An ANT-based Low-power Battery-free Wireless Cryogenic Temperature Probes for Industrial Process Monitoring

This paper presents an ultra low-power batteryfree, wireless, multi-point temperature sensor for vacuum and cryogenic applications. This is applicable to low-temperature industrial processes such as lyophilisation (i. e. freeze-drying) where accurate temperature monitoring over long durations is necessary. The developed sensors are wirelessly powered using a 915 MHz RF source. The sensors utilize a low power 2.4 GHz ANT communication protocols and operate in a shared channel topology accommodating similar to 2(32) nodes. The battery-free nature and measurement capabilities have been successfully demonstrated in typical freeze-drying processes with close agreement to thermocouple data. The sensors occupies a small footprint of 10.3 by 28.75 mm(2) with a maximum power consumption of less than 1 mW.