Question

Depending on the application, the choice of image sensors can be very different. Based on your understanding, what are the factors that may affect your choice of sensors for...

(a) a microscope used for circuit surface imaging?

(b) a camera that is equipment on Hubble telescope?

Answer 1

The factors which may affect the choice of sensors are i] Imaging Wavelength:

in a microscope, the wavelength is UV or visible range whereas for a Hubble Space Telescope camera, the wavelength is in infrared region.

ii] Response time of the photodetector:

in a microscope, multiple short duration images are captured which require very low response time whereas in the Telescope case, the light must be accumulated for a certain extended time (long exposures) for capturing light from distant objects and so the response time can be relaxed.

iii] Size of the sensor:

From Rayleigh's diffraction limit criteria, the size of the sensor needed for a microscope is small as compared to the size of the sensor in the telescope case.