CN202372144U - Tiny length measuring device based on imaging light reflecting and converging lever system - Google Patents

Abstract

The utility model relates to a tiny length measuring device based on an imaging light reflecting and converging lever system. The device comprises a base, front support legs and a rear support leg which are arranged on the base, and a lens arranged on the base, wherein the lens is a combined lens comprising a reflector and a focusing lens arranged in front of the reflector. According to the device disclosed by the utility model, the combined lens is formed by the reflector and the focusing lens, emergent rays are projected onto a scaleplate after being focused by the focusing lens so as to overcome the problem of scattering of light emitted by a light source and facilitate an operator to read precisely, the tiny elongation of a metal wire is measured more precisely, and the operation is easier.

Description

Be converged to the tiny length measurement mechanism of picture optical lever system based on reflection

Technical field

The utility model belongs to the physical experiment apparatus technical field, relates in particular to a kind of measurement mechanism that is used to measure tinsel microdeformation amount.

Background technology

In engineering and scientific experiment; Often need to measure the tiny length variable quantity, as measure Young modulus wiry and the linear expansion coefficient of measuring metal bar etc., the normal method that adopts is that specular light lever mated milscale is measured in the measurement; The specular light lever is at telescope of light source installed beside; The light source front is provided with ruler, and the ruler opposite is provided with a mirror, and optical lever one supporting leg links to each other with determinand; Through being adjusted at the picture of ruler in mirror of seeing in the telescope, thereby draw the length variations amount.But, when surveying Young's modulus of elasticity wiry, because the value of its elongation Δ L is very little; About 10-1mm order of magnitude, thus the measurement of Δ L normally the scale in the telescopic observation catoptron change, and obtain the tinsel length variations through the change in location of measuring picture; In use; Telescopic system very easily damages, and range of telescope is little, parallax is big, and is all comparatively difficult in adjusting and measuring process.And also there is the expensive deficiency of this set of equipments in optical lever telescope chi group.

In order to address the above problem; The patent No. is that 200620110633.9 Chinese utility model patent discloses a kind of optical lever device that adopts the laser measurement tiny length; It comprises " T " shape support; Be arranged on first toe, second toe and the 3rd toe of " T " shape support bottom, at the laser instrument that the top of " T " shape support is provided with governor motion and is connected with governor motion, the laser projections that laser instrument sends is on the ruler in light-emitting line the place ahead; Read the reading on the ruler, measure the variation of tiny length through calculating.But because commercially available laser instrument institute emitted light beams is not proper directional light; It still has significantly disperses, and when far away more apart from ruler, the hot spot that on ruler, forms is big more; Be difficult to confirm the center of hot spot during measurement, thereby the precision of measurement is reduced greatly.

Summary of the invention

The problem that the purpose of the utility model is overcome that existing optical lever telescope measuring system exists fragile, the visual field is little, parallax is big and be difficult for adjusting in measuring process; A kind of novel tiny length measurement mechanism is provided; It utilizes optical reflection and optical convergence's image-forming principle; Change telescope observation into catoptric imaging optical lever amplification system, make the measurement of the small elongation of tinsel more accurate, operate simpler.

To achieve these goals, the utility model is taked following technical solution:

Be converged to the tiny length measurement mechanism of picture optical lever system based on reflection, comprise: base, be arranged at front leg strut and rear support leg on the base, be arranged at the eyeglass on the base; This eyeglass is the combined lens of the condenser lens before comprising catoptron and being located at said catoptron.

The utility model base is provided with the mirror holder that eyeglass is installed, and is provided with trimming bolt between mirror holder and the base.

The mirror holder of the utility model comprises support and is arranged at the left side arm and the right arm at support two ends, is processed with the groove that is used to install eyeglass in the relative inner of left side arm and right arm.

Left side arm of the utility model and right arm can relative to support level move in opposite directions or each other away from.

The rack upper surface of the utility model is processed with and side arm upper groove position corresponding groove.

Know that by above the utility model adopts catoptron to become combined lens with focus lens group, just be incident upon on the scale after by condenser lens emergent ray being focused on; Overcome the problem of the light scattering that light source sends; The operating personnel's pin-point reading of being more convenient for is measured more accurately, operates simpler.

Description of drawings

Fig. 1 is the front view of the utility model;

Fig. 2 is the vertical view of Fig. 1;

Fig. 3 is the measuring principle figure of the utility model.

Below in conjunction with accompanying drawing the embodiment of the utility model is done explanation in further detail.

Embodiment

Like Fig. 1 and shown in Figure 2, the measurement mechanism of present embodiment comprises base 1, front leg strut 2, rear support leg 3, trimming bolt 4, mirror holder 5 and combined lens, and this combined lens comprises catoptron 6 and condenser lens 7.Be provided with a pair of front leg strut 2 in base 1 bottom; Base 1 rear portion is equipped with the rear support leg 3 that extends back; Base 1 top is provided with mirror holder 5; Between mirror holder 5 and base 1, be provided with trimming bolt 4, mirror holder 5 moved up and down, thereby the position of mirror holder 5 in the vertical directions is finely tuned through rotary fine adjustment bolt 4.Catoptron 6 and condenser lens 7 are installed on the mirror holder 5, and condenser lens 7 is positioned at the place ahead of catoptron 6, and promptly the light that sends of light source is earlier through mirror 6 reflections that are reflected behind the condenser lens 7, again by condenser lens 7 with convergence of rays.As the utility model optimized technical scheme; The left and right sides width-adjustable joint of mirror holder 5, as shown in Figure 1, mirror holder 5 comprises support 5a, left side arm 5b and right arm 5c; Left side arm 5b and right arm 5c are L-shaped; The nested respectively two ends that are installed in support 5a, left side arm 5a and right arm 5c can move or are provided with a cover screw rod swivel nut parallel moving mechanism away from, support 5a each other relative to support 5a level in opposite directions; This screw rod swivel nut parallel moving mechanism is used to control the translation of left side arm 5b and right arm 5c; This screw rod swivel nut parallel moving mechanism is the conventional design in the Machine Design, regulates the screw knob bolt swivel nut inner with being fixed on support 5a by displacement and constitutes, and the distance between the left and right side arm also can directly save with hand adjustment.Through regulating the distance between the left and right side arm; Can change the eyeglass of different size easily, in addition, be processed with the groove a that is used to install eyeglass in the relative inner of left side arm 5b and right arm 5c; Equally, also can process the groove that is used to place eyeglass in the relevant position of support 5a upper surface.

With reference to Fig. 3, parallel light tube 100, promptly light source levels is positioned over the n of scale 200 ₀The position; Measurement mechanism is positioned at scale 200 1 sides; Can regulate trimming bolt 4 earlier before measuring, the minute surface normal of combined lens emitted beam with parallel light tube 100 overlap, the minute surface M and the distance between the scale 200 of catoptron 6 are D; The focal length of condenser lens 7 also is D, and the distance of 2 lines of rear support leg 3 to two front leg struts is b.Tinsel to be measured is hung on the support, and the upper end is fixed on the rear support leg 3, and the lower end adds counterweight to the tinsel application of force.

During measurement, light beam is by parallel light tube 100 outgoing, through catoptron 6 reflections, by being radiated on the transparent scale 200 after condenser lens 7 convergences.Because during beginning, the normal of minute surface M just in time is a level, the light that then sends from parallel light tube 100 overlaps with minute surface normal M, and reflexes to the n on the scale 200 ₀The place; When tinsel was extended Δ L, rear support leg 3 rotated the θ angle with tinsel whereabouts Δ L thereby drive combined lens, and postrotational minute surface normal is designated as M ', according to the light reflection law, and light on ₀And the angle between light on is 2 θ, then has

$\mathrm{tg\&theta;}=\frac{\mathrm{\&Delta;L}}{b};$ $\mathrm{<figure-callout\; id="2"\; label="tg"\; filenames="HDA0000123183620000011.png,HDA0000123183620000021.png"\; state="\{\{state\}\}">tg</figure-callout>}2\mathrm{\&theta;}=\frac{n-n_0}{D}$

Because θ is very little, so,

$\mathrm{\&theta;}=\frac{\mathrm{\&Delta;L}}{b};$ $2\mathrm{\&theta;}=\frac{n-n_0}{D}$

Cancellation θ,

$\mathrm{\&Delta;L}=\frac{\left({n-n}_0\right)b}{2D}=\frac{b}{2D}\mathrm{\&Delta;n}$ (n-n ₀＝Δn)

Wherein, D is the distance between mirror surface and scale, and b is the distance of 2 lines of rear support leg 3 to two front leg struts, n ₀Be the reading of initial position on the scale, n is incident upon the reading on the scale after the minute surface rotation.

Certainly; Above embodiment only in order to the explanation the utility model technical scheme but not to its restriction; Although with reference to the foregoing description the utility model has been carried out detailed explanation, the those of ordinary skill in affiliated field should be appreciated that still and can make amendment or be equal to replacement the embodiment of the utility model; And do not break away from any modification of the utility model spirit and scope or be equal to replacement, it all should be encompassed among the claim scope of the utility model.

Claims (5)

1. be converged to the tiny length measurement mechanism of picture optical lever system based on reflection, comprise: base, be arranged at front leg strut and rear support leg on the base, be arranged at the eyeglass on the base; It is characterized in that: said eyeglass is the combined lens of the condenser lens before comprising catoptron and being located at said catoptron.

2. according to claim 1ly be converged to the tiny length measurement mechanism of picture optical lever system based on reflection, it is characterized in that: said base is provided with the mirror holder that eyeglass is installed, and is provided with trimming bolt between said mirror holder and the base.

3. the tiny length measurement mechanism that is converged to the picture optical lever system based on reflection according to claim 2; It is characterized in that: said mirror holder comprises support and is arranged at the left side arm and the right arm at support two ends, is processed with the groove that is used to install eyeglass in the relative inner of said left side arm and right arm.

4. according to claim 3 based on reflection be converged to the picture optical lever system the tiny length measurement mechanism, it is characterized in that: said left side arm and right arm can relative to said support level move in opposite directions or each other away from.

5. according to claim 3 based on reflection be converged to the picture optical lever system the tiny length measurement mechanism, it is characterized in that: said rack upper surface is processed with and said side arm upper groove position corresponding groove.

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