SU497472A1 - Ultrasonic device for motion control - Google Patents

Description

one

Known ultrasonic devices containing an oscillator, emitter, waveguide, receiver and phase meter.

The proposed ultrasound device differs from those known in that it is equipped with a receiver with an amplifier and phase-sensitive device. a unit that automatically introduces a correction into the generator of the radiator when the phase of the standing wave changes. This improves the accuracy of reference.

The principle of operation of the proposed device is shown in FIG. 1 and 2.

The described ultrasound device can be made in two versions.

In the first embodiment, the device for controlling movements comprises a generator with a radiator and two acoustic receivers of ultrasonic vibrations with amplifiers and a phase meter, which controls the system for automatically adjusting the frequency of the generator. This option makes it possible to compensate for systematic errors.

The emitter 1 (Fig. 1), driven by the generator 2, is mounted on a machine or a measuring machine that emits ultrasonic vibrations into the air in the direction of the acoustic receivers 3 and 4. Receiver 3 moves together with the moving element of the machine or machine. As it moves, the phase difference between the electrical oscillations of the high-frequency generator 2, which excites the radiator 1, and the oscillations at the output of the receiver 3 and the amplifier 5, changes. The phase difference is measured by a phase meter 6. The distances 1x corresponding to zero phase difference or an integer number of wavelengths are recorded 7. To compensate for systematic errors, the device contains an acoustic receiver 4 installed at a fixed distance of 4. When the propagation conditions of the ultrasonic waves change, the difference phase between oscillations of generator 2 and oscillations at the output of receiver 4 and amplifier 8, which is measured by a phase-sensitive unit 9. The latter, through control element 10, automatically adjusts the frequency of generator 2.

In the second embodiment, the proposed device is a transparent body (for example, optical glass) with excited ultrasonic waves in it and contains an electron-optical system for visualizing and counting interference bands.

light on ultrasound. The device also contains an acoustic receiver with an amplifier and a phase-sensitive unit that automatically corrects when the phase of the standing wave changes.

In a transparent waveguide 11 (Fig. 2), mouth

When standing on a machine or from a test mother, the standing ultrasonic waves are excited by the radiator 12 and the generator 13. When the ultrasonic waves are illuminated by a parallel beam of light formed by the illuminator 14, the slit 15 and the lens 16, the standing waves appear in the focal plane of the lens 17 in the form of light and dark interference fringes. When the waveguide 11 is moved, the photovoltaic device 18 performs the registration of the bands. To compensate for systematic faults, the device contains an acoustic receiver 19 with an amplifier 20. When the phase difference between the oscillator 13 of the generator 13 and the oscillations at the output of the amplifier 20, which is measured by the phase sensitive unit 21, changes, the generator 13 automatically adjusts the frequency of the oscillator.

Subject invention

An ultrasonic device for controlling movements with a generator and a radiator, characterized in that, in order to increase the accuracy of the reference, it is equipped with a receiver with an amplifier and a phase-sensing input unit that automatically introduces a correction into the generator of the radiator when the phase of the standing wave changes.