Double-exposure holographic interferometry with crystals of iron-doped lithium niobate as the storage material is applied to study heat transfer from electronic chips. These crystals are self-developing, making the reults immediately available for use. This method of interferometry can be used to study the temperature field in heating and cooling fluids. In particular, it is a practical method for studying the heat transfer from small devices such as microelectronic chips. Double-exposure holographic interferometry is a viable experimental technique in transient as well as steady-state problems.

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