WO1994015183A1 - Source de rayonnement - Google Patents

Source de rayonnement Download PDF

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Publication number
WO1994015183A1
WO1994015183A1 PCT/FI1992/000359 FI9200359W WO9415183A1 WO 1994015183 A1 WO1994015183 A1 WO 1994015183A1 FI 9200359 W FI9200359 W FI 9200359W WO 9415183 A1 WO9415183 A1 WO 9415183A1
Authority
WO
WIPO (PCT)
Prior art keywords
chassis
light element
radiation
light
radiation source
Prior art date
Application number
PCT/FI1992/000359
Other languages
English (en)
Inventor
Jouko Malinen
Heimo KERÄNEN
Original Assignee
Valtion Teknillinen Tutkimuskeskus
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to FI913181A priority Critical patent/FI89631C/fi
Priority claimed from FI913181A external-priority patent/FI89631C/fi
Application filed by Valtion Teknillinen Tutkimuskeskus filed Critical Valtion Teknillinen Tutkimuskeskus
Priority to PCT/FI1992/000359 priority patent/WO1994015183A1/fr
Priority to AU31609/93A priority patent/AU3160993A/en
Publication of WO1994015183A1 publication Critical patent/WO1994015183A1/fr

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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
    • G01J3/10—Arrangements of light sources specially adapted for spectrometry or colorimetry

Definitions

  • the present invention concerns a radiation source as defined in the preamble to Claim 1.
  • a radiation source is known through the Finnish Patent No. 77736 which comprises a plurality of light-emitting diodes, that is LEDs, which are arranged in a row with a small mutual spac ⁇ ing, optical means for separating the desired wavelength range from the radiation produced by said LEDs and for directing it through an exit slit or equivalent, out from the radiation source.
  • This radia ⁇ tion source further includes means for maintaining the intensity of the output radiation constant, or at de- sired level.
  • the object of the invention is to eliminate the problems mentioned. Specifically, the object of the invention is to provide a simple radiation source appropriate for series production and which can be used in numerous applications of analyzer technique in the near infra-red and infra-red range, and in those of colour measuring technique in the visible light range.
  • the radiation source of the invention is characterized by that which is stated in the appended Claim 1.
  • the radiation source of the invention com ⁇ prises a chassis including a space transparent to rad ⁇ iation; a plurality of light elements, such as light emitting diodes, LEDs.
  • LED in this case refers to all light emitting diodes, regardless of the emission wavelength, which usually is in the visible or infra- red wavelength.
  • IRED is used to mean infra-red light emitting diodes.
  • the LEDs have been arranged in the configuration of a row with small mutual spacing on a light element base; optical means by the aid of which radiation produced by the light elements is collected and the radiation is dispersed to a spectrum; and an exit aperture disposed in con ⁇ junction with the light element base and through which the desired part of the radiation spectrum is directed out from the radiation source, the light element base with its light elements, the optical means and the exit aperture being disposed in conjunction with said chassis.
  • the chassis com ⁇ prises an optics chassis and a light element chassis, these being fitted together so that they enclose with ⁇ in themselves a cavity-like space; the optical means for processing the radiation are disposed on the op ⁇ tics chassis; the light element base and the light elements are disposed on the light element chassis and the exit aperture, in conjunction therewith.
  • the radiation source of the invention is essentially composed of two separate parts: the optics chassis and the light element chassis. At the stage when the radiation source is being manufactured, these are fitted together in that the radiation source is tuned to produce and send out through the exit aper ⁇ ture such radiation which contains wavelength bands, usually narrow ones, of desired mean wavelength and radiation half-value width, these bands being selected by activating each light element in turn.
  • the construction of the radiation source of the invention is such that its tuning measures can be implemented rapidly and reliably as it is being manu ⁇ factured.
  • the optics chassis and light element chassis are fitted together so that the distance between them is adjustable in the direction of the axis of the radiation source, and so that substantially every radiation spectrum implemented by means of the light elements will be projected to form an image in the plane of the exit aperture.
  • the position of the light element chassis, and in particular that of the exit aperture is adjustable, at least in the plane of the exit aperture, so that of substantially every light element the desired part of the radiation spectrum will be projected to form an image exactly at the exit aperture.
  • the optics chassis and light element chassis, and the light element base, particularly the exit aperture are permanently secured in place relative to each other.
  • the cavity may be a hermetically sealed volume containing air or any suitable protective gas or at least a partial vacuum.
  • a space like this is well per ⁇ meable to radiation and, most advantageously, contains no extra particles.
  • the light elements are disposed in a row on the light element chassis beside the exit aper ⁇ ture, at a small distance from the exit aperture.
  • the advantage with a radiation source of this type is that simple lens optics can be used, even implemented with one single lens, without incurring impaired perfor ⁇ mance of the optical arrangement owing to image form ⁇ ing errors of "off axis" type.
  • the exit aperture is disposed in a fit ⁇ ting unit, such as a sleeve, auxiliary plate, etc. mounted in conjunction with a fitting aperture dis ⁇ posed on the light element base.
  • the fitting aperture is of substantially larger size than the exit aperture in order to enable position adjustment of the fitting unit and of the exit aperture which it carries.
  • the fitting unit is movable at least in the plane perpen ⁇ dicular against the axis of the radiation source and it is securable in place on conclusion of the radia ⁇ tion source tuning adjustments.
  • Adjustment of the fitting unit's position corrects for the effect of the mounting tolerances acting in the plane at right angles to the axis of nearly all struc ⁇ tural parts: those relating to placement of the row, to placement of the light element chassis, and to cen ⁇ tering of the lens.
  • the fitting unit is secured per- manently in place on concluded adjustment.
  • the fitting unit is a sleeve-like holder in which an optic fibre can be mounted.
  • the exit aper ⁇ ture is formed on the end of the optic fibre in this instance.
  • the fitting unit is movable relative to the light element chassis and securable so that the fibre end resides at any desired location in the fitting aperture, this point being equivalent to the exit aperture.
  • the light element base is shaped of ce ⁇ ramic material or an equivalent material with stable dimensions.
  • the ceramic material is aluminium oxide, for instance.
  • the light element base is advantageously made of ceramic material of black colour, e.g. the kind of material normally used in making housings for integrated circuits.
  • Black colour prevents the radia ⁇ tion from the light elements from shining through the light element base to the other side thereof. Further- more, the black surface of the light element base attenuates the reflection from this face of the radia ⁇ tion coming from the light elements.
  • white ceramic material may be used, such as alu ⁇ minium oxide, but in suich cases the light element base is coated with a metallic film, to prevent the passage of radiation, and in addition with a dull black film, to attenuate any reflections.
  • black and “dull black” refer to the range of visible light. In the infra-red range the light ele ⁇ ment base has to be opaque to these wavelengths, and its surface has to be reflection-attenuating for these wavelengths.
  • the optical means for radiation proces ⁇ sing comprise a focussing holographic reflection grat ⁇ ing, fixedly attached to the optics chassis.
  • the optical means and the optics chassis thus form a unitary entity which is dimensioned in advance and has been manufactured to present a comparatively small and compact unit.
  • a unit of this kind is easy to manufacture. It should be noted, further, that use of a reflection grating enables the space required for the optics of the radiation source, and consequently the length of the radiation source, to be made smaller than that required in a design of similar type based on a transition grating.
  • the total wavelength range to be spanned by the radiation source is determined by selecting the groove frequency of the grating, the angle of attitude of the grating, the focal length of the optics and the structure of the row which the light elements form.
  • the half-value widths of the wavelength range to be spanned by the radiation source is determined by selection of the grating's groove frequency, its angle of attitude, the focal length of the optics and the structure of the row which the light elements form.
  • the half-value widths of the wavelength bands that are going to be produced are affected, in addition to those just men ⁇ tioned, by the size of the emitting area of the light elements, the breadth of the exit aperture measured in the direction of the spectrum, and by the image errors of the optical arrangement.
  • the optical parts of the radiation source can equally be implemented in other ways, e.g. by lens arrangement, prism and mirror.
  • the angular dispersion attainable with such arrangements is low, and therefore produc ⁇ tion of narrow enough wavelength bands implies great focal distance and, in practice, means a large-sized radiation source.
  • the light elements are LEDs.
  • LEDs are small semiconductor components which emit radiation in a comparatively narrow wavelength band, the half-value width is typically 20 to 150 nm. It is possible with a single LED type to cover a wavelength range wider than the half-value width: by utilizing the marginal ranges of the emission spectrum as well.
  • the radiation source can be dimensioned for an even wider wavelength range by using several types of LEDs in the row.
  • LEDs oper- ating at room temperature are nowadays available in the wavelength range from 470 nm to 4.7 ⁇ m.
  • the light- emitting area of a LED is small, and such diodes can be placed with close spacing to form a row; this con ⁇ tributes to enabling narrow, closely adjacent wavelength bands to be produced.
  • the row of LEDs can advantageously be produced by means of hybrid technique on a ceramic substrate.
  • the connection bases and conductor patterns for the LEDs are advantageously produced on the ceram- ic base by printing, using thich film technique.
  • the LED chips are thereafter attached by gluing with an electrically conductive cement, or by soldering, and they are contacted e.g. with gold wire bonding. This procedure enables the LED row and the exit aperture to be manufactured with re- producible dimensions on the substrate.
  • Ceramic sub ⁇ strate material keeps stable dimensions and has a low thermal expansion coefficient (about 7 ppm per °C) .
  • the advantage afforded by hybrid technique in this connection is that one is flexibly enabled to make a row to any desired specifications; it may contain any desired number of LED chips of various types, and the LED chips are freely placeable, if desired with close mutual spacing.
  • Another way to implement the LED row is to employ LEDs which have been encapsulated in standard manner by their manufacturer.
  • the row and the exit aperture can be thus produced on a ceramic substrate or e.g. on a circuit board substrate made of glass fibre lamination. Placement of the LEDs with close spacing is hampered by the size of the LED housings.
  • the third alternative is to have the manufac ⁇ turer of semiconductors make a fully encapsulated com ⁇ ponent containing the row of LEDs.
  • the LED elements are in this case implemented on an integral semicon- ductor substrate by so-called monolithic techniques. Such a component can be mounted on a separate light element base, in conjunction with which the exit aper ⁇ ture can be equally provided.
  • This type of technique affords the advantage that one has a chance to achieve a LED element size smaller than that of hybrid tech ⁇ niques, as well as closer spacing of the LEDs. With this technique, the LED elements contained in the row of LEDs are normally all of the same type.
  • the light elements can equally be implemented by assembly of other kinds of light-emitting light sources which can be in ⁇ dividually activated to operate. Such are e.g. minia- ture incandescent bulbs, which radiate in a wide spectral range.
  • an optic fibre of appropriate length is mounted in connection with each light element.
  • a design like this is implementable e.g. by using so-called LEDs with fibre tail.
  • the ad ⁇ vantage of such design is that the light elements can be freely placed in any desired location.
  • the ends of the optic fibres are mounted in a row on the light element base of the radiation source.
  • the light ele ⁇ ments are advantageously substantially similar of their dimensions, while the spectral characteristics of the radiation which they produce, i.e., the wave ⁇ lengths (or more generally the wavelength ranges) of their radiations may differ. This enables the range of adjustment of the radiation derivable from the radia ⁇ tion source to be expanded. Naturally, the light ele ⁇ ments may be identical.
  • the LEDs are provided with a transparent extra material layer, such as an epoxy or silicone layer.
  • the purpose with this extra material layer is to protect the LED from ambience and to match the co ⁇ efficient of refraction of the LED material with that of the light-transmitting space in conjunction with the chassis part, in order to minimize losses by re ⁇ flection at the boundary face.
  • the extra material layer is formed upon the bare chips, which have ben fixed and electri- cally contacted to the substrate theretofore.
  • the light element chassis comprises a plurality of aperture plates, so called baffles, which have been placed between the optical means and the light element base.
  • the purpose with the aperture plates is to absorb that part of the radiation from the light elements which is not collected with the optical means, such as a lens or a grating.
  • the light element such as a LED, is equivalent in its proper ⁇ ties to a Lambert radiator, which radiates its optical output power into a hemisphere. Only about 5 to 10% of this can be collected by means of standard lens optics, the rest of the radiation hitting the walls of the construction. If this latter radiation is not ab ⁇ sorbed or attenuated, part of it may have a chance to reach the exit aperture.
  • the aperture plates are impermeable to radiation, properly dimensioned of aperture size and shape, hav- ing dull, i.e., non-reflecting surfaces and they are radiation-absorbing in the wavelength range that is being used, at least of their surfaces (i.e., dull black in the range of visible light),
  • the aperture plates are advantageously made of black plastic.
  • the optics chassis and the light element chassis are advantageously made of metal, such as alu ⁇ minium or steel.
  • the chassis units of the radiation source should be of stable enough material suffering minimal deformations e.g. under effect of temperature. Materials that can be contemplated are, for instance, several metals, such as steel, brass or aluminium. It is understood, however, that the chassis units may equally be made of another material meeting the requirements.
  • the radiation source is simple of its construction and well-adapted to industrial manufacturing. Moreover, it is composed of structural parts which are favourably priced. It is a further advantage of the invention that, in addition to its simplicity and its convenient manufacturing, the design of the radiation source en ⁇ ables the main characteristics of the radiation source to be tuned precisely in connection with assembly.
  • the tuning takes place in two steps: the position relative to each other of the optics chassis andthe light ele ⁇ ment chassis is first adjusted so that an image of the spectrum is formed in the plane of the exit aperture, wherafter the exit aperture is properly positioned relative to the image of the spectrum. This adjustment makes it possible to turn out radiation sources with substantially similar characteristics in series pro ⁇ duction.
  • the invention also affords the advantage that it is moreover possible with the radiation source to implement an ample number of measuring wavelength bands, typically 2 to 16 bands, and which have com ⁇ paratively narrow half-value widths, typically on the order of 10 to 40 nm.
  • the optical performance of the radiation source meets the requirements imposed by many analyzers, portable instruments and colour meters as regards radiation output power and wavelength resolution.
  • a LED row established on a light element base, that is on a suitable substrate, by means of hybrid technique enables flexible designability from applica ⁇ tion to application as regards selection, number and placing of the LEDs.
  • the LEDs in one radiation source are either mutually similar or they are suitably se ⁇ lected as regards their radiation output spectrum.
  • the optical and opto- echanical construction of the radiation source can be implemented in small size.
  • the size of the radiation source may be on the order of 50 mm x 25 mm x 20 mm. This order of magnitude makes for easy application as a part in portable, and on the whole small-sized, ana ⁇ lyzers and other spectroscopic instruments.
  • Fig. 1 presents a radiation source according to the invention, in longitudinal cross section A-A;
  • Fig. 2 shows the radiation source of Fig. 1, viewed from above and partly sectioned;
  • Fig. 3 presents schematically the light element base;
  • Fig. 4a presents the auxiliary plate for attachment to the light element base, in frontal view;
  • Fig. 4b presents the sleeve-like holder for attachment to the light element base, in elevational view;
  • Fig. 5 presents schematically the optical design and operation of the radiation source;
  • Fig. 6a illustrates by way of example, the radiation spectrum of one light element
  • Fig. 6b illustrates schematically the radiation spec ⁇ trum obtained from the radiation source of the inven- tion.
  • the radiation source of Fig. 1 comprises a chassis 1 consisting of an optics chassis 8 and a light element chassis 7.
  • the optical means 3 for pro ⁇ cessing the radiation are disposed on the optics chassis 8.
  • the light element base 6 and light elements 2 are disposed on the light element chassis 7.
  • the exit aperture 4 is also disposed in conjunction with the light element base 6.
  • the optics chassis 8 and light element chassis 7 enclose within themselves a cavity-like space 5.
  • the optical means for radiation pro ⁇ cessing comprise a lens system 9 and a reflection grating 10.
  • the lens system 9 and reflection grating 10 are mounted on the optics chassis 8, on the same axis with the central axis of the cavity 14. In this embodiment the lens system 9 has been implemented with one single lens.
  • the reflection grating is disposed at an angle against the central axis B-B of the optics chassis 8.
  • the light element base 7 is a cylindrical, sleeve-like component which can be fitted into the cavity 14 of the optics chassis 6, its central axis coinciding then with the central axis B-B of the optics chassis 8.
  • the light element base 6 has been disposed on the first end of the light element chassis 7, perpendicularly against its central axis.
  • the cen ⁇ tral axis B-B may also be called the central axis of the radiation source.
  • the light elements 2 are disposed in a row beside the exit aperture 4 of the light element base 6 in such manner that the central axis B-B of the radi ⁇ ation source passes substantially perpendicularly be ⁇ tween the light elements 2 and the exit aperture 4.
  • the light element chassis 7 comprises a number of ap ⁇ erture plates 11, disposed in the cavity 17 at a dis- tance from each other.
  • the light element base 6, Fig. 3, is made of ceramic material, black in colour, e.g. of Kyocera A-445 (TM), which is 91% aluminium oxide (Al 2 0 3 ).
  • the light elements 2 are LEDs 2 1 , 2 2 , 2 3 ,..., 2 7 . They are arranged in a straight row with a small mutual spac ⁇ ing.
  • the connection bases and conductor patterns of the LEDs 2 1 , 2 , 2 ... have been produced by thick film technique on the light element base 6. In order to minimize the connection pins 18, the anode poles of all LEDs have been connected to a common conductor and connector pin 181.
  • the cathode poles are connected by means of thick film conductors to individual connector pins 182-188, whereby each LED 2 -2 7 can be individu ⁇ ally activated.
  • the LEDs 2 1 -2 7 are LED chips which have been fixed in place, using electrically conduc ⁇ tive epoxy for connecting the anode contact on the botom of each LED chip.
  • the cathode poles of the LED chips 2 1 -2 7 are connected to the respective thick film conductors by means of thin gold wires.
  • the LED chips 2 1 -2 7 may be protected with a layer of extra material which is maximally transparent in the operating wavelength band of the diodes. This has been implemented by placing a drop of epoxy or of silicone upon each LED chip.
  • the fitting aperture 13 has been made in the light element base 6 e.g. by laser machining.
  • the diameter of the fitting aperture 13 is clearly supe ⁇ rior to that of the actual exit aperture 4.
  • the actual exit aperture 4 which advantageously is shaped to be a slit transversal to the spectrum of the incident radiation, has been provided on the fitting unit, e.g. in a separate auxiliary plate 12, which can be mounted in conjunction with said fitting aperture 13.
  • the aux ⁇ iliary plate 12 is affixed, e.g. by gluing, on the smooth rear face of the light element base 6 in a suitable position in register with the fitting aper- ture 13.
  • the exit aperture can also be disposed on the fitting unit, which comprises a sleeve-like holder 22 (Fig. 4b).
  • An optic fibre 23 can be mounted in the holder 22. It is then possible to conduct the output beam of the radiation source to the object which is being measured, with the aid of the fibre 23.
  • the end 23a of the fibre corresponds to the exit aperture 4, and its position is adjusted by moving the holder 22 relative to the fitting aperture 13 of the light ele ⁇ ment base 6 into suitable position.
  • the light element base 6 is fixedly connected to the light element chassis 7. Minor alignment errors of the light element base 6 with reference to the light element chassis 7 are not detrimental because they can be corrected when the position of the auxili ⁇ ary plate 12 and exit aperture 4 is adjusted to be correct as indicated by measurement of the output beam from the radiation source.
  • the optical means 3 by the aid of which radiation produced by the light elements 2 is col ⁇ lected and this radiation dispersed to a spectrum, are fixedly mounted on the optics chassis 8.
  • the reflec ⁇ tion grating 10 and the lens system 9 are fixed in place with glue. Adequate accuracy of alignment of these optical means has been achieved by making use of fixing faces machined on the optics chassis.
  • In the cavity 14 of the optics chassis 8 has in this embodiment been provided an annular groove 15 in the region where the light element chassis is dis ⁇ posed.
  • An aperture 16 leads from outside the optics chassis into this annular groove 15. Through the aper- ture 16 glue is introduced in the annular groove 15 when the light element chassis 7 and optics chassis 8 are interlocked on concluded adjustments.
  • Figs 1 and 2 The operation of the radiation source of Figs 1 and 2 is illustrated with the aid of Figs 5, 6a and 6b. From all LED chips 2 , 2 , 2 3, ... belonging to the LED row 2, similar spectral curves of output radiation are obtained. Such a curve is schematically displayed in Fig. 6a, where the intensity I of the outgoing ra ⁇ diation has been plotted over wavelength ⁇ .
  • the radia ⁇ tion spectrum of the LED has the shape of a broad bell curve L, which has the mean wavelength ⁇ k .
  • the radiation pro ⁇ is collected and the radiation is dispersed to a spectrum and focussed on the exit slit 4 with optical means 3.
  • Fig. 5 has been illustrated the path of light rays from the LEDs 2 1 , 2 2 and 2 3 through the lens system 9 and the reflection grating 10 and further to the exit slit 4.
  • the spectra of the outgoing radiation of the radiation source are narrow wavelength bands or ranges S in Fig. 6b in the range ⁇ -
  • each one of the LEDs 2 1 , 2 2 , 2 3 ,..., 2 N is made operative, or activated, individually with the aid of a control unit 19, to which external apparatus can be appropriately connected through an I/O channel 20.
  • ⁇ N can be influenced by means of the groove frequency of the reflection grating 10, the dimensions of the LED chips and the focal distance of the lens system 9.
  • the overall wavelength range covered with the radiation source is determined by selection of the groove frequency of the reflection grating 10, the focal distance of the lens system 9 and the length of the LED row 2.
  • the aberrations of the optical means 3 can be minimized to conform to the requirements imposed by applications, by using in the lens system 9 instead of a convex lens, for instance, an aspheric glass or plastic lens, doublet or triplet optics.
  • the groove frequency of the reflection grating can be accurately controlled and set e.g. at 1200 ⁇ 1 lines/mm.
  • the chassis 1 is assembled by joining to each other the light element chassis 7 and the optics chassis 8.
  • the light element chassis 7 is at that stage attached the light element base 6, in which the fit ⁇ ting aperture 13 has been machined and on which the LEDs 2 with connecting leads and connectors have been mounted.
  • the lens system 9 and reflection grating 10 have been affixed.
  • Final assembly and tuning of the radiation source is advantageously implemented as follows.
  • the optics chassis 8 and light element chassis 7 are fitted to each other at approximately proper ad ⁇ justment distance, and the auxiliary plate 12 is dis ⁇ posed in conjunction with the light element base 6, in approximately proper position behind the fitting aperture 13 therein.
  • the radiation source is next in ⁇ serted in a tuning arrangement including micrometer- type movers both for the light element chassis 7 (or alternatively the optics chassis 8) and for the auxil ⁇ iary plate 12, for making said adjustments.
  • a spectrometer is provided for measuring the emission spectrum of the output beam.
  • One LED 2 of the radiation source is activated for the adjustment.
  • the light element chas ⁇ sis 7 is adjusted relative to the optics chassis 8 into proper position so that maximum optical power of the output beam is obtained, visible in the form of a high emission band in the spectrometer. Thereafter, the position of the exit aperture 4 is adjusted, mov ⁇ ing the auxiliary plate 12 along the rear face of the light element base 6 in the direction of the spectrum until the mean wavelength of the output beam has been brought to coincide with the desired wavelength, this being visible in the spectrometer as a shift of the mean wavelength of the emission band to coincidence with the desired wavelength. Since the two adjustments are somewhat interdependent, both adjustments are it- erated through another run at least.
  • the light element chassis 7 and optics chassis 8 are then secured in place, and also the auxiliary plate 12 to the light element base, with the aid of glue. When the glue has been cured, the completed radiation source is removed from the tuning arrangement.
  • the exit aperture 4 being fitted in this aperture with the aid of a fitting unit, such as an auxiliary plate 12 or a holder 22.
  • the light element base 6 can be implemented without auxiliary plate 12 by disposing the exit aperture 4 directly on the light element base 6.
  • tuning of the exit aper- ture 4 in the tuning arrangement, in the second ad ⁇ justment procedure, is effected by moving the entire light element base 6 at right angles to the central axis in the light element chassis 7.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

L'objet de cette invention est une source de rayonnement comprenant un cadre de support (1) définissant un espace (5) perméable aux rayonnements, plusieurs éléments lumineux, tels que des diodes électroluminescentes (2) disposées en rangées et avec des espacements mutuels étroits, sur une base (6); des dispositifs optiques (3) au moyen desquels le rayonnement produit par lesdits éléments lumineux est rassemblé et dispersé en un spectre; et une ouverture de sortie (4), ménagée dans la base (6) de support des éléments lumineux, et à travers laquelle la partie requise du spectre de rayonnement (Δμ1, Δμ2, Δμ3,...) est dirigée hors de la source de rayonnement. La base (6), les éléments lumineux (2), le dispositif optique (3) et l'ouverture de sortie (4) sont tous disposés dans le cadre de support (1). Selon cette invention, le cadre (1) comprend un cadre (8) pour éléments optiques et un cadre (7) pour éléments lumineux, lesquels s'adaptent l'un à l'autre de façon à enfermer un espace (5) analogue à une cavité; les dispositifs optiques (3) destinés au traitement du rayonnement sont disposés sur le cadre (8) pour éléments optiques; la base (6) et les éléments lumineux (2) sont disposés sur le cadre (7) pour éléments lumineux, et l'ouverture de sortie (4) est disposée conjointement avec ces derniers. Les éléments lumineux (2) sont disposés en rangée sur la base, à côté de l'ouverture de sortie (4). L'axe central (B-B) du cadre (8) d'éléments optiques et de la base s'étend perpendiculairement entre les éléments lumineux et l'ouverture de sortie. Cette dernière (4) est située dans un élément de montage, tel qu'une plaque auxiliaire (12) montée dans une ouverture de montage (13) de la base.
PCT/FI1992/000359 1991-06-28 1992-12-23 Source de rayonnement WO1994015183A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FI913181A FI89631C (fi) 1991-06-28 1991-06-28 Straolkaella och excitationsanordning foer den
PCT/FI1992/000359 WO1994015183A1 (fr) 1991-06-28 1992-12-23 Source de rayonnement
AU31609/93A AU3160993A (en) 1991-06-28 1992-12-23 Radiation source

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI913181A FI89631C (fi) 1991-06-28 1991-06-28 Straolkaella och excitationsanordning foer den
PCT/FI1992/000359 WO1994015183A1 (fr) 1991-06-28 1992-12-23 Source de rayonnement

Publications (1)

Publication Number Publication Date
WO1994015183A1 true WO1994015183A1 (fr) 1994-07-07

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998003842A1 (fr) * 1996-07-17 1998-01-29 Valtion Teknillinen Tutkimuskeskus Spectrometre
WO2015018844A1 (fr) * 2013-08-08 2015-02-12 Archimej Technology Procede de fabrication d'un emetteur de lumiere
CN106772552A (zh) * 2017-03-02 2017-05-31 中国工程物理研究院核物理与化学研究所 组合式伽玛射线辐射器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5029245A (en) * 1987-06-25 1991-07-02 Valtion Teknillinen Tutkimuskeskus Procedure for controlling a radiation source and controllable radiation source
FI89631B (fi) * 1991-06-28 1993-07-15 Valtion Teknillinen Straolkaella och excitationsanordning foer den

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5029245A (en) * 1987-06-25 1991-07-02 Valtion Teknillinen Tutkimuskeskus Procedure for controlling a radiation source and controllable radiation source
FI89631B (fi) * 1991-06-28 1993-07-15 Valtion Teknillinen Straolkaella och excitationsanordning foer den

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998003842A1 (fr) * 1996-07-17 1998-01-29 Valtion Teknillinen Tutkimuskeskus Spectrometre
WO2015018844A1 (fr) * 2013-08-08 2015-02-12 Archimej Technology Procede de fabrication d'un emetteur de lumiere
FR3009650A1 (fr) * 2013-08-08 2015-02-13 Archimej Technology Procede de fabrication d'un emetteur de lumiere
CN106772552A (zh) * 2017-03-02 2017-05-31 中国工程物理研究院核物理与化学研究所 组合式伽玛射线辐射器
CN106772552B (zh) * 2017-03-02 2023-08-04 中国工程物理研究院核物理与化学研究所 组合式伽玛射线辐射器

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