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Example: overlap program

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The following example program shows one way of combining the functions detector_site() and overlap() to calculate the overlap reduction function $\gamma(f)$ for a given pair of detectors. In particular, we calculate $\gamma(f)$ for the Hanford, WA and Livingston, LA LIGO detector sites. The resulting overlap reduction function data is stored as two columns of double precision numbers ($f_i$ and ) in the file LIGO_overlap.dat. Here $f_i=i\Delta f$ with $i=0,1,\cdots,N-1$. The values of $N$ and $\Delta f$ are input parameters to the program, which the user can change if he/she desires. (See the #define statements listed at the beginning of the program.) Also, by changing the site location identification numbers and the output file name, the user can calculate and save the overlap reduction function for any pair of detectors--e.g., the Hanford, WA LIGO detector and the GEO-600 detector; the GEO-600 and VIRGO detector; the Garching and Glasgow detectors; etc. The overlap reduction function data that is stored in the file can then be displayed with xmgr, for example. (See Fig. [*].)

Includes/overlap.tex

Figure: The overlap reduction function $\gamma(f)$ for the Hanford, WA and Livingston, LA LIGO detector pair.
\begin{figure}\begin{center}
\epsfig{file=Figures/f1_sb.ps,angle=-90,width=5in}\end{center}\end{figure}


next up previous contents
Next: Function: get_IFO12() Up: GRASP Routines: Stochastic background Previous: Function: overlap()   Contents
Bruce Allen 2000-11-19