Strain measurement system and multi-point measurement method strain

摘要

PROBLEM TO BE SOLVED: To provide a strain measuring method and a multipoint measuring system for preventing measurement values from being affected depending on resistance of lead wires connected with a set of two strain gages to be used in strain measuring.;SOLUTION: In this system, two series-connected strain gages with each gage factor of K₁, K₂ are attached to the area of an object where fraction a of its strain rate serves as known, electric current is applied to series circuits of these two strain gages through lead wires 2, 7. At initial state of strain metric and in strain measuring, voltage generated from each strain gage is extracted through lead wires 3-6 to obtain a value ε represented by the following formula as a strain measurement value, based on the above extracted voltage, with resistance value and its variation of the two strain gages made unknown:ε=(C_ε-C₀)/(K₁×C₀-a×K₂×C_ε)(where: C_ε= resistance ratio of both strain gages in strain measuring; and C₀= resistance ratio of both strain gages at initial state).;COPYRIGHT: (C)2005,JPO&NCIPI