Technology

Recent advances in laser technology and engineering breakthroughs enabled LI-COR to develop the LI-7700 Open Path CH₄ Analyzer. The LI-7700 uses a single-mode tunable laser source, which operates at ambient temperature, to measure methane in-situ with Wavelength Modulation Spectroscopy (WMS). In contrast to ICOS and WS-CRDS, this technology uses a relatively short path length, the measurement is resistant to the effects of contaminants in the optics, and it makes the open path configuration possible. Innovative features, such as automated mirror cleaning, help ensure continuous data collection and provide low cost-of-ownership by reducing maintenance requirements.

Both the LI-7500A and the LI-7200 make precise, accurate, and fast CO₂/H₂O measurements using Non-Dispersive Infrared (NDIR) detection. NDIR has consistently proven to be an excellent technology for measuring CO₂ and H₂O at high frequencies, with high precision and low power consumption. In the 24 years since we introduced our first precision NDIR sensor, we have continuously worked to improve the measurement technology. The results of this ongoing effort are apparent in the data that our analyzers provide.