Ammonia Detection (NH3)

Importance of laser-based ammonia detection

nanoplus lasers for carbon dioxide detection are used for:

  • Process Optimization: Emission control
  • Health: Breath gas analysis

Tunable diode laser spectroscopy allows measuring NH3 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.

Standard wavelengths for ammonia detection

nanoplus offers various wavelengths to target the vibrational-rotational bands of ammonia. Different customers use different wavelengths. Literature recommends the following wavelengths for ammonia detection:

Select your wavelength for ammonia detection

Above wavelengths are commonly used to detect ammonia. When you choose your wavelength, you have to consider product set up, environment and nature of the measurement. These factors decide if the selected wavelength is a good match. Let us know the wavelength you require with an accuracy of 0.1 nm!

Do have a look at the HITRAN database to evaluate further wavelengths.

Figure 1: Absorption features of ammonia in 760 nm to 6000 nm range
Absorption features of ammonia in 760 nm to 6000 nm range

Related information for laser-based ammonia detection

Specifications & Mountings


Papers & Links

The following tables analyse the typical specifications of the standard wavelengths for NH3 detection.

electro-optical properties of
1512.0 nm DFB laser diode
standard wavelengthλnm1512.0
absorption line strengthScm / mol∼ 4 x 10-22
output powerpoutmW5710
threshold currentlthmA102030
current tuning coefficientcTnm / mA0.0080.0150.02
temperature tuning coefficientcInm / K0.070.10.14
mode hop free tuning rangeΔλnm+/- 0.5+/- 0.7+/- 1
electro-optical properties of
3000.0 nm DFB interband cascade laser
standard wavelengthλnm3000.0
absorption line strengthScm / mol∼ 4 x 10-20
threshold currentlthmA50
output powerpoutmW> 1
current tuning coefficientcTnm / mA0.2
temperature tuning coefficientcInm / K0.3
mode hop free tuning rangeΔλnm+/- 0.5
mounting options /
technical drawings
wavelengthTECcap with windowAR cap with AR windowfiberheatsinkcollimation
TO5.6 760 nm - 3000 nmNANANANANA
TO5 760 nm - 3000 nmNANA
TO663000 nm - 6000 nmNANA
c-mount 760 nm - 3000 nmNANANANANANA
SM-BTF760 nm - 2360 nmNANAsingle modeNANA
PM-BTF1064 nm - 2050 nmNANApolarization maintainingNANA

Ask for further packages.

Please find below a number of application samples.

Emission control of NOx:
NH3 is added in combustion processes to reduce emissions of the flue gas NOx. The two compounds will react to uncritical N2 and H2O. To avoid any corrosive or environmental effects from overuse, the gas volume needs to be continuously monitored. [3, 72]

Monitoring of breath gas:
Ammonia is used as a biomarker for helicobacter pylori infections. These infections are responsible for stomach ulcers. Breath analysis diagnoses the disease in a non-invasive way sparing patients a disagreeable gastroscopy. [63]

Please find below a selection of related papers from our literature list.

Let us know if you published a paper with our lasers. We will be happy to include it in our literature list.

#3 Gas monitoring in the process industry using diode laser spectroscopy;
I. Linnerud, P.Kaspersen, T. Jaeger, Appl. Phys. B 67, 1998, pp. 297-305.

#9 DFB Lasers Between 760 nm and 16 µm for Sensing Applications;
W. Zeller, L. Naehle, P. Fuchs, F. Gerschuetz, L. Hildebrandt, J. Koeth, Sensors 2010, 10, pp. 2492-2510.