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Hubble Space Telescope
FOC Instrument Handbook Version 6.0 List of Figures

List of Figures

Figure 1. Diagram showing the COSTAR correction principle for the f/96 relay - 8
Figure 2. A Schematic View of COSTAR showing the FOC light paths - 10
Figure 3. FOC Operational and Data Flow Block Diagram - 12
Figure 4. Schematic Drawing of the FOC - 13
Figure 5. The Transfer Optics Block Diagram - 17
Figure 6. The schematic optical layout of the two cameras - 18
Figure 7. FOC entrance apertures on the HST focal plane - 19
Figure 8. The camera entrance aperture for the f/96 relay - 20
Figure 9. The camera entrance aperture for the f/48 relay - 21
Figure 10. Normalized Emission Spectra of the Calibration LEDs - 24
Figure 11. Transmittance of the wide band filters on the f/96 filter wheels - 27
Figure 12. Transmittance of the visible medium band filters on the f/96 filter wheels - 28
Figure 13. Transmittance of the UV medium band filters on the f/96 filter wheels - 29
Figure 14. Transmittance of the neutral density filters on the f/96 filter wheels - 30
Figure 15. Transmittance of all the filters on the f/48 filter wheels - 31
Figure 16. Optical layout of the focal plane of the f/96 relay with the FUVOP - 34
Figure 17. The Physical Layout of the FOC Polarizers - 35
Figure 18. Image configurations of the f/96 relay for the three polarizers - 36
Figure 19. The major and minor principal transmittances of the three FOC polarizers - 36
Figure 20. Optical layout of the f/48 focal plane in the spectrograph mode - 39
Figure 21. Physical Layout of the Imaging Photon Counting Detectors - 40
Figure 22. Schematic Drawing of a Typical Raster Scan Output of the Detectors - 41
Figure 23. Radial profiles of pre-COSTAR aberrated PSF and COSTAR-corrected PSF at 4860A* - 48
Figure 24. The encircled energy fraction and PSF profile for the COSTAR-corrected f/96 and pre-COSTAR f/96 relays - 50
Figure 25. Variation of FWHM with wavelength for the f/96 relay of the FOC - 51
Figure 26. Images of PSFs taken with the COSTAR-corrected f/96 camera - 52
Figure 27. Flat-field linearity plots for the pre-COSTAR f/48 and f/96 detectors - 55
Figure 28. Linearity relation for point sources - 55
Figure 29. Baseline overall (OTA + COSTAR + FOC) absolute quantum efficiency - 58
Figure 30. Stray light illumination at the OTA focal plane - 62
Figure 31. The Earth's daylight radiance as a function of wavelength - 63
Figure 32. Contour plots of the vignetting function for the f/48 relay - 66
Figure 33. Contour plots of the smoothed flat field for both relays - 66
Figure 34. Plots across the UV flat field for both relays - 67
Figure 35. Ratio between external UV flat field and internal flat field for both relays - 67
Figure 36. The expected count rate as a function of wavelength for the F231M filter - 69
Figure 37. The 512z * 1024 format distortion field for the f/48 relay - 72
Figure 38. The 512z * 1024 format distortion field for the f/96 relay - 72
Figure 39. Mosaic of f/48 Images taken during the November 1994 test - 74
Figure 40. f/48 camera background as a function of time after camera switch-on - 75
Figure 41. Residual 1216 and 1304A* airglow contribution to the FOC background - 77
Figure 42. Zodiacal light contribution to the FOC background - 79
Figure 43. Exposure time required to reach a S/N = 10 on a B5V star - 88
Figure 44. Exposure time required to reach a S/N = 10 on a B5V extended source - 88
Figure 45. Flow diagram of FOC imaging data through the Routine Science Data Processing System - 92
Figure A1. External flat-field image taken with the pre-COSTAR f/48 relay - 101
Figure A2. External flat-field image taken with the pre-COSTAR f/96 relay - 102
Figure A3. Extended format image taken with the pre-COSTAR f/48 relay in spectrograph mode of an extended external object - 103
Figure A4. Central region of an FUVOP image taken with the COSTAR-corrected f/96 relay - 104

List of Tables

Table 1: Summary of FOC Performance Characteristics I. Imaging - 14
Table 2: Summary of FOC Performance Characteristics II. Spectroscopy - 15
Table 3: f/96 Optical Element Characteristics Ordered by Peak Wavelength - 25
Table 4: f/48 Optical Element Characteristics Ordered by Peak Wavelength - 26
Table 5: FOC Objective Prism Characteristics - 33
Table 6: f/96 IMAGE or OCC Modes - 44
Table 7: Target Acquisition Formats - 47
Table 8: Measured Energy Fraction for the f/96 Relay - 49
Table 9: Calculated Flat-Field Linearity Parameters - 53
Table 10: Overall (OTA+FOC+COSTAR) Absolute Quantum Efficiency - 57
Table 11: Format-Dependent Sensitivity Ratios - 60
Table 12: Zodiacal Light Intensities in S10 Units - 78
Table 13: Summary of Cycle 5 Calibration Programs - 95