The development of the CTD probe project focuses on creating a robust, affordable, and open-source solution for measuring conductivity, temperature, and depth in aquatic environments. A first functional prototype has already been successfully developed and validated, demonstrating the feasibility of the system and its core sensing capabilities.

The current objective of the project is to transition from an experimental prototype to a reliable platform suitable for large-scale replication and long-term field deployments. This involves redesigning and improving the electronics, mechanical structure, waterproofing, and software architecture to ensure robustness, maintainability, and ease of reproduction. Particular attention is given to developing an open-source approach, allowing the scientific and educational communities to freely replicate, modify, and extend the system according to their own needs.

Future developments also include improving sensor calibration procedures, optimizing power consumption, and facilitating integration with autonomous platforms such as profiling floats and other environmental monitoring systems. 

Project description -> SOON <-

An uncredited project in partnership with the SenseLab in Sion.

The development of the Argo-Float project aims to provide a compact, autonomous, and adaptable platform for environmental monitoring in lakes and other aquatic environments. Inspired by Argo profiling floats used in oceanography, the system performs repeated vertical “yo-yo” movements to collect data throughout the water column while remaining low-cost, modular, and energy efficient.

The project focuses on the integration and testing of multiple sensing and communication systems, with the objective of improving the float’s autonomy, reliability, and scientific capabilities. Current areas of development include adaptive sampling strategies based on lake conditions, wireless transmission of collected data to nearby ships, and interfacing with additional environmental sensors such as CTDs. Another important objective is the development of an under-ice deployment configuration using a submerged anchoring system instead of a surface buoy, enabling measurements in lakes, fjords, and polar environments. Future work also includes hardware and electronics redesigns to transition from prototyping solutions toward a more robust and professional platform.

Project description -> SOON <-

This project corresponds to approximately 10 credits and is in partnership with the SENSE Lab and EAWAG.

Recommended sections: Robotics, NX, EL, MT, GM… 

The open SeaO2 is a device for measuring the flow of CO2 between the atmosphere and the ocean. It has been designed in the low-tech philosophy, i.e. to be open-source, sustainable, useful and low-cost.

The aim of this semester’s project is to redesign the work of Alexandre Tellier, who designed the device at Sailowtech and Yanis Mouzaoui, who did his semester project on it last semester. One should restore the original prototype, improve its reliability and compute some laboratory test.

The Open Sea02 tool contains one equilibrium chamber with two pumps, one that pumps water inside the chamber, the other pumps the water out of chamber. There is also an air pump that transfers air to a NDIR sensor that measures C02 levels where we can deduce it partial pressure. A ToF sensor is used to maintain the water level in the chamber constant, and two microcontrollers are used to operate the pumps

Project description -> HERE <-

This project corresponds to approximately 8 credits and is in partnership with the Sense Lab in Sion. The lab pays the transport fees.

Recommended sections: SIE, SV…

The Planktoscope is an open-source microscope for observing and identifying plankton kept in water samples. Sailowtech collected plankton samples from Lake Geneva and several other Swiss lakes, at different depths in the water column.

The Planktoscope will be used to image the organisms. The software associated with the Planktoscope allows the images to be segmented to isolate each plankton, and the EcoTaxa platform then takes care of their taxonomic identification. If all the metadata from the sampling is recorded correctly, it becomes possible to estimate the density of a given species in the sampled area.

The ultimate goal is to analyze statistics on the vertical distribution of plankton, i.e., to understand how different species are distributed according to depth.

This project involves the analysis of plankton from Swiss lakes.

                                Project description -> HERE <-

Recommended sections: Bachelor project of SV,SIE…

Example of plankton images obtained :

 The Planktoscope that will be used:

The CTD probe is a tool developed by Sailowtech, a MAKE association at EPFL that collects and analyzes lake data using low-tech methods. The CTD is a submerged instrument that measures pH, temperature, dissolved oxygen, and depth. Collecting this type of data is extremely important, particularly for establishing links between physical phenomena (temperature, water acidity) and their impact on marine biodiversity, such as plankton.

Project description -> HERE <-

This project corresponds to approximately 6 credits.

Recommended sections: SV

Raman spectroscopy – which analyses the light scattered by a laser beam on a sample – is a technique that can be used to identify plastics, as each plastic has a unique optical fingerprint. Furthermore, when coupled to a microscope, plastics down to < 1 μm in diameter can be studied. However, most commercial Ramanmicroscopes are bulky, expensive pieces of equipment not fit for use on a boat. The aim of this project is to perfect a low cost, small Raman microscope that can be used on a Sailowtech cruise and that identifies microplastics in samples. Several examples of low cost Raman systems exist in literature, though these have not been adapted for use on boats.

A first prototype of the Raman technology was achieved last semester. A database (OpenRamanDatabase) was developed.

However, challenges remain.

Project description -> HERE <-

This project corresponds to approximately 10 credits and is in partnership with the LNET laboratory.

Recommended sections: PH, MT, Robotics, GM, MX… 

The development of the gas monitoring station strives for a successful balance between affordability, functionality, and sustainability in the context of marine environmental monitoring. Designed to operate under the constraints of sailboat expeditions, the station aims to offer a compact, low-cost, and repairable solution for tracking key atmospheric pollutants—ozone (O3), carbon monoxide (CO), and particulate matter (PM)—along with solar irradiance. It also features humidity, temperature and pressure sensors to help fine tune and calibrate the gas sensors. The objective of the project is now the following: Complete the design, integration, and testing of a multi-sensor gas monitoring station. In particular, the project aims to address key areas of improvement identified during initial development phases, including mechanical sealing, electrical redesigns, software enhancements, and user access optimization.

Project description -> HERE <-

This project corresponds to approximately 10 credits.

Recommended sections: SIE, Energy, PH, MT, EL, Robotics, GM…

— Coming soon —

An uncredited project in partnership with the SenseLab in Sion.

Le Planktoscope est un microscope modulaire open-source imaginé par Fairscope. Après avoir constuit notre V1, nous souhaitons passer à une V2 de notre outil pour en améliorer sa qualité et son accessibilité.

Cet outil permet d’obtenir des images quantitatives de planctons. Une base de données open-source EcoTaxa permet de répertorier et identifier les espèces observées. Ce projet consiste à fabriquer la V2 de notre planktoscope mais aussi à le tester sur le Léman et à s’approprier la base de données. Le projet peut être adapté pour être crédités de 4 à 10 crédits. Ce projet est en collaboration avec le laboratoire d’imagerie bio-médicale de l’EPFL.

                               Project description -> HERE <-

Recommended sections: SV,SIE…

Images obtenues de planctons du Léman avec un Planktoscope :