Precise correction in laser doppler forced vibrology of soft products

The modulus of elasticity of spheroids can be estimated by the analysis of their proper free vibrations, and can be used for the evaluation of fruit maturity and/or ripening. The lowest frequency resonant peak (mode M0) was previously proposed as a basis for corrections of the whole amplitude–frequency plot in relation to the forcing deformation level. This paper describes a computing method that makes it possible to incorporate M0 peak self-changes into the correction. The exact solution is given for parabolic and/or parabolic-like peaks. It is shown that improving the correction process is important mainly for wide peaks. The methods of making precise corrections of amplitude–frequency plots in case of general, not parabolic, M0 peaks are also given.