SEMTECH - LASAR0 pages

Emissions
Measurement
Solutions

sensors

SEMTECH - LASAR
®

Laser Absorption Spectroscopy with Amplified Resonance

On Board
Emissions
Analyzers

Test Cell
Emissions
Analyzers

Emissions
Testing
Services

Environmental
Applications

The SEMTECH® LASAR combines extremely high
optical resolution optical feedback, cavity enhanced,
scanning laser absorption spectrometry with very low
pressure sampling for the measurement of emission
gases over wide dynamic ranges. The use of a hyperreflective gas cell in conjunction with laser light
sources (TDL or QCL) enables kilometric pathlength,
delivering enhanced sensitivity. The wide spectral
range scanning laser provides access, every 100
milliseconds, to up to 400 data-points spectra
including information on several gases, real-time
detection of interferences, and zero information for a
no zero-drift response. Optical feedback enhances
the purity of the laser beam injection in the gas cell by
as much as 100x, enabling optical resolutions as low
as 0.005 cm-1. When combined with very lowpressure sampling, absorption bands are narrowed
(no overlap); this results in zero-interference
measurements. Very low pressure sampling and very
low internal dead volume (e.g. 25 mL gas cell) enables
faster system response times. In addition to the
native 10 Hz electronic response rate, sample transfer
speed in sampling can be as high as 4 m.s-1 and sweep
time of the entire system of less than 1 second.
The SEMTECH® LASAR was designed with no moving parts, hygroscopic optics or liquid N2
cooling requirements. It was integrated to maintain measurement integrity in presence of
significant Electro-Magnetic Interference (EMI), vibration, and shock, enabling wide applicability.
Sample conditioning is deported to the sampling point using a lightweight, low flow rate Dual
Stage Heated Filter (DSHF) sampling assembly. Deporting the filtration unit to the sampling point
increases sampling accuracy. Low flow rate requirements allows for small engine testing without
slowing down rise/fall times.
The SEMTECH® LASAR is operated from a local host software including all customary analytical
and diagnostic functions expected from an emissions gas analyzer. The system can also be
connected to a remote host and operated from this host using familiar AK-commands.
The SEMTECH® LASAR is 40 CFR part 1065 and Euro VI (draft) compliant for the gases regulated
under these rules.