 Diffuse
Reflection Probe
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StellarNet Inc. offers a low-cost diffuse
reflection probe that is rugged enough for use in industrial process environments, yet
small and light weight enough for use in a laboratory setting. The diffuse reflection
probe is also ideal for use as a fluorescence probe. The optical fiber is 400-micron core
fused silica and is clad in stainless steel armor. If needed, the armor can be sealed with
Teflon® to provide a barrier to the
environment. For process insertion, the probe includes an O-ring seal 1/2 - 20 SAE
straight thread connector; alternatively, an extension tube may be added to the rear of
the probe and can be adapted to the customer's process connection requirements. The probe
is available in both UV and NIR versions, as dictated by the customer's application
needs.
TECHNOLOGICAL INNOVATIONS
The diffuse reflection probe makes use of a
tapered six-around-one fiber configuration behind a sapphire window. The taper directs
light from each of the six surrounding fibers towards a sampling region just outside the
sapphire window that overlaps the collection cone of the central fiber. The sapphire
window is brazed into a high purity alumina housing with a gold-nickel alloy. The alumina
housing is sealed to the stainless steel body of the probe using either a Teflon ® or graphite compression ferrule. For more demanding
applications, the brazed sapphire window may be over coated with diamond-like carbon
film.* This film improves corrosion resistance and reduces fouling.
*Visible and NIR use only.
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| OPTICAL |
|
| Sensing
Region |
Max.
sensitivity @ 1mm |
| Lens/Window
Material |
Sapphire### |
| Numerical
Aperture |
0.22 NA |
| Efficiency |
>5% at
500nm** |
| Fiber
OpticTermination |
SMA
905 |
| Fiber
Optic Type |
400/440
Silica on Silica*^ |
| Fiber
Optic Cable Type |
Armored
7 fiber bundle ## |
| Fiber
Optic Length |
3 meters
to 200 meters
|
| PHYSICAL |
|
| Body
Materials |
316
SS and AI2O3*** |
| Body
Length # |
2.75" |
| Diameter-Tip/Body |
0.25"/0.5" |
| Seal Type |
Sapphire
to Al2O3 braze |
| Seal
Material |
Au-Ni
braze |
| Temperature
Range |
-200º to
500º C |
| Maximum
Pressure |
500
psi
|
| * Specify UV or NIR grade Fused Silica - UV grade 200nm to 900nm -
NIR grade 350nm to 2200nm. |
** Efficiency measured relative to direct fiber connection between
light source and detector using 400 micron core fiber optic. |
| *** Other materials available upon request - allow 8 weeks for
delivery of special materials. |
## Standard laser wavelengths are 532nm and 785nm.
Other wavelenths available, allow 8 weeks for delivery. |
| ## Optional probe length extension tubes available - specify length
up to 1 meter available. |
^ Other fiber sizes available upon request. |
| |
### Optional Teflon® seal available
for armor. |
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Kalrez and Viton are registered
trademarks of DuPont Dow Elastomers
Teflon isa registered trademark of DuPont |
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