CN203720116U - Novel wedge interference linear expansion coefficient tester - Google Patents
Novel wedge interference linear expansion coefficient tester Download PDFInfo
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- CN203720116U CN203720116U CN201420076169.0U CN201420076169U CN203720116U CN 203720116 U CN203720116 U CN 203720116U CN 201420076169 U CN201420076169 U CN 201420076169U CN 203720116 U CN203720116 U CN 203720116U
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Abstract
The utility model discloses a novel wedge interference linear expansion coefficient tester, and relates to a physical experiment instrument. The principle is as follows: a wedge interferometer is utilized for replacing an optical lever to measure the tiny elongation of a to-be-tested metal rod subjected to heating expansion, optical flat glass I of the wedge interferometer is connected with the to-be-tested metal rod by a support, a knife edge and a quartz rod, when the to-be-tested metal rod is subjected to heating expansion, the optical flat glass I of the wedge interferometer is lifted up, and the optical flat glass I and optical flat glass II can form an angle theta, thereby forming an air wedge; and a distance between two adjacent bright fringes is measured, the elongation of the to-be-tested metal rod can be calculated and the coefficient of linear expansion of the to-be-tested metal rod can be further calculated. The novel wedge interference linear expansion coefficient tester has the beneficial effects of high measurement precision, convenience and rapidness in adjustment and shortening of the testing time.
Description
Technical field
The utility model relates to a kind of physical experiment apparatus, and specifically a kind of novel splitter is interfered apparatus for measuring linear expansion coefficient.
Background technology
Existing linear expansion coefficient analyzer utilizes optical lever principle, the small elongation of metal tube is amplified, by being placed in the movement of the telescope viewing plane mirror scale virtual image at a distance, through calculating the physical length recruitment of metal tube.In measuring process, experimenter's adjusting of will running back and forth between telescope and apparatus for measuring linear expansion coefficient, should spend a large amount of time, and measurement result neither be very accurate.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art part, the utility model provides a kind of novel splitter to interfere apparatus for measuring linear expansion coefficient, can accurately measure the miniature deformation amount of metal bar to be measured, and it is accurately convenient to measure.
The utility model is achieved by the following technical solution: a kind of novel splitter is interfered apparatus for measuring linear expansion coefficient, comprises the microscopic platform being placed in horizontal table top; On the microscope article carrying platform of described microscopic platform, horizontal positioned has optical plate glass II; Described microscope article carrying platform two ends are respectively equipped with platform adjusting screw I and platform adjusting screw II; Horizontal positioned optical plate glass I in described optical plate glass II; One side of described optical plate glass I is fixed with support;
Described horizontal table top right side is placed with without top electrothermal furnace; Described electrothermal furnace is built-in with temperature probe, quartz pushrod I, metal bar to be measured and quartz pushrod II; Described temperature probe is connected with temperature and controls display instrument; At the bottom of described quartz pushrod I is placed on electrothermal furnace, on it, place metal bar to be measured, on metal bar to be measured, place quartz pushrod II; Described quartz pushrod II upper end is fixed with the edge of a knife; Support is withstood in described edge of a knife upper end;
Microscopic platform one side is connected with handel; Described handel upper end is fixed with microscope; Described microscope is positioned at optical plate glass I top, and microscope one side is connected with connection bracket; Described connection bracket lower end is connected with the semi-transparent semi-reflecting lens that angle of inclination can regulate, and semi-transparent semi-reflecting lens is between optical plate glass I and microscope; In the horizontal table top of microscopic platform left side, be also placed with sodium lamp; Between described sodium lamp and semi-transparent semi-reflecting lens, be provided with the convex lens of vertical placement; Being centered close on same straight line of described sodium lamp, the center of convex lens and semi-transparent semi-reflecting lens.
Principle of the present utility model is: the small elongation while utilizing splitter interferometer to replace optical lever to measure metal bar expanded by heating to be measured, optical plate glass I in splitter interferometer is connected together by support, the edge of a knife, quartz pushrod and metal bar to be measured, when metal bar expanded by heating to be measured, by the optical plate glass I in jack-up splitter interferometer, between optical plate glass I and optical plate glass II, can open an angle θ, form air splitter.Measure the distance between adjacent two bright fringes, just can calculate the elongation of metal bar to be measured, further can be calculated the linear expansion coefficient of metal bar to be measured.
The utility model utilizes splitter to interfere measuring and calculating metal bar to be heated the miniature deformation amount while expanding, and its degree of accuracy is high; Utilizing temperature probe and temperature to control display instrument replaces the temperature value of traditional thermometer measure metal bar accurately convenient.
The beneficial effects of the utility model are: measuring accuracy is high, quick, the shortening test duration easy to adjust.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
In figure: 1, sodium lamp; 2, convex lens; 3, semi-transparent semi-reflecting lens; 4, optical plate glass I; 5, optical plate glass II; 6, microscope article carrying platform; 7, support; 8, the edge of a knife; 9, quartz pushrod II; 10, metal bar to be measured; 11, electrothermal furnace; 12, quartz pushrod I; 13, horizontal table top; 14, platform adjusting screw I; 15, microscopic platform; 16, platform adjusting screw II; 17, temperature probe; 18, temperature is controlled display instrument; 19, microscope; 21, handel; 21, connection bracket.
Embodiment
Be below a specific embodiment of the present utility model, now by reference to the accompanying drawings the utility model be described further.
As shown in Figure 1, a kind of novel splitter is interfered apparatus for measuring linear expansion coefficient, and it comprises the microscopic platform 15 being placed in horizontal table top 13; On the microscope article carrying platform 6 of microscopic platform 15, horizontal positioned has optical plate glass II 5, horizontal positioned optical plate glass I 4 in optical plate glass II 5, one side optical plate glass I 4 be fixed with support 7; At microscope article carrying platform 6 two ends, be respectively equipped with platform adjusting screw I 14 and platform adjusting screw II 16, use the levelness of platform adjusting screw 14,16 adjustable microscope article carrying platforms 6.
On horizontal table top 13 right sides, be placed with without top electrothermal furnace 11; Electrothermal furnace 11 inside are placed with temperature probe 17, quartz pushrod I 12, metal bar to be measured 10 and quartz pushrod II 9; Temperature probe 17 is connected with temperature and controls display instrument 18, and it is the temperature that show that temperature probe 17 is surveyed that temperature is controlled display instrument 18 effects; At electrothermal furnace 11 inner bottom parts, place quartz pushrod I 12, on it, place metal bar 10 to be measured, on metal bar 10 to be measured, place quartz pushrod II 9; Quartz pushrod II 9 upper ends are fixed with the edge of a knife 8, and the edge of a knife 8 upper ends prop up support 7.
Microscopic platform 15 1 sides are connected with handel 20; Handel 20 upper ends are fixed with microscope 19; Microscope 19 is positioned at optical plate glass I 4 tops, and one side is connected with connection bracket 21; Connection bracket 21 lower ends are connected with the semi-transparent semi-reflecting lens 3 that angle of inclination can regulate, and semi-transparent semi-reflecting lens 3 is between optical plate glass I 4 and microscope 19; In microscopic platform 15 left side horizontal table top 13, be also placed with sodium lamp 1; Between sodium lamp 1 and semi-transparent semi-reflecting lens 3, be provided with the convex lens 2 of vertical placement; Being centered close on same straight line of the center of sodium lamp 1, convex lens 2 and semi-transparent semi-reflecting lens 3.
Measuring principle and method are as follows: metal bar 10 to be measured and very little quartz pushrod II 9, the quartz pushrod I 12 of linear expansion coefficient are overlayed in sleeve pipe, support 7 is placed on the edge of a knife 8 of quartz pushrod 9 upper ends.By platform adjusting screw I 14 and platform adjusting screw II 16, regulate microscope article carrying platform 6 levels, optical plate glass I 4 and optical plate glass II 5 are close together, at this moment from microscope 19, will can't see interference fringe.If the temperature of the metal bar to be measured 10 of now being measured by temperature probe 17 and temperature control display instrument 18 is t
1, when metal bar 10 to be measured is heated by electrothermal furnace 11, temperature is elevated to t
2time, its length has been extended Δ L, and jack-up and optical plate glass I 4 are linked to be to holistic support 7.In heating process, the quartz pushrod II 9 directly contacting with metal bar 10 to be measured, there is hardly deformation in quartz pushrod I 12, between optical plate glass I 4 and optical plate glass II 5, can open an angle θ, form air splitter, the light sending from sodium lamp 1 is through convex lens 2, be converged as directional light, be radiated on semi-transparent semi-reflecting lens 3, wherein reflection ray vertical sand shooting is to optical plate glass I 4 and optical plate glass II 5, two-beam in the lower surface of optical plate glass I 4 and the reflection of the upper surface of optical plate glass II 5 can interfere phenomenon, in microscope 19 visual fields, one group of equal thick interference fringe that boundary line is parallel and interval is equal with optical plate glass I 4 and optical plate glass II 5 will be seen.The optical path difference of the two-beam interfering is:
When Δ=k λ, (k=1,2,3 ...) time, for interfering bright fringe, the thickness of establishing the bright line of k level place splitter is d
k, the thickness of the bright line of k+1 level place splitter is d
k+1,
because θ is very little, so
wherein b is the distance between adjacent two bright fringes.Meanwhile,
Δ L is the elongation of metal bar 10 to be measured, and D is that splitter summit is to the distance on the edge of a knife 8 summits.So just have
thus, linear expansion coefficient is
in formula, L is the length of metal bar 9 to be measured while not heating, and λ is the optical wavelength that sodium lamp 1 sends.
Claims (1)
1. novel splitter is interfered an apparatus for measuring linear expansion coefficient, it is characterized in that: comprise the microscopic platform (15) being placed in horizontal table top (13); The upper horizontal positioned of microscope article carrying platform (6) of described microscopic platform (15) has optical plate glass II (5); Described microscope article carrying platform (6) two ends are respectively equipped with platform adjusting screw I (14) and platform adjusting screw II (16); The upper horizontal positioned optical plate glass I (4) of described optical plate glass II (5); One side of described optical plate glass I (4) is fixed with support (7);
Described horizontal table top (13) right side is placed with without top electrothermal furnace (11); Described electrothermal furnace (11) is built-in with temperature probe (17), quartz pushrod I (12), metal bar to be measured (10) and quartz pushrod II (9); Described temperature probe (17) is connected with temperature and controls display instrument (18); Described quartz pushrod I (12) is placed on electrothermal furnace (11) end, places metal bar to be measured (10) on it, the upper quartz pushrod II (9) of placing of metal bar to be measured (10); Described quartz pushrod II (9) upper end is fixed with the edge of a knife (8); Support (7) is withstood in the described edge of a knife (8) upper end;
Microscopic platform (15) one sides are connected with handel (20); Described handel (20) upper end is fixed with microscope (19); Described microscope (19) is positioned at optical plate glass I (4) top, and microscope (19) one sides are connected with connection bracket (21); Described connection bracket (21) lower end is connected with the semi-transparent semi-reflecting lens (3) that angle of inclination can regulate, and semi-transparent semi-reflecting lens (3) is positioned between optical plate glass I (4) and microscope (19); In microscopic platform (15) left side horizontal table top (13), be also placed with sodium lamp (1); Between described sodium lamp (1) and semi-transparent semi-reflecting lens (3), be provided with the convex lens (2) of vertical placement; Being centered close on same straight line of the center of described sodium lamp (1), convex lens (2) and semi-transparent semi-reflecting lens (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420076169.0U CN203720116U (en) | 2014-02-21 | 2014-02-21 | Novel wedge interference linear expansion coefficient tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420076169.0U CN203720116U (en) | 2014-02-21 | 2014-02-21 | Novel wedge interference linear expansion coefficient tester |
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| Publication Number | Publication Date |
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| CN203720116U true CN203720116U (en) | 2014-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420076169.0U Expired - Fee Related CN203720116U (en) | 2014-02-21 | 2014-02-21 | Novel wedge interference linear expansion coefficient tester |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297285A (en) * | 2014-09-10 | 2015-01-21 | 董赫 | Metal linear expansion coefficient measuring device based on Michelson interference method |
| CN107884433A (en) * | 2017-11-10 | 2018-04-06 | 哈尔滨学院 | A kind of experimental provision using Newton's ring instrument metal linear expansion coefficient measurement |
| CN108680263A (en) * | 2018-05-16 | 2018-10-19 | 华南理工大学 | A kind of contactless glass temperature measuring system and method based on laser interference |
| CN109579708A (en) * | 2018-12-24 | 2019-04-05 | 浙江工业大学 | Nanometer resolution displacement measuring device based on optical wedge interference |
| CN110243290A (en) * | 2019-04-03 | 2019-09-17 | 浙江工业大学 | Read the Three Degree Of Freedom nanopositioning stage of displacement rotation information in real time by optical interference method |
-
2014
- 2014-02-21 CN CN201420076169.0U patent/CN203720116U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297285A (en) * | 2014-09-10 | 2015-01-21 | 董赫 | Metal linear expansion coefficient measuring device based on Michelson interference method |
| CN107884433A (en) * | 2017-11-10 | 2018-04-06 | 哈尔滨学院 | A kind of experimental provision using Newton's ring instrument metal linear expansion coefficient measurement |
| CN108680263A (en) * | 2018-05-16 | 2018-10-19 | 华南理工大学 | A kind of contactless glass temperature measuring system and method based on laser interference |
| CN109579708A (en) * | 2018-12-24 | 2019-04-05 | 浙江工业大学 | Nanometer resolution displacement measuring device based on optical wedge interference |
| CN110243290A (en) * | 2019-04-03 | 2019-09-17 | 浙江工业大学 | Read the Three Degree Of Freedom nanopositioning stage of displacement rotation information in real time by optical interference method |
| CN110243290B (en) * | 2019-04-03 | 2023-11-17 | 浙江工业大学 | Three-degree-of-freedom nanometer positioning platform capable of reading displacement rotation information in real time through optical interference method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140716 Termination date: 20150221 |
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| EXPY | Termination of patent right or utility model |