1. Photoelectric Effect
Photon and Charge Amplification and their use in NVDs (Night Vision Devices)

2. Photoelectric Effect Photonelectric Effect
Energy from Photons knock electrons off a metal.
Einstein
Photons behave like little particles of energy
E=hf
KE=hf-ϕ

3. Image Intensifier Converts Visibe Light from Dim image into Bright oneIR
Strikes Charged Photocathode plate
very low work function
Electrons Released hit screen and create image visible to human eye

4. Charge Coupled Device Analog Shift Register Photoactive region
Transportation of electrical charges controlled by a clock
Form a memory of electrical signals
Serialize parallel analog signals
Used in digital imaging
Combined with Charge Amplifier
Convert Charge to Voltage
Done with output impedence

5. Intensified CCD Essential has image intensifier attached to a CCD
Photons are converted into visible light.
CCD captures this and turns into digital image.
ICCD Cameras allow single photon detection
Very sensitive

6. Night Vision Device