CN203405431U - Novel laser metal linear expansion coefficient tester - Google Patents

Abstract

The utility model discloses a laser metal linear expansion coefficient tester, and belongs to the technical field o physical experiment instruments. The tester comprises a linear expansimeter, a to-be-measured metal tube, a thermometer and a laser optical lever, wherein the laser optical lever comprises a linear laser generator and a plane mirror; front tips and rear tips are respectively fixed at two ends of the plane mirror; the front two tips are put in a groove in the cover plate of the linear expansimeter, and the rear tips are arranged at an end of the metal tube; a scale is far away from a working platform and vertical to the linear laser generator. The laser metal linear expansion coefficient tester saves a telescope, is simple in structure, convenient to measure and low in production cost, enables the experiment operation steps to be simplified, can obtain a longer optical lever arm, and enables experiment errors to be remarkably reduced, so that the experiment accuracy is remarkably increased.

Description

New pattern laser linear expansion coefficient analyzer

Technical field

The utility model relates to a kind of new pattern laser linear expansion coefficient analyzer, belongs to physical experiment apparatus technical field.

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.Because the optical lever forming between telescope and linear expansion coefficient analyzer is long-armed long and telescopical field range is very little again, therefore to observe the picture of scale in level crossing, experimenter's adjusting of will running back and forth between telescope and apparatus for measuring linear expansion coefficient, will spend a large amount of time conventionally.

Summary of the invention

In order to overcome above-mentioned the deficiencies in the prior art part, the utility model provides a kind of laser metal apparatus for measuring linear expansion coefficient, can obtain larger optical lever long-armed, can reduce the complicacy of mechanical mechanism, and measures conveniently.

The utility model is achieved by the following technical solution: a kind of laser metal apparatus for measuring linear expansion coefficient, it comprises metal tube, heating wire, heat dissipating housing, laser optical lever, meter ruler, slide calliper rule, thermometer, workbench and scale.This device is characterised in that: described laser optical lever comprises a linear laser generator and a level crossing, the two ends of level crossing are fixed with respectively two front toes and rear toe, two toes are above placed in the groove of line dilatometer cover plate, and rear toe is placed in pipe end.Scale is vertical with linear laser generator away from workbench.

Principle of the present utility model is: adopt a linear laser generator as light source, do not need just direct reading on instrument of telescope, regulate the sharp direction of light of laser emitting parallel with workbench, the laser of ejaculation is beaten and on level crossing, is reflexed on scale at a distance again.Like this, the optical lever arm lengths in device does not reduce, but survey measurements is more convenient, and precision is higher.When metal tube expanded by heating to be measured extends, by optical lever, drive the deflection of level crossing generation certain angle, the light that now laser instrument sends drops on scale glazing through reflection and names a person for a particular job and move down, recording spot moves the scale of front and back respectively, thereby calculate metal tube small elongation now, by the linear expansion coefficient that further calculates metal tube.

The beneficial effects of the utility model are: saved telescope, simple in structure, production cost is low.Before and after can extending by measurement metal tube directly perceived, the elongation of the range determination metal tube of laser spot, be conducive to simplify experimental implementation step, and it is long-armed to obtain larger optical lever, and it is convenient, accurate to measure.

Accompanying drawing explanation

Accompanying drawing 1 is side view of the present utility model.

Accompanying drawing 2 is outside drawings of linear expansion coefficient analyzer.

Accompanying drawing 3 is measuring principle figure of the present utility model.

Embodiment

Please refer to shown in Fig. 1, Fig. 2, Fig. 3, Fig. 1 is side view of the present utility model; Fig. 2 is the outside drawing of linear expansion coefficient analyzer; Fig. 3 is measuring principle figure of the present utility model.Described a kind of laser metal apparatus for measuring linear expansion coefficient (1), it comprises apparatus for measuring linear expansion coefficient main body (2), thermometer (3), heating wire (4), metal tube (5), heat dissipating housing (6), laser optical lever (7), level crossing (8), laser instrument (9), scale (10) and workbench (11).This device is characterised in that: described heat dissipating housing (6) is placed in metal tube (5) and is wrapped in heating wire (4) to heating wire (4) cooling, described laser optical lever (7) comprises a level crossing (8) and a laser instrument (9), the two ends of level crossing (8) are fixed with respectively front toe and rear toe, two toes are above placed in the groove of line dilatometer cover plate, and rear toe is placed in metal tube (5) end.Scale (10) is vertical with laser instrument (9) away from workbench (11).

Measuring principle and method are as follows: apparatus for measuring linear expansion coefficient main body (2) and scale (10), laser instrument (9) is separated, and distance is in 1.5m left and right, and scale (10) is vertical with laser instrument (9).Open laser instrument (9) power supply, laser instrument (9) sends a horizontal thin light, beats at optical lever level crossing (8) above certain the position A beating at scale shown in Fig. 3 (10) through reflection.The built-in metal tube to be measured of apparatus for measuring linear expansion coefficient (5), outsourcing is with heating wire (4), after energising heating wire (4) to metal tube (5) heating, metal tube (5) elongation of expanding.Optical lever level crossing (8) metapedes spur is placed in metal tube (5) end, and another two front foot spurs are placed in the groove of line dilatometer cover plate, and after heating, metal tube (4) extends Δ L, level crossing (8) will under turn over θ angle.The thin light that laser instrument (9) sends can be beaten the B place, another location at scale (10) through reflection, the distance N that laser spot shown in record diagram 3 moves at the upper AB point-to-point transmission of scale (10).Suppose that D is the distance that optical lever level crossing (8) arrives scale (10), b is that after optical lever, toe, to the vertical range of front toe, has index path shown in Fig. 3 to obtain

$\mathrm{\ΔL}=\frac{\mathrm{Nb}}{2D}$

Thus, linear expansion coefficient is $\mathrm{\&alpha;}=\frac{\mathrm{\&Delta;L}}{\mathrm{L\&Delta;t}}=\frac{\mathrm{<figure-callout\; id="2"\; label="Nb"\; filenames="HSA00000905124100011.png"\; state="\{\{state\}\}">Nb</figure-callout>}}{2\mathrm{DL}(t_2-t_1)}$

T wherein ₁temperature while not heating, t ₂be the temperature after heating, L is the length of metal tube (5) while not heating.Can use Graphical Method linear expansion coefficient α.

Claims (1)

1. a laser metal apparatus for measuring linear expansion coefficient, it comprises metal tube (3), heating wire (2), heat dissipating housing (4), laser optical lever, thermometer (1), workbench (8) and scale (7), it is characterized in that: described laser optical lever comprises a linear laser generator (6) and a level crossing (5), the two ends of level crossing (5) are fixed with respectively front toe and rear toe, two toes are above placed in the groove of line dilatometer cover plate, rear toe is placed in metal tube (3) end, and scale (7) is vertical with linear laser generator (6) away from workbench (8).

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