Instrumentation, Measurement, and Metrology

New versatile setup for goniometric measurements of spectral radiance

[+] Author Affiliations
Lu Zhao

University of Bergen, Department of Physics and Technology, Allégt. 55, N-5007 Bergen, Norway

Kristian P. Nielsen

University of Bergen, Department of Physics and Technology, Allégt. 55, N-5007 Bergen, Norway

Jon K. Lotsberg

University of Bergen, Department of Physics and Technology, Allégt. 55, N-5007 Bergen, Norway

Endre Marken

University of Bergen, Department of Physics and Technology, Allégt. 55, N-5007 Bergen, Norway

Jakob J. Stamnes

University of Bergen, Department of Physics and Technology, Allégt. 55, N-5007 Bergen, Norway and PhotoSense AS, Allégt. 55, N-5007 Bergen, Norway

Knut Stamnes

PhotoSense AS, Allégt. 55, N-5007 Bergen, Norway and Stevens Institute of Technology, Light and Life Laboratory, Hoboken, New Jersey 07030

Opt. Eng. 45(5), 053606 (May 24, 2006). doi:10.1117/1.2205287
History: Received February 21, 2005; Revised September 06, 2005; Accepted October 07, 2005; Published May 24, 2006
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We discuss a new versatile setup for goniometric measurements of spectral radiances with two modes of operation: (1) it can operate as a 2-D goniometer for measurements in a horizontal plane of the singly scattered radiance from particles in suspension and (2) it can be used as a 3-D goniometer for measuring spectral radiances over an entire hemisphere. In our setup, various kinds of light sources and detectors can easily be inserted. Among the detectors, a spectral imager is designed and used. Proper hardware and software is chosen so as to make our setup fully automated and easy to operate. We present results from two different investigations to demonstrate the utilization of our setup. The first investigation is concerned with measurements of the volume scattering function (VSF) over a large forward and backward angular range. Our experimental results for the VSF show good agreement with theoretical simulations. We also use our setup to obtain a series of 1-D angular spectral images of the skin on the dorsal side of a human hand in vivo by employing various illumination angles. Our setup provides a robust, highly automated, and flexible framework for carrying out goniometric measurements in a variety of applications.

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© 2006 Society of Photo-Optical Instrumentation Engineers

Citation

Lu Zhao ; Kristian P. Nielsen ; Jon K. Lotsberg ; Endre Marken ; Jakob J. Stamnes, et al.
"New versatile setup for goniometric measurements of spectral radiance", Opt. Eng. 45(5), 053606 (May 24, 2006). ; http://dx.doi.org/10.1117/1.2205287


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