Doppler speed measurement demonstration instrument

A Doppler speed measurement demonstration instrument belongs to the field of embedded computer measurement. An ultrasonic generator generates ultrasonic waves with frequency of 40 KHZ and given phase position; the ultrasonic waves are reflected by a spring oscillator, and an ultrasonic receiver receives signals; the signals are amplified and converted into square wave signals by an amplifying and shaping circuit; an ultrasonic generating circuit and a shaping circuit are respectively connected with a D trigger for realizing signal difference frequency; the D trigger is connected with an embedded computer to realize data analysis and treatment, and the rate of the spring oscillator is obtained through calculation; the embedded computer is connected with a D/A conversion module to output the rate changing curve of the spring oscillator through an oscilloscope, connected with a temperature sensor for temperature compensation, connected with a rate display module to output the instant rate of the spring oscillator and also connected with a sound demonstration module to output sound with frequency variation in a frequency-variable sound mode to represent speed change of the oscillator. The Doppler speed measurement demonstration instrument is strong in operability, visual in demonstration and low in development cost, and draws Doppler effect simulation, speed measurement and display, wave shape demonstration and sound demonstration into consideration.