Stress detection method for sensor device with multiple axis sensor and sensor device employing this method
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United States of America Patent
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Jan 22, 2008
Grant Date -
Oct 20, 2005
app pub date -
Mar 8, 2005
filing date -
Apr 1, 2004
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Expired
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Abstract
The present invention provides the stress detection method for force sensor device with multiple axis sensor device and force sensor device employing this method, whose installation angle is arbitrary. The stress detection method includes, first and second force sensors whose detection axes are orthogonal to each other. When the detection axis of first force sensor forms angle .theta. with direction of detected stress Ax, and the stress component of direction perpendicular to direction of the detected stress Ax is Az, output Apx of the axis direction of first force sensor is found as Apx=.alpha..sub.x (Ax.times.cos .theta.+Az.times.sin .theta.), and output Apz of the axis direction of the second force sensor is found as Apz=.alpha..sub.z (Ax.times.sin .theta.+Az.times.cos .theta.), and, when .alpha..sub.x and .alpha..sub.z are detection sensitivity coefficients of first and second force sensors respectively, the detection sensitivity coefficient .alpha..sub.z of second force sensor is set as .alpha..sub.z=.alpha..sub.x tan .theta., and the detected stress Ax is found as Ax=(Apx-Apz)/.alpha..sub.x(cos .theta.-tan .theta..times.sin .theta.).
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