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Feed‐back Temperature Control System for Microwave Ovens Using a Shielded Thermocouple
Author(s) -
RAMASWAMY H.,
VOORT F.R.,
RAGHAVAN G.S.V.,
LIGHTFOOT D.,
TIMBERS G.
Publication year - 1991
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1991.tb05321.x
Subject(s) - thermocouple , setpoint , shielded cable , microwave , temperature control , materials science , temperature measurement , microwave oven , heat sink , cavity magnetron , heating system , electrical engineering , composite material , mechanical engineering , thermodynamics , engineering , computer science , telecommunications , thin film , physics , artificial intelligence , nanotechnology , sputtering
A dynamic system was developed and evaluated to continuously monitor product temperature in ovens using an aluminum shielded thermocouple. The signal was processed by a computer controlled feedback relay to turn the magnetron on or off relative to a preselected setpoint. Results indicated the temperature of water (> 100 mL) could readily be maintained within 1°C of the setpoint. Temperatures for small samples (∼5 mL) could also be controlled, however, they required use of an additional microwave heat‐sink in the oven cavity to prevent temperature overshooting. The thermocouple based feed‐back temperature control system worked well and provided a simple way to control sample temperature in a microwave oven.