Making h(t) for LIGO
  The conversion of the read-out from the anti-symmetric port of the LIGO interferometers into gravitational strain has thus far been performed in the frequency domain. Here we describe a conversion in the time domain which is based on the method developed by GEO. We illustrate the method using the Hanford 4km interferometer during the second LIGO science run (S2). 
Xavier Siemens, Bruce Allen, Jolien Creighton, Martin Hewitson and   Michael Landry