XPost: sci.physics, alt.solar.thermal   
   From: vaughnsimon@gmail.invalid   
      
   "Morris Dovey"  wrote in message   
   news:j8uhnp$ogl$1@speranza.aioe.org...   
   > AFAICT, the "real time" aspect would pretty much require turning off the   
   > heater power briefly at intervals long enough (1 msec?) to capture the heater   
   > resistance to determine the temperature.   
      
   Morris, (On the huge assumption that I understand what you are trying to do).   
   Any time you heat a mass with a point temerature source, you end up with a   
   temperature gradient.  The heater temperature will be significantly hotter than   
   the material you are heating.  The short interval approach you mention will   
   give   
   you the temperature of the heater, not the temperature of the mass you are   
   heating.  Is that what you really want?  To accurately measure the temperature   
   of the mass using the heater as a sensor, you will need to have a longish time   
   delay so that your sensor can cool down and finally match the temperature of   
   the   
   mass.   
      
   Vaughn   
      
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