CN103594913B - The magnetic confinement device of HeNe laser pack and method - Google Patents
The magnetic confinement device of HeNe laser pack and method Download PDFInfo
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- CN103594913B CN103594913B CN201310540639.4A CN201310540639A CN103594913B CN 103594913 B CN103594913 B CN 103594913B CN 201310540639 A CN201310540639 A CN 201310540639A CN 103594913 B CN103594913 B CN 103594913B
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Abstract
The magnetic confinement device of a kind of HeNe laser pack of the present invention and method, relate to laser measuring technique field.This device comprises successively: for settling the four-dimensional movement platform (101) of HeNe laser (102), for making the magnetic confinement device of laser pack, the hot spot dimension transducer (109) for detection laser pack performance; Above-mentioned magnetic confinement device mainly comprises can the mutual exclusion magnetic confinement body (108) of High Rotation Speed, this mutual exclusion magnetic confinement body (108) is made up of multipair opposite polarity magnet, middle formation magnetic cavity (107), the laser beam that HeNe laser (102) sends can pass this magnetic cavity (107).When laser is through magnetic cavity, because laser, in mutual exclusion magnetic field, light deflection occurs, make the peripheral light of laser beam toward off-centring, thus realize the object of laser pack performance raising.
Description
Technical field
The present invention relates to technical field of laser detection, in particular, be that one utilizes mutual exclusion magnetic confinement body to improve HeNe laser pack performance, thus improve magnetic confinement device and the method for laser alignment, the precision of test and a kind of HeNe laser pack of range.
Background technology
Light is under magnetic fields, and optical characteristics will change, and the research of forefathers comprises Zeemen effect, Faraday magnetooptical effect, Cotton-Mouton effet and Kerr magnetooptical effect etc.These effects all originate from the magnetization of material, reflect contacting between light and changing of magnetism.
When MichaelFaraday finds that linearly polarized light is propagated in media as well, if add a high-intensity magnetic field on the direction of propagation being parallel to light, then optical vibration direction will deflect, deflection angle ψ, the product passing through the length L of medium to magnetic induction density B and light is directly proportional, i.e. ψ=VBL.Yawing moment depends on medium character and magnetic direction, and this phenomenon is called magnetic rotation effect.This effect can be used to analyze hydrocarbon, because often kind of hydrocarbon has respective magnetic rotation characteristic; Can be used to isolate reverberation in laser technology, also can be used as the means of modulated light wave.
When Aim é Cotton and HenriMouton finds that light is propagated in transparent liquid medium, if adding an external magnetic field perpendicular on the direction of propagation of light, then media table reveals the character of uniaxial crystal, optical axis is along magnetic direction, the difference of principal refractive index be proportional to magnetic flux density square, this effect is called magnetic double refraction.
KerrJohn finds that incident linearly polarized light is at magnetized material surface reflex time, and the phenomenon that vibration plane rotates, be called Magneto-OpticKerrEffect (MOKE).MOKE split pole to, vertical and horizontal three types, respectively the magnetization of tie substance vertical with reflecting surface, with surperficial parallel with the plane of incidence, parallel with surface and three kind situations vertical with the plane of incidence.Pole is all proportional to the magnetization to the magnetic rotation with longitudinal Kerr magneto optical effect, general pole to effect the strongest, longitudinally take second place, horizontal then without obvious magnetic rotation.Different magnetic domains has different spontaneous magnetization directions, causes the different rotary of reverberation vibration plane, when observing reverberation by polarizer, will observe the different region of the light and shade corresponding from each magnetic domain.
These researchs above all describe the phenomenon that laser produces deflection in magnetic field.But the method and apparatus of the pack that deflects for laser under mutual exclusion magnetic fields, does not up to the present also have correlative study and report.
The low-power HeNe infrared laser adopted in laser measurement process, comprise laser interferometer, laser tracker, theodolite etc., this quasi-instrument advantage is the measurement of large scale scope, especially in the field such as transporation by plane, warship of large scale.Up to the present, the application of laser in these fields widely, but, for laser alignment and the measurement of super-large dimension, a very high precision be reached, very difficult.This is because laser beam has the angle of divergence, after the stroke of super large distance, laser is dispersed very serious, cannot realize high precision test.At present, laser beam divergence the most accurate both at home and abroad reaches 0.1mrad, i.e. the length collimation of 80 meters, and spot diameter is about 8mm, and precision cannot satisfy the demands, and energy density does not reach instructions for use yet.
Therefore, the present invention proposes mutual exclusion magnetically confined laser pack method and apparatus, by changing the angle of divergence of Emission Lasers, impelling laser to carry out pack, realizing over distance laser transmission and Precision measurement.For the technical field that China's laser alignment is relevant to measurement, comprise shipbuilding, Aero-Space assembling etc. and bring huge economic benefit and technical support.
Summary of the invention
The object of the invention is, provides a kind of magnetic confinement method and device of HeNe laser pack, realizes the object improved laser pack performance.
A magnetic confinement device for HeNe laser pack, is characterized in that: comprise successively: for settling the four-dimensional movement platform of HeNe laser, for making the magnetic confinement device of laser pack, the hot spot dimension transducer for detection laser pack performance; Above-mentioned magnetic confinement device comprises precise guide rail, the support of bearing be installed in precise guide rail, the horizontal bearing be installed in the support of bearing; Also comprise the obligatory point runing rest be installed in horizontal bearing, obligatory point runing rest is hollow shaft structure, setting-in mutual exclusion magnetic confinement body is gone back in this hollow shaft structure, this mutual exclusion magnetic confinement body is made up of multipair opposite polarity magnet, middle formation magnetic cavity, the laser beam that HeNe laser sends can pass this magnetic cavity; Also comprise the rotary drive mechanism be connected with obligatory point runing rest one end.
The method of the magnetic confinement device of described HeNe laser pack, it is characterized in that comprising following process: when the laser that HeNe laser sends is through the magnetic cavity formed by mutual exclusion magnetic confinement body, because there is light deflection in laser in mutual exclusion magnetic field, make the peripheral light of laser beam toward off-centring, thus realize the object of laser pack performance raising; And the raising of laser pack performance can be judged by spot diameter, the size of spot diameter can be detected by hot spot dimension transducer; The change of laser pack performance is changed by the size of magnetic field intensity in adjustment magnetic cavity, and the size of magnetic cavity magnetic field intensity and magnetic cavity diameter, magnetic cavity length are relevant.Magnetic field intensity increases, and magnetic cavity diameter diminishes, and pack performance improves.On the contrary, magnetic field intensity reduces, and magnetic cavity diameter becomes large, and pack performance reduces.
Because laser beam has the angle of divergence, after the stroke of super large distance, laser is dispersed very serious, cannot realize high precision test.For this problem, the present invention proposes a kind of magnetic confinement method and device of HeNe laser pack, utilize the strong mutual exclusion magnetic field of N-N/S-S, act on laser beam, pack compression is carried out to laser beam, realize the deflection of epitaxial laser beam divergence angle.Utilize strong permanent magnetic mutual exclusion field and adjustable intensity electromagnetism mutual exclusion field, changing the magnetic signature parameters such as magnetic cavity internal diameter, number of pole, magnetic cavity length, take laser spot diameter as index parameter, realizes the detection that laser bunching characteristic changes.And propose isotropic rotation mutual exclusion magnetic field, avoid anisotropy field on the impact of laser pack performance, set up the method and system device of a set of magnetic confinement laser height bunching characteristic.Research and development for fields such as China's laser measurement, Aero-Space, shipbuildings is provided key theory and support technology by the present invention.Pass through laser in order to ensure magnetic confinement physical efficiency in the present invention, magnetic confinement body runing rest is designed to hollow shaft, and laser can pass from hollow shaft.When laser beam passes from magnetic cavity, should guarantee that laser beam through the center, head and the tail hole of magnetic cavity, therefore by the pose of four-dimensional movement platform adjustment laser beam, can realize the center of laser beam through magnetic cavity.Position between adjustment mutual exclusion magnetic confinement body and HeNe laser, finds most suitable distance of laser beam being carried out to pack.The support of bearing is in precise guide rail, and the linearity of guide rail requires very high, when guaranteeing that mutual exclusion magnetic confinement body axially moves on guide rail, does not affect laser pack performance.The raising of laser pack performance is detected by hot spot dimension transducer, and hot spot dimension transducer is also arranged on precise guide rail axis, guarantees that laser beats the center at transducer substantially.
Described mutual exclusion magnetic confinement body is permanent magnet form or electromagnet form.When described mutual exclusion magnetic confinement body is permanent magnet form, the change of magnetic cavity length is realized by the adjustment of permanent magnet axial length; The change of magnetic cavity diameter is realized by the adjustment of pole pair spacing each in mutual exclusion magnetic confinement body, and pole pair spacing reduces, and magnetic cavity reduces, and magnetic field intensity increases, otherwise pole pair spacing increases, and magnetic cavity increases, and magnetic field intensity reduces.When described mutual exclusion magnetic confinement body is for being formed for electromagnet, the change of magnetic cavity length is realized by the multiple electromagnet of axial series, and the electromagnet quantity of series connection increases, then magnetic cavity length increases; The change of magnetic cavity diameter is realized by the adjustment of electromagnet coils size of current, and electric current increases, and magnetic cavity diameter reduces, and electric current reduces, and magnetic cavity diameter increases.
Accompanying drawing explanation
Fig. 1 is magnetic confinement body bunching system structure chart of the present invention;
Label title in Fig. 1: 101-four-dimensional movement platform; 102-HeNe laser; 103-precise guide rail; 104-support of bearing; 105-horizontal bearing; 106-obligatory point runing rest; 107-magnetic cavity; 108-mutual exclusion permanent magnet; 109-hot spot dimension transducer; 110-driven pulley; 111-driving belt; 112-motor; 113-driving pulley.
Embodiment
Below in conjunction with accompanying drawing, the magnetic confinement method of a kind of HeNe laser of the present invention pack and device are described.
As shown in Figure 1, the magnetic confinement method of HeNe laser pack of the present invention and device comprise:
Four-dimensional movement platform 101, laser is installed on the platform, realizes the control and regulation of laser pose, guarantees that laser beam passes in magnetic cavity center;
HeNe laser 102, launches the device of HeNe low power laser;
Precise guide rail 103, the position between adjustment mutual exclusion magnetic confinement body and HeNe laser, finds most suitable distance of laser beam being carried out to pack;
The support of bearing 104, block bearing, is connected in precise guide rail simultaneously, guarantees bearing energy High Rotation Speed;
Horizontal bearing 105, hollow shaft clamping magnetic confinement body is arranged on bearing, guarantees the High Rotation Speed of magnetic confinement body, provides isotropic magnetic field;
Obligatory point runing rest (hollow shaft) 106, gets up the magnetic confinement body clamping that permanent magnet and electromagnet are formed, can realize the adjustment of pole pair distance, can be assemblied on bearing and rotate electromagnet; The centre bore of hollow shaft center hole and magnetic cavity is guaranteed coaxially as far as possible;
Magnetic cavity 107, the cylindrical magnetic field areas formed by permanent magnet or electromagnet, running parameter comprises magnetic cavity diameter, magnetic cavity length two parameters;
Mutual exclusion magnetic confinement body 108, the mutual exclusion magnetic confinement body be made up of N-N or S-S, forms deflecting effect to laser;
Hot spot dimension transducer 109, is arranged in precise guide rail, and for the diameter of detection laser hot spot before and after pack, thus reflection magnetic confinement body is to the change of hot spot pack performance;
Driven pulley 110, with hollow shaft interference fit, realizes the rotation of magnetic confinement body, provides isotropic magnetic cavity together with driving belt;
Driving belt 111: connect belt wheel and motor driving wheel, forms V belt translation chain;
Motor 112: the power source that magnetic confinement body rotates is provided;
Driving pulley 113, connects motor and driving belt, the rotary motion transmission of motor to driven pulley, realizes the rotation of magnetic confinement body.
As shown in Figure 1, in testing process, magnetic confinement method and the device performing step of HeNe laser pack are as follows:
Step 1: to electromagnet adjustment magnetic confinement body distance, to permanent magnet adjustment coil current size, form the magnetic cavity under some diameters, length;
Step 2: under four-dimensional movement platform action, adjustment laser pose, under the assistance of PSD transducer, utilizes computer control algorithm, realizes laser simultaneously through the center, head and the tail hole of magnetic cavity;
Step 3: in precise guide rail, the position between adjustment mutual exclusion magnetic confinement body and HeNe laser, finds most suitable distance of laser beam being carried out to pack;
Step 4: utilize hot spot dimension transducer to detect spot diameter size, reflect laser pack performance with this, before and after applying magnetic confinement, measures hot spot scale size respectively, compares the hot spot yardstick before and after laser pack;
Step 5: the active driving wheel being connected driven pulley on magnetic confinement body and motor by driving belt;
Step 6: electric rotating machine, produces isotropic magnetic field, when observing isotropism magnetic field (motor rotation) and anisotropy field (motor stopping), and the raising of laser pack performance.
Step 7: utilize device of the present invention, to any measurement laser, or collimation laser applies an isotropic magnetic confinement body, improves the pack performance of laser, realizes laser extra long distance precision measurement function.
Claims (6)
1. a magnetic confinement device for HeNe laser pack, is characterized in that:
Comprise successively: for settling the four-dimensional movement platform (101) of HeNe laser (102), for making the magnetic confinement device of laser pack, the hot spot dimension transducer (109) for detection laser pack performance;
Above-mentioned magnetic confinement device comprises precise guide rail (103), the support of bearing (104) be installed in precise guide rail (103), the horizontal bearing (105) be installed in the support of bearing (104); Also comprise the obligatory point runing rest (106) be installed in horizontal bearing (105), obligatory point runing rest (106) is hollow shaft structure, setting-in mutual exclusion magnetic confinement body (108) is gone back in this hollow shaft structure, this mutual exclusion magnetic confinement body (108) is made up of N-N or S-S, middle formation magnetic cavity (107), the laser beam that HeNe laser (102) sends can pass this magnetic cavity (107); Also comprise the rotary drive mechanism be connected with obligatory point runing rest (106) one end.
2. the magnetic confinement device of HeNe laser pack according to claim 1, is characterized in that: described mutual exclusion magnetic confinement body (108) is permanent magnet form or electromagnet form.
3. the magnetic confinement device of HeNe laser pack according to claim 1, is characterized in that: above-mentioned rotary drive mechanism is made up of motor (112), the driving pulley (113) be connected with motor output shaft, the driven pulley (110) being installed on obligatory point runing rest (106) one end, the driving belt (111) that is connected driving pulley (113) and driven pulley (110).
4. the method for work of the magnetic confinement device of HeNe laser pack according to claim 1, is characterized in that comprising following process:
When the laser that HeNe laser (102) sends is through magnetic cavity (107) that formed by mutual exclusion magnetic confinement body (108), because there is light deflection in laser in mutual exclusion magnetic field, make the peripheral light of laser beam toward off-centring, thus realize the object of laser pack performance raising;
And the raising of laser pack performance can be judged by spot diameter, the size of spot diameter can be detected by hot spot dimension transducer (109);
The change of laser pack performance is changed by the size of magnetic field intensity in adjustment magnetic cavity (107), and the size of magnetic cavity (107) magnetic field intensity and magnetic cavity diameter, magnetic cavity length are relevant.
5. the method for the magnetic confinement device of HeNe laser pack according to claim 4, is characterized in that comprising following process:
When described mutual exclusion magnetic confinement body (108) is for permanent magnet form, the change of magnetic cavity length is realized by the adjustment of permanent magnet axial length; The change of magnetic cavity diameter is realized by the adjustment of pole pair spacing each in mutual exclusion magnetic confinement body (108).
6. the method for the magnetic confinement device of HeNe laser pack according to claim 4, is characterized in that comprising following process:
When described mutual exclusion magnetic confinement body (108) is formed for electromagnet, the change of magnetic cavity length is realized by the multiple electromagnet of axial series, and the electromagnet quantity of series connection increases, then magnetic cavity length increases; The change of magnetic cavity diameter is realized by the adjustment of electromagnet coils size of current, and electric current increases, and magnetic cavity diameter reduces, and electric current reduces, and magnetic cavity diameter increases.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4974228A (en) * | 1988-11-08 | 1990-11-27 | Spectra-Physics, Inc. | Magnetic field profile for improved ion laser performance |
| CN102322825A (en) * | 2011-06-02 | 2012-01-18 | 南京航空航天大学 | Optical measuring system and method for coaxiality of extra-long-hole part |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4974228A (en) * | 1988-11-08 | 1990-11-27 | Spectra-Physics, Inc. | Magnetic field profile for improved ion laser performance |
| CN102322825A (en) * | 2011-06-02 | 2012-01-18 | 南京航空航天大学 | Optical measuring system and method for coaxiality of extra-long-hole part |
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