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We have developed a VIS-IR probe for measurements in transparent to opake chemicals, as for example used in extruders. To comply with the hard conditions of an online-measurement as demanded by industry, the probes can withstand extremely high pressures, in extruders temperatures and diversion powers. Thus the probes guaranteed sustain pressures of up to 200 bar at a temperature of 650°C. At lower temperatures pressure sustainability increases to 600 bar at 20°C. We achieve this by a probe body of titanium alloy equipped with a sapphire window of 1 mm thickness. The measurements represent pressure sensors, so that the probes can be screwed into a standardized drilling. The optical elements in the probe body can easily be exchanged by simple screws. Thus, an adaptation to a new problem of measurement with different optical characteristics is easily possible.
The optical system has been arranged in rings. A 400 µm fiber is therefore used as a transmitter and center fiber, too. The reflected light is collected by seven fibers of 200 µm arranged in a ring around the center fiber. The diameter of the ring is designed to optimally reduce the internal diversion of light. Specially coated fibers combined with a special polishing permit the probes to withstand temperatures of more than 650°C. Transportation of light from its source to the transmission fiber is achieved by a 400 µm fiber optic cable. We recommend a single 600 µm fiber cable for light transportation to the analysis component. Connection is achieved with an SMA connector.
Should you have questions concerning the technical specification; our application scientists will be pleased to consult you.
| Specifications | Reflection Probe HT |
| Recommended spectral range | UV probe: 230 - 1060 nm
IR probe: 360 - 2500 nm |
| Max. permanent temperature range (probe tip) | +600 °C / 1100 psi |
| Max. pressure (probe tip) | 200 bar / 2900 psi |
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