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

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Presentation transcript:

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

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  

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

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

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

Night Vision Device