A low-resolution spectrometer for open-path Fourier-transform infrared spectrometry

A novel open-path Fourier-transform infrared (OP-FTIR) spectrometer has been designed and constructed. The spectrometer differs from conventional OP-FTIR spectrometers in that it uses a low-resolution interferometer and a deuterated λ-alanine-doped triglycine sulfate detector. The system also incorporates separate transmitting and receiving telescopes, the mirrors of which are fabricated from spin-cast epoxy resin, and a lateral transfer hollow retroreflector. The use of these components allows for a lighter, more rugged and robust system that can easily be employed for remote sensing/continuous monitoring for both outdoor (fence line or traditional) and indoor environments. Advantages over contemporary instruments were found in weight, cost, and utility. © 1999 John Wiley & Sons, Inc. Field Analyt Chem Technol 3: 131–138, 1999