Hydrogen Sulfide Detection (H2S)

Importance of laser-based hydrogen sulfide detection

nanoplus lasers for hydrogen detection are used for:

  • Process Optimization: Corrosion surveillance
  • Safety: Emission control

Tunable diode laser spectroscopy allows measuring H2S 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 hydrogen sulfide detection

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

Select your wavelength for hydrogen sulfide detection

Above wavelengths are commonly used to detect hydrogen sulfide. 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 hydrogen sulfide in 760 nm to 6000 nm range
Absorption features of hydrogen sulfide in 760 nm to 6000 nm range

Related information for laser-based hydrogen sulfide detection

Specifications & Mountings


Papers & Links

The following tables analyse the typical specifications of the standard wavelengths for H2S detection.

electro-optical properties of
1590.0 nm DFB laser diode
standard wavelengthλnm1590.0
absorption line strengthScm / mol∼ 1 x 10-22
output powerpoutmW5710
threshold currentlthmA102530
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
2640.0 nm DFB laser diode
standard wavelengthλnm2640.0
absorption line strengthScm / mol∼ 3 x 10-21
output powerpoutmW2
threshold currentlthmA305080
current tuning coefficientcTnm / mA0.010.020.05
temperature tuning coefficientcInm / K0.150.20.28
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.

Control of hazardous gases:
H2S occurs as a corrosive, toxic and explosive side product in the petrochemical industry. Continuous monitoring of this hazardous compound is critical to avoid corrosion of natural gas pipelines and ensure workers safety. Real-time analysis is essential to guarantee that burning fuels are H2S clean in order to prevent acid rains. [3, 69, 76]

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.

#69 A quartz-enhanced photoacoustic sensor for H2S trace-gas detection at 2.6µm;
S. Viciani, M. Siciliani de Cumis, S. Borri, P. Patimisco, A. Sampaolo, G. Scamarcio, P. De Natale, F. D'Amato, V. Spagnolo, App. Phys. B, 2015, 119, pp. 21-27.

#76 Diode laser-based trace detection of hydrogen-sulfide at 2646.3 nm and hydrocarbon spectral interference effects;
R. Sharma, C. Mitra, V. Tilak, Opt. Eng. 55(3), 037106, Mar 14, 2016.