CN108872280B - Detector positioning device for small-angle neutron scattering spectrometer - Google Patents
Detector positioning device for small-angle neutron scattering spectrometer Download PDFInfo
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- CN108872280B CN108872280B CN201811091387.0A CN201811091387A CN108872280B CN 108872280 B CN108872280 B CN 108872280B CN 201811091387 A CN201811091387 A CN 201811091387A CN 108872280 B CN108872280 B CN 108872280B
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Abstract
The invention discloses a detector positioning device for a small-angle neutron scattering spectrometer. The device moves a detector positioned in a vacuum cavity of the small-angle neutron scattering spectrometer, drives a stay wire sensor connected with the detector to move, and transmits signals to a computer through an aviation plug; the computer controls the stepping motor to rotate so as to drive the conveyor belt to slide, thereby driving the LED indicator lamp on the movable slide block to move correspondingly; the LED indicator lamp provides real-time and accurate position information before, after and during the movement of the detector through the scale which indicates accurate calibration. The device can monitor the position of the detector in the experimental process of the small-angle neutron scattering spectrometer in real time, has the advantages of simple installation, easy disassembly, real-time, accurate positioning, automation and labor saving, and is suitable for acquiring the real-time and accurate position information of the detector in the vacuum cavity of the small-angle neutron scattering spectrometer before, after and during the movement and the distance between the sample and the detector.
Description
Technical Field
The invention belongs to the technical field of neutron scattering in-situ automatic measurement, and particularly relates to a detector positioning device for a small-angle neutron scattering spectrometer.
Background
The small angle neutron scattering technology has wide application and unique advantages in the research of soft materials, alloys and other material fields. The identification capability of neutrons to light elements is utilized, and the small-angle neutron scattering technology is combined with an isotope replacement method to play an over-bond role in the researches of soft material structure analysis, dynamics, molecular chain mechanisms and the like. However, accurate monitoring and acquisition of the "sample-to-detector distance" is an important link in the small angle neutron scattering experimental process, and relates to the accuracy and efficiency of the experiment. Because the detector of the small-angle neutron scattering spectrometer is in the vacuum cavity, the specific position of the detector cannot be directly observed, and the conditions of step loss, connection loss and the like in the process of controlling the detector to move back and forth by the servo motor can lead to the misalignment of the distance from the sample to the detector. In order to obtain accurate scattering vectors, it is highly desirable to develop a device that can display the "sample-to-detector distance" in real time. The high-precision position sensor is combined with the positioning scale, so that the positioning of the detector can be accurately displayed in real time, the distance from the sample to the detector can be calibrated, and new convenience is provided for small-angle neutron scattering experiments.
At present, the domestic neutron scattering (diffraction) technology is in a starting stage, and no company has been found to design and develop a matched device with real-time accurate display detector positioning aiming at a neutron scattering (diffraction) spectrometer. While the X-rays do not require similar equipment due to the fact that the detector is outside the vacuum chamber, similar exploration based on synchrotron radiation light sources and commercial light sources is not found. The position signal of the servo motor is usually used as a judgment basis on the international small-angle neutron scattering platform, but the problems exist, and under the condition that the servo motor is in error and needs to be powered off, a great deal of precious experiment time is wasted due to position zeroing. Visual real-time detector positioning and "sample-to-detector distance" acquisition cannot be achieved with only servo motor position signals.
At present, development of a detector positioning device for a small-angle neutron scattering spectrometer is needed, the detector positioning device can accurately position a detector and acquire parameters of 'sample-to-detector distance' in real time after an experiment in the experimental process before a small-angle neutron scattering experiment, and great convenience is provided for the small-angle neutron scattering experiment.
Disclosure of Invention
The invention aims to provide a detector positioning device for a small-angle neutron scattering spectrometer.
The invention relates to a detector positioning device for a small-angle neutron scattering spectrometer, which is characterized in that: the detector positioning device comprises a stay wire sensor, an aviation plug, a computer, a stepping motor, a conveyor belt, a movable sliding block, an LED indicator lamp, a guide rail, a bearing and a scale; the wire sensor is connected to a detector in the vacuum cavity and is in communication connection with an external computer through an aviation plug, meanwhile, the computer is in communication connection with the stepping motor, and the computer receives a signal of the wire sensor and sends an instruction to the stepping motor to control the stepping motor to move;
an annular conveyor belt is arranged between the stepping motor and the bearing, a driving guide rail is fixed at the annular center position of the conveyor belt, one end of a sliding block is fixed on the conveyor belt, the other end of the sliding block is fixed on the driving guide rail, and the stepping motor drives the conveyor belt to drive the sliding block to linearly move along the driving guide rail;
the scale is provided with scales and is arranged in parallel with the driving guide rail;
the movable slide block is provided with an LED indicator lamp, the LED indicator lamp is an arrow, the arrow indicates the position of the scale, and the arrow reflects the real-time position of the detector.
The stay wire sensor, the aviation plug, the conveyor belt, the movable sliding block, the guide rail, the bearing and the scale are made of neutron activation resistant metal materials, and are stainless steel, aluminum and cadmium.
The conveyor belt is made of rubber.
The small-angle neutron scattering spectrometer is a reactor neutron source or a spallation neutron source.
The detector positioning device for the small-angle neutron scattering spectrometer has the following characteristics:
1. the device adopts a pull wire sensor to be connected to a detector in a detector vacuum cavity to be calibrated, and is connected with an external computer signal through an aviation plug, so that a real-time accurate position signal of the detector can be obtained, the intuitiveness is greatly improved, and the possibility of misoperation is reduced; if a servo motor is adopted to control the conditions of step loss, connection loss and the like in the forward and backward movement of the detector, the condition of misalignment of the distance from the sample to the detector is brought about;
2. the stay wire sensor, aviation plug, conveyor belt, movable slide block, guide rail, bearing and scale in the device are made of stainless steel, aluminum, cadmium and other neutron activation resistant metal materials; the conveyor belt is made of rubber, so that the safety of the device after neutron scattering experiments is ensured;
3. the stepping motor, the bearing and the conveyor belt in the device can realize closed-loop movement, the sliding guide rail can accurately control the position of the movable sliding block, and the LED indicator lamp can intuitively display the position of the movable sliding block through the scale;
4. the neutron source used by the small angle neutron scattering spectrometer in the device can be a reactor neutron source or a spallation neutron source.
The main working process of the detector positioning device for the small-angle neutron scattering spectrometer is as follows:
a. the detector positioning device for the small-angle neutron scattering spectrometer is arranged on a small-angle neutron scattering experiment line station, and a power line and a signal line are connected into a detector vacuum cavity of the small-angle neutron scattering spectrometer by using an aviation plug; fixing the scale in parallel on the outer surface of a vacuum cavity of a detector of the small-angle neutron scattering spectrometer;
b. starting a control power supply, starting an LED indicator lamp switch, and setting a corresponding stepping motor program;
c. the displacement control program in the computer is opened, the detector of the small-angle neutron scattering spectrometer is moved to a zero position, the LED indicator lamp is adjusted to correspond to the zero position, the corresponding relation between the stay wire sensor signal and the actual position is set through the computer, the computer receives the stay wire sensor signal and sends an instruction to the stepping motor through the displacement control program, the stepping motor is controlled to rotate, and the stepping motor drives the conveyor belt to drive the sliding block to linearly move along the driving guide rail;
d. the displacement control program of the computer is used for adjusting the parameters of the distance from the sample to the detector required by the experiment, the detector starts to move, and the LED indicator lamp outside the cavity of the detector is observed to move along the guide rail and indicates real-time and accurate position information; when the detector moves to a designated position, the LED indicator lamp stops moving, the LED indicator lamp indicates position information, and the 'distance from sample to detector' is reflected through the scale;
the detector positioning device for the small-angle neutron scattering spectrometer can be used in combination with small-angle neutron scattering, provides real-time and accurate position information before, after and during the movement of the detector through the scale which is accurately calibrated through indication by the LED indicator lamp, and rapidly acquires the parameters of 'sample-to-detector distance'. The limitation that the small-angle neutron scattering detector cannot directly observe the specific position of the small-angle neutron scattering detector in the vacuum cavity is overcome. The method has the advantages of simple installation, easy disassembly, real-time observation, accuracy, automation, labor saving and the like, is suitable for the use condition that the distance parameter from the sample to the detector needs to be changed from time to time for the small-angle neutron scattering spectrometer, and provides new convenience for the small-angle neutron scattering experiment.
Drawings
FIG. 1 is a block diagram of a detector positioning apparatus for a small angle neutron scattering spectrometer of the present invention.
In the figure, 1, a stay wire sensor 2, an aviation plug 3, a computer 4, a stepping motor 5, a conveyor belt 6, a movable sliding block 7, an LED indicator lamp 8, a guide rail 9, a bearing 10 and a scale.
The specific embodiment is as follows:
the invention is described in detail below with reference to the drawings and examples.
As shown in fig. 1, the detector positioning device for the small-angle neutron scattering spectrometer comprises a stay wire sensor 1, an aviation plug 2, a computer 3, a stepping motor 4, a conveyor belt 5, a movable sliding block 6, an LED indicator lamp 7, a guide rail 8, a bearing 9 and a scale 10; the wire drawing sensor 1 is connected to a detector in the vacuum cavity and is in communication connection with an external computer 3 through an aviation plug 2, meanwhile, the computer 3 is in communication connection with a stepping motor 4, and the computer 3 receives signals of the wire drawing sensor 1 and sends instructions to the stepping motor 4 to control the stepping motor 4 to move;
an annular conveyor belt 5 is arranged between the stepping motor 4 and the bearing 9, a driving guide rail 8 is fixed at the annular center position of the conveyor belt 5, one end of a sliding block 6 is fixed on the conveyor belt 5, the other end of the sliding block 6 is fixed on the driving guide rail 8, and the stepping motor 4 drives the conveyor belt 5 to drive the sliding block 6 to linearly move along the driving guide rail 8;
the scale 10 is provided with scales and is arranged in parallel with the driving guide rail 8;
the movable slide block 6 is provided with an LED indicator lamp 7, the LED indicator lamp 7 is an arrow type, the arrow indicates the position of the scale 10, and the arrow reflects the real-time position of the detector.
The stay wire sensor 1, the aviation plug 2, the conveyor belt 5, the movable sliding block 6, the guide rail 8, the bearing 9 and the scale 10 are made of neutron activation resistant metal materials, and are stainless steel, aluminum and cadmium.
The material of the conveyor belt 5 is rubber.
The small-angle neutron scattering spectrometer is a reactor neutron source or a spallation neutron source.
Example 1
And (3) researching the silicone rubber nanocomposite by a small-angle neutron scattering experiment.
The purpose of the experiment is as follows:
the silicon rubber nano composite material consists of a high polymer matrix, nano filling particles, a vulcanizing agent, bonding glue and the like. The rubber is widely applied in the fields of national defense industry, aerospace, medical health, material research and the like due to the incomparable excellent properties of other rubbers such as high temperature resistance, low temperature resistance, radiation resistance, ozone resistance, physiological inertia, electrical insulation and the like. In order to comprehensively detect the wide-scale characteristics of the silicone rubber nanocomposite system, the small-angle neutron scattering means can be used for testing that primary particles with about 10 nanometers are fused into aggregates with 100-300 nanometers in the system in a very wide range. The experiment aims at utilizing the combination of three conditions that the test limit (1-500 nanometers) of a small-angle neutron scattering spectrometer and the corresponding sample-to-detector distance is 1 meter, 5 meters and 11 meters to test the scattering signal of the silicone rubber nanocomposite system, obtain important microstructure parameters, help understand the association of the microstructure and macroscopic mechanical properties of the silicone rubber nanocomposite system and guide the formula regulation and control of the material.
The experimental process comprises the following steps:
50 parts of silicone rubber nano composite material system is adopted to prepare a sheet-shaped spline with the thickness of 1 mm, the width of 12 mm and the length of 12 mm, and the spline is placed on a sample stage of a small-angle neutron scattering spectrometer at room temperature. And setting a small-angle neutron scattering control program to a state ready for testing. Firstly, setting the distance from a sample to a detector of the small-angle neutron scattering spectrometer to be 11 meters (initial position), starting a control program of the small-angle neutron scattering spectrometer, starting the detector to move, driving the stay wire sensor 1 to move, and transmitting signals to the computer 3 through the aviation plug 2; the computer 3 controls the stepping motor 4 to rotate so as to drive the conveyor belt 5 to slide; the LED indicator lamp on the movable slide block 6 moves along with the movable slide block by a corresponding distance, and when the detector moves to a specified position of 11 meters, the LED indicator lamp 6 stops moving and indicates the position of 11 meters on the scale 10. The experimental conditions were such that a small angle neutron scattering test at 11 meters was started. And (3) finishing experimental tests at the position of 11 meters, setting the distance from the sample to the detector of the small-angle neutron scattering spectrometer to be 5 meters, starting a control program of the small-angle neutron scattering spectrometer, starting the detector to move, moving the LED indicator lamp 6 of the detector positioning device along with the movement of the detector, stopping the movement of the LED indicator lamp when the detector moves to the formulated position of 5 meters, and indicating the position of 5 meters on the scale 10. A small angle neutron scattering test run at 5 meters was started. Similarly, the test was completed according to the procedure described above with a "sample-to-detector distance" of 1 meter.
According to the method, through three experimental conditions of 'sample-to-detector distance', the collection of the full-range small-angle neutron scattering data of the spectrometer of the silicone rubber nanocomposite system is completed, and through subsequent data reconstruction, the completed small-angle neutron scattering data of the silicone rubber nanocomposite system is obtained, and then primary particle and aggregate size and distribution information are obtained; in the experimental process, the detector positioning device of the small-angle neutron scattering spectrometer provides real-time and accurate position information before, after and during the movement of the detector. The experimental process is compact and efficient, and manpower and material resources are saved.
Example 2
And (3) researching a time small angle neutron scattering experiment of self-assembly of a high polymer solution.
The present example is substantially identical to the embodiment of example 1, with the main difference that the sample microstructure size of interest is about 50 nanometers, so that the "sample-to-detector distance" of the selected small angle neutron scattering spectrometer is 3 meters and 7 meters, and is more suitable for the study of the system.
The micelle size and distribution of the polymer solution under different acid-base conditions are obtained through a time small angle neutron scattering experiment of the polymer solution self-assembly.
Parts of the invention not described in detail are well known in the art.
While the foregoing describes illustrative embodiments of the present invention to facilitate an understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but is to be construed as protected by the accompanying claims insofar as various changes are within the spirit and scope of the present invention as defined and defined by the appended claims.
Claims (3)
1. A detector positioning device for a small angle neutron scattering spectrometer, characterized in that: the detector positioning device comprises a stay wire sensor (1), an aviation plug (2), a computer (3), a stepping motor (4), a conveyor belt (5), a movable sliding block (6), an LED indicator lamp (7), a guide rail (8), a bearing (9) and a scale (10); the wire-drawing sensor (1) is connected to a detector in the vacuum cavity and is in communication connection with an external computer (3) through an aviation plug (2), meanwhile, the computer (3) is in communication connection with the stepping motor (4), and the computer (3) receives signals of the wire-drawing sensor (1) and sends instructions to the stepping motor (4) to control the stepping motor (4) to move;
an annular conveyor belt (5) is arranged between the stepping motor (4) and the bearing (9), a driving guide rail (8) is fixed at the annular center position of the conveyor belt (5), one end of a movable sliding block (6) is fixed on the conveyor belt (5), the other end of the movable sliding block (6) is fixed on the driving guide rail (8), and the stepping motor (4) drives the conveyor belt (5) to drive the movable sliding block (6) to linearly move along the driving guide rail (8);
the scale (10) is marked with scales and is arranged in parallel with the driving guide rail (8);
the movable slide block (6) is provided with an LED indicator lamp (7), the LED indicator lamp (7) is an arrow type, the arrow indicates the position of the scale (10), and the arrow reflects the real-time position of the detector.
2. The detector positioning apparatus for a small angle neutron scattering spectrometer of claim 1, wherein: the stay wire sensor (1), the aviation plug (2), the conveyor belt (5), the movable sliding block (6), the guide rail (8), the bearing (9) and the scale (10) are made of neutron activation resistant metal materials, and are stainless steel, aluminum and cadmium.
3. The detector positioning apparatus for a small angle neutron scattering spectrometer of claim 1, wherein: the conveyor belt (5) is made of rubber.
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| CN104913866A (en) * | 2015-06-17 | 2015-09-16 | 上海大学 | Method of assisting ray diffraction method to measure residual stress of thin plate, device and applications |
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| US20080173825A1 (en) * | 2007-01-10 | 2008-07-24 | Eric Stanley Reiter | Particle violation spectroscopy |
| US9823203B2 (en) * | 2014-02-28 | 2017-11-21 | Sigray, Inc. | X-ray surface analysis and measurement apparatus |
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| CN104913866A (en) * | 2015-06-17 | 2015-09-16 | 上海大学 | Method of assisting ray diffraction method to measure residual stress of thin plate, device and applications |
| CN108375438A (en) * | 2016-12-22 | 2018-08-07 | 中国航空工业集团公司北京航空制造工程研究所 | A kind of XRD residual stress measurements parameter calibration device and method |
| CN208721593U (en) * | 2018-09-19 | 2019-04-09 | 中国工程物理研究院核物理与化学研究所 | A kind of probe position device for small-angle neutron scattering spectrometer |
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