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Small scale temperature recorder for use with active radio frequency identification to monitor temperature of e.g. flowers has sensing cell comprising conductive electrodes connected to electric property measuring devicee
H F Gleeson, I Dierking, P D Brimicombe, S Kaur, B D Grieve, N C Woodyatt, J M Wasikiewicz, S G Yeates, M L Turner
Syngenta Ltd,WO2012007347-A1. 2012 Jan 19..
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Abstract
The recorder has a reactant mixture comprising an initiator initiating cross-linking of a reactive monomer to form sensing material (20) that provides a record of temperature of a sensing cell (10) when cross-linking occurs. The sensing material comprises a cross-linked network dispersed within liquid crystalline material, where the network is formed from the monomer. The sensing cell comprises electrically conductive electrodes (14) connected to an electric property measuring device i.e. capacitance measuring device, arranged to measure electric property of the sensing material.