Multispectral radiometer and camera for visible and near-IR applications

Thorsten Graeve; Davis Alan Lange; Laurence M. Flath; Michael R. Descour; Eustace L. Dereniak

doi:10.1117/12.50541

1 January 1992 Multispectral radiometer and camera for visible and near-IR applications

Thorsten Graeve, Davis Alan Lange, Laurence M. Flath, Michael R. Descour, Eustace L. Dereniak

Proceedings Volume 1539, Ultrahigh- and High-Speed Photography, Videography, and Photonics '91; (1992) https://doi.org/10.1117/12.50541
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

This paper discusses the design of a multispectral radiometer and camera implemented using a CCD imager, two Silicon photodiode radiometers and a rotating filter wheel equipped with six bandpass filters spaced throughout the visible and near-IR spectrum. One of the radiometers has a field-of-view matched to that of the camera to measure integrated scene radiance, whereas the other radiometer functions as a spot radiometer to measure small surface radiances. The system is synchronized with the 60 Hz camera video and transfers the 16-bit digitized data from the two radiometers once every video field through a parallel interface to a video data encoder. The encoder incorporates the data into the current video field for VCR recording and later playback and analysis. The system is designed for airborne use mounted underneath the wing of an aircraft. Its main purpose is to analyze the spectral radiances of various surfaces involved in high-speed videography experiments. The data obtained with the radiometer will be used to refine specifications for a high-speed, high-resolution solid state imager. However, applications extend to any field where fast, spectral measurements are required. A data set obtained for a sample application is presented to illustrate the performance of the system.

Citation Download Citation

Thorsten Graeve, Davis Alan Lange, Laurence M. Flath, Michael R. Descour, and Eustace L. Dereniak "Multispectral radiometer and camera for visible and near-IR applications", Proc. SPIE 1539, Ultrahigh- and High-Speed Photography, Videography, and Photonics '91, (1 January 1992); https://doi.org/10.1117/12.50541

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KEYWORDS

Radiometry

Cameras

Video

Imaging systems

Optical filters

Calibration

Photodiodes

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