A feedback I/sup 2/-controlled constant temperature solar radiation meter

Implementation of a Feedback I2-Controlled Constant Temperature Environment Temperature Meter

“…Using the same methodology described for feedback I 2 -controlled constant solar radiation meter [1], and applying to environment temperature meter, measure variable could be expressed as:…”

“…Linear relationship between pulse width variations, the measure variable, and environment temperature, the variable to be estimated, was obtained [1][2][3].…”

“…x(t) is the measure variable, which is proportional to square sensor current (I s 2 ), and y(t) is the observed variable, proportional to sensor resistance (R s ), which must be kept constant by controller action. If sensor resistance remains constant, sensor temperature (T s ) remains also constant and, any change over x(t) is a linear function of H or T a variations [1][2]. An implementation of this system as an environment temperature meter was realized, (Fig.…”