How do you convert the integration time value in the SC4000/SC6000 header to seconds?

The integration time field in the SC4000/SC6000 header is not stored in units of time.  It is basically stored in units of clock pulses. In current versions of RTools and ExaminIR, this raw value is written to the POD file in the SAF movie. To get the value in milliseconds you can use the following formula:

Int_time (msecs) = ((POD_value + Offset)*tick)*1000

(POD_value + Offset) represents the total number of clocks during the integration period.    The tick is the clock period.  The offset is dependent on the ROIC type. The offset for SC4000/6000 is 93.  For example, a 1msec integration time requires 12500 clocks, so the value in the POD file would be 12407.

The next released versions of RTools (v2.4) and ExaminIR (v1.10.0) should start storing the integration time values in milliseconds directly so you won't have to do the conversion manually.

 

File Attachment(s)

Excell Add-in needed for time calc.jpg (23.26 KB)

Cumulus Int time calculator B.xls (26.50 KB)

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