AMIRA CHN file format

The channel files are used to define the delay times and widths or start and end times of the time gates used to acquire the data. AMIRA CHN data file format is specified by ASEG Technical Standards Committee http://www.interpex.com/universalSoundingFormat.PDF.

This format is commonly used to export binary data from TerraTEM, ProTEM, Zonge GDP32, etc.

Window times may be specified in the .tem file.


Sample 1 .chn File

User defined instrument
NUMTIMES:47
DELAY      WIDTH
0.021      0.002
0.028      0.002
0.037      0.002
0.046      0.002
0.056      0.002
0.065      0.002
0.075      0.002
0.084      0.002
0.093      0.003
0.105      0.01
0.118      0.01
0.132      0.01
0.145      0.01
0.158      0.01
0.172      0.01
0.185      0.01
0.199      0.01
0.216      0.02
0.237      0.02
0.259      0.02
0.28       0.02
0.302      0.02
0.323      0.02
0.344      0.02
0.366      0.02
0.395      0.02
0.433      0.02
0.47       0.04
0.507      0.04
0.545      0.04
0.582      0.04
0.62       0.04
0.657      0.04
0.71       0.04
0.78       0.04
0.849      0.04
0.919      0.1
0.988      0.1
1.057      0.1
1.127      0.1
1.196      0.1
1.298      0.1
1.431      0.1
1.564      0.1
1.698      0.1
1.831      0.1
1.965      0.1



Sample 2 .chn File

User defined instrument 
NUMTIMES:5 OFFTIME:31.25
TIMESSTART TIMESEND
0.0765     0.1035
0.1035     0.1305
0.1305     0.171
0.171      0.225
0.225      0.2925


AMIRA .chn keywords recognized by TDEM Geomodel

Parameter Keywords
Number of delay times or channels NUMTIMES
Delay time (ms) DELAY, DELAY(ms), TIMES, TIMES(ms)
Channel window width (ms) WIDTH, WIDTH(ms), TIMESWIDTH, TIMESWIDTH(ms)
Start of each window (ms) TIMESSTART, TIMESSTART(ms)
End of each window (ms) TIMESEND, TIMESEND(ms)
Transmitter off time (ms) OFFTIME