A gage for measuring heat flux to a surface or through a laminated material employs five thin-films, chromel/ alumel (type K) thermocouples deposited on the upper and lower surfaces of a wafer with a thermal conductivity of 1.4 W/m. K and a thickness of 0.25 mm.

(a) Determine the heat flux q" through the gage when the voltage output at the copper leads is 350 p., V. The See beck coefficient of the type- K thermo-couple materials is approximately 40µV/^oC.

(b) What precaution should you take in using a gage of this nature to measure heat flow through the laminated structure shown?

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Alumel (B) Chromel (A) Copper leads Thermal barrier, k Surface-mounted Gage bonded between laminates gage