EMBEDDED THERMOCOUPLE VIAS
Original Publication Date: 1998-Jun-01
Included in the Prior Art Database: 2002-Jul-10
Accurate temperature measurement on functional printed circuit boards (PCB) is crucial to monitoring thermal processes and heat dissipation in the con- struction and use of electrical products. Typically, thermocouple wires are physically attached to the PCB to measure temperatures associated with processes such as reflow or heat dissipation from discrete components. While this technique is reasonably successful, one might get more accurate and reliable information by using thermocouples that reside within the PCB at locations of interest, For example, a T-type thermal couple could be constructed within a PCB by a two layer laminate having copper on one side and constantan (Cu-Ni alloy) on the other. As a result of standard via creation techniques, thermocouples could be embedded throughout a PCB but have thermal sensitivity exclusively at a via location (at a solder joint or under a component, etc.).