Force transducer having a linear transfer characteristic

Details Force transducer having a linear transfer characteristic Force transducer having a linear transfer characteristic

1975-06-16

1978-05-30

Ruehl, Charles A.

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

73654, G01P 1508

Patent

active

040916804

ABSTRACT:
The force transducer includes a composite spring structure having first and second folded cantilever leaf spring portions coupled to the region to receive the force to be measured. The first and second leaf spring portions extend outwardly from, and are angularly displaced with respect to each other, around an axis of sensitivity. Each folded cantilever leaf spring portion includes first and second generally parallel elongated leg portions extending outwardly from the axis of sensitivity with each of said leg portions being coupled together at the outer end by a coupling structure which is free to move both parallel to and perpendicular to the axis of sensitivity in response to displacement of the inner end of one of said leg portions relative to the other along the axis of sensitivity in response to application of the force to be measured to the inner ends of the leg portions. The leg portions are dimensioned to have a higher compliance along the axis of sensitivity than the compliance thereof perpendicular to the axis of sensitivity. Differential capacitance or piezoresistance strain gauges are the preferred method for deriving an output which is proportional to the component of applied force tending to displace one of the leg portions relative to the other along the axis of sensitivity. Squeeze film damping is the preferred method of damping the composite spring structure.

REFERENCES:
patent: 2067803 (1937-01-01), Thearle
patent: 2332994 (1943-10-01), Draper et al.
patent: 2696592 (1954-12-01), Petroff
patent: 2702186 (1955-02-01), Head et al.
patent: 2767973 (1956-10-01), Terveen et al.
patent: 3321964 (1967-05-01), Kooman
patent: 3713333 (1973-01-01), MacGeorge
patent: 3837222 (1974-09-01), Raskin

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