Patent ID: 6752029
Filing Date: 2004-06-22
Classification: G01G,G01L

Abstract:
A device for measuring change in load applied to a structure comprising:means for mounting said device to said structure; a first magnetically permeable core; a second magnetically permeable core; means, internal to said device, for supporting said first magnetically permeable core and said second magnetically permeable core in a manner and an orientation to both provide a gap therebetween and farm a magnetic circuit, said gap lying in a plane transverse to direction of said load, size of said gap being a function of magnitude of said load; an electrically conductive wire wound around at least said first core; a capacitance; a capacitance inductance circuit formed from said capacitance being operatively coupled to said electrically conductive wire, said capacitance inductance circuit having a resonant frequency; and, means for measuring change in said resonant frequency as a function of change in said gap size and for calibrating said resonant frequency change with change in said magnitude of said load; whereby said change in said load applied to said structure is measured.