As the world's leading manufacturer of supercontinuum sources over the last 15 years, NKT Photonics will present the applications that have driven the supercontinuum technology forward: From the earliest introduction in commercial microscopes to the most recent industrial applications in highly demanding industries like semiconductor metrology. Over the years, the supercontinuum technology has made the development of several state-of-the-art applications possible, e.g. confocal microscopy, FLIM, STED, OCT, etc.. The supercontinuum technology started in research lab applications but is now mature and reliable and can be used in a wide variety of industrial process monitoring applications.
A micro differential thermal analysis (DTA) system is used for detection of trace explosive particles. The DTA
system consists of two silicon micro chips with integrated heaters and temperature sensors. One chip is used for
reference and one for the measurement sample. The sensor is constructed as a small silicon nitride membrane
incorporating heater elements and a temperature measurement resistor. In this manuscript the DTA system
is described and tested by measuring calorimetric response of 3 different kinds of explosives (TNT, RDX and
PETN). This project is carried out under the framework of the Xsense project at the Technical University of
Denmark (DTU) which combines four independent sensing techniques, these micro DNT sensors will be included
in handheld explosives detectors with applications in homeland security and landmine clearance.
Realizing that no one sensing principle is perfect we set out to combine four fundamentally different sensing principles
into one device. The reasoning is that each sensor will complement the others and provide redundancy under various
environmental conditions. As each sensor can be fabricated using microfabrication the inherent advantages associated
with MEMS technologies such as low fabrication costs and small device size allows us to integrate the four sensors into
one portable device at a low cost.
A micro differential thermal analysis (DTA) system is used for detection of trace explosive particles. The DTA
system consists of two silicon micro chips with integrated heaters and temperature sensors. One chip is used
for reference and one for the measurement sample. The sensor is constructed as a small silicon nitride bridge
incorporating heater elements and a temperature measurement resistor. In this manuscript the DTA system is
described and tested by measuring calorimetric response of DNT (2,4-Dinitrotoluene). The design of the senor is
described and the temperature uniformity investigated using finite element modelings and Raman temperature
measurements. The functionality is tested using two different kinds of explosive deposition techniques and
calorimetric responses are obtained. Under the framework of the Xsense project at the Technical University of
Denmark (DTU) which combines four independent sensing techniques, these micro DNT sensors will be included
in handheld explosives detectors with applications in homeland security and landmine clearance.
In an effort to produce a handheld explosives sensor the Xsense project has been initiated at the Technical University of
Denmark in collaboration with a number of partners. Using micro- and nano technological approaches it will be
attempted to integrate four detection principles into a single device. At the end of the project, the consortium aims at
having delivered a sensor platform consisting of four independent detector principles capable of detecting concentrations
of TNT at sub parts-per-billion (ppb) concentrations and with a false positive rate less than 1 parts-per-thousand. The
specificity, sensitivity and reliability are ensured by the use of clever data processing , surface functionalisation and
nanostructured sensors and sensor surfaces.
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