Particle Deposition Measurement at the Einstein Telescope Project
Our PDM3 Deployed in a Case Study at the ETP in Maastricht!
In 2023, our intern Youri Hissink, then a student at Fontys, completed an internship centered on particle deposition monitoring—a critical aspect of maintaining cleanroom standards. Representing SAC, Youri used the PDM to measure particle accumulation in the Einstein…
PDM Witness Plates Receive an Upgrade
The PDM Witness Plates have been upgraded with a new feature: internal laser engraving.
The first generation of Witness Plates used a black marking that allowed the PDM to recognize the plate. However, this marking had a drawback: with use, the material degraded, making it difficult for the PDM to…
Partikelfalle – Witness plate
Is a Witness plate the same as a Partikelfalle?
Yes it is. In the englisch language we talk about the plate showing the evidence of the deposition. In the german language it is called the trap for particles. Often is the “trap” even equiped with a door like the exposure boxes. The dimensional set-up does ensure…
What about particle size
The particle size in deposition requires the definition of the manufacturer of the measuring equipment. Unlike working with polysirene equivalent dust to calibrate an airborne counter, the deposition counting and sizing is done under a automatic optical microscope scanning the disk. The optical system is calibrated by means of optomechanical standards. Around each…
facility cleaning and PDM
Cleaning of a cleanroom is expensive and requires extra people to work in the cleanroom. Therefore smart cleaning can reduce costs as well as the level of cleanliness reached in a cleanroom. The change of surface contamination can be measured by PDM equipment in automatic mode or in regular intervals. Upon…
Particle size distribution
The particle size distribution is normally a straight line in a log-log graph. The PDM equipment produces such a graph as visual result of a measurmeent. In this graph three area’s of interest can be found. The aera around small particles such as 5 tot 15 micrometer. If this group of particles dominates…
Transparent measuring method
Getting a feeling of what is measured and how it is measured is a good property of measurement equipment. The particle deposition measurement equipent provides a transparent chain of data that can be verified by remeasuments or using particles of known size. Even NIST particles are available for testing the size accuracy. Counting…
