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WO2018177565A1 - Dispositif d'imagerie sans chatoiement sous éclairage laser - Google Patents

Dispositif d'imagerie sans chatoiement sous éclairage laser Download PDF

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Publication number
WO2018177565A1
WO2018177565A1 PCT/EP2017/063565 EP2017063565W WO2018177565A1 WO 2018177565 A1 WO2018177565 A1 WO 2018177565A1 EP 2017063565 W EP2017063565 W EP 2017063565W WO 2018177565 A1 WO2018177565 A1 WO 2018177565A1
Authority
WO
WIPO (PCT)
Prior art keywords
reflector
vibrating element
laser
light scattering
speckle
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/EP2017/063565
Other languages
English (en)
Inventor
Uldis Rubins
Edgars KVIESIS-KIPGE
Janis Spigulis
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.)
Institute of Solid State Physics University of Latvia
Original Assignee
Institute of Solid State Physics University of Latvia
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 Institute of Solid State Physics University of Latvia filed Critical Institute of Solid State Physics University of Latvia
Publication of WO2018177565A1 publication Critical patent/WO2018177565A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/48—Laser speckle optics
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/10—Arrangements of light sources specially adapted for spectrometry or colorimetry
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B21/00—Microscopes
    • G02B21/06—Means for illuminating specimens
    • G02B21/08—Condensers
    • G02B21/082—Condensers for incident illumination only
    • G02B21/084—Condensers for incident illumination only having annular illumination around the objective

Definitions

  • the present invention relates to imaging technologies, in particular - to speckle-free imaging of object's surface illuminated by scattered light of a number of lasers.
  • Scattered laser illumination has been used in many technical fields, such as monochrome spectral imaging (WO 2013135311 Al, 2012) which can be used for calculation of skin or other objects' absorbing chromophore distribution maps (D.Jakovels and J.Spigulis, J. Biophoton., 3(3), 125-129, 2010; ./. Spigulis et al., Proc. SPIE, Vol. 7557, 75570M, 2010; J.Spigulis et al., Proc. SPIE, v.8216, 82160L, 2012).
  • the laser beam scattering is required to ensure uniform illumination of object's surface.
  • beam diffusers placed in the spotlighting are used, which slightly modifies and “mixes” directions of radiation (J.Spigulis and I.Oshina, J.Biomed.Opt., 20(5), 050503, 2015), or diffusive reflectors of specific design (WO 2017/012675 Al, 2015).
  • J.Spigulis and I.Oshina, J.Biomed.Opt., 20(5), 050503, 2015 diffusive reflectors of specific design
  • WO 2017/012675 Al WO 2017/012675 Al, 2015.
  • speckle Formation of speckle is determined by laser radiation ' s spectral width, angle of incidence, polarization and wavelength (http://www.siliconlight.com/wp-content/themes/siliconlight/pdf/speckle-spie.pdf).
  • the methods of productive use of laser speckle are known, such as subcutaneous blood flow imaging (D.Jakovels, I.Saknite and J.Spigulis, Proc. SPIE, 9129, 912931, 2014).
  • laser speckles create negative effects to be avoided or reduced - for instance, their negative effect in laser projectors is reduced by using mutually incoherent (randomized) lasers for projection
  • the goal of the invention is to ensure speckle-free digital imaging in lighting, which is homogenized by using reflective laser beam scatterers.
  • the device comprising a digital image sensor having an objective lens adapted for object imaging, a laser irradiation unit, a reflector having a light scattering coating, a mechanically vibrating element, and an oscillation generator.
  • the reflector having a light scattering coating is fixed to the mechanically vibrating element and the overall oscillation frequency / satisfies the condition t >5, where t is exposure time of the digital imaging.
  • acoustic speaker moving part(s) can be used as mechanically vibrating element in the device.
  • the reflector having a light scattering coating in the device may be ring-shaped, with a protective barrier to avoid illumination of the image sensor by laser radiation, and positioned so that the image sensor with lens is located inside the said ring.
  • Fig. 1 shows a block diagram of the proposed device
  • Fig. 3 illustrates a possible spatial solution of the device.
  • the proposed device (Fig. 1) comprises a digital image sensor 2 having an objective lens adapted for object 1 imaging, a laser irradiation unit 3, a reflector 4 having a light scattering coating 5, a mechanically vibrating element 6, and the oscillation generator 7.
  • laser radiation reflected from the reflector 4 and scattered by its coating 5 is used; the radiation is emitted from the laser irradiation unit 3.
  • a number of accordingly aligned lasers and their powering devices are placed in said unit that provide the laser operation and their switching-on and/or switching- off.
  • the laser beams through the light scattering coating 5 are directed to the reflector 4, which is connected to the mechanically vibrating element 6, such as an acoustic speaker's moving surface.
  • Oscillator 7 provides an adjustable oscillation frequency f, which is selected to satisfy the condition tf ' >5, where t - exposure time of the image sensor 2, so providing at least five oscillations of the scattering reflector during a single exposure.
  • a geometric location of the reflector-diffuser 4,5 relative to the image sensor 2 can be varied, and its shape may vary as well.
  • a ring shape proved to be the optimal, covering the image sensor and thus ensuring the most even illumination of the object meeting the condition that the used lasers symmetrically irradiate the reflector' s-diffuser's surface.
  • Such a spatial solution of the device is illustrated in Fig. 3.
  • the ring oscillations can be provided by two or more mutually synchronized vibrating elements such as loudspeakers placed at the opposite parts of the ring, ensuring that the loudspeakers' moving parts are in mechanical contact with this ring.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Radiation-Therapy Devices (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

La présente invention concerne l'imagerie d'une surface d'un objet éclairée par une lumière laser diffusée. L'objectif de l'invention est de fournir des images numériques sans chatoiement avec un éclairage qui est homogénéisé au moyen d'un diffuseur réfléchissant de faisceaux laser. Pour atteindre l'objectif, un dispositif comprenant un capteur d'image numérique (2) comportant une lentille d'objectif, une unité d'irradiation laser (3), un réflecteur (4) possédant un revêtement de diffusion de lumière, un élément à vibration mécanique (6) et un générateur (7) de vibrations est proposé. Le réflecteur possédant un revêtement de diffusion de lumière est fixé à l'élément à vibration mécanique; la fréquence de vibration f est sélectionnée pour satisfaire la condition f t>5, t étant un temps d'exposition de l'imagerie numérique. La partie mobile d'un haut-parleur acoustique peut être utilisée comme élément à vibration mécanique. Le réflecteur possédant un revêtement de diffusion de lumière peut être en forme d'anneau, de façon que le capteur d'image comportant une lentille d'objectif soit situé à l'intérieur de l'anneau de réflexion-diffusion.
PCT/EP2017/063565 2017-03-28 2017-06-02 Dispositif d'imagerie sans chatoiement sous éclairage laser Ceased WO2018177565A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LVP-17-17A LV15370B (lv) 2017-03-28 2017-03-28 Ierīce no spekliem brīvu attēlu iegūšanai izkliedētu lāzeru staru apgaismojumā
LVP-17-17 2017-03-28

Publications (1)

Publication Number Publication Date
WO2018177565A1 true WO2018177565A1 (fr) 2018-10-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2017/063565 Ceased WO2018177565A1 (fr) 2017-03-28 2017-06-02 Dispositif d'imagerie sans chatoiement sous éclairage laser

Country Status (2)

Country Link
LV (1) LV15370B (fr)
WO (1) WO2018177565A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070274075A1 (en) * 2006-01-31 2007-11-29 National Institute Of Advanced Industrial Science And Technology Laser illuminator
WO2013135311A1 (fr) 2012-03-13 2013-09-19 Latvijas Universitate Procédé et dispositif permettant de former des images de la réflectance spectrale à plusieurs bandes de longueurs d'onde
WO2017012675A1 (fr) 2015-07-23 2017-01-26 Latvijas Universitate Procédé et dispositif permettant une cartographie des composés tissulaires au moyen d'un téléphone intelligent

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070274075A1 (en) * 2006-01-31 2007-11-29 National Institute Of Advanced Industrial Science And Technology Laser illuminator
WO2013135311A1 (fr) 2012-03-13 2013-09-19 Latvijas Universitate Procédé et dispositif permettant de former des images de la réflectance spectrale à plusieurs bandes de longueurs d'onde
WO2017012675A1 (fr) 2015-07-23 2017-01-26 Latvijas Universitate Procédé et dispositif permettant une cartographie des composés tissulaires au moyen d'un téléphone intelligent

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
D.JAKOVELS; I.SAKNITE; J.SPIGULIS, PROC.SPIE, vol. 9129, 2014, pages 912931
D.JAKOVELS; J.SPIGULIS, J. BIOPHOTON., vol. 3, no. 3, 2010, pages 125 - 129
J. SPIGULIS ET AL., PROC. SPIE, vol. 7557, 2010, pages 75570M
J.SPIGULIS ET AL., PROC. SPIE, vol. 8216, 2012, pages 82160L
J.SPIGULIS; I.OSHINA, J.BIOMED.OPT., vol. 20, no. 5, 2015, pages 050503

Also Published As

Publication number Publication date
LV15370A (lv) 2018-10-20
LV15370B (lv) 2019-07-20

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