PIEZOELECTRIC RESONANCE CONTACT PICK-UP

摘要

A piezoelectric resonance contact pick-up comprises a casing (1) having the form of a body of revolution and containing inside a piezoelectric wave exciter (2) which matches the form of the casing (1) and is in acoustic contact with the latter. The casing (1) carries at least two rods (3) provided with contact caps (4), their axes being oriented at right angles to the surface of the casing (1). The piezoelectric wave exciter (2) and the casing (1) form together a common oscillatory system is which the frequency of oscillations of the casing (1) together with the rods (3) and contact caps (4) is equal to the oscillation frequency of a sinusoidal electric signal applied to the excitation electrode (14) of the piezoelectric wave exciter (2). The present invention may be preferable used in coordinate measuring machines intended for measuring linear and angular dimensions of parts with a complex form.