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FDP-7xx - Transflectance Dip Probe with Variable Path Length

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The transmission dip probe is a probe used to obtain on-line absorbance measurements in streams of fluids and containers. The probe end is simply dipped into the fluid to take the measurements. Via a standard
SMA905 connector light is coupled into a fiber bundle, consisting of 6 fibers and carried to the probe end, where it crosses a gap of 1, 2.5 or 5 mm and reflects against a diffuse white material. The back- reflected light comes back into a 7th fiber. This fiber transfers the data to the output SMA 905 connector that can be coupled to a spectrometer or a spectral analyzer.

At the probe end the read fiber is placed in the middle of the lighting fibers for best efficiency of the probe. Both bundles are led through one piece of flexible stainless steel tubing. In a ferrule they are split and run separated for one meter to reach the SMA 905 connectors.

PrincipleTransflectance using a diffuse white material
and a non-collimated optical beam
Path lengthSpacing: 1 mm, 2.5 mm or 5 mm / 0.04", 0.1" or 0.2"
Resulting path length: 2 mm, 5 mm, 10 mm / 0.08",0.2", 0.4"
Wavelength range200 - 800 nm (UV/VIS)
350 - 2000 nm (VIS/NIR)
Probe endStainless steel cylinder, water proof
100 mm / 3.9" length x 8 mm / 0.3" diameter
Probe material Stainless steel, fused silica window
Fiber optics7 x 200 Ám fibers, n.a. = 0.22
6 illumination fibers, 1 read fiber
SMA connected, 2 m length
Tubing: inner Teflon tube, outer plated brass for stress relieve, OD = 5 mm / 0.2"
Temperature range-40░C - 100░C /
(High-temperature versions available)
Minimum bend radius
(fiber optics)
Short term: 20 mm / 0.8"
Long term: 60 mm / 2.4"

Last change 03/03/2008
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