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WO2008043383A1 - Ensemble d'enregistrement d'images de particules utilisé pour une reconnaissance automatique - Google Patents

Ensemble d'enregistrement d'images de particules utilisé pour une reconnaissance automatique Download PDF

Info

Publication number
WO2008043383A1
WO2008043383A1 PCT/EP2006/009880 EP2006009880W WO2008043383A1 WO 2008043383 A1 WO2008043383 A1 WO 2008043383A1 EP 2006009880 W EP2006009880 W EP 2006009880W WO 2008043383 A1 WO2008043383 A1 WO 2008043383A1
Authority
WO
WIPO (PCT)
Prior art keywords
led
particles
camera
arrangement
arrangement according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2006/009880
Other languages
German (de)
English (en)
Inventor
Kurt Dirk Bettenhausen
Tarik Krami
Hubert Müller
Herbert Schorb
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to PCT/EP2006/009880 priority Critical patent/WO2008043383A1/fr
Publication of WO2008043383A1 publication Critical patent/WO2008043383A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N15/1425—Optical investigation techniques, e.g. flow cytometry using an analyser being characterised by its control arrangement
    • G01N15/1427—Optical investigation techniques, e.g. flow cytometry using an analyser being characterised by its control arrangement with the synchronisation of components, a time gate for operation of components, or suppression of particle coincidences
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N15/1429—Signal processing
    • G01N15/1433—Signal processing using image recognition
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N15/1456—Optical investigation techniques, e.g. flow cytometry without spatial resolution of the texture or inner structure of the particle, e.g. processing of pulse signals
    • G01N15/1459—Optical investigation techniques, e.g. flow cytometry without spatial resolution of the texture or inner structure of the particle, e.g. processing of pulse signals the analysis being performed on a sample stream
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/02—Investigating particle size or size distribution
    • G01N15/0205—Investigating particle size or size distribution by optical means
    • G01N2015/025—Methods for single or grouped particles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N15/1434—Optical arrangements
    • G01N2015/1438—Using two lasers in succession
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N15/1434—Optical arrangements
    • G01N2015/144—Imaging characterised by its optical setup
    • G01N2015/1445—Three-dimensional imaging, imaging in different image planes, e.g. under different angles or at different depths, e.g. by a relative motion of sample and detector, for instance by tomography
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N2015/1497—Particle shape

Definitions

  • the invention relates to an arrangement for image recording of particles according to the preamble of claim 1, comprising a camera for receiving the particles and a lighting device for illuminating the particles.
  • an arrangement for imaging of particles with a camera for receiving the particles and a lighting device for illuminating the particles is characterized in that the lighting device is designed as a light-emitting diode (LED).
  • LED light-emitting diode
  • the lighting device is designed as a light-emitting diode, the cost of controlling the light source is reduced considerably. To operate the LED only one power source is required, which emits correspondingly short current pulses with sufficiently large amplitude. The required for operating a laser typical circuit complexity is completely eliminated. This has a significant impact on costs.
  • a control for operating the LED by means of which a current pulse is applied to the LED for emitting a light flash which is approximately 5 to 20 times, preferably 7.5 to 15 times, in particular 10 times the permissible continuous operating current and its Pulse width about 0.5 microseconds to 2 microseconds, preferably 0.75 microseconds to 1.5 microseconds, in particular 1 microsecond at a duty cycle of about 1: 50,000 to 1: 200,000, in particular 1: 66,000 to 1: 133,000, preferably 1: 100,000 is.
  • a locally very bright flash of light is generated in a simple manner, which has the light energy required for image control despite its short pulse duration. Due to the extreme duty cycle, commercially available LEDs can be operated heavily overdriven without being damaged. Due to the brevity of the extreme duty cycle
  • Lightning is on the one hand ensures that the LED is not thermally overloaded, and on the other hand, that at high speed moving particles are sharply displayed.
  • the multiple exposure technique can also be used to advantage for the shape and size measurement of the particles themselves. Since a two-dimensional shadow of the real three-dimensional shape of a particle is displayed in a flash of light, at least two shadows can be produced by multiple exposure. The shadow throws can be used for more objective assessment of particle size values in image processing due to random particle rotation.
  • the arrangement according to the invention is suitable for particle measurement in both gaseous and liquid medium.
  • an LED is used which has a highly concentrated emission characteristic.
  • the viewing angle should be ⁇ 18 degrees, preferably ⁇ 12 degrees, in particular 6 degrees.
  • When using such an LED can be dispensed with a further optics for shaping the light field. This also has a very beneficial effect on the costs.
  • a single LED without additional optics is sufficient for shaping the light.
  • particles with a size distribution between 5 and 100 microns can be easily reproduced.
  • the LED is arranged behind the measuring region from the perspective of the camera and represents a backlight (also called transmitted-light or shadow-light illumination) without intermediate optics. It should be ensured here that the illuminated area imaged in the measuring region completely illuminates the image of the camera. The complete illumination can be achieved for example by means of a zoom of the lens of the camera.
  • the camera is set such that an overdrive (White saturation) of the camera image over the entire illuminated area is present, with the override may be locally up to 50%.
  • the override can be easily achieved by adjusting the illumination intensity and camera sensitivity in the composite.
  • the above-mentioned measures advantageously achieve that the measuring region can be enlarged by arranging several LEDs close to one another; Because the brightness fluctuations inevitably present at the LED borders become largely meaningless due to the blurred and overdriven image of the illuminated area. It is particularly advantageous for the arrangement of several LEDs close together, if the LEDs have a rectangular shape.
  • the measuring region or the measuring volume is located exactly in the focal plane of the lens of the camera. Particles in this plane appear as high-contrast shadows in the camera image. Particles that lie in front of or behind the focal plane, but still in the depth of field, show a slight but unproblematic loss of contrast at the edges.
  • Fig. 1 is a schematic representation of a first arrangement according to the invention with a light emitting diode and
  • Fig. 2 is a schematic representation of a second inventive arrangement with two LEDs.
  • an arrangement for imaging of particles 3 has a camera 1 and an illumination device formed by an LED 2.
  • the particles 3 are in an air flow or liquid flow and are moved through a pipe 9 in a direction represented by an arrow 3a.
  • the image pickup device comprises a megapixel camera 1 with an image sensor element 7 and a lens.
  • the image sensor element 7 of the camera 1 is preferably of the CCD type and provided with an electronic shutter.
  • the pixel resolution is at least 1000 by 1000 pixels.
  • the optical system consists of a zoom lens with a light inlet 5, behind which is a lens set 6a, 6b shown here only schematically.
  • the lens set 6a, 6b is arranged so that the focus of the arrangement is approximately located on the center axis of the tube 9. Accordingly, a measuring volume 3b, which is imaged sharply on the image sensor 7, lies on the center axis of the tube 9.
  • the LED 2 which can be a modern super-bright LED from the Sun Power series from Agilent Technologies, has a viewing angle 8 of six degrees. To operate the LED 2, which is designed for a maximum continuous operating current of fifty milli-ampere, this is connected to a controller 4.
  • the controller 4 provides current pulses having an amplitude of five hundred milliamps and a pulse width of one microsecond at a duty cycle of 1: 100,000. It takes 10 pictures per second.
  • the sensitivity of the camera 1 is set so that in a flash of light, the image sensor 7 is overridden over its entire surface by up to fifty percent, d. H. a white saturation is present.
  • Fig. 2 corresponds substantially to the arrangement shown in Fig. 1.
  • the same elements are therefore provided with the same reference numerals.
  • the arrangement shown in FIG. 2 has two LEDs 2 a, 2 b, which are rectangular in shape and tightly packed, ie. H. close together, are arranged. This increases the measurement volume 3b.
  • the lenses 6a, 6b of the camera 1 are arranged at a different distance from one another.
  • the arrangement or configuration of the optical objective is selected such that the enlarged measurement volume 3b completely fills the image sensor 7.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Studio Devices (AREA)

Abstract

L'invention concerne un ensemble d'enregistrement d'images de particules (3) comprenant une caméra destinée à enregistrer des images de particules (3) et un dispositif d'éclairage (2, 2a, 2b) destiné à éclairer les particules. L'invention est caractérisée en ce que le dispositif d'éclairage (2; 2a, 2b) se présente sous la forme d'une diode électroluminescente (DEL).
PCT/EP2006/009880 2006-10-12 2006-10-12 Ensemble d'enregistrement d'images de particules utilisé pour une reconnaissance automatique Ceased WO2008043383A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2006/009880 WO2008043383A1 (fr) 2006-10-12 2006-10-12 Ensemble d'enregistrement d'images de particules utilisé pour une reconnaissance automatique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2006/009880 WO2008043383A1 (fr) 2006-10-12 2006-10-12 Ensemble d'enregistrement d'images de particules utilisé pour une reconnaissance automatique

Publications (1)

Publication Number Publication Date
WO2008043383A1 true WO2008043383A1 (fr) 2008-04-17

Family

ID=38197978

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/009880 Ceased WO2008043383A1 (fr) 2006-10-12 2006-10-12 Ensemble d'enregistrement d'images de particules utilisé pour une reconnaissance automatique

Country Status (1)

Country Link
WO (1) WO2008043383A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018213601B3 (de) 2018-08-13 2019-09-05 Eidecon Vision Solutions Gmbh Abbildungsvorrichtung mit passivem Durchlicht
CN110940618A (zh) * 2019-12-10 2020-03-31 西安交通大学 基于固液两相流体耦合起电的在线磨粒监测系统及方法
US20240202922A1 (en) * 2021-04-15 2024-06-20 Cropsy Technologies Limited Plant management system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0424176A2 (fr) * 1989-10-20 1991-04-24 Minnesota Mining And Manufacturing Company Commande d'émission d'énergie d'exposition
US5633503A (en) * 1993-11-26 1997-05-27 Toa Medical Electronics Co., Ltd. Particle analyzer
EP0950890A2 (fr) * 1998-04-13 1999-10-20 Sysmex Corporation Dispositif d'image de particules
US6115119A (en) * 1997-10-21 2000-09-05 Bigelow Laboratory For Ocean Science Device and method for studying particles in a fluid
WO2004104554A2 (fr) * 2003-05-20 2004-12-02 Technology Innovations, Llc Module d'analyse organique
US20050030519A1 (en) * 2003-08-05 2005-02-10 Roth Wayne D. Light emitting diode based measurement systems

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0424176A2 (fr) * 1989-10-20 1991-04-24 Minnesota Mining And Manufacturing Company Commande d'émission d'énergie d'exposition
US5633503A (en) * 1993-11-26 1997-05-27 Toa Medical Electronics Co., Ltd. Particle analyzer
US6115119A (en) * 1997-10-21 2000-09-05 Bigelow Laboratory For Ocean Science Device and method for studying particles in a fluid
EP0950890A2 (fr) * 1998-04-13 1999-10-20 Sysmex Corporation Dispositif d'image de particules
WO2004104554A2 (fr) * 2003-05-20 2004-12-02 Technology Innovations, Llc Module d'analyse organique
US20050030519A1 (en) * 2003-08-05 2005-02-10 Roth Wayne D. Light emitting diode based measurement systems

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018213601B3 (de) 2018-08-13 2019-09-05 Eidecon Vision Solutions Gmbh Abbildungsvorrichtung mit passivem Durchlicht
CN110940618A (zh) * 2019-12-10 2020-03-31 西安交通大学 基于固液两相流体耦合起电的在线磨粒监测系统及方法
CN110940618B (zh) * 2019-12-10 2021-01-15 西安交通大学 基于固液两相流体耦合起电的在线磨粒监测系统及方法
US20240202922A1 (en) * 2021-04-15 2024-06-20 Cropsy Technologies Limited Plant management system

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