Design and calibration of liquid crystal tunable filter based spectral imaging system

Weilin Wang, Changying Li, E. W. Tollner, Ron Gitaitis, Glen Rains

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

As evidence of hyperspectral and multispectral imaging for the quality inspections of food and agricultural products accumulates, the design and calibration of a spectral imaging device is gaining increasing interest. Liquid crystal tunable filter (LCTF) based spectral imaging, an important branch of modern spectral imaging, has many advantages in food quality and safety inspections. This paper presents the design, integration, and calibration of an LCTF based shortwave infrared spectral imaging system. The system consists of an LCTF, an InGaAs camera, a near-infrared lens, an illumination unit, and the data acquisition software. It was designed to capture hyperspectral or multispectral images in the spectral range of 900 - 1700 nm. The principles and key points of designing the LCTF-based spectral imaging system are summarized and discussed. A series of tests were conducted to calibrate the linearity of the system output, measure the field of view, enhance the system spectral sensitivity, measure the spatial and spectral resolution of the system, evaluate the stability of the system, the image distortion, and reduce the spectral noise of the system output. Results of calibration tests indicated that this system satisfied the design criteria for both spatial and spectral domains. The presented design and calibration methodologies are applicable to the electronic filter-based spectral imaging systems in other applications.

Original languageEnglish
Title of host publicationAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2012, ASABE 2012
PublisherAmerican Society of Agricultural and Biological Engineers
Pages3625-3642
Number of pages18
ISBN (Print)9781622762088
Publication statusPublished - 2012
EventAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2012 - Dallas, TX, United States
Duration: Jul 29 2012Aug 1 2012

Publication series

NameAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2012, ASABE 2012
Volume5

Other

OtherAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2012
CountryUnited States
CityDallas, TX
Period7/29/128/1/12

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Bioengineering

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    Wang, W., Li, C., Tollner, E. W., Gitaitis, R., & Rains, G. (2012). Design and calibration of liquid crystal tunable filter based spectral imaging system. In American Society of Agricultural and Biological Engineers Annual International Meeting 2012, ASABE 2012 (pp. 3625-3642). (American Society of Agricultural and Biological Engineers Annual International Meeting 2012, ASABE 2012; Vol. 5). American Society of Agricultural and Biological Engineers.