CN104267051A - Wire earth radiation test device and method - Google Patents

Abstract

The invention discloses a wire earth radiation test device. By adopting the wire earth radiation test device, an irradiated sample can continuously rotate at a constant speed when being irradiated, so that the uniform deposition amount of the sample during irradiation is guaranteed. The wire earth radiation test device comprises an irradiation source, a motor, a motor rotating shaft, a fixture, a vertical fixed support, a vertical movement support and a horizontal base, wherein the motor rotating shaft rotates at the constant speed which is no more than 20r/min, and the number of internal rotation turns during the irradiation is more than 10; irradiation source energy is energy corresponding to an amount deposition curve when a horizontal coordinate is (R2-R1) and a longitudinal coordinate is in a range of (R1/R2) minus or plus 15%. The wire earth radiation test device is simple in structure and easy to use, so that high-energy electrons can be uniformly deposited in cylindrical materials such as wires.

Description

A kind of wire terrestrial radiation test unit and method

Technical field

The present invention relates to radiation effect technical field, be specifically related to a kind of wire terrestrial radiation test unit and method.

Background technology

The impact of radiation on material property effect must be considered during selection material in Spacecraft guidance and control, to ensure that it completes predetermined function in space radiation environment, therefore material must carry out ground irradiation test before the application of space, and the dummy source that ground irradiation test adopts is generally gamma ray projector and high energy electron.

High energy electron has very high dose rate, can shorten the test period, improve test efficiency, but due to the penetration capacity of high energy electron limited, limit the use of high energy electron as Irradiation simulating source.

When current use high energy electron is as dummy source, in order to improve high energy electron deposit depth in the material, adopt the method for sample being carried out to turn-over, this kind of method is for plate material, use the electronics of identical energy, can effectively improve can the thickness of exposed material, but to cylindrical material such as wires conventional in evaluating with Space Radiation Effects, then dosage deposition uniformity in the material can be made to be deteriorated.

Summary of the invention

In view of this, the invention provides a kind of wire terrestrial radiation test unit, can make to rotate by irradiation sample continuously and smoothly when irradiation to ensure that sample is by irradiation dose uniform deposition.

Wire terrestrial radiation test unit of the present invention, comprise irradiation bomb, motor, motor rotary shaft, fixture, vertical fixed support, vertical traversing carriage and horizontal base, wherein, vertical fixed support is fixedly mounted on horizontal base; Motor is fixedly mounted on vertical fixed support, and motor rotary shaft is through vertical fixed support; Fixture is fixedly mounted on motor rotary shaft; Vertical traversing carriage is arranged on horizontal base, relative with vertical fixed support, can move along horizontal base; Vertical traversing carriage is provided with perforate at the relative position of motor rotary shaft; Wherein, motor rotary shaft average rate rotates, and rotating speed is no more than 20 revs/min, and in exposure time, the rotation number of turns is greater than 10;

The determination mode of radiant source is: from the dosage sedimentation curve group of the insulating layer material of wire, find horizontal ordinate to be (R ₂-R ₁) time, ordinate is at (R ₁/ R ₂dosage sedimentation curve in) ± 15% scope, the energy that dosage sedimentation curve is corresponding is radiant source, wherein, R ₂for the radius of wire insulation, R ₁for the radius of wire copper core.

Wherein, described fixture, vertical fixed support, vertical traversing carriage and horizontal base adopt duralumin material to make.

The above-mentioned wire terrestrial radiation test unit of a kind of employing carries out wire terrestrial radiation test method, comprises the steps:

Step 1, be placed on by wire on wire terrestrial radiation test unit, wire one end is fixed by fixture, and the other end is placed in the hole of vertical traversing carriage, arranges the distance between vertical traversing carriage with vertical fixed support according to conductor length;

Step 2, is placed on below irradiation bomb by wire terrestrial radiation test unit, and adjustment motor speed, makes motor at the uniform velocity rotate, and rotates the number of turns more than 10 in the exposure time of regulation, and motor speed is no more than 20 revs/min;

Step 3, according to the dosage sedimentation curve of different-energy high energy electron in wire insulation layer material, selection horizontal ordinate is (R ₂-R ₁) time, ordinate is at (R ₁/ R ₂dosage sedimentation curve in) ± 15% scope, the energy that dosage sedimentation curve is corresponding is radiant source, and radiation dose rate, for requiring dose rate, carries out irradiation test to wire, the exposure time that irradiation specifies.

Beneficial effect:

Structure of the present invention is simple, easy to use, can make high energy electron uniform deposition in the cylindrical material such as wire.

Accompanying drawing explanation

Fig. 1 is apparatus of the present invention structural representation.

Fig. 2 is wire gauge schematic diagram.

Fig. 3 is the dosage sedimentation curve of typical high energy electron (1Mev) in material (teflon).

Schematic diagram when Fig. 4 is wire irradiation.

Wherein, 1-motor (attached reduction gear), 2-motor rotary shaft, 3-fixture, the vertical fixed support of 4-, the vertical traversing carriage of 5-, 6-horizontal base, 7-wire.

Embodiment

To develop simultaneously embodiment below in conjunction with accompanying drawing, describe the present invention.

The invention provides a kind of wire terrestrial radiation test unit, as shown in Figure 1, comprise motor 1, motor rotary shaft 2, fixture 3, vertical fixed support 4, vertical traversing carriage 5 and horizontal base 6, wherein, vertical fixed support 4 is fixedly mounted on horizontal base 6; Motor 1 is fixedly mounted on vertical fixed support 4, and motor rotary shaft 2 is through vertical fixed support 4; Fixture 3 is fixedly mounted on motor rotary shaft 2, for clamping wire 7; Vertical traversing carriage 5 is arranged on horizontal base 6, relative with vertical fixed support 4, vertical traversing carriage 5 is provided with perforate at the relative position of motor rotary shaft 2, for support wire 7, vertical traversing carriage 5 can move along horizontal base, arranges the distance between vertical fixed support 4 with vertical traversing carriage 5 according to the length of wire 7.

The present invention adopts this telecontrol equipment that specimen material is at the uniform velocity rotated when irradiation, makes irradiation dose uniform deposition in the material, is applicable to the high-energy electron irradiation test of the cylindrical material such as wire.

Wherein, because aluminium is when irradiation, less on irradiation field impact, therefore, fixture 3, vertical fixed support 4, vertical traversing carriage 5 and horizontal base 6 adopt duralumin material to make.

Motor rotary shaft 2 can not be controlled when considering that motor 1 rotates completely and rotate whole circle, cause the situation occurring that irradiation is uneven, analyze known, in exposure time, when the motor rotation number of turns is greater than 10, can ensure that unevenness is less than 5%, therefore, when irradiation test, control the exposure time built-in motor rotation number of turns and be greater than 10.Meanwhile, if motor speed is too fast, wire 7 may be worn at vertical traversing carriage 5 place, and therefore, general control motor speed is no more than 20 revs/min.For this reason, on motor, additional reduction gear controls to realize motor speed.

During wire uniform rotation, the size of beam energy also has impact to the homogeneity of deposition, and energy is too little, then during turning in can not realize uniform deposition; Energy is too large, then deposit depth passes irradiated one side of something but fails to penetrate whole material completely, affects second half deposition uniformity; If energy is enough large, deposit depth is greater than the diameter of material, then do not need apparatus of the present invention just can realize irradiation test.

For this right cylinders such as wires, as shown in Figure 2, comprise insulation course and copper core, wherein, the radius of insulation course is R ₂, the radius of copper core is R ₁, consider that electron beam irradiation is when right cylinder internal layer, although energy reduces, but its irradiated area also reduces simultaneously, therefore, the irradiation uniformity that the mode of same irradiation density (irradiation energy/irradiated area) realizes inside and outside right cylinder can be adopted, that is:

$\frac{D_2}{2\mathrm{\π}{R}_2}=\frac{D_1}{2\mathrm{\π}{R}_1}$

Wherein, 2 π R ₂be radius be R ₂circumference, be R by radius ₂the surface area of circular column draft when becoming plane; 2 π R ₁be radius be R ₁circumference, be R by radius ₁the surface area of circular column draft when becoming plane; D ₂the energy of electronic deposition on surface of particular energy; D ₁corresponding be deposited on (R ₂-R ₁) energy at place.

Because electron-beam dose sedimentation curve and exposed material, beam energy are relevant, therefore, after determining exposed material, adopt the electron beam of different-energy to carry out irradiation to wire insulation layer material, obtain dosage sedimentation curve group; In dosage sedimentation curve group, selection horizontal ordinate is (R ₂-R ₁) time, ordinate is at (R ₁/ R ₂dosage sedimentation curve in) ± 15% scope, the electron energy that this dosage sedimentation curve is corresponding is selected beam energy.

Such as, certain wire external layer insulating material is teflon, its radius R ₂for 4mm; Internal layer is copper core, radius R ₁for 1mm; Need electron irradiation 10 minutes.First be placed on by wire on wire terrestrial radiation test unit, wire one end is fixed by fixture 3, and the other end is placed in the hole of vertical traversing carriage 5, arranges the distance between vertical traversing carriage 5 with vertical fixed support 4 according to conductor length; Then be placed on below electron beam by wire terrestrial radiation test unit, as shown in Figure 4, will the place of irradiation do not needed to shield, adjustment motor speed be 10 revs/min, according to R ₂-R ₁=3mm, 2 π R ₁/ 2 π R ₂=1/4=25%, and the dosage sedimentation curve (Fig. 3) of high energy electron (1Mev) in polytetrafluoroethylmaterial material is known, 1MeV electron beam meets the requirements, therefore, selection beam energy is 1MeV, dose rate is for requiring that dose rate carries out irradiation test to wire, and exposure time is 10 minutes.Thus, can guarantee that wire is subject to the homogeneity of irradiation dose.

In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (3)

1. a wire terrestrial radiation test unit, it is characterized in that, comprise: irradiation bomb, motor (1), motor rotary shaft (2), fixture (3), vertical fixed support (4), vertical traversing carriage (5) and horizontal base (6), wherein, vertical fixed support (4) is fixedly mounted on horizontal base (6); Motor (1) is fixedly mounted on vertical fixed support (4), and motor rotary shaft (2) is through vertical fixed support (4); Fixture (3) is fixedly mounted on motor rotary shaft (2); Vertical traversing carriage (5) is arranged on horizontal base (6), relative with vertical fixed support (4), can move along horizontal base; Vertical traversing carriage (5) is provided with perforate at the relative position of motor rotary shaft (2); Wherein, motor rotary shaft (2) average rate rotates, and rotating speed is no more than 20 revs/min, and in exposure time, the rotation number of turns is greater than 10;

The determination mode of radiant source is: from the dosage sedimentation curve group of the insulating layer material of wire, find horizontal ordinate to be (R ₂-R ₁) time, ordinate is at (R ₁/ R ₂dosage sedimentation curve in) ± 15% scope, the energy that dosage sedimentation curve is corresponding is radiant source, wherein, R ₂for the radius of wire insulation, R ₁for the radius of wire copper core.

2. wire terrestrial radiation test unit as claimed in claim 1, it is characterized in that, described fixture (3), vertical fixed support (4), vertical traversing carriage (5) and horizontal base (6) adopt duralumin material to make.

3. a wire terrestrial radiation test method, is characterized in that, adopt wire terrestrial radiation test unit as claimed in claim 1 or 2 to carry out irradiation test, concrete steps are as follows:

Step 1, wire is placed on wire terrestrial radiation test unit, wire one end is fixed by fixture (3), the other end is placed in the hole of vertical traversing carriage (5), arranges the distance between vertical traversing carriage (5) with vertical fixed support (4) according to conductor length;

Step 2, is placed on below irradiation bomb by wire terrestrial radiation test unit, and adjustment motor speed, makes motor at the uniform velocity rotate, and rotates the number of turns more than 10 in the exposure time of regulation, and motor speed is no more than 20 revs/min;

Step 3, according to the dosage sedimentation curve of different-energy high energy electron in wire insulation layer material, selection horizontal ordinate is (R ₂-R ₁) time, ordinate is at (R ₁/ R ₂dosage sedimentation curve in) ± 15% scope, the energy that dosage sedimentation curve is corresponding is radiant source, and radiation dose rate, for requiring dose rate, carries out irradiation test to wire, the exposure time that irradiation specifies.