CN205145403U - A vane of multi -vane collimator structure for optical fiber positioning - Google Patents
A vane of multi -vane collimator structure for optical fiber positioning Download PDFInfo
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- CN205145403U CN205145403U CN201520850800.2U CN201520850800U CN205145403U CN 205145403 U CN205145403 U CN 205145403U CN 201520850800 U CN201520850800 U CN 201520850800U CN 205145403 U CN205145403 U CN 205145403U
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Abstract
The utility model discloses a vane of multi -vane collimator structure for optical fiber positioning, every blade upper surface of multi -leaf collimator all is equipped with the inclined plane that length has contained whole blade length, all being equipped with a signal acquisition optic fibre on every blade, following the direction wiring that is on a parallel with blade length, be close to the vertical alignment blade of the fiber end face surface of blade head position, when the blade moved, this signal acquisition optic fibre formed the F -P resonant cavity with the horizontal relative movement of blade emergence, fiber end face with the surface on inclined plane. The utility model discloses a blade positioning of high accuracy to positioner long -term stability and reliability's under the radiation environment operation has been guaranteed.
Description
Technical field
This utility model relates to blade locking device, particularly relates to a kind of multi-diaphragm collimator blade construction for fiber orientation.
Background technology
In accurate radiotherapy, need as far as possible accurately to form the irradiation field consistent with target region shape on the projecting direction of target area, therefore have higher requirement to the accuracy of irradiation field shape.
Multi-diaphragm collimator is used to the mechanical moving element producing conformal radiation field size, is commonly called as multi-leaf optical grating, multi-leaf collimator etc., is widely used in medical domain, and multi-diaphragm collimator is the main equipment realizing accurate radiotherapy launched field shape at present.The levels of precision of multi-diaphragm collimator blade movement position directly affects the accuracy of irradiation field shape.
Capacitance plate formula is mainly adopted to feed back or magnetic grid reaction type to the location of multi-diaphragm collimator in prior art, but contact positioner can raw relative movement concurrent with blade contact, easily cause the wearing and tearing of device, therefore the service life of contact positioner is short, reliability of positioning is also poor.Contactless main employing ruby coordinates CCD camera locate mode, and this cordless is in radiation environment for a long time due to CCD camera, and CCD chip easily lost efficacy, and needed often to change CCD camera.
Utility model content
The technical problems to be solved in the utility model is the defect that service life is short, reliability of positioning is also poor for contact positioner in prior art, and the contactless CCD chip that needs easily lost efficacy, need the defect often changing CCD camera, a kind of optical fiber multi-diaphragm collimator blade locking device based on inclined-plane is provided.
This utility model solves the technical scheme that its technical problem adopts:
A kind of each blade upper surface of multi-diaphragm collimator is provided to be equipped with the inclined-plane that length contains whole length of blade; Each blade is equipped with a signals collecting optical fiber, along the direction wiring being parallel to length of blade, fiber end face near leaf head position vertically aims at blade surface, when the blade is in motion, there is horizontal relative movement in this signals collecting optical fiber and blade, the surface on fiber end face and inclined-plane forms F-P resonant cavity.
In multi-diaphragm collimator blade construction described in the utility model, described signals collecting optical fiber is attached to the position that former multi-diaphragm collimator installs capacitance plate.
In multi-diaphragm collimator blade construction described in the utility model, the gap between fiber end face and blade upper surface is 0.01-0.5mm.
In multi-diaphragm collimator blade construction described in the utility model, described signals collecting optical fiber is radiation-resistant fiber.
In multi-diaphragm collimator blade construction described in the utility model, the gradient on described inclined-plane is 0-20 °.
In multi-diaphragm collimator blade construction described in the utility model, described inclined-plane and blade are structure as a whole.
The beneficial effect that this utility model produces is: this utility model is positioned by the blade of contactless blade locking device to multi-diaphragm collimator, thus avoids the wearing and tearing of device.By arranging the inclined-plane that length comprises whole length of blade at blade surface, the fiber end face of single signals collecting optical fiber vertically aims at blade surface, horizontal relative movement is there is with blade, form F-P resonant cavity, the end face of optical fiber and the distance on inclined-plane can changes gradually, and corresponding change can occur the resonant frequency of resonator cavity, when the two distance is near, resonant frequency is low, and when distance, resonant frequency is high.Collect interference signal by optical fiber, then processed by signal processing circuit, obtain frequency information by Fourier transformation, just can obtain the positional information of blade.Thus achieve high-precision blade location, and ensure that the operation of positioner long time stability under radiation environment.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is the partial structurtes schematic diagram that this utility model embodiment signals collecting optical fiber is arranged on multi-diaphragm collimator;
Fig. 2 is the spectral information that this utility model examples measure obtains diverse location;
Fig. 3 is the different spectral frequency that this utility model embodiment diverse location is corresponding.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, this utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain this utility model, and be not used in restriction this utility model.
This utility model is based on the optical fiber multi-diaphragm collimator blade locking device on inclined-plane, and as shown in Figure 1, the upper surface of each blade 1 of multi-diaphragm collimator is equipped with the inclined-plane 3 that length contains whole length of blade; Each blade surface is also provided with a signals collecting optical fiber 2, optical fiber 2 is along the direction wiring being parallel to length of blade, fiber end face near leaf head position vertically aims at blade surface, and with blade 1, horizontal relative movement occurs, and the surface on fiber end face and inclined-plane 3 forms F-P resonant cavity.Inclined-plane 3 and blade 1 can be structure as a whole.
Optical fiber vertically aims at blade surface, and when there is horizontal relative movement with blade, and the end face of optical fiber and the distance on inclined-plane can changes gradually.Now, can there is corresponding change to the resonant frequency of the F-P resonant cavity that the surface on inclined-plane is formed in fiber end face, and when the two distance is near, resonant frequency is low, and when distance, resonant frequency is high.As shown in Figure 2, collect interference signal by optical fiber, obtain the spectral information of diverse location.As shown in Figure 3, obtain frequency information by Fourier transformation, due to the spectral frequency that diverse location is corresponding different, just can obtain the positional information of blade.
The light source of input optical fibre can adopt white light source, arrives inclined-plane after light source incidence through bonder.After forming f-P resonance between profile of optic fibre and inclined-plane, the light of different-waveband forms different pole maximum and minimums.Interval between the maximum and minimum of pole is relevant to the distance L of F-P resonant cavity, has this relation following,
FSR＝λ/2nL
Wherein n is air refraction, and λ is wavelength.FSR can be drawn by the spectral signal exported.
Spectral signal can obtain the frequency information of spectrum by Fourier transformation, thus obtains the one-to-one relationship of spectral frequency and F-P resonant cavity spacing L, and then obtains the corresponding relation of spectral frequency and blade position.That is, as long as obtain spectral frequency, just leaf position is obtained.Compare and obtain blade amount of movement by counting, thus determine the method for leaf position, method of the present utility model is more direct, and without the need to judging the advance and retreat direction of blade.In theory, can reach higher certainty of measurement by measuring method of the present utility model, generally only be limited to the spectral resolution of spectral detector, positioning precision can to tens micron dimensions.
Emergent light is after blade surface reflection, and get back to the position of fiber end face, part light is collected by optical fiber, is transferred to follow-up system as reflected signal.The capacity gauge of optical fiber to reflected light is determined by the numerical aperture of optical fiber (NA).That is, only in fiber core scope, the luminous energy that angle of incidence is less than 8 degree is collected by optical fiber.Therefore, in fact within the scope of the hot spot of 0.028mm diameter, the hot spot only having the diameter of central authorities to be less than 10.5^111 can be reflected to optical fiber thus be collected, and therefore the gradient on inclined-plane is arranged in the scope of 0-20 ° by this utility model, and optical fiber can be made to collect the intensity signal of needs.
For the impact that the radiation environment of the gamma ray residing for blade may cause optical fibre device; on the one hand original capacitance plate is made the material of anti-radiation protection; choose radiation-resistant fiber as Transmission Fibers, to reduce the impact of radiation on fiber transmission attenuation on the other hand.
At present, grow the companies such as (Y 〇 FC) that flies and all there is ripe radiation-resistant fiber product.The radioprotective single-mode fiber of such as Chang Fei company, according to TIA/EIA455-64 standard testing, it is at accumulated dose 50krad, and close rate is under the continuous impulse irradiation of 0.1rad/s, is less than 3dB/km at the added losses of 1310nm window.Such optical fiber, for medical gamma radiation environment, adds corresponding anti-radiation protection, can ensure the running of signal transmission through fiber long-term stability.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to this utility model claims.
Claims (6)
1. for a multi-diaphragm collimator blade construction for fiber orientation, it is characterized in that, each blade upper surface of multi-diaphragm collimator is equipped with the inclined-plane that length contains whole length of blade; Each blade is equipped with a signals collecting optical fiber, along the direction wiring being parallel to length of blade, fiber end face near leaf head position vertically aims at blade surface, when the blade is in motion, there is horizontal relative movement in this signals collecting optical fiber and blade, the surface on fiber end face and inclined-plane forms F-P resonant cavity.
2. multi-diaphragm collimator blade construction according to claim 1, is characterized in that, described signals collecting optical fiber is attached to the position that former multi-diaphragm collimator installs capacitance plate.
3. multi-diaphragm collimator blade construction according to claim 1, is characterized in that, the gap between fiber end face and blade upper surface is 0.01-0.5mm.
4. multi-diaphragm collimator blade construction according to claim 1, is characterized in that, described signals collecting optical fiber is radiation-resistant fiber.
5. multi-diaphragm collimator blade construction according to claim 1, is characterized in that, the gradient on described inclined-plane is 0-20 °.
6. multi-diaphragm collimator blade construction according to claim 1, is characterized in that, described inclined-plane and blade are structure as a whole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520850800.2U CN205145403U (en) | 2015-10-29 | 2015-10-29 | A vane of multi -vane collimator structure for optical fiber positioning |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520850800.2U CN205145403U (en) | 2015-10-29 | 2015-10-29 | A vane of multi -vane collimator structure for optical fiber positioning |
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| CN205145403U true CN205145403U (en) | 2016-04-13 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106017331A (en) * | 2016-06-27 | 2016-10-12 | 深圳市奥沃医学新技术发展有限公司 | Fiber detection head mounting structure, fiber detection equipment and multi-leaf collimator system |
| CN106886153A (en) * | 2017-04-24 | 2017-06-23 | 兰州交通大学 | A kind of control method cooperated based on cross-linked multi-diaphragm collimator blade |
| WO2021007707A1 (en) * | 2019-07-12 | 2021-01-21 | Shanghai United Imaging Healthcare Co., Ltd. | Multi-leaf collimator |
-
2015
- 2015-10-29 CN CN201520850800.2U patent/CN205145403U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106017331A (en) * | 2016-06-27 | 2016-10-12 | 深圳市奥沃医学新技术发展有限公司 | Fiber detection head mounting structure, fiber detection equipment and multi-leaf collimator system |
| CN106017331B (en) * | 2016-06-27 | 2019-04-19 | 深圳市奥沃医学新技术发展有限公司 | Fiber laser arrays head mounting structure, optical fiber measurement equipments and multi-diaphragm collimator system |
| CN106886153A (en) * | 2017-04-24 | 2017-06-23 | 兰州交通大学 | A kind of control method cooperated based on cross-linked multi-diaphragm collimator blade |
| WO2021007707A1 (en) * | 2019-07-12 | 2021-01-21 | Shanghai United Imaging Healthcare Co., Ltd. | Multi-leaf collimator |
| CN112543663A (en) * | 2019-07-12 | 2021-03-23 | 上海联影医疗科技股份有限公司 | Multi-blade collimator |
| US11497936B2 (en) | 2019-07-12 | 2022-11-15 | Shanghai United Imaging Healthcare Co., Ltd. | Multi-leaf collimator |
| CN112543663B (en) * | 2019-07-12 | 2022-11-25 | 上海联影医疗科技股份有限公司 | Multi-blade collimator |
| US11771922B2 (en) | 2019-07-12 | 2023-10-03 | Shanghai United Imaging Healthcare Co., Ltd. | Multi-leaf collimator |
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