Veridis: Electrical Engineer Internships



Veridis Mission & Vision:

Making the world a better place to live in by tackling climate change and environmental pollution. Veridis’s MADSCAN technology is able to, unlike the current technologies, analyse big plastic batches of any colour representatively and increase the commercial value of recycled plastics by 25%, while simultaneously providing critical information about the recycling quality and daily consistency. Taking plastic recycling to the next stage.

Basic Technology Rundown:

Our MADSCAN technology is based on the physical principles of the Differential Scanning Calorimetry (DSC) technique. The DSC technique works by heating up a sample chamber with a sample (in our use case the sample consists of plastic) at the same rate as an empty reference chamber. The difference in heat flux is measured, and the peaks that arise at specific temperatures are used to identify plastics and measure their degradation. This can be done because these peaks represent phase transitions in the sample. This technique can be used with all types and colors of plastics.

Various proposals outlined:

For the lock-in system and most of the digital systems integration, the work will be (at least a significant part) practical. The work on the power supply and the EMC compatibility will be more about a good theoretical design in the coming months.

• Power Supply

Our instrument has quite a high-power demand (in the order of 10kW), this gives us some challenges regarding the design of the power supply of all the elements. Especially as the demands of the subsystems vary widely. The sensor readout system uses low voltages in the range of 1.8V-15V with high precision requirements, while heating elements could use up to 3kW. This also means that the control system requires several changes to handle the higher power load.

• EMC compatibility of the full system

The instrument will be a sensitive measurement DSC-system and will be used in an industrial setting, this means the whole system will have to implement several techniques to limit EMI and EMS that might affect the measurements.

• Digital Lock-in Amplifier system

In our system, we need to read out our temperature sensors very accurately for an absolute temperature measurement. To realise this, we are currently using a sigma-delta adc coupled to a microcontroller unit (MCU). The next step is to integrate a lock-in amplifier system into this setup. We currently have a complete analog design for this. However, several components work better in the digital domain. In this internship, you will carry out these improvements and find other ways to improve on this part of the system.

• Digital systems integration

In this internship you’ll look into how to properly couple and integrate our control and measurement systems (additionally also perhaps the interface with our analysis system) and create a simple graphical user interface to handle and control the system. Part of this is also to assess and select a proper microcontroller unit (MCU) and write the SPI code for the readout system. Next to this, you can dive into the data processing and create a system for real-time readout plotting. If you have any other ideas, you are free to work these out if possible.

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