PH—Postharvest Technology: Advances in Spectral Analysis of Vibrations for Non-destructive Determination of Tomato Firmness
✍ Scribed by Bart De Ketelaere; Josse De Baerdemaeker
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 237 KB
- Volume
- 78
- Category
- Article
- ISSN
- 0021-8634
No coin nor oath required. For personal study only.
✦ Synopsis
Characteristics of fruit vibrations are related to the material properties of the fruit. A new method for spectral analysis is developed and used for the non-destructive estimation of tomato "rmness. The resonant frequency of the "rst elliptical mode of the tomato is related to its "rmness. However, the determination of the resonant frequency is not straightforward for highly damped fruits. Non-parametric smoothing is applied to the frequency spectra to obtain a robust estimate for the resonant frequency. The smoothing method is based on a statistical approach. The most important parameter that has to be determined is the smoothing parameter, as it determines whether the "tted function will be (too) smooth or (too) wavy. Risk estimation is used to "nd the optimal value. Using the proposed algorithm, fewer repeated measurements are needed for the assessment of the "rmness of a single tomato.