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Thermocouple Using a Rubber Spacer as a Spring Loading Mechanism to Measure Package Surface Temperature

IP.com Disclosure Number: IPCOM000016813D
Publication Date: 2003-Jul-16
Document File: 3 page(s) / 176K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method that uses a rubber spacer as spring loading mechanism to measure package surface temperature. Benefits include a more consistent surface temperature measurement.

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Thermocouple Using a Rubber Spacer as a Spring Loading Mechanism to Measure Package Surface Temperature

Disclosed is a method that uses a rubber spacer as spring loading mechanism to measure package surface temperature. Benefits include a more consistent surface temperature measurement.

Background

In current thermal resistance metrology (TRES) at ATD, a thermocouple is attached underneath a cooling solution with thermal insulated epoxy (i.e. Omega Bond). To make sure the thermocouple contacts the package surface, the thermocouple bead protrudes 1 to 3 mils out from underneath the cooling solution. During the surface measurement, the thermocouple bead cannot contact the surface consistently due to the presence of thermal interface material between the cooling solution and the package surface (see Figure 1). Also, the protrusion of the thermocouple bead can vary from operator to operator during the thermocouple attach process. These inconsistencies produce variations in the measured surface temperature and increase metrology errors.

General Description

Figure 2 shows the disclosed method using a rubber spacer as the spring loading while measuring the package surface temperature. The thermocouple bead is positively protruded by the rubber spacer with a certain loading force, which then allows it to pass through the thermal interface material and contact with the package surface. A meter converts voltage signals that pass through a paired wire from the thermocouple bead to a tem...