Portable Raman System
When detecting Raman
scattering, the sample's fluorescence can be a large non-Raman signal
source. Since the fluorescence signal is also shifted from the laser frequency,
it can be difficult to filter it out. Fortunately, fluorescence can be
reduced by using a longer wavelength laser as the excitation source. 785nm
laser has been the main excitation source for Raman spectroscopy, because
it produces relatively low fluorescence and the photodector array is widely
available in this wavelength range. Recently, the InGaAs photodector array
has been commercialized which extends the range of wavelength detection
to 1-2mm. Coupling the InGaAS photodetector with a 1064nm laser excitation
source reduces interference from fluorescence. The following shows the
Raman spectrum of motor oil with 785 and 1064 nm laser respectively.
throughput, slitless spectrograph with no moving optical or mechanical
parts. Two spectrograph models: short-range (SR) and long-range (LR).
250 - 1000 cm-1
LR version: 250 - 1800 cm-1
version: 6- 8cm-1 (FWHM)
LR version: 10-14
600 mW, 1064nm laser
TE-cooled InGaAs array, 512 pixels, operating at -50oC
for low background noise.
RamanProbeTM fiber optic sampling probe with 5 m cable
length can be used to measure unknowns through transparent containers
(glass, pleastic). Options: probe extension cables (up to 200 m),
immersible probe capable of withstanding chemical decontamination.
Contact InPhototnics regarding surface enhanced Raman (SERS) substrates
for trace-level detection.
sizes of Class I sample holders available as options.
components are shock-mounted in a rugged, water-resistant case. Outer
dimensions 21" x 12" x 8" (533 x 305 x 203 mm), 29
lbs. (13 kg). Spectrometer can be operated at temperatures up to 30°C.
Hardware and Software
acquisition software and GRAMS/32®
manipulation software operating under Windows XP on an ultra-light
identification software, quantititative analysis software, and Forensic
Raman Spectral Library of 243 materials.
using external AC/DC adapter (included), or 12V-DC.
and prices are subject to change without notice.
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