KI Nuller Data Products
Spectrometer (.nullspec) File
Spectrometer files are ASCII text files that contain the narrow-band L-1 data for KI. The following gives an example of a line from a KI summary file:
NULLSPEC ../../../2001/05:46:51 5.780970 HDC202240 5.965783 40.000000 0.837 500 0 KI_K1K2
4 2.400 175.8 0.645 0.482 1.200 2.300 195.8 0.569 0.420 1.200 2.200 189.1 0.507 0.369 1.200
2.100 122.7 0.488 0.343 1.200
The line consists of a number of space-delimited fields. The meanings of these fields are summarized in the table below. Each line corresponds to an average of all the data in one integration on a source. All entries, including time and delay line position, are mean values. A # as the leading character indicates a comment.
|
field# |
content |
comments |
|---|---|---|
|
|
NULLSPEC |
File identifier. Each line starts with NULLSPEC to support the grep extraction mechanism from the intermediate data file produced by the L1 reduction code (nuller_l1). |
|
|
Observation Date (string) |
UTC date of the observation (mm/dd/yyyy/hh:mm:ss) |
|
|
Observation Time (float) |
Start of observation time (decimal UTC hours) |
|
|
Source Designation (string) |
Source designation (ASCII string) |
|
|
FDL Optical Path (float) |
Mean fast delay line optical path difference (m) |
|
|
LDL Optical Path (float) |
Mean long delay line optical path difference (m) |
|
|
Number of Cycles (int) |
Number of cycles in measurement |
|
|
Gated Cycles (float) |
Percent cycles that pass quality gates |
|
|
Duration (int) |
Duration of measurement (sec) |
|
|
Mode (int) |
Signifies nulling measurement mode used |
|
|
Ports (string) |
Ports used in measurement (IN, OUT, or IN+OUT) |
| 12 |
L1 Data Producer (string) |
Which code produced this L1 file
(Nx.y or Mx.y) (N=nuller_l1, M=Colavita code, x.y=version) |
| 13 |
Calibration Flag (int) |
Data quality flag |
| 14 |
Baseline (string) |
Baseline designation |
| 15 |
Number Spec Channels (int) |
Number of spectral channels |
Then, for each pixel ("spectral channel") i=1..n, the following fields are given:
|
field# |
content |
comments |
|---|---|---|
|
16 + 8*(i - 1) |
Wavelength (float) |
Effective wavelength (microns) |
|
17 + 8*(i - 1) |
Flux (float) |
KALI flux. (DN units) |
|
18 + 8*(i - 1) |
Null Leakage (float) |
Null leakage |
|
19 + 8*(i - 1) |
Null Leakage Error (float) |
Null leakage error |
|
20 + 8*(i - 1) |
rNN (float) |
Real part null-null fringe |
| 21 + 8*(i - 1) |
jNN (float) |
Imaginary part null-null fringe |
| 22 + 8*(i - 1) | rPP (float) |
Real part peak-peak fringe |
| 23 + 8*(i - 1) | jPP (float) |
Imaginary part peak-peak fringe |
Last updated: Feb 13, 2008