Comparison of Four Nondestructive Sensors for Firmness Assessment of Apples
نویسندگان
چکیده
Nondestructive firmness measurement is critical to assuring postharvest quality and marketability of apples. In this research, two in-house developed sensors (bioyield and spectral scattering) and two commercial sensors (acoustic and visible and shortwave nearinfrared (Vis-SWNIR) spectroscopy), were evaluated for assessing the firmness of apples. Spectral scattering measurements were taken from the fruit moving online, while firmness measurements using the other three sensors were made in a stationary condition. The destructive Magness-Taylor (MT) penetrometric test was also conducted to provide reference firmness measurements, against which the four sensors were evaluated. A total of 6,535 ‘Delicious', 'Golden Delicious', and 'Jonagold' apples harvested in 2009 and 2010 were tested. For spectral scattering and Vis-SWNIR techniques, firmness prediction models were developed using partial least squares methods and then validated with independent samples. The correlation of spectral scattering with MT firmness for the three apple varieties for the two harvest years varied between 0.849-0.940, and similar results were obtained with VisSWNIR (R=0.849-0.924). Acoustic and bioyield measurements had considerably lower correlations with MT firmness, with R=0.589-0.871 and 0.608-0.852, respectively. This research demonstrated that spectral scattering and Vis-SWNIR were generally superior to acoustic and bioyield techniques in assessing MT firmness, but they require calibration models, which adds complexity in practical uses.
منابع مشابه
Nondestructive Determination of ‘golden Delicious’ Apple Quality and Harvest Maturity
The usefulness of nondestructive methods for measuring chlorophyll content in skin of ‘Golden Delicious’ apples and for evaluating quality parameters and fruit maturity using optical reflectance spectrometry was studied. The fruit weight, firmness, total soluble solids content and titratable acidity during vegetation period and short-term storage at 10°C of ‘Golden Delicious’ apples were measur...
متن کاملNondestructive Firmness Estimation of Tomato Fruit Using Near-Infrared Spectroscopy
Today, nondestructive methods are widely used to determine the quality of agricultural products. Meanwhile, visible and near-infrared (Vis/NIR) spectroscopy is regarded as one of the most widely used methods in the field of quality assessment of agricultural products. In this study, a system was developed to measure the Vis/NIR spectra of tomato fruit samples in the half-transmittance mode of m...
متن کاملAcoustic detection of apple mealiness based on support vector machine
Mealiness degrades the quality of apples and plays an important role in fruit market. Therefore, the use of reliable and rapid sensing techniques for nondestructive measurement and sorting of fruits is necessary. In this study, the potential of acoustic signals of rolling apples on an inclined plate as a new technique for nondestructive detection of Red Delicious apple mealiness was investigate...
متن کاملRelation of Biospeckle Activity with Quality Attributes of Apples
Biospeckle is nondestructive optical technique based on the analysis of variations of laser light scattered from biological samples. Biospeckle activity reflects the state of the investigated object. In this study the relation of biospeckle activity (BA) with firmness, soluble solids content (SSC), titratable acidity (TA) and starch content (SC) during the shelf life of seven apple cultivars wa...
متن کامل