WO2005024362A1 - Multispectral spectroscopy through tunable multispectral reflection between 200nm and 6000nm - Google Patents

Multispectral spectroscopy through tunable multispectral reflection between 200nm and 6000nm Download PDF

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Publication number
WO2005024362A1
WO2005024362A1 PCT/GR2004/000005 GR2004000005W WO2005024362A1 WO 2005024362 A1 WO2005024362 A1 WO 2005024362A1 GR 2004000005 W GR2004000005 W GR 2004000005W WO 2005024362 A1 WO2005024362 A1 WO 2005024362A1
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Prior art keywords
multispectral
infrared
monochromator
radiation
tuneable
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PCT/GR2004/000005
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French (fr)
Inventor
Christos Salpistis
Ioannis Chrisoulakis
Georgios Carayannis
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Christos Salpistis
Ioannis Chrisoulakis
Georgios Carayannis
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Application filed by Christos Salpistis, Ioannis Chrisoulakis, Georgios Carayannis filed Critical Christos Salpistis
Publication of WO2005024362A1 publication Critical patent/WO2005024362A1/en

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    • 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
    • G01J3/28—Investigating the spectrum
    • G01J3/2823—Imaging spectrometer
    • 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
    • G01J3/0235—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using means for replacing an element by another, for replacing a filter or a grating
    • 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
    • G01J3/0237—Adjustable, e.g. focussing
    • 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
    • G01J3/0291—Housings; Spectrometer accessories; Spatial arrangement of elements, e.g. folded path arrangements
    • 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
    • G01J3/04—Slit arrangements slit adjustment
    • 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
    • G01J3/12—Generating the spectrum; Monochromators
    • G01J3/18—Generating the spectrum; Monochromators using diffraction elements, e.g. grating
    • 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
    • G01J3/28—Investigating the spectrum
    • 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
    • G01N21/3563—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing solids; Preparation of samples therefor

Definitions

  • the present invention relates to a method and system of multispectral spectroscopy through tuneable multispectral reflectoscopy for examining and identifying art objects especially paintings.
  • BACKGROUND OF THE INVENTION For the examination of valuable objects it is already known the use of X-rays or UV-light radiation to scan a painting. However due to the short range of wavelengths the infiltration is not deep enough and the diffusively reflected radiation is not easy to collect for spectral analysis.
  • infrared reflectoscopy is used for tuneable infrared imaging in paintings, which constitutes a significant tool of investigation, especially when simultaneous spectroscopic data acquisition is performed in the same examined region, between 200 nm and 3500 nm.
  • spectroscopic data are collected from every point of the studied area between 200 nm and 6000 nm with a 5nm step through grey level measurements, after adequate infrared Reflectance (%R) curve calibration, taking into account the spectral detectability range of the infrared detector as well as the output power distribution of the radiation coming out through the micrometer slit assembly, of the monochromator in use.
  • %R infrared Reflectance
  • Inorganic pigments can thus be identified and their physicochemical behaviour directly compared to the corresponding infrared images at selected wavelengths inside this area.
  • SUMMARY OF THE INVENTION It is, therefore, an object of the present invention to provide a method and system of tuneable multispectral real time imaging for art objects , between 200 nm and 6000 nm, and simultaneous multispectral spectroscopic data acquisition from the same investigated region as well, which overcomes the deficiencies of the prior art.
  • a further aspect of the present invention is to provide system of an infrared reflectoscopy particular useful for delivering excitation light to an art object and collecting responce light from said art object
  • an infrared reflectoscopy system of tuneable multispectral real time imaging for art objects comprising at least an illumination source housing and power supply, a single element CaF 2 condenser, wherein a variable focusing is performed, a spectral analysis device such as a monochromator and an input port with a micrometer driven slit assembly, and a lateral output port also with a micrometer driven slit assembly.
  • Fig. 1 shows a block diagram of the infrared reflectoscopy system according to the present invention.
  • Fig. 2 shows a diagram of the power radiation curve per surface unit and wavelength in
  • Fig. 3 shows a diagram of the transmittance of a CaF 2 condensing lens according to the present invention.
  • Fig. 4 shows a schematic configuration of the monochromator's assembly according to the present invention.
  • Fig. 5 shows a diagram of the total efficiency curve related to the three gratings according to the present invention.
  • Fig. 6 shows a diagram of the normalized power distribution of the monochromator per surface unit (m W/mm 2 ) according to the present invention.
  • Fig. 7 shows a diagram of the normalized sensitivity curve of the infrared detector according to the present invention.
  • Fig. 8a shows an image in the visible area of the spectrum.
  • Fig. 8b shows the corresponding non-visible image under the image of Fig. 8a.
  • Fig. 9 shows a visible image of the under study area.
  • Figs. 9a to 9h show examples of the infrared images of the image of Fig. 9 at 800nm
  • Fig. 10 shows a diagram of the normalized transmittance of the infrared detector's lens according to the present invention.
  • Fig. 1 1 shows a diagram of the TMRS spectrum: lower curve and the UV/VIS/nIR spectrum: upper curve of the Cross area (1) of Fig. 9a according to the present invention.
  • Fig. 12 shows a diagram of the TMRS spectrum: lower curve and the UV/VIS/ nIR spectrum: upper curve of the Halo area (2) of the Fig. 9a according to the present invention.
  • Fig. 13 shows a diagram of the TMRS spectrum: lower curve and the UV/VIS/ nIR spectrum: upper curve of the Background area (3) of the Fig. 9a according to the present invention.
  • DETAILED DESRIPTION OF THE INVENTION Referring to the Figure 1 of the drawings a block diagram of the whole system according to the present invention is shown. Said system comprises an illumination source housing and power supply (1), a single element CaF 2 condenser (2),wherein a variable focusing is performed, a monochromator (3) comprising three gratings, an input port (4) with a Micrometer driven slit assembly, and a lateral output port (5) also with a Micrometer driven slit assembly.
  • the system further comprises a location for the painted artwork (6), a calibrated infrared detector (7), a fluorite lens (8), a motorized focusing system (9) and a computer (10).
  • An excitation illumination source delivers output power in the wavelength range from 200nm to 6000nm.
  • illumination source a high intensity arc lamp such as 1000 W Xenon due to it's flat spectral irradiance inside the spectral band (Fig.4).
  • the lamp is located inside the illumination source housing (1) with a heat blowing assembly.
  • a power supplier is also provided.
  • a CaF lens system is also provided in order to condense most of the radiated power from the arc lamp into the input port (4) of the monochromator (3).
  • the CaF 2 condensing lens has been selected because it presents more than 90% transmittance between 0.2 ⁇ m and 8 ⁇ m (Fig. 3).
  • the lens system has the possibility to be motorized in order to move back and forth as the focal length changes according to the wavelength of the radiation. In this way the incident radiation power on the input port (4) of the monochromator(3) will be maximized for each wavelength.
  • the incident radiation is then guided inside the monochromator' s assembly (3) using the appropriate mirrors Ml, M2, M3 and M4 (Fig.4) on a three gratings turret.
  • Each grating is used in order to spatially separate light of different wavelengths (Fig. 5).
  • the desired monochromatic radiation is separated and guided to the lateral output port of the monochromator, as soon as the grating turret is rotated around its axis.
  • the slits of the input and output ports of the monochromator system are micrometrically adjustable. Thus the bandwidth of the radiated light can be increased or reduced.
  • the minimum bandwidth containing a sufficient amount of radiation power is found to be 5nm.
  • gratings can be used according to their spectral band response (Fig. 5).
  • 1 st grating from 200 - 550nm
  • 2 nd grating from 550 - 1200nm
  • 3 rd grading from 1200 - 3500nm
  • the normalized output power distribution of the monochromator was measured and the obtained values between 800nm and 1900nm are presented in Fig. 6. This is the real output power distribution of the overall tuneable illuminating system taking into account the arc lamp, the CaF 2 condensing lens and the three gratings. Further, the output radiation from the monochromator strikes on the painted surface of the under study artwork (6). The reflected radiation from the artwork is then collected by the IR detector (7), the sensitivity of which is presented in Fig. 7.
  • the original is from the Ravenian school of the 14' century and is outstanding for the harmony of its colours, its plasticity and the perfection of its design.
  • the icon includes two pictures, one over the other.
  • the scene of the "Descent from the Cross " Fig.8a was painted over the icon of "Saint James " Fig. 8b, which was half covered with an intermediate preparation layer.
  • This intermediate layer constituted at the same time the preparation layer corresponding to the overlying picture of the "Descent from the Cross ".
  • TMRS Tuneable Monochromatic Radiation Source
  • R ⁇ inside the specified bandwidth (800nm-1900nm) is denoted by R.
  • the infrared detector and lens assembly system (Fig. 7 and 10 respectively) are denoted by C and L respectively.
  • the output of the overall system constitutes an ensemble of infrared images acquired by the IR detector for each wavelength between 800nm and 1900nm.
  • Grey level values were measured on the pre-delimited areas 1,2 and 3 (Fig. 9a) every lOnm through a specially created software. They are denoted by I ⁇ .
  • the final goal is to calculate the signal R ⁇ which is the reflectance coefficient of the measurement area of the artwork between 800nm and 1900nm, for each wavelength.
  • the signals M,R,C,L and I are the spectral responses of each subsystem displayed as follows.
  • INPUT Tuneable Monochromatic Radiation Source Signal (M)
  • the infrared diffuse radiation has been collected by the infrared detector, which is constantly positioned in front of the painted artwork. Nevertheless its power distribution changes according to the wavelength and incident radiation angle.
  • the spectroscopic data can be recorded using a UV/VIS/ nIR spectrophotometer in a diffuse reflectance mode.
  • the output infrared radiation power of the UV VIS/ nIR spectrophotometer used and that of the tuneable infrared reflectoscopy assembly do not have equal values. Thus their penetration depth is not the same; consequently the infrared information coming from the paint layers being underneath unequally affected infrared spectra which is collected from the painted surface.
  • the system can be software and hardware automated as a whole.
  • the infrared reflectoscopy can permit both, tuneable real time infrared imaging as well as infrared spectra acquisition, from every point of the painted surface under examination, inside the same spectral bandwidth.

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Abstract

The present invention relates to a powerful tool of investigation in art objects and particularly in paintings which enables both tuneable multispectral real time imaging, between 200 nm and 6000 nm, as well as simultaneous multispectral spectroscopic data acquisition from the same investigated region. At the same time, spectroscopic data are collected from every point of the area under examination between 200 nm and 6000 nm with a 5nm step through grey level measurements, after adequate infrared Reflectance (%R) curve calibration, taking into account the spectral detectability range of the infrared detector as well as the output power distribution of the radiation coming out through the micrometer slit assembly, of the monochromator in use. Inorganic pigments can thus be identified and their physicochemical behaviour directly compared to the corresponding infrared images at selected wavelengths inside this area.

Description

MULTISPECTRAL SPECTROSCOPY THROUGH TUNABLE MULTISPCTRAL REFLECTION BETWEEN 200NM AND 6000NM
TECHNICAL FIELD OF THE INVENTION The present invention relates to a method and system of multispectral spectroscopy through tuneable multispectral reflectoscopy for examining and identifying art objects especially paintings. BACKGROUND OF THE INVENTION For the examination of valuable objects it is already known the use of X-rays or UV-light radiation to scan a painting. However due to the short range of wavelengths the infiltration is not deep enough and the diffusively reflected radiation is not easy to collect for spectral analysis. In addition the first preliminary sketch on the preparation surface which has been painted, past or later underdrawings, ancient damages non visible to the naked human eye, later interventions or overpaintings, hidden signatures, non visible legends, authenticity features cannot be detected since the overlying paint layers cannot become successively "transparent". It is therefore a need for a novel powerful tool of investigation in art objects and particularly in paintings which enables both tuneable multispectral real time imaging, between 200 nm and 6000 nm, as well as simultaneous multispectral spectroscopic data acquisition from the same investigated region. The term "infrared reflectoscopy" is used for tuneable infrared imaging in paintings, which constitutes a significant tool of investigation, especially when simultaneous spectroscopic data acquisition is performed in the same examined region, between 200 nm and 3500 nm. At the same time, spectroscopic data are collected from every point of the studied area between 200 nm and 6000 nm with a 5nm step through grey level measurements, after adequate infrared Reflectance (%R) curve calibration, taking into account the spectral detectability range of the infrared detector as well as the output power distribution of the radiation coming out through the micrometer slit assembly, of the monochromator in use. Inorganic pigments can thus be identified and their physicochemical behaviour directly compared to the corresponding infrared images at selected wavelengths inside this area. SUMMARY OF THE INVENTION It is, therefore, an object of the present invention to provide a method and system of tuneable multispectral real time imaging for art objects , between 200 nm and 6000 nm, and simultaneous multispectral spectroscopic data acquisition from the same investigated region as well, which overcomes the deficiencies of the prior art. A further aspect of the present invention is to provide system of an infrared reflectoscopy particular useful for delivering excitation light to an art object and collecting responce light from said art object In accordance with the above objects of the present invention, an infrared reflectoscopy system of tuneable multispectral real time imaging for art objects, between 200 nm and 6000 nm, is provided comprising at least an illumination source housing and power supply, a single element CaF2 condenser, wherein a variable focusing is performed, a spectral analysis device such as a monochromator and an input port with a micrometer driven slit assembly, and a lateral output port also with a micrometer driven slit assembly. Further preferred embodiments of the present invention are defined in dependent claims 2 to 6.
Other objects and advantages of the present invention will become apparent to those skilled in the art in view of the following detailed description taken in conjuction with the accompanying drawings, wherein like reference numbers refer to similar parts throughout the drawings, and wherein:
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows a block diagram of the infrared reflectoscopy system according to the present invention.
Fig. 2 shows a diagram of the power radiation curve per surface unit and wavelength in
0.5 m distance (mW/m2/nm) from the source according to the present invention.
Fig. 3 shows a diagram of the transmittance of a CaF2 condensing lens according to the present invention.
Fig. 4 shows a schematic configuration of the monochromator's assembly according to the present invention.
Fig. 5 shows a diagram of the total efficiency curve related to the three gratings according to the present invention. Fig. 6 shows a diagram of the normalized power distribution of the monochromator per surface unit (m W/mm2) according to the present invention.
Fig. 7 shows a diagram of the normalized sensitivity curve of the infrared detector according to the present invention.
Fig. 8a shows an image in the visible area of the spectrum. Fig. 8b shows the corresponding non-visible image under the image of Fig. 8a.
Fig. 9 shows a visible image of the under study area.
Figs. 9a to 9h show examples of the infrared images of the image of Fig. 9 at 800nm,
1200nm, 1400nm, 1500nm, 1660nm, 1700nm, 1800nm, respectively according to the present invention. Fig. 10 shows a diagram of the normalized transmittance of the infrared detector's lens according to the present invention.
Fig. 1 1 shows a diagram of the TMRS spectrum: lower curve and the UV/VIS/nIR spectrum: upper curve of the Cross area (1) of Fig. 9a according to the present invention.
Fig. 12 shows a diagram of the TMRS spectrum: lower curve and the UV/VIS/ nIR spectrum: upper curve of the Halo area (2) of the Fig. 9a according to the present invention.
Fig. 13 shows a diagram of the TMRS spectrum: lower curve and the UV/VIS/ nIR spectrum: upper curve of the Background area (3) of the Fig. 9a according to the present invention. DETAILED DESRIPTION OF THE INVENTION Referring to the Figure 1 of the drawings a block diagram of the whole system according to the present invention is shown. Said system comprises an illumination source housing and power supply (1), a single element CaF2 condenser (2),wherein a variable focusing is performed, a monochromator (3) comprising three gratings, an input port (4) with a Micrometer driven slit assembly, and a lateral output port (5) also with a Micrometer driven slit assembly.
The system further comprises a location for the painted artwork (6), a calibrated infrared detector (7), a fluorite lens (8), a motorized focusing system (9) and a computer (10). An excitation illumination source delivers output power in the wavelength range from 200nm to 6000nm. As illumination source is used a high intensity arc lamp such as 1000 W Xenon due to it's flat spectral irradiance inside the spectral band (Fig.4). The lamp is located inside the illumination source housing (1) with a heat blowing assembly. A power supplier is also provided. A CaF lens system is also provided in order to condense most of the radiated power from the arc lamp into the input port (4) of the monochromator (3). The CaF2 condensing lens has been selected because it presents more than 90% transmittance between 0.2μm and 8μm (Fig. 3). The lens system has the possibility to be motorized in order to move back and forth as the focal length changes according to the wavelength of the radiation. In this way the incident radiation power on the input port (4) of the monochromator(3) will be maximized for each wavelength.
The incident radiation is then guided inside the monochromator' s assembly (3) using the appropriate mirrors Ml, M2, M3 and M4 (Fig.4) on a three gratings turret. Each grating is used in order to spatially separate light of different wavelengths (Fig. 5). The desired monochromatic radiation is separated and guided to the lateral output port of the monochromator, as soon as the grating turret is rotated around its axis. The slits of the input and output ports of the monochromator system are micrometrically adjustable. Thus the bandwidth of the radiated light can be increased or reduced. The minimum bandwidth containing a sufficient amount of radiation power is found to be 5nm.
The following gratings can be used according to their spectral band response (Fig. 5). 1st grating: from 200 - 550nm
2nd grating: from 550 - 1200nm 3rd grading: from 1200 - 3500nm
The normalized output power distribution of the monochromator was measured and the obtained values between 800nm and 1900nm are presented in Fig. 6. This is the real output power distribution of the overall tuneable illuminating system taking into account the arc lamp, the CaF2 condensing lens and the three gratings. Further, the output radiation from the monochromator strikes on the painted surface of the under study artwork (6). The reflected radiation from the artwork is then collected by the IR detector (7), the sensitivity of which is presented in Fig. 7.
The effectiveness of the proposed methodology has been finally tested on a portable experimental icon of known stratigraphy (Fig. 8). Infrared images were collected every lOnm from a delimited surface area (Fig. 8) inside which infrared spectroscopic data were simultaneously collected from 800nm to 1900nm on three distinct areas 1, 2 and 3 in diffuse reflectance mode. Grey level measurements were then taken from the acquired infrared images (Fig.9) using our tuneable infrared reflectoscopy assembly and the obtained results were processed after adequate calibration and corrections The experimental icon "Descent from the Cross ". A Short description
The original is from the Macedonian school of the 14' century and is outstanding for the harmony of its colours, its plasticity and the perfection of its design. The icon includes two pictures, one over the other. The scene of the "Descent from the Cross " Fig.8a was painted over the icon of "Saint James " Fig. 8b, which was half covered with an intermediate preparation layer. This intermediate layer constituted at the same time the preparation layer corresponding to the overlying picture of the "Descent from the Cross ".
The overall procedure which was followed in order to obtain the desired spectral information from the monochromatic images which were already acquired using the tuneable infrared reflectoscopy system can be summarized as follows:
The overall system according to the theory of signal processing and systems can be described by three subsystems with known transfer functions:
The Tuneable Monochromatic Radiation Source (TMRS). The normalized, to the unit value, power distribution between 800nm and 1900nm of this subsystem is already presented in Fig. 6 and denoted by the signal M.
The artwork response which constitutes the reflectance coefficient for each wavelength,
Rχ, inside the specified bandwidth (800nm-1900nm) is denoted by R.
The infrared detector and lens assembly system (Fig. 7 and 10 respectively) are denoted by C and L respectively.
The output of the overall system constitutes an ensemble of infrared images acquired by the IR detector for each wavelength between 800nm and 1900nm. Grey level values were measured on the pre-delimited areas 1,2 and 3 (Fig. 9a) every lOnm through a specially created software. They are denoted by Iχ.
The final goal is to calculate the signal Rχ which is the reflectance coefficient of the measurement area of the artwork between 800nm and 1900nm, for each wavelength. The signals M,R,C,L and I are the spectral responses of each subsystem displayed as follows.
INPUT: Tuneable Monochromatic Radiation Source Signal (M)
ARTWORK:Transfer Function (R)
Infrared detector and lens system;Transfer Functions (C, L)
OUTPUT: Stored Images from the infrared detector system (I)
Thus we can obtain the Rχ signal using the following formula for each wavelength. I, R, = wherein λ is the wavelength. MλCλLλ This method is then applied on three selected surface areas of the experimental icon (Fig. 9a), and Rλ=f(wavelength) curves are presented in Figures 11, 12 and 13 corresponding to the three pre-delimited measurement areas 1,2 and 3 respectively.
The infrared diffuse radiation has been collected by the infrared detector, which is constantly positioned in front of the painted artwork. Nevertheless its power distribution changes according to the wavelength and incident radiation angle.
The spectroscopic data can be recorded using a UV/VIS/ nIR spectrophotometer in a diffuse reflectance mode.
The output infrared radiation power of the UV VIS/ nIR spectrophotometer used and that of the tuneable infrared reflectoscopy assembly do not have equal values. Thus their penetration depth is not the same; consequently the infrared information coming from the paint layers being underneath unequally affected infrared spectra which is collected from the painted surface.
From all these obtained experimental results we can conclude that: - Rr=f( wave length) curves seem to have nearly the same shape compared to that obtained through a UV/Vis/nIR spectrophotometer in diffuse reflectance mode, for the same pre- delimited surface areas; this is an encouraging recording.
- The system can be software and hardware automated as a whole.
- The infrared reflectoscopy can permit both, tuneable real time infrared imaging as well as infrared spectra acquisition, from every point of the painted surface under examination, inside the same spectral bandwidth. These spectra, Rχ=f(wavelength), will provide us with all the necessary information, thus substituting reference infrared spectra which are normally provided by an nIR diffuse reflectance spectrophotometer. While preferred embodiments have been shown and described obviously minor modifications in design and construction can be effected in the invention without departing from the spirit and scope thereof, as defined in the appended claims.

Claims

1. An infrared reflectoscopy system of tuneable multispectral real time imaging for art objects, between 200 nm and 6000 nm, which system at least comprises an illumination source housing and power supply (1), a lens system (2),wherein a variable focusing is performed, a spectral analysis device such as a monochromator (3) and an input port (4) with a micrometer driven slit assembly, and a lateral output port (5) also with a micrometer driven slit assembly.
2. The system according to claim 1, further comprises a location for the painted artwork (6), a calibrated infrared detector (7), a fluorite lens (8), a motorized focusing system (9) and a computer (10).
3. The system according to claim 1, wherein said illumination source delivers a radiation in the range of 200nm to 6000nm.
4. The system according to any preceding claim, wherein said monochromator (3) comprises at least three gratings.
5. The system according to any preceding claim, wherein said CaF2 lens system is able to condense most of the radiated power from the arc lamp into the input port (4) of the monochromator (3).
6. The system according to any preceding claim, wherein said lens system is provided with means in order to move back and forth as the focal length changes according to the wavelength of the radiation.
PCT/GR2004/000005 2003-09-05 2004-01-26 Multispectral spectroscopy through tunable multispectral reflection between 200nm and 6000nm WO2005024362A1 (en)

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GR20030100368A GR20030100368A (en) 2003-09-08 2003-09-08 HIGH-RESOLUTION REFLECTOSCOPY SYSTEM OF GREAT DETECTION ABILITY AND CONTINUOUSLY VARIABLE WAVELENGTH RANGING FROM 200 nm TO 6000 nm

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WO2016012794A3 (en) * 2014-07-23 2016-03-24 Andor Technology Limited Spectrometer
CN107170013A (en) * 2017-05-03 2017-09-15 北京理工大学 A kind of scaling method of RGB camera spectral response curve
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CN114608809B (en) * 2022-04-01 2024-05-03 中国工程物理研究院激光聚变研究中心 Device and method for measuring variable-angle spectral reflectance of large-caliber optical element

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