  Optical tweezers find applications in various fields, ranging from biology to
physics. One of the fundamental steps necessary to perform quantitative
measurements using trapped particles is the calibration of the tweezer's spring
constant. This can be done through power spectral density analysis, from
forward scattering detection of the particle's position. In this work, we
propose and experimentally test simplifications to such measurement procedure,
aimed at reducing post-processing of recorded data and dealing with acquisition
devices that have frequency-dependent electronic noise. In the same line of
simplifying the tweezer setup, we also present a knife-edge detection scheme
that can substitute standard position-sensitive detectors.
