Technology Lets Us See in the Dark!

Lessonlookup orienation - Chemical from lines, Two filters CI =  B-V  (-0.6 -2)

Course Notes

• Earth based observation

• Parallax
• Spectroscopy

• Determining distances
• Learn
• Do
• A.4.A solve problems and analyse information using:
   and to calculate the absolute or apparent magnitude of stars using data and a reference star
• A.4.B perform an investigation to demonstrate the use of filters for photometric measurements
• A.4.C identify data sources, gather, process and present information to assess the impact of improvements in measurement technologies on our understanding of celestial objects

Now in Australia we have the "Echidna" Telescopes

1. Robots place lenses with Optical Fibres on a live image taken by telescopes

                  a. While viewing, the robots place the next fibres down on the location of stars in galaxies, then swap plates.
2.The light is gathered and placed in a strip/line

3.The light is then sorted into colours by a diffraction grating. (2D)

4. The optical fibres bundle the star light into strips and deliver it to an image intensifier

5. The intensified light is the converted to electrons that are stored in pits,
6. After the electrons have accumulated the charge is bleed off in a linear queue to form the final image

What is the Difference between CCD and CMOS
CCD - charge builds up and is then drained out
CMOS - is a memory chip that allow read while expose, but extra memory read wires reduce active area.

Summary

Star                                                                    Generates light
Telescope                                                           Concentrates
Optical Fibre a star pick up                                 Picks out stars from image
Sky to line shaping                                              Generates line
Spectrum line to image                                         Creates spectrum
Image intensification                                            Intensifies
Image to digital signal                                          Collects and converts to digital image

Advantages
Spectra, and magnitudes taken all at once for comparison
Unwanted space filtered out
Light amplified, and stored, Image does not get over exposed
Image can be time sliced to take out drift and momentary disruption. (CMOS)
.

Scroll through this article and have a look at how the Japanese are Cherry picking and multiplexing the spectra, You can see the advantage of simultaneous scanning.