Sample Essay

What is the difference between the first and third generation night-vision devices? Does the size of the object change the range of the devices? Explain why.

In the first generation night-vision devices, incident rays from the focusing lens fall on a dynode which generates electrons which in turn illuminate a phosphorus screen to generate the image.  In the third generation devices the electrons are amplified using a micro channel plate made up of glass with micrometer holes. The size of the object does not change the range of the devices as the imaging lens has remained the same in both generations (Global Security).

 The S/N for an IR system detecting a target is with radiation intensity of 600 W/sr at a wavelength of 8 m. The distance between the target and the receiver is 1 km and the receiver has a lens with 50 cm diameter. The optical transmittance is 0.4 and sensitivity of the detector is -35 dBm over 1 Hz bandwidth.

 In Q2, the target is located at an angle close to the sun. Can you predict if the heat from the sun can cause interference? Assume no filtering in your system.

Yes It would interfere.

  Can you use crystal video receiver in a dense environment? Explain why

The Crystal Video Receiver (CVR) offers a simple wide band detector and receiver solution , however, because of its simplicity and lack of filters and the limited amount of physical components which can be used to detect the background,  CVR cannot be used in a dense environment (Adamy 52).

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