Use of a radial angular filter array to estimate the position of an optically attenuating object within a turbid medium

Yan Zhang; Fartash Vasefi; Mohamadreza Najiminaini; Bozena Kaminska; Jeffrey J. L. Carson

doi:10.1117/12.909709

13 February 2012 Use of a radial angular filter array to estimate the position of an optically attenuating object within a turbid medium

Yan Zhang, Fartash Vasefi, Mohamadreza Najiminaini, Bozena Kaminska, Jeffrey J. L. Carson

Author Affiliations +

Proceedings Volume 8230, Biomedical Applications of Light Scattering VI; 82300A (2012) https://doi.org/10.1117/12.909709
Event: SPIE BiOS, 2012, San Francisco, California, United States

Abstract

The Radial Angular Filter Array (RAFA) is a novel optical filter consisting of a radially-distributed series of micromachined channels, which converge upon a focal point several millimeters away from the edge of the device. It is designed to measure the angular distribution of light emitted from an object located at the focal point and is capable of selecting ballistic and quasi-ballistic photons at specific angles out of strong background noise due to scattering. We hypothesized that the device might be useful for examining optically absorbing features below the surface of a turbid medium via a depth mapping approach. In order to validate this concept, experiments were performed with a focused laser beam, a series of Intralipid^TM solutions (0.1 wt% to 1.0 wt%), a 0.5 mm diameter graphite rod (absorber), and a RAFA optically coupled to a line camera. By scanning the position of the rod and comparing the light scattering profiles obtained by the RAFA at each scanning step, the location and the depth of the rod were successfully identified. Future work will be directed toward studying the performance of the technique with a collimated broadband illumination beam for spectroscopic applications.

Citation Download Citation

Yan Zhang, Yan Zhang, Fartash Vasefi, Fartash Vasefi, Mohamadreza Najiminaini, Mohamadreza Najiminaini, Bozena Kaminska, Bozena Kaminska, Jeffrey J. L. Carson, Jeffrey J. L. Carson, "Use of a radial angular filter array to estimate the position of an optically attenuating object within a turbid medium", Proc. SPIE 8230, Biomedical Applications of Light Scattering VI, 82300A (13 February 2012); doi: 10.1117/12.909709; https://doi.org/10.1117/12.909709

ACCESS THE FULL ARTICLE

PERSONAL SIGN IN
Full access may be available with your subscription

Email or Username Forgot your username?

Password Forgot your password?

Show

Remember Email/Username on this computer

Remember Password

No SPIE account? Create an account
or Institutional Sign In via Shibboleth

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $14.40

Non-members: $18.00 ADD TO CART

Show All Keywords

Keywords/Phrases

Search In:

Publication Years