OP-FTIR: Open Path Spectrometer for Air Quality Monitoring PRODUCT DESCRIPTION The OP-FTIR is a low-cost, compact, ruggedized, Open-Path Fourier Transform Infrared (OP-FTIR) spectrometer system. The system is designed to work in the informationrich 7 to 14 micron region with 8 cm-1 spectral resolution. This resolution is specifically tailored for identifying and quantifying heavy industrial solvent molecules with comparable selectivity and better sensitivity than a highresolution (Δσ<1 cm-1) spectrophotometer. The new OP-FTIR system combines low manufacturing cost with high sensitivity in a rugged, fieldable instrument. The sensitivity increase offered by our low spectral resolution design permits the use of an uncooled pyroelectric detector in place of the more traditional cryogenically-cooled mercury cadmium telluride detector. Algorithms tailored for use with low resolution spectra maintain system specificity without sacrificing overall sensitivity. System bulk and complexity are further reduced through the use of a novel encoder-based metrology system that replaces the Helium-Neon laser interferometer used in most FTIR systems The system includes algorithms to automatically compute concentration x path length products for multiple molecular species from the measured spectra, allowing for autonomous, stand-alone operation. A low cost plastic press-molded retroreflector array for use in place of the typical hollow glass corner cube retroreflector array is available as an option. OPTRA is a large scale provider of chemical agent detection sensors for the military marketplace and a small scale provider of innovative environmental solutions. The OP-FTIR Spectrometer Module ADVANTAGES • Broad range of target gasses • Long Open Path Range: 100m • High signal-to-noise • Uncooled detector • Light weight: <7kg including telescope • On-board black-body calibration • Discrimination algorithms included • Full technical support; customization available APPLICATIONS • Industrial monitoring • Air quality monitoring • Threat detection • HVAC monitoring • In situ process monitoring OP-FTIR TECHNICAL SPECIFICATIONS The standard OP-FTIR Spectrometer Module includes a 150mm telescope and a modulator assembly which includes the interferometer, detector, IR source and reference system. Optional accessories include a Portable PC and a Retroreflector Array, which can be built to customer’s specifications. Functional Specifications SPECIFICATION VALUE Spectral Range 714 to 1428 cm-1 Spectral Resolution 8 cm-1 Integration time (single scan) 1.25 s Open path range 1 to 100 m Operational Specifications SPECIFICATION VALUE Temperature range 20 to 30 ºC Spectral Range Physical Specifications 800 SPECIFICATION Size: Spectrometer module PC VALUE 26.7 x 21.6 x 18.4 cm 40.9 x 28.2 x 23.1 cm Retroreflector array per customer spec Weight: Spectrometer module 6.35 kg 700 600 500 400 300 200 100 PC 12.7 kg 0 600 800 1000 1200 1400 1600 1800 2000 optical frequency (cm-1) CO2 Laser Spectrum Optional Portable PC and Retroreflector Array 900 910 920 930 940 950 960 970 980 990 1000 optical frequency (cm-1) All specifications are subject to change without notice. OPTRA, Inc. 461 Boston St. Topsfield, MA 01983 978-887-6600 FAX: 978-887-0022 info@optra.com or http://:www.optra.com OP-FTIR.doc 10/25/04