SU506113A1 - Quasi-monochromatic delay line - Google Patents

Description

It is expedient to create a field frequency in the region L of the crystal by breaking the crystal into an antinode. A field of the microwave cavity.

The work of the delay line of a quasimochromatic signal is based on the phenomenon of parametric sound resonance in a piezo-semiconductor chip.

Frequency And the voltage source / equal to (us (see Fig. 2), there is a restructuring of the type ". Shelves 6. When the frequencies of these oscillations within a certain region of the shaft numbers are equal to -D, one oscillation increases (with:. The maximum increment wo - 7), and the other fades. The group velocity of oscillations with wave vectors inside the “shelf is zero.

Thus, if at the moment of passing through the crystal / between the electrodes 3 of a quasi-molochromatic sound pulse (Fig. 3a) with spatial filling () (), a sufficiently large alternating voltage of Q (o, The impulse image immediately appears — a reverse sound wave, the sound wave spectrum is rearranged, and the impulse

it stops, as under these conditions the elastic velocity of the elastic oscillations vanishes.

The resulting “high frequency oscillation (Fig. 36)

increasing due to parametric pumping. After turning off the voltage source 4, the acoustic spectrum takes the usual form: cos and, therefore, two quasi-monochromatic pulses (Fig. Ze), which can be detected by receiver 5 or radiator 2, are sent in different directions from the localization region L, if the latter is acoustoelectric transducer.

Claims (1)

Invention Formula A delay line of a quasi-monochromatic signal containing a piezo-semiconductor duct, an ultrasound emitter and receiver, electrodes and a voltage source, characterized in that, in order to ensure the quasi-monochromatic sound pulse to stop and amplify, the electrodes are located at a distance L (q) from one another and connected to a controlled source of alternating voltage.