INNER LAYER DEPTH DETECTION DURING CONTROLLED-DEPTH DRILLING USING CONTINUITY TEST COUPON
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United States of America Patent
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Issued Date -
Dec 10, 2015
app pub date -
Jun 6, 2014
filing date -
Jun 6, 2014
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Abstract
A method of detecting depth of a buried target disposed over an intermediate layer within a multi-layer substrate includes forming a test coupon on the intermediate layer during manufacture of the multi-layer substrate, the test coupon including a trace with probe sites at opposite ends; drilling a hole through the trace of the test coupon within the multi-layer substrate; monitoring electrical continuity of the test coupon during the drilling; and determining a depth of the buried target responsive to the monitoring. A hole may then be drilled based on the determined depth.
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