Shows METAS headquaters
Shows METAS headquaters

METAS Test Campaign – 1/3

During the test campaign in spring 2019 at the Swiss Federal Institute of Metrology (METAS), the real-time aerosol monitoring systems Swisens Poleno was tested under laboratory conditions for different evluations. In this part we present the results of the evaluation of the minimum detectable particle size.
For evaluating the minimum detectable particle size, measurements of particle sizes of 0.5µm and larger were carried out on 8 and 10 April 2019 at the Swiss Federal Institute of Metrology (METAS) on behalf of MeteoSwiss. There the trigger signals responsible for the detection of individual particles were recorded thus defining lower detection limit. The following figures 1,2 and 3 show the superimposed trigger signals of several particles of the specified size.
trigger signal of detectable particle size of 2µm
trigger signal of detectable particle size 1µm
 
trigger signal of detectable particle size 0.5µm
 
The figures show that particles down to a size of 1µm can be reliably detected, while the signal peaks at 0.5µm are still visible but their exact trigger times are increasingly imprecise and therefore Swisens Poleno proofs a lower detection limit of 1µm. Recent introduced hardware updates allowing reliable triggering of particles down to 0.5µm in size. In order to prove reliable particle triggering, measurements will be done in spring 2020 at METAS.
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