark>Original language</mark>English


We have developed a field-portable optical gas sensor for the ultra-sensitive detection of ethane. The system is based on an adaptation of a commercially available system, which uses a cryogenically cooled, lead-salt laser diode at 3.34 mum and a multi-pass astigmatic Herriott sample cell. We have adapted this system to a second derivative wavelength modulation scheme giving a lower detection limit of less than 100 parts per trillion for a one second measurement time. Our custom-designed software controls every aspect of the instrument operation from spectral scanning of the laser diode, to automatic calibration, optical alignment, spectral analysis and complete data logging.

Bibliographic note

15th National Quanturn Electronics and Photonics Conference, GLASGOW, SCOTLAND, SEP 03-06, 2001