Arrangement for generating natural resonant oscillations of a mechanical oscillating system
First Claim
1. Arrangement for generating natural resonant oscillations of a mechanical oscillating system comprising an electro-mechanical oscillation exciter, which on excitation by an electrical excitation signal generates a drive force which sets the oscillating system in mechanical oscillations, the phase position of which coincides with the phase position of the excitation signal, a displacement sensor converting the mechanical oscillations into an electrical sensor signal having a phase position which coincides with the phase position of the deflection of the mechanical oscillating system, and an excitation circuit which receives the sensor signal and emits the excitation signal, said displacement sensor comprising a light transmitter, a light receiver and a light waveguide means, and wherein the light waveguide means comprises first and second sapphire rods of which the first sapphire rod is connected at one end to the light transmitter and the second sapphire rod is connected at one end to the light receiver, the other ends of the two sapphire rods terminating in angled faces which act as totally reflecting prisms, the angled faces lying spaced apart opposite each other in such a manner that light flux passing from the light transmitter through the first sapphire rod enters the second sapphire rod and is conducted by the second sapphire rod to the light receiver, said displacement sensor further comprising at least one immersion tab which is attached to the mechanical oscillating system in such a manner that in dependence upon the deflection of the oscillating system said tab projects to a greater or lesser extent into a gap formed between the prism-like ends of the sapphire rods.
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Accused Products
Abstract
An arrangement for generating natural resonant oscillations of a mechanical oscillating system includes an electromechanical oscillation exciter which on excitation by an electrical excitation signal generates a drive force setting the oscillating system in mechanical oscillations, an oscillation sensor which is formed as displacement sensor and senses the mechanical oscillations of the oscillating system and converts them to an electrical sensor signal, and an excitation circuit which receives the sensor signal and supplies to the oscillation exciter the electrical excitation signal with the frequency of the sensor signal. The excitation circuit includes a phase control circuit which controls the phase position of the excitation signal in dependence upon the phase position of the sensor signal. A phase shift circuit produces a phase displacement of 90° between the sensor signal and the excitation signal so that the phase condition for the excitation of the mechanical oscillations at the natural resonant frequency of the mechanical oscillating system is fulfilled. This makes it possible to maintain the natural resonant frequency of the mechanical oscillating system with very great accuracy and high stability with time even with oscillating systems of high quality.
149 Citations
6 Claims
- 1. Arrangement for generating natural resonant oscillations of a mechanical oscillating system comprising an electro-mechanical oscillation exciter, which on excitation by an electrical excitation signal generates a drive force which sets the oscillating system in mechanical oscillations, the phase position of which coincides with the phase position of the excitation signal, a displacement sensor converting the mechanical oscillations into an electrical sensor signal having a phase position which coincides with the phase position of the deflection of the mechanical oscillating system, and an excitation circuit which receives the sensor signal and emits the excitation signal, said displacement sensor comprising a light transmitter, a light receiver and a light waveguide means, and wherein the light waveguide means comprises first and second sapphire rods of which the first sapphire rod is connected at one end to the light transmitter and the second sapphire rod is connected at one end to the light receiver, the other ends of the two sapphire rods terminating in angled faces which act as totally reflecting prisms, the angled faces lying spaced apart opposite each other in such a manner that light flux passing from the light transmitter through the first sapphire rod enters the second sapphire rod and is conducted by the second sapphire rod to the light receiver, said displacement sensor further comprising at least one immersion tab which is attached to the mechanical oscillating system in such a manner that in dependence upon the deflection of the oscillating system said tab projects to a greater or lesser extent into a gap formed between the prism-like ends of the sapphire rods.
Specification