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Ocean Optics - Inventor of the World's First Miniature Spectrometer
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General Purpose Transmission Dip Probes
Our T300-RT and T200-RT Transmission
Dip Probes couple to our spectrometers and light sources to measure
absorbance and transmission in solutions. These probes are
especially useful for embedding into process streams for in situ,
real-time sample monitoring.
Theory of Operation
In transmission dip probes, light is transmitted from
the illumination fiber through a plano-convex lens and through the sample
compartment to a flat, second-surface mirror. The light reflects from this
mirror and is focused by the lens onto the read fiber. The advantage of
the transmission probe is its compact optical design, which fits into a
6.35-mm (1.4") OD stainless steel body, or ferrule. The trade-offs with
these probes are that they measure both transmitted light and
backscattered light from the sample and have internal reflections that
limit the dynamic range of the measurement. Still, at less than $1,000,
transmission probes are a cost-effective option for many on-line and lab
applications.
T300-RT Design
The T300-RT-UV-VIS Transmission Dip Probe consists of
two 300-µm solarization-resistant optical fibers -- one illumination fiber
and one read fiber -- in a 3.175-mm (1.8") OD stainless steel assembly
that slides into a 127-mm long, 6.35-mm (1.4") OD stainless steel ferrule.
Each leg of the probe assembly has an SMA 905 termination so that one leg
can be attached to a light source and the other to a spectrometer.
TP300 Probe
The TP300-UV-VIS Probe is a chemically inert PEEK transmission probe
that can be equipped with a tip (RT-PH) for mounting transmissive films in
the optical path. Light is directed via one fiber through the mounted film
to a mirror. Then light is redirected back through the film to a receive
fiber that returns the light to the spectrometer. The sample is free to
flow over the sides of the film. By using an RTP-2-10 (adjustable 2-10 mm)
Transmission Tip, the TP300-UV-VIS can be used for routine transmission
measurements.
T200-RT Design
The T200-RT-VIS-NIR Transmission Dip Probe has the same
optical design as the T300-RT-UV-VIS, but is made with two 200-µm VIS-NIR
optical fibers in its assembly.
Process Applications
Both probes fit into a standard 1.4" Swagelok fitting
for installation into a pipe or reactor. Probe optics are mounted with an
epoxy that offers superior chemical resistance to most solvents and can
tolerate high temperatures.
Screw-on Tips: Choose Your Pathlength
Available separately are the screw-on, interchangeable
probe tips necessary to use either probe. The RT-series tips come in
pathlengths of 2 mm, 5 mm or 10 mm so that sampling setups can be
configured for optically dense or dilute solutions.
Pricing
| Item Code |
Description |
Price |
| T300-RT-UV-VIS
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Transmission Dip
Probe with 300 µm diameter UV/SR optical fiber (200-1100 nm) in 6.35
mm diameter ferrule |
Call for Price |
| T300-RT-VIS-NIR
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Transmission Dip
Probe with 300 µm diameter VIS-NIR optical fiber (400-2500 nm) in
6.35 mm diameter ferrule |
Call for Price |
| T200-RT-VIS-NIR
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Transmission Dip
Probe with 200 µm diameter VIS-NIR optical fiber (400-2500 nm) in
6.35 mm diameter ferrule |
Call for Price |
| RT-2MM |
2 mm pathlength tip
for T200-RT and T300-RT Transmission Probes |
Call for Price |
| RT-5MM |
5 mm pathlength tip
for T200-RT and T300-RT Transmission Probes |
Call for Price |
| RT-10MM |
10 mm pathlength
tip for T200-RT and T300-RT Transmission Probes |
Call for Price |
Specifications
| Item |
Specifications |
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Fiber type |
T300: 300 µm solarization-resistant or VIS-NIR
optical fiber; T200: 200 µm VIS-NIR optical fiber |
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Outer diameter: |
6.35
mm |
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Probe length: |
127
mm |
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Fiber length: |
2
meters |
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Breakout: |
1.5
meters from the end of the probe |
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Optics: |
Fused
silica |
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Probe wetted materials: |
Stainless steel, fused silica, Epotek 353ND |
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Pathlength: |
2,
5 or 10 mm |
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Internal materials: |
Aluminum |
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Pressure: |
100
psi |
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Fiber jacketing: |
PVC
Monocoil |
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Probe sleeve: |
Stainless steel |
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Connector: |
SMA
905 |
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Operating temperature: |
Up to
100º C without sleeve |
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Contact an Ocean Optics Applications Scientist
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