WO2000077493A2 - Vorrichtung zur messung von feuchtigkeit und reflexionsvermögen von oberflächen - Google Patents
Vorrichtung zur messung von feuchtigkeit und reflexionsvermögen von oberflächen Download PDFInfo
- Publication number
- WO2000077493A2 WO2000077493A2 PCT/DE2000/001892 DE0001892W WO0077493A2 WO 2000077493 A2 WO2000077493 A2 WO 2000077493A2 DE 0001892 W DE0001892 W DE 0001892W WO 0077493 A2 WO0077493 A2 WO 0077493A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- beam splitter
- mirror
- measuring
- light
- detectors
- Prior art date
Links
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 230000003595 spectral effect Effects 0.000 claims abstract description 4
- 238000000295 emission spectrum Methods 0.000 claims abstract description 3
- 238000010521 absorption reaction Methods 0.000 claims abstract 2
- 230000001678 irradiating effect Effects 0.000 claims abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract 2
- 239000000835 fiber Substances 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 4
- 238000002310 reflectometry Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 11
- 238000000034 method Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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
- G01N21/25—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
-
- 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
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3554—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for determining moisture content
- G01N21/3559—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for determining moisture content in sheets, e.g. in paper
-
- 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
- G01N21/55—Specular reflectivity
- G01N21/57—Measuring gloss
-
- 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
- G01N21/84—Systems specially adapted for particular applications
- G01N21/86—Investigating moving sheets
Definitions
- the invention relates to a device for measuring moisture
- the object of the invention is a device of the e. G. Provide a way that enables accurate measurements even with rapidly changing distance of the measurement object. This object is achieved by the features of patent claim 1.
- the subclaims describe advantageous configurations of the device.
- the claim 9 relates to an advantageous use of the device.
- a particular advantage of the invention is that in addition to moisture measurement with the aid of the tiltable mirror 7, a gloss determination can be carried out.
- This mirror enables internal calibration.
- the use of this mirror enables a compact, flat structure, since all measuring beams within the measuring device run in one plane parallel to the measuring plane.
- FIG. 1 shows the schematic structure of a device according to the invention and FIG. 2 shows a section perpendicular to it.
- the lamp 1 shows the lamp 1 at the top left.
- the light from the lamp 1 is coupled into a fiber-optic fiber 16 using suitable optics.
- the output of the fiber optic is with a converging lens via the beam splitter 2 (the reflected portion), the mirror 3 (the surfaces are painted by mirror 3 and beam splitter 2 are parallel and lie in one plane with the incident beam) and the deflecting mirror 7 the measuring spot 9, shown in the maximum permissible distance between the device and the measuring surface. This ensures that the measuring spot 9 can only be smaller in diameter with smaller distances between the arrangement and the measuring surface.
- the output of the light guide 16 is imaged by the beam splitter 2 (transmitted portion) and via the deflecting mirror 7 onto the measuring spot 8.
- the image is blurred at all smaller distances, but the illumination of the measurement spot is homogeneous (with a suitable fiber-optic light guide 17, for example a statistically mixed fiber bundle).
- the converging lens 6 sees the measuring spots 8 and 9 via the deflecting mirror 7, the beam splitter 2 and the deflecting mirror 3 and images them on the detector level, possibly with the aid of further lenses.
- the middle image is the image of the measuring spot 9 over the deflecting mirror 7, the mirror 3 through the beam splitter 2 through with the help of the lens 6, superimposed by the image of the measuring spot 8, over the deflecting mirror 7, the beam splitter 2 and the lens 6.
- the two outer images are the images of the measuring spot 8 via the mirror 3 and the image of the measuring spot 9 above the mirror 2, the wider beam path is described above. These two disturbing images are masked out, since the angle of incidence, and thus the measurement signal, would change as the distance between the device and the measurement surface changes, and the measurement system could therefore no longer be used independently of the distance.
- the aperture required for this is not shown here.
- the remaining image is divided between the two detectors 4, 5 by a beam splitter 10, which preferably consists of a dichroic mirror (color splitter).
- Dichroic mirrors have the advantage over simple beam splitters that a significantly higher usable intensity is available for the detectors. When using a short or long pass filter as beam splitter 10, the gain in intensity is somewhat less.
- Filters 11 and 12 limit the spectral ranges to the desired limits.
- the difference 15 of the two logarithmic detector signals 13, 14 results in the quotient from the two measured radiation intensities. If the optical conditions are the same for both channels, differences in brightness are reduced due to changes in the distance between the device and the test object and due to contamination.
- two light-emitting diodes with suitable emission spectra can also be used. These can be modulated with different frequencies.
- the light emitted by the two diodes can advantageously be combined with a corresponding statistically mixed fork light guide or a dichroic mirror. This means that a single detector can be used as a detection device for the measuring radiation.
- the filters 11, 12 and the color splitter 10 are omitted.
- the sectional view of FIG. 2 shows the effect of the tiltable mirror 7 on the incident measuring beam from the lamp 1, via the light guide 17, the lens 16 and the beam splitter 2 on the measuring surface 8.
- the gloss of the surface can be determined. Deviations from this angle enable the diffuse reflection to be recorded, from which the moisture of the surface can be determined.
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU59647/00A AU5964700A (en) | 1999-06-16 | 2000-06-15 | Device for measuring the humidity and reflectance of surfaces |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19927452A DE19927452C2 (de) | 1999-06-16 | 1999-06-16 | Vorrichtung zur Messung von Feuchtigkeit und Reflexionsvermögen von Oberflächen |
DE19927452.5 | 1999-06-16 |
Publications (3)
Publication Number | Publication Date |
---|---|
WO2000077493A2 true WO2000077493A2 (de) | 2000-12-21 |
WO2000077493A3 WO2000077493A3 (de) | 2001-04-19 |
WO2000077493A8 WO2000077493A8 (de) | 2003-08-14 |
Family
ID=7911424
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2000/001892 WO2000077493A2 (de) | 1999-06-16 | 2000-06-15 | Vorrichtung zur messung von feuchtigkeit und reflexionsvermögen von oberflächen |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU5964700A (de) |
DE (1) | DE19927452C2 (de) |
WO (1) | WO2000077493A2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2824138A1 (fr) * | 2001-04-27 | 2002-10-31 | Usinor | Dispositif de mesure de brillance du type reflectometre |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3675019A (en) * | 1971-03-19 | 1972-07-04 | Measurex Corp | Apparatus for measuring the amount of a substance that is associated with a base material |
US4787238A (en) * | 1984-10-08 | 1988-11-29 | Dai Nippon Insatsu Kabushiki Kaisha | Method and device for measuring the quantity of water dampening the face of an offset printing plate |
US4840706A (en) * | 1983-09-26 | 1989-06-20 | The Wiggins Teape Group Limited | Method and apparatus for measuring water content |
US4884697A (en) * | 1988-06-21 | 1989-12-05 | Takacs Peter Z | Surface profiling interferometer |
US5067817A (en) * | 1990-02-08 | 1991-11-26 | Bauer Associates, Inc. | Method and device for noncontacting self-referencing measurement of surface curvature and profile |
US5891656A (en) * | 1992-09-14 | 1999-04-06 | Sri International | Up-converting reporters for biological and other assays using laser excitation techniques |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US384553A (en) * | 1888-06-12 | Sash-fastener | ||
US3614450A (en) * | 1969-02-17 | 1971-10-19 | Measurex Corp | Apparatus for measuring the amount of a substance that is associated with a base material |
IT982680B (it) * | 1972-04-10 | 1974-10-21 | Infra Systems Inc | Sistema di misura mediante radia zione infrarossa |
US3792271A (en) * | 1972-06-30 | 1974-02-12 | Asea Ab | Means for determining moisture content and/or surface weight |
DE3149809A1 (de) * | 1981-12-16 | 1983-07-21 | Robert Bosch Gmbh, 7000 Stuttgart | Vorrichtung zum herstellen evakuierter beutelpackungen |
DE3336659C2 (de) * | 1982-10-12 | 1993-10-07 | Sentrol Systems Ltd | Meßgerät zum Bestimmen des Profils des Feuchtigkeitsgehalts einer Materialbahn quer zu ihrer Laufrichtung |
DE3611645A1 (de) * | 1986-04-07 | 1987-10-08 | Grapho Metronic Gmbh & Co | Verfahren und vorrichtung zur regelung der farb- und feuchtmittelanteile einer emulsionsschicht auf der druckplatte einer offset-druckmaschine |
DE4131835A1 (de) * | 1991-09-22 | 1993-03-25 | Optronik Gmbh Berlin Opto Elek | Fehlererkennungsgeraet |
DE4321177A1 (de) * | 1993-06-25 | 1995-01-05 | Heidelberger Druckmasch Ag | Vorrichtung zur parallelen Bildinspektion und Farbregelung an einem Druckprodukt |
DE19831612A1 (de) * | 1998-07-14 | 2000-01-20 | Voith Sulzer Papiermasch Gmbh | Meßsystem |
-
1999
- 1999-06-16 DE DE19927452A patent/DE19927452C2/de not_active Expired - Fee Related
-
2000
- 2000-06-15 WO PCT/DE2000/001892 patent/WO2000077493A2/de active Application Filing
- 2000-06-15 AU AU59647/00A patent/AU5964700A/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3675019A (en) * | 1971-03-19 | 1972-07-04 | Measurex Corp | Apparatus for measuring the amount of a substance that is associated with a base material |
US4840706A (en) * | 1983-09-26 | 1989-06-20 | The Wiggins Teape Group Limited | Method and apparatus for measuring water content |
US4787238A (en) * | 1984-10-08 | 1988-11-29 | Dai Nippon Insatsu Kabushiki Kaisha | Method and device for measuring the quantity of water dampening the face of an offset printing plate |
US4884697A (en) * | 1988-06-21 | 1989-12-05 | Takacs Peter Z | Surface profiling interferometer |
US5067817A (en) * | 1990-02-08 | 1991-11-26 | Bauer Associates, Inc. | Method and device for noncontacting self-referencing measurement of surface curvature and profile |
US5891656A (en) * | 1992-09-14 | 1999-04-06 | Sri International | Up-converting reporters for biological and other assays using laser excitation techniques |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2824138A1 (fr) * | 2001-04-27 | 2002-10-31 | Usinor | Dispositif de mesure de brillance du type reflectometre |
Also Published As
Publication number | Publication date |
---|---|
AU5964700A (en) | 2001-01-02 |
WO2000077493A3 (de) | 2001-04-19 |
DE19927452A1 (de) | 2001-01-25 |
DE19927452C2 (de) | 2001-05-03 |
WO2000077493A8 (de) | 2003-08-14 |
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