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For AB_UVDAT daily irradiance integration is the sum of histograms that are as wide as the
average of the difference of the time for the following and the previous scan and as high as the
irradiance for that particular scan.
For the most representative daily integral values it is recommended that UV scans be taken
throughout the daylight hours at regular zenith angle intervals.
Histogram summation starts at the time of the first UV scan and stops at the time of the last UV
scan.
On a clear day without variable clouds or other aerosols the energy curve assumes a normal
distribution
Using AB_UVDAT.EXE
Input:
1.
A range of consecutive UVJJJYY.nnn files
2.
the appropriate UV response file.
Output:
1.
One UVOAVG.nnn file which tabelates the average values from the other output files.
2.
One UVBJJJYY.nnn file for each input file.
3.
One DUVJJJYY.nnn file for each input file.
1.
Create a test directory.
2.
Copy AB_UVDAT.EXE to the test directory.
3.
Copy the UV response file into the test directory.
4.
Copy the UV files to be processed into the test directory
5.
Run AB_UVDAT follow the directions given.
UV and UX Data Analysis Programs
RD_UX.EXE is used to reduce the UV data produced by the UA, UC, UF, UV, and UX routines.
The input file is in units of raw counts per second and outputs may be chosen units of in W/m
2
or in mW/m
/nm.
Instructions:
1.
Create a test directory and copy RD_UX from the uv_lamps directory to the test directory.
2.
Copy the UL or XL file(s) that you wish to process to the test directory.
3.
Create a /nnn directory in your test directory (nnn is your Brewer number).
4.
Copy the appropriate UV response file into the /nnn directory.
5.
Run the RD_UX program and follow the directions given.
6.
A list of all scans is displayed and the user is asked to select the scans to be used.
7.
The user will then be asked whether or not to correct for stray light – the stray light correction
subtracts the average of the counts below 292.2 nm from each measurement.
8.
A single processed file will be prefixed by the letter "P" such as, PUVJJJYY.nnn. If individual
files for each scan were requested, then individual files of the form PUVJJJSS.nnn will be
produced - where SS is the sequence of the scan.
9.
The PUV file (or files) represent the irradiance of the UV scans.
MKIII OPERATOR'S MANUAL
APPENDIX C UV PROCESSING
2
/nm
87
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