WO2008034950A1 - Universal optical measuring device - Google Patents

Universal optical measuring device Download PDF

Info

Publication number
WO2008034950A1
WO2008034950A1 PCT/FI2007/050499 FI2007050499W WO2008034950A1 WO 2008034950 A1 WO2008034950 A1 WO 2008034950A1 FI 2007050499 W FI2007050499 W FI 2007050499W WO 2008034950 A1 WO2008034950 A1 WO 2008034950A1
Authority
WO
WIPO (PCT)
Prior art keywords
sphere
light
tube
shade
sample
Prior art date
Application number
PCT/FI2007/050499
Other languages
French (fr)
Inventor
Kari Fokin
Matti Raeske
Original Assignee
Standard Measuring Devices Oy
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
Priority claimed from FI20060835A external-priority patent/FI20060835A0/en
Application filed by Standard Measuring Devices Oy filed Critical Standard Measuring Devices Oy
Publication of WO2008034950A1 publication Critical patent/WO2008034950A1/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • G01N21/474—Details of optical heads therefor, e.g. using optical fibres
    • 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
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G01J1/04—Optical or mechanical part supplementary adjustable parts
    • 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
    • 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
    • G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
    • G01J3/0251—Colorimeters making use of an integrating sphere
    • 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
    • G01J3/0262—Constructional arrangements for removing stray light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/06—Illumination; Optics
    • G01N2201/063—Illuminating optical parts
    • G01N2201/0631—Homogeneising elements
    • G01N2201/0632—Homogeneising elements homogeneising by integrating sphere
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/06—Illumination; Optics
    • G01N2201/065—Integrating spheres

Definitions

  • the invention relates to a universal optical measuring device comprising an Ulbricht sphere that has a spherical, light-reflecting inner surface and an opening for viewing a sample to be examined; at least one semiconductor-type light source arranged into the sphere and illuminating the interior thereof; means for preventing the entry of direct rays of light from the light source into the viewing opening and to the sample to be examined and for equalizing the light received therein; at least one measuring tube installed in the sphere and directed towards the viewing opening for receiving light waves reflected from the sample to be examined; and means installed into the sphere for determining the light received from the light source and equalized or diffused by the inner surface of the sphere as a reference level for the light rays measured from the sample.
  • US patent publication 4,523,853 teaches a photometric reflection measurement device for medical purposes. It has LED illumination in an Ulbricht sphere.
  • the Ulbricht sphere acts as a dome equalizing or diffusing light. This device is primarily meant for measurement of lightness.
  • a sensor measuring light reflected from an object it contains a reference sensor at the other end of the measuring tube, the main function of the reference sensor being to determine light received from the light source and equalized by the diffusing dome, i.e. the Ulbricht sphere in this case, as reference light.
  • the reference sensor should measure uniform light contained in the dome at a point where the object to be measured and the illumination cause as little irregularity as possible in the light.
  • the aim is to carry out the measurement in the upper part of the sphere.
  • LED illumination is mounted between arms provided in the centre of the sphere.
  • a problem here is that the basic structure of the device, i.e. the LED illumination placed in the centre of the sphere at an angle of 90 degrees in relation to the measurement opening, large structures provided inside the sphere and the end of the measuring tube close to the measurement opening, prevents generating as uniform light as possible in the measurement opening and thereby in the object to be measured.
  • US patent publication 6,020,583 discloses LED illumination in another type of device than the Ulbricht sphere. The device is primarily meant for colour measurement.
  • this device has a reference sensor in the upper par thereof with which light received from a light source and equalized by a diffusing sphere is determined as a measuring reference.
  • a reference sensor in the upper par thereof with which light received from a light source and equalized by a diffusing sphere is determined as a measuring reference.
  • the LED illumination has been installed into the upper part of the sphere in such a way that light cannot enter directly into the measurement opening through the channels opening from the upper part.
  • the dome equalizing the light is not an Ulbricht sphere. Only the Ulbricht sphere is capable of producing light that is sufficiently uniform.
  • US patent publication 3,935,436 illustrates a colour measurement spectrophotometer having halogen illumination in an Ulbricht sphere.
  • a problem with this device is that it does not have a separate reference sensor determining a measuring reference from the light received from the light source and equalized by the diffusing sphere. Problems also arise from the use of an unstable halogen illumination.
  • a shield is installed in front of the light source.
  • the centre part of the device is provided with a tube with an expansion at the end thereof. Its role in restricting the entry of direct rays of light from the light source into the measurement opening and thereby to the object to be measured or on the whole to equalize the light entering the measurement opening has not been described in greater detail.
  • a measuring device of the invention characterized in that the means for preventing the entry of direct rays of light from the light source into the viewing opening and to the sample to be examined and for equalizing the light reaching them consist of at least one shade arranged to the measuring tube, the shade protruding from the measuring tube in the lateral direction thereof, and of a light source arranged to the upper part of the sphere, to the opposite side of the sphere in relation to viewing opening, and directed towards the lower part of the measuring tube and/or the upper surface of the shade; and in that the means for determining the reference level comprise at least one reference measurement tube directed to measure uniform light substantially from the middle of the inner surface of the sphere in relation to the upper and lower portions of the sphere.
  • the most significant advantage of the measuring device of the invention is that it is more stable than existing devices, i.e. measurement of colour or lightness can be reproduced at a significantly greater precision than before.
  • the reference level is measured with means designed particularly for this purpose at a location where the prevailing reference illumination circumstances remain as stable as possible. If the reference level measurement is not precise, not to mention if it is not carried out at all, reliable measurement of colour or lightness is extremely difficult, if not impossible. Another reason why it is important to provide light that is as uniform as possible is to avoid single irregularities of the object to be measured from distorting the measurement result, because this has a decisive effect on the reproducibility and precision of the measurement. Moreover, equalized light eliminates the effect of individual differences between light sources.
  • Figure 1 is a simplified cross-sectional view of a universal optical measuring device of the invention.
  • FIG. 2 is a block diagram of the processing of measurement results obtained with the measuring device of Figure 1.
  • Figure 1 shows a universal optical measuring device comprising an Ulbricht sphere 1 as its basic element, the sphere having a spherical light-reflecting inner surface 2 and an opening 3 for viewing a sample to be examined (not shown).
  • the sphere 1 On the opposite side with reference to the viewing opening 3, there is provided at least one semiconductor-type light source (LED or laser) 4 illuminating the interior of the sphere 1.
  • LED or laser semiconductor-type light source
  • a measuring tube 5 installed so that it is directed towards the viewing opening 3 for receiving light waves reflected by the sample to be examined.
  • the lower part of the measuring tube 5, preferably the very measuring end 8 thereof, is provided with a shade 6 protruding laterally therefrom for preventing the entry of direct rays of light from the light source 4 into the viewing opening 3 and to the sample to be examined.
  • the contours of the shade 6 preferably follow those of the viewing opening 3, and thus both may be circular in shape, for example.
  • the dimensioning of the shade 6 in turn depends on the position 1 of the shade and the end of the measuring tube 5 in the sphere in relation to the upper part and the viewing opening 3 of the sphere 1.
  • the lower surface of the shade 6 has an appropriately poor light reflectance; preferably it is matt black.
  • the light source 4 is directed towards the lower part of the measuring tube 5 and/or the upper surface of the shade 6 to prevent the light source 4 from having an effect on the sample to be examined.
  • the upper part of the sphere 1 is further provided with a fully separate and independent reference measurement tube 7 for determining the light received from the light source 4 and equalized or diffused by the inner surface 2 of the sphere 1 as the reference level for the rays of light measured from the object to be examined.
  • the reference measurement tube 7 is directed obliquely downwards to measure uniform light substantially from the middle of the inner surface 2 of the sphere 1 in relation to the lower and upper parts of the sphere 1.
  • the measuring head 9 of the reference tube 7 is located above the measuring head 8 of the measuring tube 5, the outer surface of the reference tube 7, the upper surface of the shade 6 and the outer surface of the measuring tube 5 all being coated, similarly as the inner surface 2 of the sphere 1 , with a substance having efficient light reflectivity.
  • the ends of the measuring tube 5 and the reference tube 7 extending outside the sphere 1 are provided with sensors 10 and 11 for detecting values to be measured and for transmitting signals for analysis.
  • the sensor 10 thus provides a value obtained of the object to be examined through the measuring tube 5 and the sensor 11 a reference value obtained of the reference surface, i.e. the inner surface 2 of the sphere, through the reference tube 7.
  • a measurement signal 12 based on the value obtained from the sensor 10 and a corresponding reference signal 13 based on the reference value obtained from the sensor 11 are transmitted to amplifiers 14 and 15, the amplified signals being then transmitted further to a processor 16 that executes the following process:
  • MIT the value obtained through the measuring tube 5 on the object to be examined
  • REF the reference value obtained through the reference tube 7 on the reference surface 2;
  • the result obtained from the processor 16 is processed in a controller unit 17 provided with the necessary peripherals 18 (display, computer interface, etc.)

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

A measuring device comprising: an Ulbricht sphere (1) that has a reflecting inner surface (2) and a sample opening (3); at least one semiconductor light source (4) arranged into the sphere (1); means (6) for preventing the entry of direct light from the source (4) into the opening (3) and to the sample and for equalizing the light received therein; at least one measuring tube (5) installed in the sphere (1) and directed towards the opening (3) for receiving reflected light from the sample; and means installed into the sphere (1 for determining the light received from the source (4) and equalized or diffused by the inner surface (2) as a reference level. The preventive means consist of at least one shade (6) arranged to the tube (5), the shade protruding from the tube (5) in the lateral direction thereof, and of the source (4) arranged to the upper sphere (1) part, to the opposite sphere (1) side in relation to the opening (3), and directed towards the lower part of the tube (5) and/or the upper shade (6) surface; and the reference level determining means comprise at least one reference measurement tube (7) directed to measure uniform light substantially from the middle of the inner surface (2) in relation to the upper and lower sphere (1) portions.

Description

UNIVERSAL OPTICAL MEASURING DEVICE
BACKGROUND OF THE INVENTION
[0001] The invention relates to a universal optical measuring device comprising an Ulbricht sphere that has a spherical, light-reflecting inner surface and an opening for viewing a sample to be examined; at least one semiconductor-type light source arranged into the sphere and illuminating the interior thereof; means for preventing the entry of direct rays of light from the light source into the viewing opening and to the sample to be examined and for equalizing the light received therein; at least one measuring tube installed in the sphere and directed towards the viewing opening for receiving light waves reflected from the sample to be examined; and means installed into the sphere for determining the light received from the light source and equalized or diffused by the inner surface of the sphere as a reference level for the light rays measured from the sample.
[0002] US patent publication 4,523,853 teaches a photometric reflection measurement device for medical purposes. It has LED illumination in an Ulbricht sphere. The Ulbricht sphere acts as a dome equalizing or diffusing light. This device is primarily meant for measurement of lightness. In addition to a sensor measuring light reflected from an object, it contains a reference sensor at the other end of the measuring tube, the main function of the reference sensor being to determine light received from the light source and equalized by the diffusing dome, i.e. the Ulbricht sphere in this case, as reference light. The reference sensor should measure uniform light contained in the dome at a point where the object to be measured and the illumination cause as little irregularity as possible in the light. The aim is to carry out the measurement in the upper part of the sphere. In an attempt to prevent the entry of direct rays of light from the source of light to the measurement opening and thereby to the object to be measured, LED illumination is mounted between arms provided in the centre of the sphere. A problem here is that the basic structure of the device, i.e. the LED illumination placed in the centre of the sphere at an angle of 90 degrees in relation to the measurement opening, large structures provided inside the sphere and the end of the measuring tube close to the measurement opening, prevents generating as uniform light as possible in the measurement opening and thereby in the object to be measured. [0003] US patent publication 6,020,583 discloses LED illumination in another type of device than the Ulbricht sphere. The device is primarily meant for colour measurement. Also this device has a reference sensor in the upper par thereof with which light received from a light source and equalized by a diffusing sphere is determined as a measuring reference. In an attempt to prevent the entry of direct rays of light from the light source to the measurement opening and thereby to the object to be measured the LED illumination has been installed into the upper part of the sphere in such a way that light cannot enter directly into the measurement opening through the channels opening from the upper part. A problem here is that the dome equalizing the light is not an Ulbricht sphere. Only the Ulbricht sphere is capable of producing light that is sufficiently uniform.
[0004] US patent publication 3,935,436 illustrates a colour measurement spectrophotometer having halogen illumination in an Ulbricht sphere. A problem with this device is that it does not have a separate reference sensor determining a measuring reference from the light received from the light source and equalized by the diffusing sphere. Problems also arise from the use of an unstable halogen illumination. In an attempt to prevent the entry of direct rays of light from the light source into the measurement opening and thereby to the object to be measured, a shield is installed in front of the light source. The centre part of the device is provided with a tube with an expansion at the end thereof. Its role in restricting the entry of direct rays of light from the light source into the measurement opening and thereby to the object to be measured or on the whole to equalize the light entering the measurement opening has not been described in greater detail.
SUMMARY OF THE INVENTION
[0005] It is an object of the invention to solve the problems described above. This is achieved by a measuring device of the invention, characterized in that the means for preventing the entry of direct rays of light from the light source into the viewing opening and to the sample to be examined and for equalizing the light reaching them consist of at least one shade arranged to the measuring tube, the shade protruding from the measuring tube in the lateral direction thereof, and of a light source arranged to the upper part of the sphere, to the opposite side of the sphere in relation to viewing opening, and directed towards the lower part of the measuring tube and/or the upper surface of the shade; and in that the means for determining the reference level comprise at least one reference measurement tube directed to measure uniform light substantially from the middle of the inner surface of the sphere in relation to the upper and lower portions of the sphere.
[0006] The most significant advantage of the measuring device of the invention is that it is more stable than existing devices, i.e. measurement of colour or lightness can be reproduced at a significantly greater precision than before. The reference level is measured with means designed particularly for this purpose at a location where the prevailing reference illumination circumstances remain as stable as possible. If the reference level measurement is not precise, not to mention if it is not carried out at all, reliable measurement of colour or lightness is extremely difficult, if not impossible. Another reason why it is important to provide light that is as uniform as possible is to avoid single irregularities of the object to be measured from distorting the measurement result, because this has a decisive effect on the reproducibility and precision of the measurement. Moreover, equalized light eliminates the effect of individual differences between light sources.
LIST OF FIGURES
[0007] In the following the invention will be disclosed in greater detail with reference to a preferred embodiment and to the accompanying drawing, in which
Figure 1 is a simplified cross-sectional view of a universal optical measuring device of the invention; and
Figure 2 is a block diagram of the processing of measurement results obtained with the measuring device of Figure 1.
DETAILED DISCLOSURE OF THE INVENTION
[0008] Figure 1 shows a universal optical measuring device comprising an Ulbricht sphere 1 as its basic element, the sphere having a spherical light-reflecting inner surface 2 and an opening 3 for viewing a sample to be examined (not shown).
[0009] In the upper part of the sphere 1 , on the opposite side with reference to the viewing opening 3, there is provided at least one semiconductor-type light source (LED or laser) 4 illuminating the interior of the sphere 1. [0010] On exactly the opposite side of the sphere in relation to the viewing opening 3 there is a measuring tube 5 installed so that it is directed towards the viewing opening 3 for receiving light waves reflected by the sample to be examined.
[0011] Further, the lower part of the measuring tube 5, preferably the very measuring end 8 thereof, is provided with a shade 6 protruding laterally therefrom for preventing the entry of direct rays of light from the light source 4 into the viewing opening 3 and to the sample to be examined. The contours of the shade 6 preferably follow those of the viewing opening 3, and thus both may be circular in shape, for example. The dimensioning of the shade 6 in turn depends on the position 1 of the shade and the end of the measuring tube 5 in the sphere in relation to the upper part and the viewing opening 3 of the sphere 1. The lower surface of the shade 6 has an appropriately poor light reflectance; preferably it is matt black.
[0012] With the above arrangement the light source 4 is directed towards the lower part of the measuring tube 5 and/or the upper surface of the shade 6 to prevent the light source 4 from having an effect on the sample to be examined.
[0013] The upper part of the sphere 1 is further provided with a fully separate and independent reference measurement tube 7 for determining the light received from the light source 4 and equalized or diffused by the inner surface 2 of the sphere 1 as the reference level for the rays of light measured from the object to be examined. The reference measurement tube 7 is directed obliquely downwards to measure uniform light substantially from the middle of the inner surface 2 of the sphere 1 in relation to the lower and upper parts of the sphere 1.
[0014] The measuring head 9 of the reference tube 7 is located above the measuring head 8 of the measuring tube 5, the outer surface of the reference tube 7, the upper surface of the shade 6 and the outer surface of the measuring tube 5 all being coated, similarly as the inner surface 2 of the sphere 1 , with a substance having efficient light reflectivity.
[0015] The ends of the measuring tube 5 and the reference tube 7 extending outside the sphere 1 are provided with sensors 10 and 11 for detecting values to be measured and for transmitting signals for analysis. The sensor 10 thus provides a value obtained of the object to be examined through the measuring tube 5 and the sensor 11 a reference value obtained of the reference surface, i.e. the inner surface 2 of the sphere, through the reference tube 7.
[0016] As shown in Figure 2, a measurement signal 12 based on the value obtained from the sensor 10 and a corresponding reference signal 13 based on the reference value obtained from the sensor 11 are transmitted to amplifiers 14 and 15, the amplified signals being then transmitted further to a processor 16 that executes the following process:
MIT/REF*X, where
MIT = the value obtained through the measuring tube 5 on the object to be examined;
REF = the reference value obtained through the reference tube 7 on the reference surface 2; and
X = an arbitrary constant.
[0017] The result obtained from the processor 16 is processed in a controller unit 17 provided with the necessary peripherals 18 (display, computer interface, etc.)
[0018] The above specification of the invention is only intended to illustrate the invention. A person skilled in the art is, however, capable of implementing its details in various ways within the scope of the invention.

Claims

1. A universal optical measuring device comprising: an Ulbricht sphere (1) that has a spherical, light-reflecting inner surface (2) and an opening (3) for viewing a sample to be examined; at least one semiconductor-type light source (4) arranged into the sphere (1) and illuminating the interior thereof; means (6) for preventing the entry of direct rays of light from the light source (4) into the viewing opening (3) and to the sample to be examined and for equalizing the light received therein; at least one measuring tube (5) installed in the sphere (1) and directed towards the viewing opening (3) for receiving light waves reflected from the sample to be examined; and means (7) installed into the sphere (1) for determining the light received from the light source (4) and equalized or diffused by the inner surface (2) of the sphere as a reference level for the light rays measured from the sample, c h a r a c t e r i z e d in that the means for preventing the entry of direct rays of light from the light source (4) into the viewing opening (3) and to the sample to be examined and for equalizing the light reaching them consist of at least one shade (6) arranged to the measuring tube (5), the shade protruding from the measuring tube (5) in the lateral direction thereof, and of a light source (4) arranged to the upper part of the sphere (1), to the opposite side of the sphere (1) in relation to viewing opening (3), and directed towards the lower part of the measuring tube (5) and/or the upper surface of the shade (6); and in that the means for determining the reference level comprise at least one reference measurement tube (7) directed to measure uniform light substantially from the middle of the inner surface (2) of the sphere in relation to the upper and lower portions of the sphere (1).
2. A measuring device according to claim ^ c h a r a c t e r i z e d in that the shade (6) is arranged to the lower part of the measuring tube (5).
3. A universal optical measuring device according to claim 1 or 2, c h a r a c t e r i z e d in that the reference tube (7) is arranged to the upper part of the sphere (1) and directed obliquely downward.
4. A universal optical measuring device according to any one of the preceding claims, characterized in that lower surface of the shade (6) has poor light reflectance; preferably it is matt black.
5. A universal optical measuring device according to any one of the preceding claims, characterized in that the upper surface of the shade (6), the surface of the measuring tube (5) and the surface of the reference tube (7) are coated, similarly as the inner surface (2) of the sphere, with a substance that reflects light efficiently.
PCT/FI2007/050499 2006-09-20 2007-09-19 Universal optical measuring device WO2008034950A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FI20060835 2006-09-20
FI20060835A FI20060835A0 (en) 2006-09-20 2006-09-20 Color / whiteness meter
FI20075173 2007-03-12
FI20075173A FI20075173A0 (en) 2006-09-20 2007-03-12 General optical measuring device

Publications (1)

Publication Number Publication Date
WO2008034950A1 true WO2008034950A1 (en) 2008-03-27

Family

ID=37930084

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2007/050499 WO2008034950A1 (en) 2006-09-20 2007-09-19 Universal optical measuring device

Country Status (2)

Country Link
FI (1) FI20075173A0 (en)
WO (1) WO2008034950A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2811272A1 (en) * 2013-06-07 2014-12-10 Honda Motor Co., Ltd. Integrating sphere

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4553848A (en) * 1981-09-30 1985-11-19 Boehringer Mannheim Gmbh Method of detecting and evaluating photometric signals and device for carrying out the method
US4995727A (en) * 1987-05-22 1991-02-26 Minolta Camera Kabushiki Kaisha Compact diffusion light mixing box and colorimeter
US5164586A (en) * 1990-05-23 1992-11-17 Carl-Zeiss-Stiftung Arrangement for measuring the absorption of transparent specimens mounted within an integrating sphere
FR2708735A1 (en) * 1993-07-29 1995-02-10 Routier Jean Denis Leon Device making it possible to evaluate the effects of light on the skin and its application to detection of pathologies of the skin
US5754283A (en) * 1994-10-26 1998-05-19 Byk-Gardner Usa, Division Of Atlana Color measuring device having interchangeable optical geometries
US20020001078A1 (en) * 2000-03-02 2002-01-03 Juergen Gobel Optical measuring arrangement, in particular for quality control in continuous processes
US20050229698A1 (en) * 2004-04-12 2005-10-20 Beecroft Michael T Hand-held spectrometer

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4553848A (en) * 1981-09-30 1985-11-19 Boehringer Mannheim Gmbh Method of detecting and evaluating photometric signals and device for carrying out the method
US4995727A (en) * 1987-05-22 1991-02-26 Minolta Camera Kabushiki Kaisha Compact diffusion light mixing box and colorimeter
US5164586A (en) * 1990-05-23 1992-11-17 Carl-Zeiss-Stiftung Arrangement for measuring the absorption of transparent specimens mounted within an integrating sphere
FR2708735A1 (en) * 1993-07-29 1995-02-10 Routier Jean Denis Leon Device making it possible to evaluate the effects of light on the skin and its application to detection of pathologies of the skin
US5754283A (en) * 1994-10-26 1998-05-19 Byk-Gardner Usa, Division Of Atlana Color measuring device having interchangeable optical geometries
US20020001078A1 (en) * 2000-03-02 2002-01-03 Juergen Gobel Optical measuring arrangement, in particular for quality control in continuous processes
US20050229698A1 (en) * 2004-04-12 2005-10-20 Beecroft Michael T Hand-held spectrometer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2811272A1 (en) * 2013-06-07 2014-12-10 Honda Motor Co., Ltd. Integrating sphere

Also Published As

Publication number Publication date
FI20075173A0 (en) 2007-03-12

Similar Documents

Publication Publication Date Title
US5637873A (en) Directional reflectometer for measuring optical bidirectional reflectance
US5369481A (en) Portable spectrophotometer
JP4065597B2 (en) Photometric diagnostic meter read head
US8970830B2 (en) Measuring method and device for determining transmission and/or reflection properties
JP4128978B2 (en) Apparatus and method for identifying surface properties
US6982794B1 (en) Directional reflectometer
US8072607B2 (en) Measuring device for measuring optical properties of transparent substrates
JP2003513236A (en) Built-in optical probe for spectroscopic analysis
CN107795960B (en) Measuring light source and measuring system for detecting reflection spectrum
US20120026512A1 (en) Apparatus and method for determining surface characteristics using multiple measurements
US4900923A (en) Reflectance measuring apparatus including a cylinder-shaped light conducting device between the measuring aperture and the specimen
US8422007B2 (en) Optical measurement device with reduced contact area
US20120314219A1 (en) Device for referenced measurements of reflected light and a method for calibrating such a device
JPH09288007A (en) Spectral colorimeter
WO2008034950A1 (en) Universal optical measuring device
JP5149880B2 (en) Determination of surface properties using angular offset correction.
JP2001041882A (en) Egg testing apparatus
JP2001013065A (en) Egg inspection apparatus
JP2009222614A (en) Surface inspection apparatus
JP6924561B2 (en) Reference white plate unit for near-infrared interaction spectroscopy measurement and reference spectral intensity acquisition method for near-infrared interaction spectroscopy
CN221302708U (en) Reflectivity measurement system of optical device
CN217931345U (en) Laser methane gas sensor
CN218180670U (en) Regular reflectance testing device for large-scale plate
WO2021040247A1 (en) Gas sensing system using scattered light measurement
JPH06201581A (en) Simultaneous measuring apparatus of reflected/ transmitted light

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07823136

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC, OUR COMMUNICATION (EPO FORM 1205A) OF 02.07.09

122 Ep: pct application non-entry in european phase

Ref document number: 07823136

Country of ref document: EP

Kind code of ref document: A1