Standard ultrasonic power source

Abstract

The invention discloses a standard ultrasonic power source. The standard ultrasonic power source includes an input device, a DDS signal generation module, a control module, a power amplification module and an ultrasonic transducer; the input device is used for inputting frequency and power parameters; the DDS signal generation module used for generating a sinusoidal signal; the control module is used for obtaining the frequency and amplitude of the sinusoidal signal through calculating according to the input frequency and power parameters, and outputting the frequency and amplitude of the sinusoidal signal to the DDS signal generation module so that the corresponding sinusoidal signal can be generated; the power amplification module is used for performing power amplification on the sinusoidal signal; and the ultrasonic transducer is used for outputting sound waves according to the amplified sinusoidal signal, and includes a piezoelectric wafer used for realizing electroacoustic conversion, and an inductor connected in series between the piezoelectric wafer and the power amplification module and used for realizing impedance match. Thus, through the adoption of the DDS signal generation module, the control module can automatically control the output of frequencies and amplitudes according to the input frequency and power parameters; and compared with the adopting of function signal generators in the prior art, hand-operated adjusting according to the measuring voltage of high-frequency millivolt meters is not needed, and the automation and intelligence control of the standardultrasonic power source can be realized.

Description

technical field [0001] The invention relates to an ultrasonic device, in particular to a standard ultrasonic power source. Background technique [0002] The standard ultrasonic power source is a stable ultrasonic power source with known output ultrasonic sound power, which is mainly used as a transfer standard for ultrasonic sound power measurement to compare and calibrate various ultrasonic sound power measurement devices, such as ultrasonic power meters . [0003] Such as figure 1 As shown, the standard ultrasonic power source system on the market usually includes a function signal generator (such as Agilent 33250A), a power amplifier (such as AR25A100), a matching device and an ultrasonic transducer that are electrically connected in sequence, and the voltage value output by the matching device A high-frequency millivolt meter (such as URV55) for measurement has the following defects: [0004] First, using a function signal generator, it is necessary to manually adjust...

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Problems solved by technology

[0005] 2. The function signal generator, power amplifier, matcher and ultrasonic transducer are all independent instruments, which are connected to each other to form a standard ultrasonic power source system, which cannot be carried to the site for calibration

[0006] Third, the matching device is externally placed on the ultrasonic transducer, which is independent of each other, which is not conducive to the stability of the work, and occupies a large space, which is not conducive to the portability of the standard ultrasonic power source

[0007] Fourth, the structure of the piezoelectric wafer 01 of the ultrasonic transducer is as follows figure 2 As shown, an island-shaped electrode 011 is formed by silver-plating in the center of the wafer, and a ring-shaped electrode dividing line 013 is arranged around the island-shaped electrode, and a circle of silver-plated ring-shaped electrode 012 is arranged around the ring-shaped electrode dividing line. The side and the back are also plated with silver, and form a ground electrode together with the ring electrode; the piezoelectric wafer is generally made of quartz piezoelectric material, which has low conversion efficiency, and the electrodes of the piezoelectric wafer are generally silver-plated electrodes, which have poor anti-oxidation and corrosion resistance

[0008] Fifth, the working principle of the piezoelectric chip of the ultrasonic transducer is to receive electrical signal vibration and emit ultrasonic waves, so the structure of the ultrasonic transducer should allow the piezoelectric chip to vibrate but at the same time prevent it from loosening and falling. image 3 It is the structure of the ultrasonic transducer in the prior art. In order to allow the piezoelectric chip to vibrate sufficiently, the piezoelectric chip is arranged at the end of the open sleeve 03, and the end of the sleeve is provided with a radially outward groove 032, the piezoelectric chip 01 is set in the groove 032, and the silicone rubber filler (not shown in the figure) is injected into the groove 032 to fill in the gap between the groove and the piezoelectric chip to play the role of Fixed and waterproof, but in the case of large vibrations, the piezoelectric chip is still easy to detach from the silicone rubber out of the sleeve

[0009] Sixth, only a single frequency output can be achieved, and the output frequency is low, generally not higher than 16MHz

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