Your problem is similarly solved in the article

Journal of Applied Spectroscopy, Vol. 73, No. 2, 2006

NONRADIATIVE ENERGY TRANSFER IN CARBOCYANINE

DYE COMPOSITIONS INSIDE SURFACTANT MICELLES

S. L. Efimova,* A. V. Sorokin, A. N. Lebedenko,

Yu. V. Malyukin, and E. N. Obukhova

Dear Sir Yuri,

Thank you for your answer.

I want to know if there is any method by which we can remotely track the flow of fluid containing fluorescent nanoparticles inside a sand packed bed?

Kind Regards,

Shilpa

The primary fluorescent strength might not be strong enough to be detected, try using a secondary wavelength shifter to record the changes.