Laser sensor for multi parameter detection

A laser sensor module comprising:

• at least one first laser;
• at least one first detector;
• at least one electrical driver;
• and
• at least one first optical device;
• wherein the first laser is arranged to emit a first laser light based on signals provided by the at least one electrical driver,
• wherein the first optical device is arranged to focus the first laser light on a focus region,
• wherein the laser sensor module is arranged to control a distance between the laser sensor module and the focus region such that there are at least a first mode and a second mode of the laser sensor module,
• wherein in the first mode the focus region is at a first distance and in the second mode the focus region is at a second distance,
• wherein the second distance is different than the first distance,
• wherein the at least one first detector is arranged to detect a first self-mixing interference signal of an optical wave within a first laser cavity of the first laser,
• wherein the first self-mixing interference signal is caused by a first reflected laser light reentering the first laser cavity,
• wherein the first reflected laser light is received in the first mode,
• wherein the first self-mixing interference signal is used to determine a first physical parameter,
• wherein the first physical parameter is related to a movement of an object,
• wherein the laser sensor module is arranged to detect a second self-mixing interference signal contemporaneously with detecting the first self-mixing signal,
• wherein the second self-mixing interference signal is caused by a second reflected laser light,
• wherein the second self-mixing interference signal is determined in the second mode,
• wherein the second self-mixing interference signal is used to determine a second physical parameter being related to a detection of a particle density or a particle size,
• wherein the second physical parameter is different than the first physical parameter.