A solar illuminated glinting specular object can serve as an in situ sensor probe that is observable from long distances.
Retroreflective objects produce bright glints when illuminated by coaxial illumination sources such as lasers. These
glints are modulated in various ways by illumination source variances, the local probe environment, the intervening
propagation paths and the remote sensing system. The modulating signals can be recovered by using reflectivity
detectors with temporal, spatial, wavelength, directivity and polarization sensitivity. Clustered and moving specular
probes provide additional information through geometry extraction, beam forming and multisensor noise reduction.
Experimental results are shown for omnidirectional specular imaging, atmospheric wake turbulence measurement,
redeye sensing and acoustic sensing.