Online Lignin Sensor for High Speed Sorting of Newsprint from Recovered Paper
| dc.contributor.advisor | Dr.M.K.Ramasubramanian, Committee Chair | en_US |
| dc.contributor.author | Mallapragada, Vishnu Goutham | en_US |
| dc.date.accessioned | 2010-04-02T18:15:41Z | |
| dc.date.available | 2010-04-02T18:15:41Z | |
| dc.date.issued | 2005-08-30 | en_US |
| dc.degree.discipline | Mechanical Engineering | en_US |
| dc.degree.level | thesis | en_US |
| dc.degree.name | MS | en_US |
| dc.description.abstract | A compact fluorescence based sensor for real time measurement of lignin content in paper has been developed to automate the sorting of newsprint from mixed waste. Lignin content predicted using this sensor correlates well with actual lignin content. However, as a binary sensor to identify low and high lignin content, the sensor works extremely well. Effects of various parameters such as excitation wavelength, filter bandwidth and color were studied. These results were used to optimize the performance of the sensor. A commercial trial on a moving conveyor was carried out and the results were satisfactory. Sensor response depends on the distance between the paper sample and the sensor head. In real-time, distance between paper samples and sensor head varies depending on the thickness of paper on the conveyor. Hence, a cascaded solenoid system has been developed to move the sensor head. Calibration curves in combination with sensor head movement make the sensor very effective over a wide range of distances. Motorola HC12 micro controller interface is provided to the sensor for analog to digital conversion, computation and serial communication to a PC. Sensor output can be monitored at a remote location away from the sorting conveyor. The sensor is capable of identifying news print samples moving at a speed of 1200 feet per minute. | en_US |
| dc.identifier.other | etd-08292004-141154 | en_US |
| dc.identifier.uri | http://www.lib.ncsu.edu/resolver/1840.16/2592 | |
| dc.rights | I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. | en_US |
| dc.subject | lignin | en_US |
| dc.subject | fluorescence | en_US |
| dc.subject | automated sorting | en_US |
| dc.subject | sensor design | en_US |
| dc.title | Online Lignin Sensor for High Speed Sorting of Newsprint from Recovered Paper | en_US |
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