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United States Department of Agriculture

Agricultural Research Service

Research Project: OPTICAL DETECTION OF FOOD SAFETY AND FOOD DEFENSE HAZARDS

Location: Quality and Safety Assessment Research Unit

Title: LED lighting for use in multispectral and hyperspectral imaging

Authors
item Lawrence, Kurt
item Park, Bosoon
item Windham, William
item Heitschmidt, Gerald

Submitted to: ASABE Annual International Meeting
Publication Type: Proceedings
Publication Acceptance Date: May 17, 2005
Publication Date: July 17, 2005
Citation: Lawrence, K.C., Park, B., Windham, W.R., Heitschmidt, G.W. 2005. LED lighting for use in multispectral and hyperspectral imaging. ASABE Annual International Meeting. Paper No. 053073.

Technical Abstract: Lighting for machine vision and hyperspectral imaging is an important component for collecting high quality imagery. However, it is often given minimal consideration in the overall design of an imaging system. Tungsten-halogens lamps are the most common source of illumination for broad spectrum applications such as multispectral and hyperspectral imaging. They are usually chosen because they have high output throughout the visible and into the near infrared region (400 to 900 nm). Yet these incandescent lamps suffer from a shorter bulb life and they generate significant amounts of heat. Recently, high power, broad-spectrum "white" LEDs have been developed that can potentially replace tungsten-halogen incandescent lamps for some applications where bulb life and thermal constraints are factors. These high-power LEDs are long lasting (over 10,000 hours) and generate significantly less heat than incandescent lamps. They can also be positioned in a multitude of configurations for targets with challenging geometries. This paper reports the use of high-power, white LEDs for illumination in multispectral and hyperspectral imaging systems. Thermal design was necessary to stabilize the output intensity. Results indicate that, for measurements between 420 and 650 and between 820 and 900nm, high-power LEDs are a suitable light source for some multispectral and hyperspectral imaging systems.

Last Modified: 4/21/2014
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