Photographic Plate Processing

• Cal This is the subtask for establishing the synthetic calibration of photographic density curve.
  • Phot. scale Here the name of the photographic scale is chosen. Each scale name must be given in LOGINT.DAT file together with the number of wedges and their relative intensities
  • Calc coefs The coefficients of the polynomial fit of density curve are established here.
    • Measure plate It calls the microphotometer driver which scans the plate across its dispersion axis to get the information about photometric wedges and the fog. The scanned data are saved to file *.CC3. Than the on-screen interactive edition is called, where the mean intensity of both wedge and fog is set. The same repeats for another position on the plate. The transparency of each wedge is saved to file *.CTR. After finishing (typically 4-6 perpendicular cuts) the synthetic calibration curve is displayed (with the possibility of deleting points with large error) and polynomial coefficients of the fit are calculated and saved to *.CAL file.
    • Read transp file The already measured *.CTR file is read and after the synthetic calibration edition the *.CAL file is produced.
  • Read coefs Just the *.CAL file is read.
• Star The main part of stellar plate processing.
  • Measure plate The microphotometer driver is called that scans the plate along the dispersion axis and each channel produces files *.CH1, *.CH5 for comparison spectra, *.CH2, *.CH4 for the fog and *.CH3 for the star scan. Then the comparison lines from particular *.CMP list are identified interactively in oscilloscopic or automatic mode. The dispersion curve is displayed with the possibility of deletion of points with large errors. The protocol of comparison line measurement *.CMF is produced. The transparencies of wavelength calibrated stellar spectrum is written into *.TRN file and finally the intensity file *.UUI is produced using the particular calibration density curve.
  • Reduce data The same as above, just using already prescanned *.CH1 - *.CH5 files.
  • Transp to int Just the transformation from *.TRN to *.UUI file.