Kipp&Zonen Brewer MkIII - Manual (Page 89)

MKIII OPERATOR'S MANUAL 86
Lamp Irradiance Files
RD_UX.EXE is used to process external lamp scans from the XL or UL routine to produce lamp
irradiance files. The input files are in units of raw counts per second, the output files have units of
W/m
2 /nm or mW/m 2 /nm.
Instructions:
1. Create a test directory and copy RD_UX from the uv-lamp 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. A single processed file will be prefixed by the letter "P" such as, PXLJJJYY.nnn. If individual
files for each scan were requested, then individual files of the form PXLJJJSS.nnn will be
produced - where SS is the sequence of the scan.
8. The P file (or files) represent the irradiance of the lamp used.
UV DATA ANALYSIS PROGRAMS
AB_UVDAT.EXE processes multiple UVJJJYY.nnn files in a similar fashion to the UV.RTN and the
UVSUM.RTN except that integrated results are tabulated along with data from the individual
wavelengths.
AB_UVDAT, UVSUM.RTN and UV.RTN have a UVA correction built into the weighting curves.
Calculated results represent both the UVB and UVA regions (290-400nm).
AB_UVDAT creates two data files, UVBJJJYY, and DUVJJJYY, for each UV file processed, and
appends to a third file, UVOAVG.
Two action spectra, Erythema and Diffey, are used separately to weight the UV scans.
AB_UVDAT requires access to the appropriate instrument response file.
The integration technique used in UV.RTN, UVSUM.RTN and AB_UVDAT is one of histogram
summation with the following properties.
The raw counts in the UV file are converted throughout to counts per second and corrected for
instrument dead time.
The average of the counts recorded at wavelengths <=292nm represent a dark count (noise) value
and is subtracted from all other wavelengths.
The corrected raw counts are then divided by the instrument response values and multiplied by the
appropriate weighting value at each wavelength.
Scan integration is then the sum of the histograms, each 0.5 nm wide and as high as the corrected
weighted irradiance.
For the UVSUM.RTN, daily irradiance integration is the sum of histograms that are as wide as the
time between consecutive scans and as high as the average of the irradiance of two consecutive
scans.