STScI Logo

Hubble Space Telescope
FOC Instrument Handbook Version 5.0 List of Figures

List of Figures

Figure 1. COSTAR correction principle for pre-COSTAR f/96 relay - 3
Figure 2. COSTAR deployed showing FOC light path - 5
Figure 3. FOC Operational and Data Flow Block Diagram - 7
Figure 4. A Schematic Drawing of the FOC - 8
Figure 5. The Transfer Optics Block Diagram - 13
Figure 6. The Schematic Optical Layout for the New Cameras - 14
Figure 7. Location of the FOC Entrance Apertures on HST Focal Plane - 16
Figure 8. The New f/96 Camera Entrance Aperture - 17
Figure 9. The New f/48 Camera Entrance Aperture - 18
Figure 10. Normalized Emission Spectra of the Calibration LEDs - 20
Figure 11. Transmittance of the Long Pass and Wide Band Filters for the New f/96 relay - 24
Figure 12. Transmittance of the Visible, Medium and Narrow Band Filters for the New f/96 Relay - 25
Figure 13. Transmittance of the UV Medium Band Filters for the New f/96 Relay - 26
Figure 14. Transmittance of the Neutral Density Filters for the New f/96 Relay - 27
Figure 15. Transmittance of all the Filters for the New f/48 Relay - 28
Figure 16. Optical Layout of the Focal Plane of the New f/96 Relay with the Objective Prism - 32
Figure 17. The Physical Layout of the FOC Polarizers - 32
Figure 18. Image Configurations on the Focal Plane of the New f/96 Relay for the Polarizers - 33
Figure 19. Transmittance of the Polarizers - 33
Figure 20. Optical Layout of the Focal Plane for the New f/48 Relay with the FOPCD - 36
Figure 21. Physical Layout of the Imaging Photon Counting Detectors - 37
Figure 22. Typical Raster Scan Output of the Detectors - 39
Figure 23. Radial profiles of pre-COSTAR aberrated PSF and COSTAR-corrected PSF - 47
Figure 24. The encircled energy fraction and PSF profile for the COSTAR-corrected f/96 and pre-COSTAR f/96 relays - 49
Figure 25. Images of PSFs taken with the COSTAR-corrected f/96 camera through the F486N, F120M, and F372M filters - 50
Figure 26. Flat-field Linearity Plots for Both Relays - 53
Figure 27. Point Source Non-linearity Characteristics - 53
Figure 28. Baseline Overall (OTA+COSTAR+FOC) Central Absolute Quantum Efficiency - 56
Figure 29. Increase in the background count rate over time in the new F/48 relay - 60
Figure 30. Stray Light Illumination in V Magnitudes - 61
Figure 31. The Earth's Average Daylight Nadir Radiance in Rayleighs - 62
Figure 32. Plot of Vignetting Function for the Extended Format for the New f/48 Relay - 65
Figure 32. Plot of Vignetting Function Along the Spectrographic Slit - 65
Figure 33. Contour Plots of Flat Field Images for the New Relays - 65
Figure 34. Plot Across a Row of UV Flat Field Images for the New Relays - 67
Figure 35. Ratio of External to Internal Flat Field Images for the New f/48 and the New f/96 Relays - 67
Figure 36. The Expected Monochromatic Count Rate for the New f/96 Camera - 69
Figure 37. The Overall (Optical + Detector) Distortion Field for the New f/48 Relay - 71
Figure 38. The Overall (Optical + Detector) Distortion Field for the New f/96 Relay. - 71
Figure 39. Residual 1216 and 1304 Airglow Contribution - 76
Figure 40. Zodiacal Light Contribution to the FOC Background Counting Rate - 77
Figure 41. Exposure Time Required to Reach S/N = 10 (point source) - 86
Figure 42. Exposure Time Required to Reach S/N = 10 (extended source) - 86
Figure 43. Flow Diagram of the FOC Imaging Data - 89
Figure A1. Extended Format (512) pre-COSTAR f/48 Image - 92
Figure A2. Extended Format pre-COSTAR f/96 Image - 93
Figure A3. Extended Format pre-COSTAR f/48 Spectrographic Image - 94
Figure A4. 512 Format pre-COSTAR F/96 Far-UV Objective Prism Image - 95
Figure A5. Extended Format pre-COSTAR f/48 Image Showing - High Background Features - 96

List of Tables

Table 1. Summary of FOC Performance Characteristics I. Imaging - 10
Table 2. Summary of FOC Performance Characteristics II. Spectroscopy - 11
Table 3. The Optical Element Characteristics for the New f/96 Relay - 22
Table 4. The Optical Element Characteristics for the New f/48 Relay - 23
Table 5. FOC Objective Prism Characteristics - 31
Table 6. Standard Imaging, Occultation, and Spectrographic Modes - 42
Table 7. Target Acquisition Formats - 46
Table 8. Measured Energy Fraction for the New f/96 Relay - 48
Table 9. Calculated Flat-Field Linearity Parameters - 52
Table 10. Overall (OTA+COSTAR+FOC) Absolute Quantum Efficiency - 55
Table 11. Format-Dependent Sensitivity Ratios - 58
Table 12. Zodiacal Light Intensities in S10 Units - 75