For a certain object, there is a natural resonance frequency. When the volume and material of the object are fixed, the resonant frequency of the object is only related to its density. The strength of an object is related to its density, so its natural vibration frequency determines its strength. If the resonance frequency of the object can be measured, the strength of the object can be calculated according to the strength theory. This instrument is to measure the resonance frequency of objects and calculate the elastic modulus of objects. It can be used to measure refractories and so on. It is widely used in production enterprises, scientific research institutions, colleges and universities, quality inspection departments, etc. Reference standards: ASTM c885 test method for Young's modulus of refractory products - acoustic resonance method, ASTM c8851548 test method for Young's modulus, shear modulus and Poisson's ratio of refractories impulse excitation method. The instrument is controlled by computer to realize the whole process automation of test, calculation and report.

Computer controlled data acquisition and control card outputs sine wave signal with frequency from small to large to transmit to the transmitting probe. The vibration of the transmitting probe is transmitted to the sample to force the sample to vibrate mechanically. When the transmitting frequency is the same as the natural frequency of the sample, resonance will occur. At this time, the vibration amplitude of the sample will produce extreme value, which will be transmitted to the data acquisition control card through the receiving sensor probe Back to the computer, the computer can find the resonance frequency according to the frequency scanning, and then calculate the elastic modulus according to the sample weight and overall dimensions input into the computer.