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The APT has the following filters available:
• Ultraviolet (R)
• Blue (B)
• Visible (V)
• Visible Red (VR)
• Infrared (I)
• Clear
E.5. Flat fielding
Flat Fielding refers to the process of calibrating the CCD to account for irregularities in the optics
and errors within the CCD itself. A reference image is taken when the CCD is expected to return
an image of constant intensity, such as the twilight sky. Any flaws in this reference image can be
used to correct images obtained in the future.
This is not to be confused with the focal plane within the Telescope, which has been flattened
using a field-flattening lens. Originally, images were obtained from the APT using photographic
film which was placed in a spherical shaped collection area within the telescope. Because the
CCD cannot be placed on a curved surface, the optics were modified with the addition of a
lens to make the telescope focal plane flat out to a diameter of 5 degrees.
E.6. Cosmic rays
Cosmic Rays or Cosmic Radiation, in simple terms, refers to energised particles travelling in all
directions throughout the universe. Very little is known of there origin. Optical astronomers are
concerned with cosmic rays as they can affect images obtained with the CCD. If a cosmic ray
strikes the CCD, the resulting image will falsely appear to show a bright star
To counteract this phenomenon, astronomers will typically take three images in succession, and
compare the results to identify any spurious data caused by cosmic rays.
- Oliver Mather 1
- Abstract 3
- Acknowledgements 5
- Contents 7
- List of Figures 9
- 1 Introduction 11
- 2 APT hardware 13
- 2.3 Mistral 14
- 2.4 Telescope 14
- 2.5 CCD 16
- 2.6 Telescope movement 16
- 2.6.1 Anti backlash motor 17
- 2.6.2 Limit switches 18
- 2.6.3 Tilt sensor 19
- 2.6.4 Macrostation 19
- 2.7 Masterswitch 20
- 2.8 Web cameras 21
- 2.10 Roof 22
- 2.11 ROTSE 23
- ParralelRS232RS232 24
- 3 APT software 25
- 3.3 Command line tools 26
- 3.4.1 Introduction 27
- 3.4.2 Architecture 27
- 3.5 APT server 28
- 4.1 Introduction 31
- 4.3 Code 32
- 4.3.2 Configuration 33
- 4.3.3 SNMP messages 33
- 4.4 JAS integration 34
- 4.4.1 Commands 35
- 4.4.2 Messages 36
- 4.5 Screenshots 37
- 4.6 Conclusion 38
- 5.1 Introduction 39
- 5.2 Architecture 40
- 5.3 Process manager 40
- 5.4 Roof 41
- 5.5 Chat system 43
- Figure 5-8 APT chat system 44
- 5.6 Look and Feel 45
- 5.6.2 Problems 46
- 5.6.3 Screenshots 46
- 5.7 Conclusion 47
- 6 APT software deployment 49
- 6.3.1 Versioning 50
- 6.3.2 Security 51
- 6.4 Compilation 52
- 6.5 Version synchronisation 55
- 6.6 Uploading 56
- 6.7 Conclusion 57
- 7.1 Introduction 59
- 7.2 Hardware 59
- 7.3 Software 59
- 7.3.2 Maintenance 60
- 7.3.3 Client SP server 60
- 7.3.4 Client error control 60
- 7.4 Conclusion 62
- 8 SkinnedTextField 63
- 8.4 TextSkin 64
- 8.5 SkinnedTextFieldDemo 65
- 9 CSIRO SEARFE project 69
- 9.3 Requirements 70
- 9.4 Hardware 71
- 9.5 Architecture 71
- 9.5.1 Data files 72
- 9.6 User interface 73
- 9.6.2 Data visualisation 76
- 9.7.1 Visualisations 80
- 9.8 Conclusion 81
- 10 Conclusion 83
- 10.4 Logging analysis 84
- Bibliography 87
- A. Glossary 89
- B.1. Introduction 91
- B.2. JAS message sender 91
- B.4. Creating JAS commands 91
- B.4.1. JASCommand object 92
- B.4.2. Installing commands 92
- B.5. JAS channel monitoring 93
- C. Software tools 95
- C.1.3. Checkout the code 96
- C.1.4. CVS user interfaces 96
- D. SNMP overview 97
- Response 98
- RequestRequest 98
- E. Astronomy primer 99
- E.1.3. Coordinate epochs 100
- E.2. Astronomical times 101
- E.3. Gamma ray bursts 102
- E.4. Astronomical filters 102
- E.5. Flat fielding 103
- E.6. Cosmic rays 103
- F. Selected code listings 105
- F.1.6. SnmpTrapDaemon.java 121
- F.2. APT deployment system 132
- F.2.3. apt build.xml 134
- F.2.4. lib build.xml 141
- F.3. CSIRO / SEARFE 144
- F.4. TextSkin 145
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