EP1763885A1 - Strahlungsoptisches bauelement - Google Patents
Strahlungsoptisches bauelementInfo
- Publication number
- EP1763885A1 EP1763885A1 EP05757025A EP05757025A EP1763885A1 EP 1763885 A1 EP1763885 A1 EP 1763885A1 EP 05757025 A EP05757025 A EP 05757025A EP 05757025 A EP05757025 A EP 05757025A EP 1763885 A1 EP1763885 A1 EP 1763885A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- radiation
- channel
- reflecting layers
- optical component
- absorbing
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
- G21K1/02—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators
Definitions
- the invention relates to a radiation-optical component for influencing radiation in relation to its wavelength spectrum and divergence critical angle ⁇ ⁇ with at least one channel of width d and length L up to a critical angle of incidence ⁇ c to the surface of the layer of radiation-reflecting layers on radiation-transmissive Substrates and radiation-absorbing layers.
- DE 102 03 591 A1 discloses a neutron-optical component arrangement with a bent channel with two super mirrors lying parallel to one another, in which the beam paths of different moderators, each of which generates, are used to achieve a wide range of applications serve a neutron sort, are merged, so that a superimposed neutron beam is created with a multi-spectrum.
- a targeted adjustment of individual wavelength ranges within the intended spec trum of a single moderator does not take place.
- the divergence limit angle ⁇ is the maximum radiation angle with which the beam can still pass unhindered through the channel.
- the collimators with radiation-absorbing inner walls are so-called “Soller collimators.” They have a triangular transmission profile (compare with prior art Figure 1) .
- the radiation with the angle of incidence 0 ° becomes best, that with the divergence In between, there is a linear dependence, but due to the triangular transmission function, only 50% of the radiation is transmitted in the interval ⁇ ⁇ , but a high radiation intensity at the sample is often required the inner walls or the entire walls of the channel are made of plastic films which are coated with a radiation-absorbing layer, the radiation is transmitted in air, or alternatively silicon substrates can be coated with a radiation-absorbing layer, and the radiation is then transmitted through the silicon.
- the object of the present invention is therefore to provide a radiation-optical component of the type described above in such a way that a maximum proportion of the test procedure on a sample of desired radiation with specifically predetermined parameter properties with respect to wavelength and divergence is transmitted and can reach the sample, without being influenced by the radiation-optical component and thus disturbed in the correlation of its characteristic parameters.
- the radiation-optical component should be as simple as possible in the construction, handling and maintenance.
- the solution according to the invention for this task is shown for the generic radiation-optical component alternatively in the main and secondary claim. Advantageous developments can be found in the dependent claims. These will be explained in more detail below in connection with the invention.
- the radiation-optical component according to the invention is based on the basic idea of influencing only that portion of the radiation which is not required on the sample.
- the required proportion on the other hand, remains unaffected and thus wavelength / angle of incidence unchanged even in its characteristic parameter correlation.
- the achieved transmission intensity is similar to that of a known collimator with a rectangular transmission profile, but without causing a half-way change in the parameter correlation.
- the radiation-optical component according to the invention thus operates in the function of a filter.
- wavelength filter If a specific wavelength range is to be transmitted, this is a "wavelength filter.” With a fixed channel structure, radiation above a given cut-off wavelength is reflected and absorbed The wavelengths below the cutoff wavelength are transmitted with different intensity (zero intensity at the cutoff wavelength, then rising) doubling the critical angle of incidence ⁇ c until the reflection takes place, the cut-off wavelength changes twice.
- a particular divergence is to be set, ie a filtering out of the radiation not required on the sample is carried out outside the divergence critical angle ⁇ ⁇
- a corresponding "angular filter” can be used
- the length and angle of incidence in the radiation around the same structural design of the radiation-optical component according to the invention is dependent on the (static or dynamic) dimensioning of the one or more parallel channels in length L and width d and the angular orientation of the radiation-reflecting layers.
- At least two radiation-reflecting layers on radiation-transmissive substrates ortho ⁇ gonal to at least one axial channel plane over the entire width d of the channel K at two tilt angles ⁇ ß ⁇ ( ⁇ + ⁇ c ) are arranged to the channel axis for the structural design in the invention. Furthermore, the inner walls of the channel arranged orthogonally to the axial channel plane are covered by a radiation-absorbing layer over the extent of the radiation-reflecting layers.
- at least two mirror-symmetrically oriented mirror systems are used, through which the incident radiation is transmitted up to an angle of incidence or a wavelength and initially reflected above it and absorbed at another location.
- each radiation-reflecting layer includes a radiation-absorbing layer corresponding to the reflection angles, which suppresses the respectively reflected radiation by absorption.
- the unwanted radiation components are filtered out in the horizontal channel plane and absorbed at the respective opposite channel wall, in an arrangement in the horizontal axial channel plane ent ⁇ accordingly in the vertical channel plane.
- a combination of two mirror-symmetrical mirror systems therefore allows the radiation to be filtered over the entire beam cross-section or in both perpendicular directions to the propagation direction of the radiation with respect to the divergence.
- a mirror system pair is sufficient for the function of the wavelength filter.
- the at least two radiation-reflecting layers on radiation-transmissive substrates there are different possibilities.
- they can be arranged one behind the other in the channel (V-shape), wherein the first mirror system according to the one side and the second mirror system to the other side inclined across the channel.
- V-shape the channel
- the first mirror system according to the one side
- the second mirror system to the other side inclined across the channel.
- this results in a relatively large length L of the channel, the lateral inner walls over the entire length L must be coated according to radiation absorbing.
- a considerably shorter construction results if the two radiation-reflecting layers are arranged on radiation-transmissive substrates in the channel in a cross-shaped manner (X-shape).
- the channel then has only the length L of an inclined mirror system and must be coated only on this length L radiation absorbing.
- an embodiment is provided in the manner of "benders", wherein one or more successive stacks of curved radiation-reflecting layers on radiation-transmissive substrates orthogonal to at least one axial channel plane over the entire width d of Channels K are arranged, wherein the two stacks have opposite angles of curvature to the channel axis, and the inner walls of the channel arranged orthogonal to the channel plane are coated with a radiation-absorbing layer parallel to and following the two stacks of curved reflecting layers
- the mode of operation and the range of applications is identical to that of the first alternative of the invention
- the relatively small length L of the Channel is identical to that of the first alternative of the invention.
- a bender is known for example from DE 198 44 300 C2 and consists of the curved beam guidance of neutrons of curved, alternately radiation-reflecting and -absorb Schlden layers.
- the radiation-reflecting elements are spatially separated from the radiation-absorbing layers. There are no radiation-absorbing layers between the curved radiation-reflecting layers. In addition, only the radiation-reflecting layers are curved along the channel axis.
- the radiation-absorbing layers are again in a first embodiment on the inner surface of the channel and thus run unconstrained.
- the radiation absorptive effective zone is divided into one or more sections, each extending over the channel cross-section, z. B. in two stacks behind the first curved stack one half of the filtered radiation and after the second, oppositely curved stack, the other half of the filtered radiation is absorbed.
- a collimator can still be provided in front of the first stack of curved radiation-reflecting layers, or the collimator between the two stacks can be dispensed with.
- the function of the radiation-optical component according to the invention in the application form as an angle filter for targeted radiation collimation is given in the proposed configurations in each case for exactly one wavelength. If the angle filter is also to be used for a different wavelength, then the distance between the radiation-absorbing layers and the tilt angle of the radiation-reflecting surfaces must be adjusted accordingly.
- the channel can be made wider or narrower, and at the same time the tilt angle of the radiation-reflecting surfaces can be changed. This is achieved when the end-points of the radiation-reflecting layers are hingedly connected to the inner walls of the channel.
- the mirror systems are then aligned angularly over the entire channel cross-section. If the angle filter is used on a spallation source or a time-of-flight instrument in which the different wavelengths arrive at different times, the channel width can be varied with the corresponding frequency. Due to the articulated fixed connection of the mirror systems with the channel wall whose angular arrangement in the channel cross section with the same frequency is varied.
- the radiation-transmissive substrates for the radiation-reflecting layers are usually made of rigid silicon or quartz. Application of the radiation-reflecting layers on metal or plastic films is likewise possible if either a self-supporting layer strength is reached or a supporting backing layer is galvanized or the films are stretched.
- the radiation-reflecting layers usually have layer thicknesses between 1 .mu.m and 50 .mu.m, the substrates between 5 .mu.m and 1000 .mu.m.
- FIG. 1 shows the state of the art, the geometry and transmission conditions in a radiation-absorbing channel
- FIG. 2 shows the geometry and transmission conditions in a radiation-reflecting channel
- FIG. 3 shows a simple arrangement of two mirror systems in FIG 4 shows the transmission behavior of the radiation-optical component
- FIG. 5 shows a first parallel arrangement of several pairs of two mirror systems in V-form
- FIG. 6 shows a second parallel arrangement of several pairs of two mirror systems in V-shape
- 7 shows a simple arrangement of two mirror systems in X-form in a radiation-optical component according to the invention
- FIG. 8 shows a parallel arrangement of several pairs of two mirror systems in X-form
- FIG. 9 shows a simple arrangement of two mirror systems in curved form in FIG 10 shows the transmission behavior of the radiation-optical component according to FIG. 9, and
- FIG. 11 shows a simple arrangement of two mirror systems in curved form with interposed absorption systems.
- radiation-absorbing channel K is generally rectangular or square and has a length L and a width d.
- ⁇ for a collimator arc tg d / L
- the channel K has radiation-absorbing layers SA, the radiation below absorb all angles.
- FIG. 1 shows the transmission diagram corresponding to the absorbing channel K (transmission intensity Tl via angle of incidence ⁇ of the radiation).
- Complete absorption takes place at the divergence limit angles ⁇ ⁇ . In between, there is a linear course, so that a total of a triangular transmission curve is ent. Outside this triangle curve, complete absorption (dashed line) occurs.
- FIG. 2 shows, in the prior art, schematically the geometry on a radiation-optical component SB with a channel K with radiation-reflecting walls (hereinafter "radiation-reflecting channel” K), which has the same geometric relationships as in the radiation-absorbing channel K.
- radiation-reflecting channel K has radiation-reflecting layers SR which reflect radiation up to a critical angle of incidence ⁇ ⁇ C.
- radiation-absorbing layers SA which absorb the radiation not reflected on the radiation-reflecting layers SR and thus transmitted.
- the associated transmission diagram (transmission intensity Tl over angle of incidence ⁇ of the radiation) is shown in FIG. 2 below.
- Tl over angle of incidence ⁇ of the radiation transmission intensity Tl over angle of incidence ⁇ of the radiation
- FIG. 2 transmission intensity Tl over angle of incidence ⁇ of the radiation
- a rectangular transmission profile results.
- the radiation is completely reflected and, compared with the triangular profile of the absorbing channel according to FIG. 1, transmits a maximum of twice the intensity of radiation below. However, only half is transmitted uninfluenced.
- a radiation-reflecting layer SRi, SR 2 on a strahlungs ⁇ permeable substrate SSi, SS 2 forms a mirror system SPi, SP 2 , both mirror systems SP-i, SP 2 form a pair Pj.
- the two radiation-reflecting layers SR-i, SR 2 are arranged one behind the other in a V-shape relative to one another. They each connect to the inner wall IW of the channel K at the tilt angle + ß.
- Not shown in FIG. 3 is a possible arrangement of two pairs Pj oriented orthogonally to one another, so that in both orthogonal axial channel planes KE a complete influencing of the incident radiation can take place.
- the transmission diagram (transmission intensity Tl via angle of incidence ⁇ of the radiation) for the radiation-optical component SB according to the invention is shown in FIG.
- the rectangular transmission Behavior of the radiation-optical component SB according to the invention can be seen. It can be clearly seen that the rectangular transmission region for the radiation-optical component SB according to the invention is limited only slightly by the triangular transmission. The undisturbed proportion increases with the ratio ⁇ / ⁇ .
- the regions outside the triangle are mirrored at the vertical intensity axis, which corresponds to influencing the parameter correlation wavelength / divergence in the reflected radiation.
- the additions remain correct in the lateral direction, which corresponds to a non-influencing of the transmitted radiation with increased transmission intensity.
- FIG. 5 schematically shows a first possibility of the parallel arrangement of a plurality of pairs P, each consisting of two mirror systems SP-i, SP 2 , with which the length L of the channel K required for the absorption can be shortened accordingly.
- Inverse proportionality applies: half length L for two pairs Pj, third length L for three pairs Pj, quarter length L for four pairs Pj etc.
- a radiation-absorbing intermediate layer SAZ-i, SAZ 2 is arranged in each case
- FIG. 6 shows another possibility in which every other pair Pi is rotated through 180 ° so that always two pairs Pi with the tilting tips face one another. The effect is identical, there are optionally manufacturing advantages.
- FIG. 7 shows a construction analogous to FIG. 3, with the difference that the two radiation-reflecting layers SR-i, SR 2 are arranged in the channel K on radiation-permeable substrates SS-i, SS 2 .
- the transmission diagram is identical to the transmission diagram according to FIG Figure 4, since the active principle is identical. It shows only been in the simple embodiment, a halving of the length L compared with the arrangement in V-shape according to figure 3.
- FIG. 1 An alternative embodiment of the radiation-optical component SB according to the invention is shown in plan view in FIG.
- two successive stacks ST-i, ST 2 of curved radiation-reflecting layers GSRh, GSR 2 are arranged on curved radiation-transmissive substrates GSSi, GSS 2 in the manner of a Bender orthogonal to an axial channel plane KE over the entire width d of the channel K.
- the two stacks STi, ST 2 have opposite angles of curvature to the channel axis KA.
- the inner walls IW of the channel K arranged orthogonally to the axial channel plane KE are coated with a radiation-absorbing layer SA after the two stacks ST-i, ST 2 of curved radiation-reflecting layers GSR-i, GSR 2 .
- the advantage here is the relatively short length of the two stacks ST-i, ST 2 and the continuous suppression of unwanted angles of incidence ⁇ .
- the associated transmission diagram (transmission intensity Tl via angle of incidence ⁇ of the radiation) is shown in FIG. It basically shows the same course as the transmission diagram according to FIG. 4 (thick curve). Evident is the continuous suppression of the unwanted angle of incidence ⁇ > ⁇ .
- FIG. 11 shows an alternative embodiment to FIG. 9, in which behind each stack ST 1 , ST 2 of curved radiation-reflecting layers GSR- I , GSR 2 on curved radiation-transmissive substrates GSSi, GSS 2 stacks USTi, UST 2 of non-curved radiation-absorbing intermediate layers SAZi, SAZ 2 are arranged orthogonal to the channel plane KE over the entire width d of the channel K.
- a further shortening of the channel K is advantageous, since the inner walls IW of the channel K arranged orthogonal to the channel plane KE are then connected by curved radiation-reflecting layers GSRi, GSR 2 following the two stacks ST-i, ST 2 not covered with a radiation-absorbing layer.
- the associated transmission diagram again corresponds to that shown in FIG.
- the embodiments shown relate to the function of the radiation-optical component according to the invention as an angle filter for divergence limitation of radiation. It was already mentioned at the outset that due to the direct relationship between wavelength and angle of incidence of the radiation, it is also readily possible to use it as a wavelength filter. Accordingly, in the transmission diagrams, the transmission intensity Tl is to be applied over the wavelength ⁇ . This results in transmission profiles that run only in the first quadrant and follow a more complicated than a linear distribution. LIST OF REFERENCE NUMBERS
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Optical Elements Other Than Lenses (AREA)
- Optical Couplings Of Light Guides (AREA)
- Optical Filters (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004031934A DE102004031934B4 (de) | 2004-06-27 | 2004-06-27 | Strahlungsoptisches Bauelement |
PCT/DE2005/001111 WO2006000195A1 (de) | 2004-06-27 | 2005-06-15 | Strahlungsoptisches bauelement |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1763885A1 true EP1763885A1 (de) | 2007-03-21 |
EP1763885B1 EP1763885B1 (de) | 2012-04-18 |
Family
ID=35058665
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05757025A Not-in-force EP1763885B1 (de) | 2004-06-27 | 2005-06-15 | Strahlungsoptisches bauelement |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1763885B1 (de) |
AT (1) | ATE554485T1 (de) |
DE (1) | DE102004031934B4 (de) |
WO (1) | WO2006000195A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008052410B4 (de) * | 2008-10-21 | 2010-10-07 | Helmholtz-Zentrum Berlin Für Materialien Und Energie Gmbh | Strahlungsoptisches Bauelement zur Beeinflussung von Strahlung in Bezug auf deren Wellenlängenspektrum |
DE102008064101B3 (de) * | 2008-12-19 | 2010-08-26 | Helmholtz-Zentrum Berlin Für Materialien Und Energie Gmbh | Anordnung zur Polarisation eines Neutronenstrahls mit hoher Divergenz |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1480923A (de) * | 1965-05-24 | 1967-08-09 | ||
GB1536497A (en) * | 1975-03-17 | 1978-12-20 | Galileo Electro Optics Corp | X and gamma radiation collimator and method of manufacturing such collimator |
GB2034148B (en) * | 1978-08-30 | 1983-06-15 | Gen Electric | Multi element high resolution scintillator structure |
DE3303572A1 (de) | 1983-02-03 | 1984-08-16 | Reaktorwartungsdienst und Apparatebau GmbH, 5170 Jülich | Einrichtung zum ausblenden oder stoppen eines teilchenstrahls |
DE19844300C2 (de) * | 1998-09-17 | 2002-07-18 | Hahn Meitner Inst Berlin Gmbh | Neutronenoptisches Bauelement |
DE19936898C1 (de) * | 1999-07-29 | 2001-02-15 | Hahn Meitner Inst Berlin Gmbh | Neutronenpolarisator |
DE10203591B4 (de) * | 2002-01-23 | 2008-09-18 | Helmholtz-Zentrum Berlin Für Materialien Und Energie Gmbh | Neutronenoptische Bauelementanordnung zur gezielten spektralen Gestaltung von Neutronenstrahlen oder -pulsen |
-
2004
- 2004-06-27 DE DE102004031934A patent/DE102004031934B4/de not_active Expired - Fee Related
-
2005
- 2005-06-15 AT AT05757025T patent/ATE554485T1/de active
- 2005-06-15 WO PCT/DE2005/001111 patent/WO2006000195A1/de active Application Filing
- 2005-06-15 EP EP05757025A patent/EP1763885B1/de not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2006000195A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE554485T1 (de) | 2012-05-15 |
DE102004031934B4 (de) | 2006-11-09 |
WO2006000195A8 (de) | 2006-03-09 |
DE102004031934A1 (de) | 2006-01-19 |
WO2006000195A1 (de) | 2006-01-05 |
EP1763885B1 (de) | 2012-04-18 |
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