Laser light backscattering for continuous measurement of moisture content and colour of apple during drying
- Publication Type
- Contribution to conference
- Authors
- Romano G; Argyropoulos D; Khan M T; Nagle M; Müller J
- Year of publication
- 2010
- Published in
- Proceedings of the IDS 2010
- Page (from - to)
- 1789-1793
- Conference name
- 17th International Drying Symposium
- Conference location
- Magdeburg (Germany)
- Conference date
- 3-6 October 2010
The objective of the study was to test the possibility of non-invasive laser backscattering for monitoring product quality parameters during drying of untreated apple slices. Samples were subjected to convective hot air drying at air temperatures of 60 and 70° C with air velocity of 0.9 m/s and 10 g/kg absolute humidity. Backscattering images of ten slices were acquired every 30 minutes over three hours of drying. The measurement setup included a 670 nm and 785 nm laser diode and a digital CCD camera used for capturing images. Backscattering area and light luminescence expressed by gray values were able to predict change in moisture content and yellowness during drying.