PicoQuant GmbH HydraHarp 400 Software V. 3.0.0.1
8.2.2. TTTR Mode File Format
HydraHarp data files from T2 and T3 Mode (*.ptu) created by the HydraHarp software are tagged binary files
which contain both the setup parameters and the actual event data. There can be only one measurement per
file. The setup data in the file header which is similar to that in standard interactive mode files. In order to
identify a HydraHarp data file as a file created by and to be used by the native HydraHarp software, a program
reading in these files can read the tag assured content which begins with the string “HydraHarp“. However, a
piece of software aiming solely at retrieving the histogram data content can (and should be) be tolerant about
this tag and go for the pure event record data. This tolerance will ensure compatibility for the future. Indeed, the
demos in the subfolder \Filedemo in your chosen installation directory are following this tolerant approach.
For more information on individual file tags and their content, please consult the online help file available via
the help menu. It is worth noting that the actual TTTR record data following the file header has the same
structure as that of the previous file format version 2.0 (*.ht2,*.ht3) and corresponds directly to the raw
data obtained with custom programs using the HydraHarp programming library.
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