CN201637630U - Integrated Laser Young's Modulus Meter - Google Patents

Abstract

The utility model discloses a all-in-one laser Young modulus detector which is a physical experiment instrument. By utilizing an optical lever principle, the tiny extension of a wire under the action of external force is converted into corresponding deflection of horizontal line laser emitted by a laser optical lever; and the horizontal line laser is projected on a ruler of a base platform after being reflected by a plane mirror at the top of the instrument, and the offset of a horizontal light ray is calibrated by the ruler, thereby directly reading the amplified tiny extension of the wire on the instrument. The detector has all-in-one design, overcomes the defects of difficult light path adjustment and remote reciprocating operation of the traditional Young modulus detector, can be independently and conveniently used for test by a single person and is beneficial to saving experiment space and experiment time.

Description

Integrated Laser Young's Modulus Meter

technical field

The utility model relates to a measuring instrument for Young's modulus of a physical experiment instrument, in particular to an experimental instrument for measuring the Young's modulus of metal by adopting the principle of an optical lever and using a stretching method.

Background technique

Young's modulus is an important physical parameter reflecting the mechanical properties of materials. The traditional stretching method for measuring the Young's modulus of metals uses the principle of optical levers to amplify the tiny elongation of metal wires through mirror optical levers and observe them through telescopes and scales placed far away. But in the actual operation process, it is not easy to find the scale image reflected by the optical lever plane mirror in the telescope, and the experimenter often needs to spend a lot of time to adjust the instrument. In addition, there is a certain distance between the telescope and the Young's modulus meter. During the operation, one person needs to increase or decrease the weight at the instrument, another person observes and records data at the telescope, or one person runs back and forth between the instrument and the telescope, so it is impossible to Experimental measurements are done independently and conveniently.

Utility model content

The technical problem to be solved by the utility model is to provide an integrated Young's modulus measuring instrument with more convenient adjustment and operation, which can directly measure the tiny elongation of the metal wire amplified by the principle of optical levers in the Young's modulus read out on the tester.

In order to solve the above-mentioned technical problems, the integrated laser Young's modulus tester of the present invention has made the following improvements to the optical lever and optical path of the traditional Young's modulus tester: replace the flat mirror with an inline laser and install it on the T-shaped frame Constitute the laser light lever, the laser emits a line of laser vertically upwards, after being reflected by the plane mirror fixed on the beam of the upper bracket of the instrument, it is projected on the scale fixed on the optical lever platform directly below the plane mirror, using the line as the scale Reading line. When the metal wire is slightly elongated under the action of external force, the light beam is driven by the laser light lever to make a small deflection, which is converted into the change of the scale reading after being reflected by the plane mirror, so as to measure the small elongation of the metal wire, and thus Further calculate the Young's modulus of the material.

Because the utility model adopts the above-mentioned integrated design, the utility model has a simple structure, can directly read on the instrument without a telescope, and can conduct experiments independently and conveniently by a single person, which is conducive to simplifying experimental operations and saving experimental space and experimental time.

Description of drawings

The utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a side view of the utility model

Fig. 2 is the front view of the utility model

Figure 3 is a perspective view of the laser light lever

Fig. 4 is the measurement schematic diagram of the utility model

Detailed ways

The integrated laser Young's modulus measuring instrument shown in Fig. 1 and Fig. 2 is composed of a bracket 1, a metal wire with upper and lower chucks 2 (lower chuck 7), a laser light lever 3, a plane mirror 4, a scale 5, and a base platform 6 , the plane mirror 4 is fixed on the crossbeam of the upper bracket 1 of the instrument with the mirror face down, and the scale 5 is facing the plane mirror 4 and installed on the same side of the laser light lever 3 on the base 6 .

The laser optical lever shown in Fig. 3 is made up of T-shaped frame 11 and inline laser 8, two front feet 10 of T-shaped frame 11 and rear foot 9 are equal in height, and laser device 8 is perpendicular to the plane where T-shaped frame 11 three toes are located, and laser device 8 The inclination of the straight-line light emitted can be fine-tuned.

Its measurement principle and measurement method are as follows:

Referring to Fig. 1 and Fig. 2, put the rear toe 9 of the T-shaped frame 11 on the lower chuck 7 clamping the wire, put the two front toes 10 on the base platform 6, turn on the power of the laser, and make the laser 8 vertical Sent upwards the inline thin light, reflected by the plane mirror 4 to the m place of the scale 5 in Fig. 4, the inline is used as the reading mark of the scale, and the position of the T-shaped frame 11 and the inclination of the inline light that the laser 8 sends are fine-tuned. Make the one-line laser parallel to the scale line. When the metal wire 2 is slightly elongated by ΔL under the action of tension, the rear leg of the optical lever descends by ΔL with the metal wire chuck, driving the laser 8 to rotate through a small angle α, and the incident angle of the laser beam to the plane mirror 4 also rotates α accordingly. Then the light hits the point p of the scale 5 in Figure 4, and the moving distance N of the light on the scale can be measured from the reading difference between m and p.

Suppose the vertical distance between the rear foot 9 of the light lever and the line connecting the two front feet 10 is K, and the distance from the scale 5 to the plane mirror 4 is D, and the optical path in Fig. 4 is obtained:

$\mathrm{<span\; class="notranslate">\; the\; tan</span>}\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&Delta;L</span>}}{\mathrm{<span\; class="notranslate">\; K</span>}}$ $\mathrm{<span\; class="notranslate">\; the\; tan</span>}\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; N</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; D.</span>}}$

so, $\frac{N/2}{\mathrm{D.}}=\frac{\mathrm{\&Delta;\; L}}{K},$

The tiny elongation of the metal wire is thus measured as

$\mathrm{<span\; class="notranslate">\; \&Delta;\; L</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; KN</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; D.</span>}}$

The rest of the measurement and calculation methods are the same as the conventional Young's modulus experiment.

Claims (3)

1. one-piece type laser measure apparatus of youngs modulus, by support (1), with upward tinsel (2), laser light lever (3), level crossing (4), scale (5), the base platform (6) of lower chuck are formed, laser light lever (3) is made up of laser instrument (8) and T shape frame (11), two front foots (10) and the metapedes (9) of T shape frame (11) are contour, it is characterized in that: level crossing (4) minute surface is fixed on the end support on the instrument (1) down, scale (5) and level crossing (4) over against and be installed in the homonymy that base platform (6) is gone up laser light lever (3).

2. according to the described one-piece type laser measure apparatus of youngs modulus of claim 1, it is characterized in that: described laser instrument (8) is a word line laser instrument, and the degree of tilt of the word light that it sends is fine-tuning.

3. according to the described one-piece type laser measure apparatus of youngs modulus of claim 1, it is characterized in that: described laser instrument (8) is vertical with plane, T shape frame (11) three toe place.

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