A liquid crystal tunable filter based shortwave infrared spectral imaging system

Design and integration

Weilin Wang, Changying Li, Ernest W. Tollner, Glen Christopher Rains, Ronald D. Gitaitis

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

This paper presents the methodology to design and integrate a liquid crystal tunable filter (LCTF) based shortwave infrared (SWIR) spectral imaging system. The system consisted of an LCTF-based SWIR spectral imager, an illumination unit, a frame grabber, and a computer with the data acquisition software. The spectral imager included an InGaAs camera (320 × 256 pixels), an SWIR lens (50. mm, F/1.4), and an LCTF (20. mm aperture). Four multifaceted reflector halogen lamps (35. W, 12 VDC) were used to build the illumination unit. The system was integrated by a LabVIEW program for data acquisition. It can capture hyperspectral or multispectral images of the test object in the spectral range of 900-1700. nm. The system was validated by differentiating sugar from wheat flour, and water from 95% ethanol. The results showed that the system can distinguish these materials in both spectral and spatial domains. This SWIR spectral imaging system could be a potential useful tool for nondestructive inspection of food quality and safety.

Original languageEnglish
Pages (from-to)126-134
Number of pages9
JournalComputers and Electronics in Agriculture
Volume80
DOIs
Publication statusPublished - Jan 1 2012

Fingerprint

Imaging systems
Liquid crystals
Systems analysis
image analysis
crystal
filter
Infrared radiation
data acquisition
liquid
lighting
Image sensors
halogens
Data acquisition
multispectral image
food safety
Lighting
food quality
halogen
Lens
wheat flour

All Science Journal Classification (ASJC) codes

  • Forestry
  • Agronomy and Crop Science
  • Computer Science Applications
  • Horticulture

Cite this

A liquid crystal tunable filter based shortwave infrared spectral imaging system : Design and integration. / Wang, Weilin; Li, Changying; Tollner, Ernest W.; Rains, Glen Christopher; Gitaitis, Ronald D.

In: Computers and Electronics in Agriculture, Vol. 80, 01.01.2012, p. 126-134.

Research output: Contribution to journalArticle

Wang, Weilin ; Li, Changying ; Tollner, Ernest W. ; Rains, Glen Christopher ; Gitaitis, Ronald D. / A liquid crystal tunable filter based shortwave infrared spectral imaging system : Design and integration. In: Computers and Electronics in Agriculture. 2012 ; Vol. 80. pp. 126-134.
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