Abstract: The speed, acceleration and profile of a moving target object, such as a vehicle, are determined by processing signals provided by an array of detector elements in response to detecting a pair of laser beams reflected from the target object. The speed, acceleration and profile determinations are processed to classify the vehicle as belonging to one of a plurality of different predetermined speed, acceleration and profile categories, respectively.

Abstract: A tunable spectrometer includes an acousto-optical tunable filter disposed for filtering light from a discrete light source, wherein the light emerges from the filter in a simultaneous plurality of distinct beams having different orders of diffraction, with different diffraction orders having different wavelength ranges and with complementary pairs of said distinct beams having the same diffraction order respectively having substantially the same wavelength ranges.

Abstract: Light from a discrete broadband visible and/or infrared light source is collimated and transmitted within an optical path that is open to an ambient environment through a spatial region of interest and is focused to a beam splitter, which splits the transmitted light into different beams and directs the different beams respectively to a pair of narrowband acousto-optical tunable filters (AOTF). One such AOTF is disposed for filtering one split transmitted light beam and is rapidly tuned through a predetermined series of different wavelengths that are characteristic of an energy absorption spectrum for a first given substance, or of a first predetermined set of given substances. The other AOTF is disposed for filtering the other split transmitted light beam and is rapidly tuned through a given substances.