The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 30, 2021
Filed:
Jun. 07, 2019
Trumpf Photonic Components Gmbh, Ulm, DE;
Petrus Theodorus Jutte, Eindhoven, NL;
Johannes Hendrikus Maria Spruit, Eindhoven, NL;
Alexander Marc Van der Lee, Eindhoven, NL;
Joachim Wilhelm Hellmig, Eindhoven, NL;
Roy Ovink, Eindhoven, NL;
Ralph Engelbertus Theodorus Gudde, Eindhoven, NL;
TRUMPF PHOTONIC COMPONENTS GMBH, Ulm, DE;
Abstract
A laser sensor for detecting a particle density includes: a laser configured to emit a measurement beam, an optical arrangement being arranged to focus the measurement beam to a measurement volume, the optical arrangement having a numerical aperture with respect to the measurement beam, a detector configured to determine a self-mixing interference signal of a optical wave within a laser cavity of the laser, and an evaluator. The evaluator is configured to: receive detection signals generated by the detector in reaction to the determined self-mixing interference signal, determine an average transition time of particles passing the measurement volume in a predetermined time period based on a duration of the self-mixing interference signals generated by the particles, determine a number of particles based on the self-mixing interference signals in the predetermined time period, and determine the particle density based on the average transition time and the number of particles.