SU819701A1 - Device for measuring electro-acoustic transducer grid parameters - Google Patents

Description

(54) DEVICE FOR MEASURING. GRILL PARAMETERS - .. ELECTRIC ACCELERATOR CONVERTERS

frequency picker 7, amplitude correction block 8 and measure 9 amplitude and phase. The second measurement channel consists of a series-connected filter 10, whose input is connected to a receiving transducer 5, a frequency converter 11, an amplitude correction unit 12, and an amplitude and phase meter 13.

A measurement channel consists of a series-connected filter 14 whose input is connected to a n-nm receiving transducer, a frequency converter 15, an amplitude correction unit 16, and an amplitude and phase meter 17. The second inputs of the meters 9, 13, 17 amplitude and phase are interconnected and connected to the output of the generator of high-frequency oscillations

The outputs of the meters 9,13, 17 amplitude and phase are connected with the inputs of the processing unit 18. In addition, the drawing shows dummy converters 19, introduced by calculation. The device works as follows.

The generator 1 of high-frequency oscillations excites electro-acoustic emitting transducer 3.

Modulator 2 changes the frequency of the high frequency oscillator. In order to increase the spatial frequency of the hologram, receiving transducers 4.5, .. pipettes receive signals of different frequencies, which must be separately processed in such a way as to mimic receivers with dummy transducers 19 with corresponding phases and amplitudes. For this, signals from each receiving converter 4 are fed to filters b ... 14, which divide them into frequencies, and from the output of the filters, signals come to frequency converters 7 ... 15, which bring signals of all frequencies to one frequency Wo

where SL) about - the specified measurement frequency.

C. The outputs of the 7 ... 15 frequency converters signals are sent to the 8 ... 16 correction blocks, g1mp and the phases.

The transmission coefficients of blocks 8 ... 16 in each measurement channel are selected in accordance with the distance from the transmitting converter 38 to the real and dummy converters 4, 19 and 11: grids.

From the outputs of the amplitude correction blocks, the signals arrive at the first input of the 9 ... 17 meters of amplitude and phase, the second input of which receives the signal of a given frequency COO from the generator 1 output. In the processing block 18, a hologram is recorded with an increased spatial frequency.

Thus, the proposed device allows to increase the accuracy

measuring the parameters of the electroacoustic transducer arrays, and due to the frequency separation of signals reliably place more side lobes in the detectable sector of the angles of the radiation pattern.

Claims (2)

Invention Formula . A device for measuring the lattice parameters of electroacoustic transducers containing a generator connected in series 5 high-frequency oscillations and an electro-acoustic emitting transducer and n measurement channels, each of which consists of an amplitude and phase meter, the first The input of which is connected to the output of the high-frequency oscillator, and the second input is intended to be connected to the output of the receiving grating converter, characterized in that, in order to improve the measurement accuracy, it is equipped with a frequency modulator, the input of which is connected to the output of the high-frequency oscillator, and switched on in each channel measured. 0 SRI are connected in series by a filter whose input is intended to be connected to a receiving grating transducer, a frequency transducer and an amplitude correction unit, 5 the output of which is connected to the second input of the meter amplitude and phase. Sources of information taken into account in the examination Q1. Blinova, L.P., et al. Acoustic Measurements. M., Metallurgists, 1971, p. 35 2. Acoustic holography, translated from English, ed. Prokhorov V. G., L., Shipbuilding p. 246 (prototype).