This foam was also used to attach acrylic sides to the heat sink, forcing all of the air moved by the fan over the cooling fins. Rather than drilling and tapping further mounting holes, double sided adhesive foam was used to attach the two and give some mechanical isolation between the fan and the rest of the assembly. Nylon hardware is used rather than steel to minimise heat transfer between the hot and cold sides of the Peltier device. Once centre punched and drilled, these holes were tapped with an M6 thread to accept nylon bolts to secure our Peltier device and cooling plate to the heat sink. The photo above shows a simple jig to aid the marking out of holes to be drilled in the heat sink. It can also be cut to make sizing and positioning jigs. MDF sheet stock is cheaper than acrylic and useful for testing revisions of a design before committing to more expensive stock material. A set of digital callipers were used to measure the stock parts chosen for our project, providing dimensions for mounting holes and cut-outs. Rapid prototyping with a laser cutter allows for the design and construction of enclosures from sheet material at relatively low cost. Whilst useful for housing and protecting the electronic components and wiring, the enclosure will also provide a sturdy base upon which to mount our heat sink and cloud chamber. Switches, inputs and outputs to the system will be housed in a custom enclosure, with bright LEDs positioned to illuminate the alcohol vapour trails within the cloud chamber. These will all be connected to a Raspberry Pi, with the readings displayed on a 16x2 LCD display (819-5119)
Temperature sensors will be used to monitor the temperature of the system in three locations: the cooling plate, the heat sink and the ambient temperature. On the opposite side to remove heat from the system. To reduce the temperature of the cooling plate in our cloud chamber, with a large fan-cooled heat sink (189-8252) They make use of the thermoelectric effect, further reading on which can be found on Wikipedia. They can also be used to create a voltage when there is a heat difference present across the two sides. Peltier modules are thermoelectric devices that get cool on one side and hot on the other when a voltage is applied, and can be employed for either cooling or heating depending upon the application. Other custom parts will be laser cut from MDF and acrylic. This first post will cover the initial design and build, using DesignSpark Mechanical to draw a cooling plate in 3D, before exporting the model and milling it from aluminium.
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In this series of posts we will build our own cloud chamber with a combination of off-the-shelf and custom made parts, using a Peltier module (693-5075)įor cooling and a Raspberry Pi (832-6274) Cloud chambers are a basic form of particle detector that can be used to detect ionising radiation – invented by Charles Wilson, a Scottish physicist – in the early twentieth century.
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