Ultrasonic particle size analyzer

The invention discloses an ultrasonic particle size analyzer, which comprises a hardware part and a software part, wherein the hardware part comprises an ultrasonic wave transmitting and receiving device and ultrasonic detection devices which are independent mutually, as well as an oscilloscope and a computer; the software part comprises a plurality of ultrasonic models, five global optimization algorithms and an expert consultation mode. An ultrasonic pulse signal is generated by the ultrasonic transmitting and receiving device, the ultrasonic waves are transmitted to suspension liquid through different ultrasonic detection devices, the amplitudes of the ultrasonic waves are attenuated after the ultrasonic waves are interacted with particles in the suspension liquid, and at different frequencies, the attenuation of the amplitudes is different according to the sizes and volume fractions of particles; particle size distribution and volume fractions of required particles can be obtained after the collected attenuation signal is processed through the computer. The ultrasonic particle size analyzer provided by the invention can perform nondestructive measurement, is rapid, reliable, and particularly suitable for high-concentration non-transparent samples, and samples are not required to be diluted.