EP4616177A1 - Vorrichtung zur untersuchung von stoffproben mittels elektromagnetischer strahlung mit wählbarer lichtquelle - Google Patents
Vorrichtung zur untersuchung von stoffproben mittels elektromagnetischer strahlung mit wählbarer lichtquelleInfo
- Publication number
- EP4616177A1 EP4616177A1 EP23804650.2A EP23804650A EP4616177A1 EP 4616177 A1 EP4616177 A1 EP 4616177A1 EP 23804650 A EP23804650 A EP 23804650A EP 4616177 A1 EP4616177 A1 EP 4616177A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- radiation
- material sample
- deflection element
- electromagnetic radiation
- mirror
- 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.)
- Pending
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
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/256—Arrangements using two alternating lights and one detector
-
- 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
- G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
- G01J1/0411—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings using focussing or collimating elements, i.e. lenses or mirrors; Aberration correction
-
- 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
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N2021/6417—Spectrofluorimetric devices
- G01N2021/6419—Excitation at two or more 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
- G01N21/55—Specular reflectivity
-
- 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
- G01N2201/062—LED's
-
- 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
- G01N2201/0636—Reflectors
Definitions
- the invention relates to a device for examining material samples by means of electromagnetic radiation according to the preamble of claim 1.
- optical measuring methods are used to evaluate the condition or quality of a product or an intermediate product.
- the term "optical measuring method” is understood below to mean a measuring method using electromagnetic radiation, in particular electromagnetic radiation in a spectral range between infrared and ultraviolet. "Optical measurement” therefore includes in particular a measurement in the spectral ranges far infrared (FIR), mid infrared (MIR), near infrared (NIR), in the visible spectral range and in the UV range.
- FIR far infrared
- MIR mid infrared
- NIR near infrared
- biochemical samples can be labeled with two or more fluorescent carriers so that they glow differently when excited with different wavelengths of light. In this way, biochemical properties can be measured.
- the object of the present invention is to propose a device for examining material samples by means of electromagnetic radiation, which can comprise a plurality of radiation sources that can be selectively directed at the material sample.
- the device should allow a quick and easy change between the different radiation sources.
- a device comprises at least two radiation sources for generating electromagnetic radiation, a deflection element for deflecting this radiation onto a material sample located in an observation area and at least one detector for detecting the electromagnetic radiation emanating from the material sample.
- the deflection element is movable in such a way that the radiation from one radiation source or the radiation from the other radiation source is selectively directed onto the material sample by means of the deflection element.
- direction or “deflection” refers to a change in the direction of the radiation emitted by the radiation source.
- This type of device design has the advantage that several radiation sources can be provided, which can be used to illuminate the material sample by simply moving the deflection element.
- the deflection element is mounted so that it can rotate, in such a way that the axis of rotation is aligned parallel to the direction of propagation of the deflected radiation.
- the two or more radiation sources can be arranged on a circular arc around the deflection element, and by rotating the deflection element, the radiation from one or the other radiation source can be directed onto the material sample as desired, without any further adjustments being necessary.
- At least two of the radiation sources are designed in the same way. This enables redundant lighting, particularly in problematic environments in which, for example, filaments of halogen lamps or anodes of mercury vapor lamps can tear or break off due to mechanical stress, vibrations, etc.
- at least two of the radiation sources are designed differently, for example they emit radiation in different spectral ranges, with different intensities, etc. This enables the selection of a radiation source that is optimally suited to the respective measurement task. It also enables the radiation source to be switched quickly if radiation of different wavelengths is to be directed successively onto the material sample for a given measurement task.
- the deflection element advantageously has beam-forming properties.
- the deflection element can be designed in such a way that it focuses the radiation emitted by the radiation source onto the material sample; such a design is particularly advantageous when small objects are to be examined.
- the deflection element can expand (defocus) the beam emitted by the radiation source, which can be advantageous, for example, in applications of reflection spectroscopy in the visible or infrared spectral range when the material sample is to be illuminated over a large area.
- the deflection element can in particular comprise a mirror.
- a parabolic mirror can be used, which has a collimation effect that is advantageous for spectroscopic measurements.
- the deflection element can have an opening for the passage of electromagnetic radiation. This is particularly useful if the spectrum or the intensity of the radiation reflected by the material sample in the direction of incidence is to be measured, for example in the course of determining the intensity or functional testing in transmission measurements. It is also advantageous to connect an optical fiber in the area of this passage opening, by means of which the radiation entering the opening can be passed on to the detector. It is particularly advantageous to provide an optical fiber rod in the area of the opening, which passes the radiation reflected by the material sample in the direction of incidence through the deflection element with little loss. In addition to detecting the radiation reflected by the material sample, it may be desirable to detect the radiation transmitted by the material sample.
- an optical element can be arranged on the side of the observation area facing away from the deflection element, with the help of which the electromagnetic radiation emanating from the material sample is focused.
- This optical element is used to couple the radiation into a fiber connected to a detector or to focus it directly onto a detector surface. Accordingly, a detector or an end face of an optical fiber can be arranged in the focus of this optical element, with the help of which the radiation is passed on to a detector.
- a validation element can be provided in the beam path between the deflection element and the material sample.
- This validation element can be, for example, a white reference or a filter or filter wheel, which is advantageously provided with recesses for transmission measurements.
- Figure 3 shows a further schematic sectional view of the lighting device of Figure 2 with rotated deflection element
- Figure 4 is a schematic perspective view of a device with multiple radiation sources and multiple detectors
- Figure 5 is a schematic perspective view of an alternative device with multiple radiation sources and multiple detectors.
- Figure 1 shows a first embodiment of a device 10 for examining material samples using electromagnetic radiation.
- the device 10 comprises a housing 12 in which an illumination device 20 for generating the electromagnetic radiation and a detector 60 for detecting the electromagnetic radiation emitted by the material sample are arranged.
- Below a base plate 13 of the housing 12 there is an observation area 42 in which the material sample 40 to be examined (not shown in Figure 1) is arranged.
- Figure 2 shows a schematic sectional view of the lighting device 20.
- the lighting device 20 comprises two radiation sources 21, 21', whose beams 22, 22' are directed at a deflection element 23.
- halogen lamps are used as radiation sources 21, 21', which are provided with different wavelength-selective filters 32, 32', as a result of which the emerging radiation has different spectral properties.
- LEDs with a narrow emission range in different spectral ranges can be used as radiation sources.
- the two radiation sources 21, 21' are arranged diametrically opposite one another, so that their respective optical axes are aligned with one another.
- the deflection element 23 serves to selectively direct the rays 22 of the first radiation source 21 or the rays 22' of the second radiation sources 21' onto the fabric sample 40, which is arranged in the observation area 42 below the lighting device 20 on an observation table 42'.
- the deflection element 23 comprises a mirror 24, in this embodiment a concave mirror 24', which can be rotated about an axis of rotation 26 perpendicular to the direction of propagation of the rays 22, 22'.
- the mirror 24 is in a central position in which neither light from the radiation source 21 nor light from the radiation source 21' is directed onto the fabric sample 40.
- the mirror 24 By rotating the deflection element 23 about the axis of rotation 26, the mirror 24 can be brought into the position shown in Figure 3, in which the radiation 22 of the first radiation source 21 is deflected by the mirror 24 and focused on the material sample 40, while the radiation 22' of the second radiation source 21' is blocked by the deflection element 23. With the help of the mirror 24, the radiation 21 is reflected in a propagation direction 27, which is parallel - and in the present embodiment collides - near - to the axis of rotation 26 of the deflection element 23.
- a drive unit 35 is provided for rotating the mirror 24.
- the mirror 24 can be rotated by 180° from the position shown in Figure 3, so that radiation 22' from the second radiation source 21' reaches the fabric sample 40, while the radiation 22 from the first radiation source 21 is blocked by the deflection element 23.
- the radiation sources 21, 211 there may be further radiation sources (not shown in the figures) which are arranged in a great circle in a plane perpendicular to the axis of rotation 26 of the mirror 24. By rotating the mirror 24, the light from one of these radiation sources can alternatively be directed onto the fabric sample 40 - as described above.
- the rotation of the mirror 24 can be continuous or step-by-step. Thus, by continuously rotating the mirror 24, radiation from one or the other radiation source 21, 21' can be directed onto the material sample 40 at regular time intervals. Alternatively, the mirror 24 can be rotated for positioning. In particular, the rotation of the mirror 24 can only take place when necessary, e.g. in the event that the radiation source 21 fails due to a defect and therefore an (identical) radiation source 21' is to be used to measure the material sample 40.
- the deflection element 23 is provided with an opening 25 through which radiation reflected by the material sample 40 in the direction of incidence 27 can be guided outwards.
- a light wave rod 36 can be provided in the area of the opening 25.
- the radiation guided through the deflection element 23 by means of the light wave rod 36 is passed on to the detector 60 using an optical waveguide 29, for example a fiber 29', and analyzed there.
- This reflected radiation can be used, for example, to determine the intensity in transmission measurements or to determine a spectrum reflected by the material sample 40.
- an optical element 45 is provided, by means of which the The radiation 44 emanating from the material sample 40 or transmitted by the material sample 40 is focused.
- an end face 50 of a further optical waveguide 49 can be arranged, with which the radiation 44 is guided into the detector 60.
- a further detector can be arranged in the focus of the optical element 45.
- the lighting device 20 is closed off from the environment by an observation window 31, in particular a sapphire window, in order to prevent dust and other contaminants from penetrating the interior of the lighting device.
- a validation element 30 for calibrating the device 10 and/or for validating measurements can be present in the radiation path 28 after the mirror 24.
- This validation element 30 can in particular be a white reference or a filter or filter wheel (with a recess for transmission measurements).
- further radiation sources can be provided which are arranged together with the radiation sources 21, 2T in a plane perpendicular to the axis of rotation 26 of the deflection element 23, so that their rays can be directed onto the material sample 40 by rotating the mirror 24.
- Figure 4 shows a further device 10' for examining a material sample 40 with the aid of an illumination device 20' and a detection device 70'.
- the illumination device 20' essentially corresponds to the illumination device shown in Figures 2 and 3 with two radiation sources 21, 2T and is tilted at an angle of incidence 80, for example 45°, relative to the material sample 40.
- the detection device 70' comprises two detectors 71, 7T and is in an angular position tilted at an angle of reflection 80' relative to the material sample 40.
- the radiation 78 emitted by the material sample 40 in the radiation direction 77 can be directed optionally to one of the two detectors 71, 7T by a deflection unit 73 integrated in the detection device 70'.
- the deflection unit 73 comprises a mirror 74, in the present case a concave mirror 74'.
- the Mirror 74 can be rotated about an axis of rotation 76 with the aid of a drive unit 35'.
- the mirror 24 is in a position in which the radiation 78 reflected by the material sample 40 in the direction 80' is focused via the mirror 74 onto the detector 71, while the second detector 71' is shielded from the radiation 78 by the deflection element 73.
- Rotating the mirror 74' by 180° directs the radiation 78 onto the second detector 71', while the first detector 71 is shielded.
- suitable wavelength-selective filters 79, 79' which are arranged in front of the detectors 71, 71', the intensity of the radiation 78 in different wavelength ranges can be measured by means of the detectors 71, 71'.
- Figure 5 shows a device 10" for examining a material sample 40 with the aid of the illumination device 20' and the detection device 70', which in this embodiment are both arranged perpendicular to the material sample 40.
- the material sample 40 can be illuminated by means of the illumination device 20' with radiation from the radiation source 21 or the radiation source 21'.
- the radiation 78 reflected by the material sample 40 in the direction of incidence 27 is guided by means of a light guide rod 36 through the deflection element 23 of the illumination device 20' and strikes the detection device 70', in which the radiation 78 can be directed optionally to the detector 71 or the detector 72.
Landscapes
- Physics & Mathematics (AREA)
- General 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)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022129498.6A DE102022129498A1 (de) | 2022-11-08 | 2022-11-08 | Vorrichtung zur Untersuchung von Stoffproben mittels elektromagnetischer Strahlung |
| PCT/EP2023/081135 WO2024100109A1 (de) | 2022-11-08 | 2023-11-08 | Vorrichtung zur untersuchung von stoffproben mittels elektromagnetischer strahlung mit wählbarer lichtquelle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4616177A1 true EP4616177A1 (de) | 2025-09-17 |
Family
ID=88757580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23804650.2A Pending EP4616177A1 (de) | 2022-11-08 | 2023-11-08 | Vorrichtung zur untersuchung von stoffproben mittels elektromagnetischer strahlung mit wählbarer lichtquelle |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20250264357A1 (de) |
| EP (1) | EP4616177A1 (de) |
| DE (1) | DE102022129498A1 (de) |
| WO (1) | WO2024100109A1 (de) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10038185C2 (de) | 2000-08-04 | 2003-05-28 | Siemens Ag | Einrichtung zum Erfassen von unterschiedlichen Fluoreszenzsignalen eines mit verschiedenen Anregungswellenlängen ganzflächig beleuchteten Probenträgers |
| US8917432B2 (en) * | 2012-03-13 | 2014-12-23 | Kla-Tencor Corporation | Multiplexing EUV sources in reticle inspection |
| EP2787332B1 (de) * | 2013-04-03 | 2019-02-20 | Sick Ag | Spektrometer und Verfahren zum Betrieb |
| CN104237125A (zh) * | 2013-06-07 | 2014-12-24 | 西克股份公司 | 双通道测量装置 |
| EP3321658B1 (de) * | 2016-11-09 | 2018-09-26 | Sick Ag | Zweikanaliges messgerät |
| EP3614130B1 (de) * | 2018-08-22 | 2021-11-24 | Berthold Technologies GmbH & Co. KG | Vorrichtung zur ermittlung optischer eigenschaften von proben |
| GB2587780B (en) * | 2019-06-28 | 2021-10-20 | Protea Ltd | In-situ infra-red & ultra-violet photometer |
| US20220386875A1 (en) * | 2019-10-28 | 2022-12-08 | Yoshihiro Oba | Measuring apparatus and biological information measuring apparatus |
-
2022
- 2022-11-08 DE DE102022129498.6A patent/DE102022129498A1/de active Pending
-
2023
- 2023-11-08 WO PCT/EP2023/081135 patent/WO2024100109A1/de not_active Ceased
- 2023-11-08 EP EP23804650.2A patent/EP4616177A1/de active Pending
-
2025
- 2025-05-08 US US19/202,755 patent/US20250264357A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024100109A1 (de) | 2024-05-16 |
| DE102022129498A1 (de) | 2024-05-08 |
| US20250264357A1 (en) | 2025-08-21 |
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