Event-locked Fourier spectroscopy (ELFS) allows one to use ordinary
Fourier transform spectrometers that have continuously scanning
interferometers to perform time-resolved or gated measurements.  The
method works as an add-on and leaves the spectrometer optics and
electronics unmodified.  It was developed by <a
href="http://www.physics.ucf.edu/~hew">Henry Weidner </a> as a major part
of his PhD thesis at the University of Central Florida.  A patent is
pending.  The technology has been licensed to <a
href="http://www.concentric.net/~Zaubertk"> Zaubertek, Inc. </a> and is
available commercially from this company. The <a
href="ELFS_hist.html">history </a> of its development can be seen in a
final report to the Air Force Office of Scientific Research, who funded
the development.