Focus on Sensor Technology - Gas Detection 31
Sensors chosen for Croatian National Weather Observation Network modernisation project
NEW Mid-infrared light-emitting diodes (MIR LED) from 2800 nm to 6500 nm for gas sensing
Figure 1: Spectrum of a nanoplus 4.3 µm Mid-Infrared LED
Biral is supplying 34 of its VPF-750 sensors to the Croatian Meteorological and Hydrological Service, a government body that supports the country’s economic and sustainable development.
The strategic modernisation of the National Weather Observation Network in Croatia, METMONIC project will establish a modern and high-quality system of automatic surface meteorological stations, meteorological- oceanographic buoys and remote measurement systems, including meteorological radars.
Biral partner CGS Labs led the project locally to install 34 VPF-750s which form part of the more than 400 modern automatic meteorological systems to provide traceable, reliable and high- quality information on the status of the atmosphere and sea around the Republic of Croatia.
With these in place, those monitoring the data are able to view changes to the weather and climate and see improved early warnings of hazardous conditions, with analysis of the current meteorological observation network confi rming the need to increase the availability of measured climate variables as well as the analyses of climate conditions.
The VPF-750 Visibility and Present Weather sensor is the most advanced in Biral’s product range. Its enhanced performance allows the reporting of freezing precipitation in addition to the weather codes typically available from a forward scatter sensor.
The sensor is designed for use in aviation applications where extended weather information, including past weather, is required for inclusion in METAR reports. The sensor is also well suited to research applications and use in meteorological observation networks. The unique backscatter receiver combined with accurate external temperature, humidity and precipitation sensors gives the VPF-750 unparalleled abilities in distinguishing frozen from liquid precipitation, with the added advantage of identifying freezing precipitation. The sensor reports both WMO table 4680 and METAR codes to simplify integration to host systems. A wealth of other data is provided including a transmissometer equivalent EXCO.
Nathan Neal, Sales and Marketing Director at Biral, said: “This is a great project for Biral and we are very pleased to be working on it in partnership with our friends from CGS Labs to improve early warnings to severe weather and contributing to the development of human, technical and scientifi c capacities in order to help Croatia achieve sustainable development.
“The reliability and measuring accuracy of our sensors leads the way in often diffi cult applications, so we are happy to be involved and helping to modernise current components to make it easier to access archives and databases and accompanying infrastructure.”
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Figure 2: Power, voltage and current characteristics of a nanoplus 4.3 µm Mid-Infrared LED
nanoplus presents continuous-wave Mid-Infrared LEDs (MIR LED) at any customised wavelength between 2800 nm and 6500 nm. The devices feature continuous-wave operation at room temperature, little power consumption, and a relatively small spectral bandwidth. With these specifi cations, they are a broadband, incoherent and cost-effective alternative to lasers for many gas sensing applications. Portable detectors especially will benefi t from their high wall-plug effi ciencies. The mid-infrared LEDs are available on ceramic sub-mount or printed circuit board (PCB).
Read more about the MIR LED specifi cations at
https://nanoplus.com/MIRLED.
The wavelength window between 3 µm and 6 µm is a key for high-precision gas analysis based on tunable diode laser absorption spectroscopy (TDLAS). Many trace gases ubiquitous to industrial sites have their strongest absorption bands in this region. They show absorption strengths that are several orders of magnitude higher than those in other infrared areas. This concerns prevalent molecules such as carbon dioxide (CO2
), nitric oxide (NO), or water (H2 hydrocarbons, such as methane, ethane, or acetylene, equally locate their topmost absorbing features at these mid-infrared wavelengths.
Trace gas analysers that take advantage of the molecules’ strongest absorption bands benefi t from a higher detection accuracy, accelerated sensing speed, less noise, and, last but not least, a smaller footprint. As a laser expert for TDLAS-based gas sensing, nanoplus offers a variety of light sources to industry and research.
The nanoplus fl agship product is Distributed Feedback Interband Cascade Lasers (DFB ICL). They are available at any target wavelength between 2800 nm and 6500 nm and have an extremely narrow linewidth of typically < 0.1 nm. At top-rated wavelengths, they show output powers up to 10 mW.
Very recently nanoplus introduced high-power Fabry-Pérot lasers in the mid-infrared. The multimode devices reach up to 1 W at wavelengths between 1950 nm and 2350 nm. They are packaged on a submount with an AlN carrier. Possible applications include the medical sector, pumping of solid-state lasers, or materials processing.
Finally, Superluminescent Diodes (SLD) complete nanoplus portfolio of light sources in the mid-infrared. Designed at any customized wavelength from 760 nm to 2900 nm these broadband devices combine the proven beam quality of nanoplus DFB lasers with the large spectrum of LEDs.
nanoplus is a fully vertically integrated company. They control the entire process chain from design to the packaging at their two ISO 9001:14001 certifi ed production sites in Germany. This enables them to provide customized solutions for any client. Do not change your ideas, let them deliver a light source that fi ts your application.
More information online:
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YOU KNOW …
our Distributed Feedback Laser Diodes (DFB) from 760 nm to 2900 nm and our Interband Cascade Lasers (ICL) from 2800 nm to 6500 nm.
… BUT DO YOU KNOW OUR …
continuous wave NEW! MIR-LEDs
from 3 µm to 6 µm
nanoplus.com/MIRLED
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