Formaldehyde Detection (CH2O)
Importance of laser-based formaldehyde detection
nanoplus lasers for formaldehyde detection are used for:
- Safety: Workplace exposure monitoring
Tunable diode laser spectroscopy allows measuring CH2O 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 formaldehyde detection
nanoplus offers various wavelengths to target the vibrational-rotational bands of formaldehyde. Different customers use different wavelengths. Literature recommends the following wavelengths for formaldehyde detection:
Select your wavelength for formaldehyde detection
Above wavelengths are commonly used to detect formaldehyde. 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.
Related information for laser-based formaldehyde detection
Specifications & Mountings
Papers & Links
The following tables analyse the typical specifications of the standard wavelengths for CH2O detection.
|electro-optical properties of|
3560.0 nm DFB interband cascade laser
|absorption line strength||S||cm / mol||∼ 6 x 10-20|
|output power||pout||mW||> 1|
|current tuning coefficient||cT||nm / mA||0.2|
|temperature tuning coefficient||cI||nm / K||0.3|
|mode hop free tuning range||Δλ||nm||+/- 0.5|
|mounting options /|
|wavelength||TEC||cap with window||AR cap with AR window||fiber||heatsink||collimation|
|TO5.6||760 nm - 3000 nm||NA||✔||NA||NA||NA||NA|
|TO5||760 nm - 3000 nm||✔||NA||✔||NA||✔||✔|
|TO66||3000 nm - 6000 nm||✔||NA||✔||NA||✔||✔|
|c-mount||760 nm - 3000 nm||NA||NA||NA||NA||NA||NA|
|SM-BTF||760 nm - 2360 nm||✔||NA||NA||single mode||NA||NA|
|PM-BTF||1064 nm - 2050 nm||✔||NA||NA||polarization maintaining||NA||NA|
Please find below a number of application samples.
Workplace exposure monitoring:
Formaldehyde has been used in consumer and industrial products since the beginning of the 19th century. Currently the annual formaldehyde production accounts for 21 million tons. About 50 % are processed as adhesives in pressed wood panels. In 2004 formaldehyde has been classified carcinogenic by the International Agency for Research on Cancer. Since then formaldehyde concentrations have been strictly controlled in the production process as well as in the finished product. Laser-based measurement systems are required to detect the maximum levels of 0.01 ppb (USA) and 2 ppb (EU). [9, 22, 78]
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.
#2 Advanced Gas Sensing Applications Above 3 µm with DFB Laser Diodes;
L. Naehle, L. Hildebrandt, M. Fischer, J. Koeth, Gases & Instrumentation, March/April 2012, pp. 25-28.
#5 DFB lasers exceeding 3 µm for industrial applications;
L. Naehle, L. Hildebrandt, Laser+Photonics 2012, pp. 78-80.
#7 DFB laser diodes expand hydrocarbon sensing beyond 3 µm;
L. Hildebrandt, L. Naehle, Laser Focus World, January 2012, pp. 87-90.
#8 ICLs open opportuneties for mid-IR seinsing;
L. Naehle, L. Hildebrandt, M. Kamp, S. Hoefling, Laser Focus World, May 2013, pp. 70-73.
#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.
#22 Sensing of formaldehyde using a distributed feedback interband cascade laser emitting around 3493 nm;
S. Lundqvist, P. Kluczynski, R. Weih, M. von Edlinger, L. Naehle, M. Fischer, A. Bauer, S. Hoefling, J. Koeth, Appl. Opt., 51, 25, 2012, pp. 6009-6013.
#36 Single mode interband cascade lasers based on lateral metal gratings;
R. Weih, L. Naehle, Sven Hoefling, J. Koeth, M. Kamp, Appl. Phys. Lett., 105, 7, 2014, pp. 071111.
#63 Breath Analysis Using Laser Spectroscopic Techniques: Breath Biomarkers, Spectral Fingerprints, and Detection Limits;
C. Wang and P. Sahay, Sensors 2009, 9, 8230-8262.
#78 Ppb-level formaldehyde detection using a CW room-temperature interband cascade laser and a miniature dense pattern multipass gas cell;
L. Dong,Y. Yu,.C. Li, S. So, F. Tittel, Optics Express Vol. 23, Issue 15, 2015, pp. 19821-19830.