SPECTRASENSORS
TDL GAS ANALYSERS
SpectraSensors NIR Laser
Gas Measurement Technology
The concept of
Near Infra Red (NIR) to measure gases
is well established, and has been widely used in academia and industry. The principle
involves concentrating NIR light at a harmonic wavelength of the measurand molecule.
The molecule will absorb energy from the light and vibrate at very specific
frequencies. The resultant
loss of energy from the NIR beam can be measured with a simple detector, and
using the Beer Lambert law the content determined.
Until now there has only been very limited success using this technique to measure
trace moisture in gas. Most of the problems have been 'source' related, with
only broad band sources link halogen lamps or hot wires available.
NASA and the JPL (Jet Propulsion Laboratory) worked hard on the problem
for many years to make upper atmospheric measurements. The result of
their labours is the 'Tunable Diode Laser', a precise, intense and reliable source
of NIR light. Using smart signal processing techniques, such as 2F demodulation,
used to detect faint radio signals, these analysers can measure very low levels
of moisture very accurately with no drift. The technology was 'handed over' to SpectraSensors where it is now commercially available.
As the measurand no longer has to absorb on or desorb from the measuring sensor
contamination is now significantly reduced as a problem, and also the speed of
response is now un-precedented. With a wide range of choices in wetted parts highly
corrosive gases can easily be handled. Near Infra Red measurement is a fundamental
principle, and so the system offers very high standards accuracy. The narrow
band width of the laser means the analyser is highly specific, so for
applications like Natural Gas there is no effect from contaminates like Glycol, condensates and H2S.
This system is truly
a breakthrough!
The analyser comes in three configurations:
Contact:
sales@ima.co.uk
+44 1943 878877