Charge-Coupled Devices (CCDs)
(or: How My Digital Camera Works)
Manhattan East Middle School
Summer Research Program for Science Teachers
- Understand how CCDs are constructed, collect light, and create a digital signal.
- Illustrate how a CCD collects photons given a variety of conditions.
- Describe sources of CCD noise and their causes.
1. read noise
2. dark current3. cosmic rays
- A lot of beans
- 25 small paper cups
- Paper and pencil
- Charged-Coupled Devices Handout
1. Using the handout titled, “Charge-Coupled Devices – CCDs”, read the “How it Works Section” with students aloud and identify the parts of the CCD as they relate to the demo:
- one cup = one pixel
- each bean = one electron
- baseball = cosmic ray
- paper = lens cap
2. Have each group gather their supplies and set up their rows of cups. Make sure students set up a 5 by 5 grid of cups and have enough beans to fill at least 6 cups. Each group also needs a baseball and a piece of paper.
3. Have students work though each of the scenarios, first using the beans and cups to see what is going on, and then answering the questions as a group aloud.
4. Go over the correct scenario and answers with the class before moving on to the next scenario.
5. Complete quiz as a wrap up, or the next day as a “do now” to asses student learning and/or retention.
S6. Interconnectedness: Common
Key Idea 2: Models are simplified representations of objects, structures, or systems used in analysis, explanation, interpretation, or design.
S7. Interdisciplinary Problem Solving: Strategies
Key Idea 2: Solving interdisciplinary problems involves a variety of skills and strategies, including effective work habits; gathering and processing information; generating and analyzing ideas; realizing ideas; making connections among the common themes of mathematics, science, and technology; and presenting results
S4. Students will understand and apply scientific concepts, principals, and theories pertaining to the phyical setting.
Key Idea 1: Performance Indicator 1.2: Describe current theories about the origin of the universe and solar system.
Major Understandings: 1.2a The universe is vast and estimated to be over ten billion years old. The current theory is that the universe was created from an explosion called the Big Bang. Evidence of this theory includes:
1. cosmic background radiation
2. a red-shift (the Doppler effect) in the light from very distant galaxies