See examples of how we at Farsens are addressing tag casing requirements in applications demanding specific housing characteristics.
It’s been almost two years of posting in this blog and first post’s statement remains true – ‘There are 3 Keys to Successful RFID Battery Free Sensors’:
- Power Source
- Energy Harvesting, Power Management and Low Power Sensors
- Tag Casing
Power source – UHF RFID readers
You need to correctly select the reader in order to optimize the complete system performance. However, after testing multiple readers you may have a clear idea of which readers perform better in what environments/requirements.
Energy Harvesting, Power Management and Low Power Sensors
You need to address these when designing. Each sensor selected will set the basis for the rest of the areas but once that’s solved, the design remains the same for all applications requiring that specific sensor – this is not really true as you can always add data logging, external power sources like solar or piezo, but customization in this sense is limited.
Tag Casing or housing is something you will have to address for almost each application. While you can often get away with an existing casing for fixing an RFID tag for tracking and tracing purposes, using battery-free sensors generally requires that sensors are embedded in materials or fixed in hardly accessible places.
Plastic – ABS casing – and thermoplastic – low pressure molding – solutions are quite common and generic use. Sensors need to be taken out of the tag casing to monitor the requested magnitude –via a wire typically – or can also be kept inside when it makes sense – Kineo to monitor orientation of an asset.
However, many applications demand that tag casing is an integral part of the solution. We are sharing with you two examples under development that address this need.
Tire Pressure Monitoring Systems (TPMS)
As a request of monitoring tire pressure and temperature in heavy duty trucks, the sensor tag requires a casing to go inside the tire and withstand the activity of it. We are currently researching on a cushion gum tag casing – kind of what’s used as a flat tire patch – to embed the sensor in the tire.
Visual aid tags for picking processes
Using battery-free LED tags to help during picking processes is a highly demanded solution.
In this case a standard plastic or thermoplastic casing will block the flashes of the LED so they are not visible. You will need a transparent tag casing for this purpose that allows users to actually see the LEDs flashing.
These are just two examples of ongoing developments but the idea is to show you that casings offer a lot of variables in terms of protection, life, RF signal attenuation, fixture and other characteristics.
You need to address this variability and select/design the optimum tag casing for your specific application.