Trumpf Photonic Components Gmbh

Koninklijke Philips Corporation N.v.

Robert Boschgmbh

Siemens Healthineers Nederland B.v.

Asml Netherlands B.v.

Philips Photonics Gmbh

Koninklijke Philips Electronics N.v.

Philips Intellectual Property & Standards Gmbh

Alexander Marc Van Der Lee

Holger Joachim Moench

Johannes Hendrikus Maria Spruit

Joachim Wilhelm Hellmig

Petrus Theodorus Jutte

Mark Carpaij

Hans Spruit

Okke Ouweltjes

Coen Adrianus Verschuren

Johannes Joseph Hubertina Barbara Schleipen

Albert Hendrik Jan Immink

Dominique Maria Bruls

Thea Van Der Wijk

Cornelis Reinder Ronda

Marcel F Schemmann

Gerben Kooijman

Arnoldus Johannes Martinus Jozeph Ras

Robert Wolf

Femke Karina De Theije

Philip Steven Newton

Frank Fischer

Gert Wim 't Hooft

Stephan Gronenborn

Gael Pilard

Koray Karakaya

Reiner Schnitzer

Egbert Lenderink

Philipp Henning Gerlach

Carsten Heinks

Robert Frans Maria Hendriks

Ulrich Weichmann

Stefan Weiss

Marcel Franz Christian Schemmann

Rene Monshouwer

Alexander Herrmann

Jeroen Veen

Marcel F C Schemmann

Robert Weiss

Balazs Jatekos

Jochen Hellmig

Jens-Alrik Adrian

Sören Sofke

Roy Ovink

Meng Han

Pascal De Graaf

Niklas Dittrich

Matthias Falk

Bernd Engelbrecht

Anthonius Petrus Gerardus Emanuel Janssen

Donato Pasquariello

Stefan Schwan

Ralph Engelbertus Theodorus Gudde

Rico Srowik

Holger M Moench

Jeroen Dragt

Wolfram Johannes Martin Lyda

Pieter Hoeven

Antoniu Emilius Theodorus Kuiper

Dominik Moser

Johannes Henrikus Maria Spruit

Femke Karina De Theije E/v Wijgergangs

Peter Jutte

Holger Joachim MÖNCH

Holger Joachim MÖENCH

Philipp G Gerlach

André Albert Hendrik Jan Immink

A laser sensor module includes a laser diode configured emit a laser beam, an electrical driver configured to supply the laser diode with a driving current to stimulate emission of the laser beam, a detector, and an optical arrangement configured to focus the laser beam to a focus region. The laser diode is arranged to emit the laser beam through the optical arrangement to the focus region. The optical arrangement comprises an emission window. The detector is arranged to determine an interference signal. The laser sensor module comprises a soiling detection unit configured to vary a wavelength of the laser beam with a variation amplitude over a predetermined time period to provide a soiling detection signal indicative of a soiling of the emission window based on an interference signal during the wavelength variation of the laser beam.

Laser sensor module with soiling detection

A laser sensor module includes a first laser source configured to emit first modulated light, the first modulated light being modulated laser light. The laser sensor module further includes circuitry configured to drive the first laser source with a first modulated driving current to cause the first laser source to emit the modulated laser light, a detector configured to detect the modulated laser light, which induces a photocurrent with variations resulting from modulation of the modulated laser light, and a second laser source configured to emit second modulated light. The circuitry is further configured to drive the second laser source with a second modulated driving current to cause the second laser source to emit the second modulated light. The detector is configured to detect the second modulated light. The circuitry is configured to adapt the amplitude of the second modulated driving current to induce a contribution to the photocurrent.

Laser sensor module for self-mixing interferometry

A laser sensor module for detecting a particle density of small particles with a particle size between 0.05 &#x3bc;m and 10 &#x3bc;m includes a first laser configured to emit a first measurement beam, a second laser configured to emit a second measurement beam, and an optical arrangement configured to focus the first measurement beam to a first measurement volume and to focus the second measurement beam to a second measurement volume. The optical arrangement includes a first numerical aperture and a second numerical aperture arranged to detect a predetermined minimum particle size. The laser sensor module further includes a first detector configured to determine a first self-mixing interference signal of a first optical wave, a second detector configured to determine a second self-mixing interference signal of a second optical wave, and an evaluator.

Optical particle sensor module

The invention relates to a method for detecting particles, having the steps of: receiving (S) a measurement signal; calculating (S) at least one estimated noise value using the received measurement signal; and detecting (S) the particles using the measurement signal on the basis of at least one detection criterion, wherein the at least one detection criterion depends on the at least one calculated estimated noise value.

Method and apparatus for detecting particles

The invention relates to a method for determining the absolute value of the flow velocity (v) of a particle-transporting medium. At least two measurement laser beams (L_i) with linearly independent, non-orthogonal measurement directions (b_i) are emitted. The measurement laser beams (L_i) scattered at particles are detected and one measurement signal (m_i) is generated in each case for each measurement laser beam (L_i). The measurement signals (m_i) are evaluated, wherein absolute values of velocity components (v_i) are ascertained as projections of the flow velocity (v) on the respective measurement directions (b_i), wherein a solid angle region is ascertained for the prevalent direction of the flow velocity (v) and signs assigned to this solid angle region are chosen for the individual velocity components (v_i), and wherein the absolute value of the flow velocity (v) is determined using the ascertained absolute values of the velocity components (v_i) and using the chosen signs for the velocity components (v_i).

Method and apparatus for determining the absolute value of the flow velocity of a particle-transporting medium

The invention describes a laser sensor or laser sensor module () using self-mixing interference for particle density detection, a related method of particle density detection and a corresponding computer program product. The invention further relates to devices comprising such a laser sensor or laser sensor module. It is a basic idea of the present invention to detect particles by means of self-mixing interference signals and determine a corresponding particle density. In addition at least a first parameter related to at least one velocity component of a velocity vector of the particles is determined in order to correct the particle density if there is the relative movement between a detection volume and the particles. Such a relative movement may for example be related to a velocity of a fluid transporting the particles (e.g. wind speed). Furthermore, it is possible to determine at least one velocity component of the velocity of the particles based on the self-mixing interference signals.

Laser sensor for particle detection

The invention relates to a method for the detection of target components that comprise label particles, for example magnetic particles (). The method includes (a) collecting the target components at a binding surface () of a carrier (); (b) directing an input light beam (L, L, L) into the carrier such that it is totally internally reflected in an investigation region () at the binding surface (); and (c) determining the amount of light of an output light beam (L, L, L) that comprises at least some of the totally internally reflected light. Evanescent light generated during the total internal reflection is affected (absorbed, scattered) by target components and/or label particles () at the binding surface () and will therefore be missing in the output light beam (L). This can be used to determine the amount of target components at the binding surface () from the amount of light in the output light beam (L, L, L). A magnetic field generator () is optionally used to generate a magnetic field (B) at the binding surface () by which magnetic label particles () can be manipulated, for example attracted or repelled.

Method of detecting label particles

The invention relates to an optical lens () for a photodiode-equipped device, which is arrangeable at and/or in the photodiode-equipped device in such a way that light beams () emitted by at least two photodiodes of the photodiode-equipped device transmit into the optical lens () through a light entrance side (S) of the optical lens () and emerge from the optical lens () at a light exit side (S) of the optical lens (), and for which a central longitudinal axis () extending centrally through the light entrance side (S) and centrally through the light exit side (S) is definable, wherein the light entrance side (S) of the optical lens () and the light exit side (S) of the optical lens () are embodied in each case as a freeform surface for off-axis projection in such a way that the light beams () emitted by the photodiodes () arranged on a circular path around the central longitudinal axis () are focused off-axis by means of the optical lens ().

Optical lens for a photodiode-equipped device

The invention relates to a carrier with a binding surface at which target components that comprise label particles, for example magnetic particles, can collect and optionally bind to specific capture elements. An input light beam (L) is transmitted into the carrier and totally internally reflected at the binding surface. The amount of light in the output light beam (L) and optionally also of fluorescence light emitted by target components at the binding surface is then detected by a light detector. Evanescent light generated during the total internal reflection is affected (absorbed, scattered) by target components and/or label particles at the binding surface and will therefore be missing in the output light beam (L). This can be used to determine the amount of target components at the binding surface from the amount of light in the output light beam (L, L, L). A magnetic field generator is optionally used to generate a magnetic field (B) at the binding surface by which magnetic label particles can be manipulated, for example attracted or repelled.

Carrier for detecting label particles

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.

Laser sensor module for particle density detection

The invention describes a laser sensor module () for detecting ultra-fine particles () with a particle size of 300 nm or less, more preferably 200 nm or less, most preferably 100 nm or less, the laser sensor module () comprising: &#x2014;at least one laser () being adapted to emit laser light to at least one focus region in reaction to signals provided by at least one electrical driver (), &#x2014;at least one detector () being adapted to determine a self-mixing interference signal of an optical wave within a laser cavity of the at least one laser (), wherein the self-mixing interference signal is caused by reflected laser light reentering the laser cavity, the reflected laser light being reflected by a particle receiving at least a part of the laser light, &#x2014;the laser sensor module () being arranged to perform at least one self-mixing interference measurement, &#x2014;the laser sensor module () being adapted to determine a first particle size distribution function with a first sensitivity by means of at least one measurement result determined based on the at least one self-mixing interference measurement, the laser sensor module being further adapted to determine a second particle size distribution function with the second sensitivity, the second sensitivity being different from the first sensitivity, &#x2014;the at least one evaluator () being adapted to determine a particle measure of the particle size of 300 nm or less by subtracting the second particle size distribution function multiplied with a calibration factor q from the first particle size distribution function. The invention further describes a corresponding method and computer program product. The invention enables a simple and low-cost particle detection module or particle detector based on laser self-mixing interference which can detect particles with a size of 100 nm or even less.

Laser sensor for ultra-fine particle size detection

A laser sensor module for detecting a particle density of particles, which includes: a laser; a detector; and a mirror. The laser is arranged to emit a laser beam to the mirror. A movement of the mirror is arranged to redirect the laser beam. The laser beam is displaced with respect to a rotation axis of the mirror such that a focus region of the laser beam is moving with a velocity having components normal and parallel to the optical axis of the redirected laser beam such that an angle between the parallel and the normal velocity component is at least a threshold angle of 2&#xb0;. The detector is arranged to determine a self mixing interference signal of an optical wave within a laser cavity of the laser, the self mixing interference signal being generated by laser light of the laser beam reflected by at least one of the particles.

Laser sensor module for particle detection with offset beam

The invention describes a laser sensor module. The laser sensor module comprises at least a first laser () being adapted to emit a first measurement beam (') and at least a second laser () being adapted to emit a second measurement beam (&#x2032;). The laser sensor module further comprises an optical device () being arranged to redirect the first measurement beam (&#x2032;) and the second measurement beam (&#x2032;) such that the first measurement beam (&#x2032;) and the second measurement beam enclose an angle between 45&#xb0; and 135&#xb0;. The laser sensor module comprises one detector () being adapted to determine at least a first self-mixing interference signal of a first optical wave within a first laser cavity of the first laser () and at least a second self-mixing interference signal of a second optical wave within a second laser cavity of the second laser (). This configuration enables determination of an average velocity of the particles despite of the fact that it is not possible to determine the components of the velocity vector. The introduced error by means of statistical variations is acceptable because the number of detected particles scales with the cubic root of the particle velocity. The invention further describes a particle sensor () comprising such a laser sensor module, a corresponding method and computer program product. The invention enables a simple and low-cost particle sensor () for detecting small particles based on laser self-mixing interference.

Optical particle sensor

An optical particle sensor device comprises an optical emitter device for emitting a multitude of measurement laser beams; a detector device for detecting the measurement laser beams scattered on particles in the vicinity of the optical particle sensor device and for generating a single measuring signal assigned to this for each measurement laser beam; and an evaluation device for determining at least one estimated particle value for the number of particles per volume using at least one single measurement signal, wherein the evaluation device determines at least two estimated particle values for the number of particles per volume, which are based on at least partially different single measurement signals and/or a different number of single measurement signals, and on the basis of at least part of the estimated particle values, determines at least one output value for the particle load.

Optical particle sensor device and method for operating an optical particle sensor device

The invention describes a laser sensor module () for particle density detection. The laser sensor module () comprising at least one first laser (), at least one first detector () and at least one electrical driver (). The first laser () is adapted to emit first laser light in reaction to signals provided by the at least one electrical driver (). The at least one first detector () is adapted to detect a first self-mixing interference signal of an optical wave within a first laser cavity of the first laser (). The first self-mixing interference signal is caused by first reflected laser light reentering the first laser cavity, the first reflected laser light being reflected by a particle receiving at least a part of the first laser light. The laser sensor module () is adapted to reduce multiple counts of the particle. The invention further describes a related method and computer program product.

Laser sensor for particle density detection

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Vento, Netherlands

Alexander Marc Van Der Lee