ONO SOKKI Application - Measuring Young's modulus of timber

Dynamic Young's modulus of timber for building materials can be measured by basic frequency of sound. The LA-1410 sound level meter detects the timber sound hammered by wooden hammer etc. The power spectrum of the detected sound is measured by using trigger function and averaging function of the CF-4700 FFT comparator. And the peak frequency of the power spectrum "fo" refers to set as the number of basic vibration of timber "fo". The Young's modulus is calculated by the following math formula from the dimension and weight of the timber. The measurement is performed in the environment without ambient noise.