Low cost velocity sensor based on the self-mixing effect in a laser diode

L. Krehut*, J. Hast, E. Alarousu, R. Myllylä

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

In this paper, a low cost velocity sensor based on the self-mixing effect in a laser diode is described. Theory of the self-mixing effect in the laser diode is shortly presented. Experimental velocity measurements are presented in order to evaluate the operation of the velocity sensor. In the design, the attention is focused to develop a budget sensor, which frequency response of the detection electronics is up to 85 MHz. This limits the maximum measurable velocity to 27.5 m/s. The total material costs of the velocity sensor were 234 euros. The experimental measurements conducted so far show that the linearity of the developed velocity sensor is at least as good as that of a mirror moved by a translation stage with velocities ranging from 1.0 to 48.5 mm/s. The velocity of the translation stage was controlled by a computer. When the mirror velocity is lower than 20 mm/s, the maximum relative precision with the mirror velocity is less than 3.5%. When the mirror velocity is higher than 20 mm/s the relative precision with the mirror velocity is below 0.5%. In an additional experiment with a vibrating loudspeaker's membrane, it is also demonstrated that a maximum Doppler frequency is clearly detectable over the noise level at 12.5 MHz.

Original languageEnglish (US)
Pages (from-to)313-319
Number of pages7
JournalOpto-electronics Review
Volume11
Issue number4
StatePublished - 2003
Externally publishedYes

Keywords

  • Doppler frequency
  • Laser diode
  • Self-mixing effect
  • Velocity sensor

ASJC Scopus subject areas

  • Radiation
  • Electrical and Electronic Engineering

Fingerprint

Dive into the research topics of 'Low cost velocity sensor based on the self-mixing effect in a laser diode'. Together they form a unique fingerprint.

Cite this