If I want to investigate sensitivity and sensing range for intensity, wavelength, fringes responses, what will differs between those two techniques? which one is the best technique?
Hello Ismail,I think both of these techniques have their distinct advantages and applications; albiet the limitations too. If you look at the intensity based displacement measurement technique, wavelength will be dominant factor which in turn is governed by the spectral sensitivity of your sensor. The lowest distance is dwtermined by sensitivity of you sensor, intensity of light source and any stray light and then offcourse the noise in your electronics.
On the other hand, when you talk about interferometry, it is obvious that you would use a monochromatic source to obtain the fringe pattern. In terms of resolution to micrometer or nano meter level, this technique would be the best. Off course, the sensitivity of sensor and noise do play their role here.I hope that you will get some insight into what you are looking for.Best wishes.
It depends on the application. An intensity-based sensor is cost-effective and simple, and a phase interferometric-based one has better resolution of displacement.
Following tutorial can be helpful for you.
G. Berkovic and E. Shafir, Advances in Optics and Photonics, 4(4), pp. 441-471 (2012).
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