WO2010029390A1 - A spectrometric device - Google Patents

A spectrometric device Download PDF

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Publication number
WO2010029390A1
WO2010029390A1 PCT/IB2008/053727 IB2008053727W WO2010029390A1 WO 2010029390 A1 WO2010029390 A1 WO 2010029390A1 IB 2008053727 W IB2008053727 W IB 2008053727W WO 2010029390 A1 WO2010029390 A1 WO 2010029390A1
Authority
WO
WIPO (PCT)
Prior art keywords
opening
sample
spectrometric device
mirror
light
Prior art date
Application number
PCT/IB2008/053727
Other languages
French (fr)
Inventor
David Honigs
Original Assignee
Perten Instruments, Inc.
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 Perten Instruments, Inc. filed Critical Perten Instruments, Inc.
Priority to PCT/IB2008/053727 priority Critical patent/WO2010029390A1/en
Publication of WO2010029390A1 publication Critical patent/WO2010029390A1/en

Links

Classifications

    • 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
    • G01J3/0208—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using focussing or collimating elements, e.g. lenses or mirrors; performing aberration correction
    • 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
    • G01J3/021—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using plane or convex mirrors, parallel phase plates, or particular reflectors
    • 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
    • G01J3/0218—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using optical fibers
    • 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
    • G01J3/0297—Constructional arrangements for removing other types of optical noise or for performing calibration
    • 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
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • 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
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • 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
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/03—Cuvette constructions
    • G01N2021/0346—Capillary cells; Microcells
    • G01N2021/035—Supports for sample drops
    • 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
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
    • G01N2021/317—Special constructive features
    • 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
    • G01N2201/08—Optical fibres; light guides

Definitions

  • the present invention relates to a method of matching an illumination beam of a spectrometric device to the shape and size of a small sample, a spectrometric device for performing said method and a sample bed.
  • spectrometric devices For the analysis of crops, such as seeds and beans, spectrometric devices are used. Usually the samples to be analysed are rather large but sometimes it interesting to analyse single kernels. A problem that arise when small samples, such as single kernels, are to be analysed is that the illumination beam from the spectrometric device is larger than the sample causing reflected light from the sample bed outside of the small sample to be reflected to the detectors of the spectrometer which disturb the analysis and distort the light spectra.
  • the objective of the present invention is to solve this problem in an cost effective way and in such a manner that a spectrometric device can be changed from analysing large samples to analysing small samples in a very fast and simple manner.
  • This objective is accomplished by a method of matching an illumination beam of a spectrometric device to the shape and size of a small sample, characterised by the steps of placing the sample on a bed including a curved mirror having a curvature such that the incident light falling on the curved mirror from an opening in the spectrometric device is reflected back into said opening, and placing detectors connected to a spectrometer outside of light beams reflected from the mirror.
  • the curvature of the mirror is chosen so that its focus lies proximate to said opening in the spectrometric device.
  • the invention also relates to a spectrometric device including a light source emitting an illumination beam through an opening in the spectrometric device, a sample bed disposed beneath said opening, and light detectors connected to a spectrometer, characterised in that the sample bed includes a curved mirror having a curvature such that the incident light falling on the curved mirror from the opening in the housing of the spectrometric device is reflected back into said opening, and the detectors connected to the spectrometer are located outside of light beams reflected from the mirror.
  • the invention further relates to a sample bed for a spectrometric device, characterised in that it includes a curved mirror.
  • a spectrometric device 1 is schematically shown.
  • the device 1 includes, as a light source, a tungsten-halogen bulb 2, a parabolic mirror 3, a planar mirror 4, a housing H (only a portion thereof is shown in the figure) with an opening 5, a sample bed 6, and optical fibres 7 connected to a spectrometer 8.
  • seven optical fibres are used, of which only two are present in the figure, but fewer or more than seven optical fibres can be used.
  • Any type of spectrometer sorting the light into specific wavelengths and recording the spectrum can be used, such as a grating-based system or an interferometer-based system.
  • the light from the bulb 2 is collimated by a parabolic reflecting mirror 3, which emits an illumination beam IB, indicated by interrupted arrows 9, to the planar mirror 4.
  • This mirror is angled in such a way that the illumination beam IB is reflected so that the major part of this beam after reflection passes through the opening 5 in housing H as indicated by interrupted arrows 10.
  • the sample bed 6 is placed beneath the opening 5 so that a collimated illumination beam falls on the sample bed.
  • the sample bed 6 includes a curved mirror 11 on the upper side thereof. The curvature of mirror 11 is so chosen that all incident light from opening 5 is reflected back through the opening 5 and is lost within the housing H. This is ensured by placing the sample bed on such a distance beneath the opening 5 that the focus of the mirror 11 of the sample bed 6 is located in the proximity of the opening 5.
  • the reflected light from mirror 11 is indicated by interrupted arrows 12.
  • the optical fibres 7 are located outside of the opening 5 and is thereby outside the reach of light reflected from mirror 11 of the sample bed 6.
  • the optical fibres are directed towards the centre of the curved mirror 11. When no sample is placed on the sample bed no light will thus reach the optical fibres 7.
  • FIG 1 a small sample S is shown placed in the centre of mirror 11.
  • the incident beam indicated by interrupted arrows 10 has a much larger diameter than the perimeter of sample S which means that if the sample S had been placed on a planar sample bed a lot of light reflected from the area of the sample bed outside the perimeter of the sample S would have reached the optical fibres 7 and thereby the spectrometer 8. The spectral analysis would then have been disturbed and the light spectra would have been distorted.
  • Due to the curvature of mirror 11 all light reflected from the area outside of the perimeter of sample S will be reflected back into the opening without reaching the optical fibres 7.
  • the light hitting the sample S will scatter in all directions and some of the reflected light will reach the optical fibres 7, as indicated by arrows 13 in figure 1.
  • the light transferred by the optical fibres 7 to the spectrometer 8 will thus only be light reflected from sample S.
  • the present invention thus enables a spectrometric device used for analysing large samples to also analyse small samples just by substituting a planar sample bed with a sample bed according to the present invention and possibly adjusting the distance of the sample bed according to the present invention so that the focus of the curved mirror 11 will be located in the proximity of the light opening 5 in the housing H of the spectrometric device 1.
  • the matching of a spectrometric device from analyses of large sample to analysing a small sample is thus very simple, cost effective and fast.
  • the spectrometric device according to the present invention can be used for other types of small samples than single kernels or small samples of kernels, such as medical tablets. It can also be used for analysing drops or small samples of liquid, such as oils.
  • Figure 1 illustrates a device using broad band (white light) illumination and post dispersion of the light.
  • a pre-dispersive system in which the spectrometer is placed between the light source and the sample would function in the same way.
  • the optical fibres then take the light to a photometric detector or detectors.
  • the detectors can be located so that they can view the sample without aid of optical fibres.
  • the embodiment described can be modified in several respects without leaving the scope of invention.
  • Other suitable light sources than tungsten-bulbs can be used.
  • Other means for collimating the light from the light source than a parabolic mirror can be used, such as a lens or systems of lenses and mirrors.
  • the collimated illumination beam can be directed straight through the opening in the housing of the spectrometric device so that the angled planar mirror can be deleted. If several small samples are to be separately analysed, the sample bed can be a conveyer having a row of curved mirrors intermittently moved into place beneath the light opening in the spectrometric device.
  • the invention shall therefore only be limited by the content of the enclosed patent claims.

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)

Abstract

The present invention relates to a method of matching an illumination beam (IB) of a spectrometric device (1 ) to the shape and size of a small sample (S). The method includes the steps of placing the sample (S) on a curved mirror (11 ) having a curvature such that the incident light falling on the curved mirror from an opening (5) in the spectrometric device (1 ) is reflected back into said opening, and placing detectors (7) connected to a spectrometer outside of light beams reflected from the mirror (11 ). The invention also relates to a spectrometric device for performing the method and a sample.

Description

A spectrometric device.
TECHNICAL FIELD
The present invention relates to a method of matching an illumination beam of a spectrometric device to the shape and size of a small sample, a spectrometric device for performing said method and a sample bed.
BACKGROUND OF THE INVENTION
For the analysis of crops, such as seeds and beans, spectrometric devices are used. Usually the samples to be analysed are rather large but sometimes it interesting to analyse single kernels. A problem that arise when small samples, such as single kernels, are to be analysed is that the illumination beam from the spectrometric device is larger than the sample causing reflected light from the sample bed outside of the small sample to be reflected to the detectors of the spectrometer which disturb the analysis and distort the light spectra.
The objective of the present invention is to solve this problem in an cost effective way and in such a manner that a spectrometric device can be changed from analysing large samples to analysing small samples in a very fast and simple manner.
SUMMARY OF THE INVENTION
This objective is accomplished by a method of matching an illumination beam of a spectrometric device to the shape and size of a small sample, characterised by the steps of placing the sample on a bed including a curved mirror having a curvature such that the incident light falling on the curved mirror from an opening in the spectrometric device is reflected back into said opening, and placing detectors connected to a spectrometer outside of light beams reflected from the mirror. By such a method there is no need to change the size of the illumination beam when a small sample is to be analysed after a large sample, it is enough to perform the simple act of replacing the sample bed for the large sample by a sample bed including a curved mirror.
In a preferred embodiment, the curvature of the mirror is chosen so that its focus lies proximate to said opening in the spectrometric device.
The invention also relates to a spectrometric device including a light source emitting an illumination beam through an opening in the spectrometric device, a sample bed disposed beneath said opening, and light detectors connected to a spectrometer, characterised in that the sample bed includes a curved mirror having a curvature such that the incident light falling on the curved mirror from the opening in the housing of the spectrometric device is reflected back into said opening, and the detectors connected to the spectrometer are located outside of light beams reflected from the mirror.
In a preferred embodiment, the focus of curved the mirror lies proximate to said opening in the spectrometric device and the light detectors are preferably optical fibres connected to the spectrometer.
The invention further relates to a sample bed for a spectrometric device, characterised in that it includes a curved mirror. BRIEF DESCRIPTION OF THE DRAWING
The invention will now be described with reference to figure 1 schematically disclosing a spectrometric device according to a preferred embodiment of the present invention.
DESCRIPTION OF EMBODIMENTS
In figure 1 , a spectrometric device 1 is schematically shown. The device 1 includes, as a light source, a tungsten-halogen bulb 2, a parabolic mirror 3, a planar mirror 4, a housing H (only a portion thereof is shown in the figure) with an opening 5, a sample bed 6, and optical fibres 7 connected to a spectrometer 8. In the preferred embodiment seven optical fibres are used, of which only two are present in the figure, but fewer or more than seven optical fibres can be used. Any type of spectrometer sorting the light into specific wavelengths and recording the spectrum can be used, such as a grating-based system or an interferometer-based system.
The light from the bulb 2 is collimated by a parabolic reflecting mirror 3, which emits an illumination beam IB, indicated by interrupted arrows 9, to the planar mirror 4. This mirror is angled in such a way that the illumination beam IB is reflected so that the major part of this beam after reflection passes through the opening 5 in housing H as indicated by interrupted arrows 10. The sample bed 6 is placed beneath the opening 5 so that a collimated illumination beam falls on the sample bed. According to the invention the sample bed 6 includes a curved mirror 11 on the upper side thereof. The curvature of mirror 11 is so chosen that all incident light from opening 5 is reflected back through the opening 5 and is lost within the housing H. This is ensured by placing the sample bed on such a distance beneath the opening 5 that the focus of the mirror 11 of the sample bed 6 is located in the proximity of the opening 5. The reflected light from mirror 11 is indicated by interrupted arrows 12.
The optical fibres 7 are located outside of the opening 5 and is thereby outside the reach of light reflected from mirror 11 of the sample bed 6. The optical fibres are directed towards the centre of the curved mirror 11. When no sample is placed on the sample bed no light will thus reach the optical fibres 7.
In figure 1 , a small sample S is shown placed in the centre of mirror 11. As is evident from the figure, the incident beam indicated by interrupted arrows 10 has a much larger diameter than the perimeter of sample S which means that if the sample S had been placed on a planar sample bed a lot of light reflected from the area of the sample bed outside the perimeter of the sample S would have reached the optical fibres 7 and thereby the spectrometer 8. The spectral analysis would then have been disturbed and the light spectra would have been distorted. However, due to the curvature of mirror 11 all light reflected from the area outside of the perimeter of sample S will be reflected back into the opening without reaching the optical fibres 7. The light hitting the sample S will scatter in all directions and some of the reflected light will reach the optical fibres 7, as indicated by arrows 13 in figure 1. The light transferred by the optical fibres 7 to the spectrometer 8 will thus only be light reflected from sample S.
The present invention thus enables a spectrometric device used for analysing large samples to also analyse small samples just by substituting a planar sample bed with a sample bed according to the present invention and possibly adjusting the distance of the sample bed according to the present invention so that the focus of the curved mirror 11 will be located in the proximity of the light opening 5 in the housing H of the spectrometric device 1. The matching of a spectrometric device from analyses of large sample to analysing a small sample is thus very simple, cost effective and fast.
Since the mirror 11 of the sample bed (6) is curved, samples (S) placed thereon will have a tendency to automatically move to the centre of mirror 11.
The spectrometric device according to the present invention can be used for other types of small samples than single kernels or small samples of kernels, such as medical tablets. It can also be used for analysing drops or small samples of liquid, such as oils.
Figure 1 illustrates a device using broad band (white light) illumination and post dispersion of the light. A pre-dispersive system, in which the spectrometer is placed between the light source and the sample would function in the same way. The optical fibres then take the light to a photometric detector or detectors. Alternatively, the detectors can be located so that they can view the sample without aid of optical fibres. The embodiment described can be modified in several respects without leaving the scope of invention. Other suitable light sources than tungsten-bulbs can be used. Other means for collimating the light from the light source than a parabolic mirror can be used, such as a lens or systems of lenses and mirrors. The collimated illumination beam can be directed straight through the opening in the housing of the spectrometric device so that the angled planar mirror can be deleted. If several small samples are to be separately analysed, the sample bed can be a conveyer having a row of curved mirrors intermittently moved into place beneath the light opening in the spectrometric device. The invention shall therefore only be limited by the content of the enclosed patent claims.

Claims

Claims
1. A method of matching an illumination beam (IB) of a spectrometric device (1 ) to the shape and size of a small sample (S), characterised by the steps of placing the sample (S) on a curved mirror (11 ) having a curvature such that the incident light falling on the curved mirror from an opening (5) in the spectrometric device (1 ) is reflected back into said opening, and placing detectors (7) connected to a spectrometer outside of light beams reflected from the mirror (1 1 ).
2. The method according to claim 1 , wherein the curvature of the mirror (11 ) is chosen so that its focus lies proximate to said opening (5) in the spectrometric device (1 ).
3. A spectrometric device (1 ) including a light source (2) emitting an illumination beam (IB) through an opening (5) in the spectrometric device, a sample bed (6) disposed beneath said opening, and light detectors (7) connected to a spectrometer, characterised in that the sample bed (6) includes a curved mirror (1 1 ) having a curvature such that the incident light (10) falling on the curved mirror (11 ) from an opening (5) in the housing (H) spectrometric device is reflected back into said opening, and the detectors (7) connected to the spectrometer (8) are located outside of light beams reflected from the curved mirror (11 ).
4. The spectrometric device according to claim 3, wherein the focus of the curved mirror (11 ) lies proximate to said opening (5) in the housing (H) of the spectrometric device (1 ).
5. The spectrometric device according to claim 3 or 4, wherein the light detectors are optical fibres (7) connected to the spectrometer (8) .
6. Sample bed (6) for a spectrometric device, characterised in that it includes a curved mirror (11 ).
PCT/IB2008/053727 2008-09-15 2008-09-15 A spectrometric device WO2010029390A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IB2008/053727 WO2010029390A1 (en) 2008-09-15 2008-09-15 A spectrometric device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2008/053727 WO2010029390A1 (en) 2008-09-15 2008-09-15 A spectrometric device

Publications (1)

Publication Number Publication Date
WO2010029390A1 true WO2010029390A1 (en) 2010-03-18

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PCT/IB2008/053727 WO2010029390A1 (en) 2008-09-15 2008-09-15 A spectrometric device

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0260942A2 (en) * 1986-09-19 1988-03-23 Satake Engineering Co., Ltd. Measuring apparatus for amylose and/or amylopectin content in rice
JPH02143147A (en) * 1988-11-24 1990-06-01 Satake Eng Co Ltd Quality evaluating device for coffee bean
US20010055116A1 (en) * 1999-07-16 2001-12-27 Maczura Anthony K. Optical probes and methods for spectral analysis
US6421990B1 (en) * 1999-05-19 2002-07-23 Deere & Company Measuring device for measuring components in and/or properties of crop material
US6754600B2 (en) * 2000-04-13 2004-06-22 Mitsui Mining & Smelting Co., Ltd. Device for evaluating internal quality of vegetable or fruit, method for warm-up operation of the device, and method for measuring internal quality

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0260942A2 (en) * 1986-09-19 1988-03-23 Satake Engineering Co., Ltd. Measuring apparatus for amylose and/or amylopectin content in rice
JPH02143147A (en) * 1988-11-24 1990-06-01 Satake Eng Co Ltd Quality evaluating device for coffee bean
US6421990B1 (en) * 1999-05-19 2002-07-23 Deere & Company Measuring device for measuring components in and/or properties of crop material
US20010055116A1 (en) * 1999-07-16 2001-12-27 Maczura Anthony K. Optical probes and methods for spectral analysis
US6754600B2 (en) * 2000-04-13 2004-06-22 Mitsui Mining & Smelting Co., Ltd. Device for evaluating internal quality of vegetable or fruit, method for warm-up operation of the device, and method for measuring internal quality

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