The ARCoptix FTIR spectrometer GASEX OEM module represents a highly efficient, rugged and fully integrated solution for gas spectroscopy in our product portfolio. Our OEM010 module is coupled to a low volume (0.2L) heated (up to 200°C) gas cell, in which light experiences multiple reflections, resulting in an integrated optical path of 5m with more than 50% transmission (or 20cm in the short cell configuration). The cell's internal optics is rhodium and gold coated, making it extremely resistant against most chemicals including acid gases such as HF, HCl, HBr, and many other gases like CO,CO2, NO, NO2, NH3, SO2,NOx, CH4, VOC's,...

GASEX OEM with 5m long cell

GASEX OEM with 20cm long cell

The GASEX OEM has been standardized to operate with a resolution of 0.5cm-1, which makes it compliant with the newest legal regulations for emission measurements. Featuring a USB 3.0 connection, the unit can also host an embedded single-board computer with Ethernet connection for standalone operation. Typical limit of detection (LoD) are below 1 ppm for most of the gases - with 20s integration time.

Characteristics

• Optimized Gas cell and FTIR Assembly
• Compact and rugged
• Resolution of 2 cm^-1 down to 0.5 cm^-1
• MCT Detector with high detectivity TE-cooled MCT detector 5000-830 cm^-1 (2-12μm)
• 5m heated gas cell with small volume (0.2L)
• USB connectivity and SDK available
• Cost effective

Example

 

The Gasex system consist of an interferometer module including also the MCT detector and an IR light source and a Multi-reflection gas cell. The light is produced by a black body radiation module and modulated by a dual corner cube interferometer.The light is then coupled into the Gas cell (where the gas to be analysed is injected) where it is relfected back and forth 32 times. Finally the light focused on the MCT detector.

The heart of the FT-Rocket is dual corner-cube (retro-reflector) interferometer. The two corner-cubes are solidary to a common swinging arm, which rotates to create an optical path difference in the two arms of the interferometer.
This type of design is called a permanently aligned interferometer, as the alignment of the system is known to be the most robust against vibrations and temperature drifts. It never has to be realigned.
The swinging arm of the interferometer rotates on wear-free flexure system, making this mechanical system extremely robust and durable.

Solid-state reference laser

For measuring the movement of the mirrors, a solid-state reference laser is coupled into the interferometer. Compared to classic HeNe lasers, the solid-state lasers that we use are more compact and have a much longer life-time. They have a very low temperature-induced wavelegnth drift and, when kept at constant temperature with a Peltier element, their wavelength can be stabilized to a few PPM, thus providing a very accurate and reproducible wavelength scale. This is crucial for ensuring a day-to-day and unit-to-unit consistency..