Lots of information about displacement sensor, laser sensor, and velocity measurements are explained in the paper. The paper presents info related to measurement, sensors, and sensor.
Inside this paper you can find description such as laser, noise, and laser diode. These are some excerpt from the paper:
We have developed a new algorithm based on the extended Kalman ﬁlter in order to improve the resolution of a selfmixing (SM) optical displacement sensor. This noncontact sensor, which provides vibration measurement with a very high accuracy, can be used for online quality control, for example, measuring the damping of excited mechanical structures. This SM sensor subject to weak feedback has been tested in comparison with a commercial vibrometer in order to measure the frequency response function (FRF) of a plate with a passive damping to be characterized, and to show the efﬁciency of a damping treatment.
Furthermore, this paper contains info about measurements, displacement measurements, and vibrometer.