Detect H2O in real time & in situ with up to ppb precision
Water Vapour
Major applications
nanoplus lasers detect water vapour in numerous applications, such as in gas pipelines, for climate monitoring or combustion control as well as for isotope detection on Mars with the NASA's Curiosity Rover.
Tunable diode laser spectroscopy allows measuring H2O with up to ppb precision in real time and in situ. Providing long-term stability and requiring little maintenance, nanoplus lasers are suitable for operation in harsh environments.

Which absorption line is the perfect one for your application?
Typical wavelengths
Select your target wavelength
nanoplus offers various wavelengths to target the vibrational-rotational bands of water vapour. Select the target wavelength that fits your application best.
The literature recommends several options. They are illustrated in the graphic on the right, which shows the relative intensities of the possible absorption lines. To define the most suitable H2O wavelength for your application, you may have a look at our literature recommendations below or refer to the HITRAN database from the Smithsonian Institute.
We present the most common Distributed Feedback lasers for H2O detection below. Learn more about their specifications.
935 nm
1392 nm
1854 nm & 1877 nm
2682 nm

Factors which you should consider in your setup
Above wavelengths as well as further customized wavelengths for water vapour detection are available from nanoplus.
When you choose your wavelength, you have to consider your product set up, environment and nature of the measurement.
These factors influence the optimum wavelength for your application. Do have a look at the Hitran Database to further evaluate your choice of wavelengths. Our application experts are equally happy to discuss with you the most suitable wavelength for your application.
Let us know the wavelength you require with an accuracy of 0.1 nm!