112 Apr-09
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5.4 Fiber optic Transmission Dip probes
For in-line absorption measurement as fiber optic transmission dip probe is used. The transmission
dip probes come with either fixed path length or variable path length. The standard configuration is
a 6 illumination around 1 read fiber, which is 2 meters long. All probes can be delivered with UV/VIS
or VIS/NIR fibers.
Technical data
7 fibers 200 µm core, 6 light-fibers, 1 read fiber, n.a.= 0.22.
200-800 nm (UV/VIS) or 350-2000 (VIS/NIR)
Standard SMA905 connectors (2x)
0.25 - 10 mm spacing, i.e. an optical path of 0.5-20 mm
Stainless steel or PEEK cylinder , 140-160 mm long x 12,7 mm (1/2")
diameter. Waterproof
The optical fibers are protected by a PVC inner tube and a flexible chrome
plated brass outer tubing. The tubing also gives stress relief. OD: 5.0 mm
Optionally a waterproof, steel reinforced, silicon tubing can be provided
-30 ºC to 100 ºC. (High Temperature Probes available on request)
Minimum bend radius: Short term (few seconds) 20 mm, long term: 60 mm
Please follow the next rules:
1. Gently remove the plastic protection caps from the fiber SMA connectors.
2. Inspect the fibers if light is transmitted, note that for small fiber diameters the transmitted light
energy may be low, so it is hard to see.
3. Do not bend the fiber too tightly, the minimum recommended bending radius of a fiber is 600
times the core/cladding diameter (i.e. 12 cm for a 200µm fiber), further bending may induce
losses in optical transmittance. Bending the fiber below a radius of 200 times the fiber diameter
may cause irreversible damage.
4. Keep connectors and tips protected by the plastic caps when not in use.
5. When necessary the fiber end can be cleaned with soft tissue and alcohol or acetone, avoid
scratching.
6. With the probe a 1,5mm wrench allyn key is delivered, so the setscrew of the variable path can
be loosened, before changing the path length. Afterwards the setscrew needs to be tightened.
7. Since the optical reflector at the end of the probe is a diffuse reflecting material, a calibration
of absorption values versus concentration needs to be done for all the chosen path lengths.
8. Do not exceed temperature specifications.
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