The high-resolution aerosol spectrometer welas-system measures particle size and quantity in high concentrations, practically without border-zone-error. The device is equipped with a very small sensor. The patented T-aperture-technique allow aerosol measurements in particle size ranges from 180 nm to 40 µm. The optical measurement volume and the signal processing make it also possible to detect coincidences.
The practical measuring device now makes it easy to measure at places that have been difficult to access so far, such as rooms with explosion hazard. Even particle measurements in atmospheres of -90 °C are possible with this device.
The sensor is supplied with white light. Measured data are sent through an optical fibre cable to the evaluation unit. The evaluation unit may be far away from the sensor. Distances of up to 300 m are pos-sible.