CN201277948Y - Instrument for accurately measuring refraction of micro fluid - Google Patents

Abstract

The utility model relates to an optical measuring instrument utilizing liquid refractive index to analyze materials. The optical measuring instrument is provided with a light source 1, a short-focus lens 2, a slit 3 and a capillary 4 which are sequentially arranged inside a component 10 which can make translation along a slide bar 9; the component 10 can make straight reciprocating motion along the slide bar 9 under the action of a spiral micrometer 7; a CMOS two-dimensional array sensor and an achromatic object lens 5 are sequentially fixed in a component 11; the component 11 is fixedly connected with a soleplate 12; the CMOS two-dimensional array sensor is connected with a computer through an interface circuit; the image of the focal line in front of the object lens is displayed on the screen of the computer; and the component 10 and the component 11 satisfy the optical coaxial condition. In the utility model, the kinematic pair components are in rigid connection and have compact structure, high measuring precision and low energy consumption. The utility model provides a practical and fast instrument.

Description

A kind of instrument of accurate measuring trace quantity liquid refractivity

Technical field

The utility model belongs to optical instrument, particularly relates to the optical gauge that utilizes liquid refractivity to come analysis of material.

Background technology

Refractive index is one of important physical parameter of material, all needs to measure the character that liquid refractivity comes analysis of material in many experiments such as biology, chemistry, Material Physics and optics.All volatile or moisture-sensitive is polluted and influence the accuracy of measuring owing to general liquid, and some chemical constitution has toxicity or corrosivity and causes surveying work inconvenient greatly.For exploring the measuring method of easy liquid refractivity accurately, in July, 2007, we proposed " a kind of method of accurate trace measurement liquid refractivity " (Chinese invention patent application number 2007100660162), this method is adjusted in each individual components on the optical table, by kapillary inner and outer diameter and the refractive index of formerly determining thereof, artificial reading and experiment with computing result, it has in theory successfully proposed a kind of new measuring method, and has finished theoretical premise of the present utility model and condition in the laboratory.But as experimental provision, it is still needed and uses the microscope monocular observation, and the vision face is narrower, may produce certain deviation, and each relative motion part of mechanism is not also formed the member of single whole mechanism, thereby also is not to have the instrument that industrialization is produced.

Summary of the invention

The purpose of this utility model is intended to the general measuring method that " a kind of method of accurate trace measurement liquid refractivity " proposes is further risen to concrete surveying instrument, the physical construction of optical component of relative motion provides support, get rid of astable factor, realize its commercialization, to reach the purpose of measuring liquid refractivity accurately and easily.

The utility model purpose realizes by following scheme:

(1) light source 1, short focus lens 2, slit 3, kapillary 4 places successively can be along in the member 10 of slide bar 9 translations, member 10 is dragged by screw-thread micrometer 7 and moves along slide bar 9 toward complex lines;

(2) in the fixed component 11, member 11 is fixedlyed connected with base plate 12 successively for CMOS two-dimensional array sensor and achromatic object lens 5, and the CMOS two-dimensional array sensor is connected with computing machine by interface circuit, and the picture of object lens anterior focal line is presented on the computer screen;

Member 10 satisfies the coaxial condition of optics with member 11.

Be provided with the catoptron 8 of 45 ° of placements between described short focus lens 2 and the slit 3, the light beam of light source 1 is penetrated from the rectangular direction of axle with member 10.

Described light source 1 adopts the spectral characteristic peak wavelength to be about 580nm, or with the close light emitting diode of spectral characteristic peak wavelength 70nm-600nm of the yellow two-wire of sodium.

Described have a slit patchhole on member 10, slit 3 is adhesive film type slit 5mm, that have a series of width for thickness is about.

Described have kapillary 4 patchholes on member 10, its patchhole upper and lower side gummed rubber sleeve.

The enlargement ratio 10 of described object lens 5 or 20 times, numerical aperture 0.25 or 0.4.

Described CCD adopts 640 * 480 array distribution of band USB2.0 interface, the CMOS two-dimensional array sensor of the colored output of RGB standard.

The utility model is embodied as single whole mechanism with the general measuring method that " a kind of method of accurate trace measurement liquid refractivity " proposes, promptly has the physical construction of supporting the optical component relative motion, finish with computer and to observe and measurement obtains the instrument of result of calculation, it is cheap, and has reached the intended purposes of measuring liquid refractivity comparatively exactly and easily.

The utlity model has following beneficial effect:

1, each kinematic pair member is for being rigidly connected, the compact mechanical structure of optical component, and industrial production cost is low, reliable in quality, stable performance.

2, the actual enlargement ratio of video output system formed of object lens and CCD is much larger than 100 times, and the depth of field is less than 0.009mm, the measuring accuracy height; And select for use the kapillary of suitable parameters, more accurate displacement measuring device, the high-resolution CCD of healing to obtain higher measuring accuracy.

3, the LED of the low-power that use cost is cheap, long-life, wavelength 580nm is as lighting source; LED adopts button cell, or lithium ion chargeable battery, or the USB power supply, and energy consumption is low.

Description of drawings

Fig. 1 is the utility model measuring principle figure.Wherein, the clear profile diagram of Fig. 1 a kapillary, Fig. 1 b kapillary focal line figure.

Fig. 2 is the utility model light emitting diode spectral characteristic synoptic diagram, and its peak wavelength is 580nm.。

Fig. 3 is the utility model structural representation.

Fig. 4 is the utility model index path, comprising: light source 1, short focus lens 2, slit 3, kapillary 4, object lens 5, ccd sensor 6, spiral dial gauge 7, catoptron 8, slide bar 9, member 10, member 11, base plate 12.

Below in conjunction with drawings and Examples, the utility model is described further.

Embodiment

(1) the utility model embodiment and principle of work

(1) shown in Fig. 3,4, be light source 1 with the light emitting diode, with light beam by short focus lens 2 from drawing with the rectangular direction of axle of member 10, after 8 reflections of catoptron through being provided with the miter angle placement between too short focus lens 2 and the slit 3, pass slit 3 and be radiated on the kapillary that fills testing liquid again.Wherein, light source 1 is a light emitting diode, this is to be that the yellow two-wire measurement result of sodium of sodium yellow line II of 589.6nm is as its standard value because material refractive index often is 589.0nm sodium yellow line I and wavelength with the wavelength, and the peak wavelength of the spectral characteristic of light emitting diode is 580nm, and is very approaching with the refractive index and the standard value of this material that records.Become the directional light of vertical direction behind the optical alignment that short focus lens 2 sends LED; Catoptron 8 is fixed on the member 10 reflection dressing tables with 45.Slit 3 is the adhesive film type slit of thickness 5mm, its role is to limit non-paraxial light, satisfy parallel paraxial condition from the light of slit outgoing, through converging to the kapillary rear behind the kapillary that fills testing liquid, form a focal line, have a series of adhesive film type slits 3 of different in width value for this reason, can adjust the far and near width of slit as required and change by the slit patchhole on the member 10.Kapillary 4 is a length 20mm cylindrical tube, and every cover instrument can be worn 8 kapillaries that length is the same.

Above light source 1, short focus lens 2, catoptron 8, slit 3, kapillary 4 is arranged at can be along in the member 10 of slide bar 9 translations, and member 10 is dragged by screw-thread micrometer 7 and moves along slide bar 9 toward complex lines.

(2) in achromatic object lens 5 and CMOS two-dimensional array sensor fixed component 11 successively, member 11 is fixedlyed connected with base plate 12, and wherein, object lens are the achromatism structure, 10 times of enlargement ratios, and numerical aperture is 0.25.The CMOS two-dimensional array sensor is 640 * 480 array distribution of band USB2.0 interface, the sensor of the colored output of RGB standard, and is connected with computing machine, thereby the picture of object lens anterior focal line is presented on the computer screen, as Fig. 1.

(2) with the utility model apparatus measures water, ethanol, ethylene glycol and glycerine liquid refractive index and result thereof

1, adjust: each element of adjusting light path makes it to satisfy coaxial condition; Adjust the position of screw-thread micrometer on support, make when the reading of screw-thread micrometer is zero, on computer screen, just in time observe the extracapillary profile the most clearly as (as shown in Figure 1a), promptly demarcate position d at this moment ₁Be coordinate zero point;

2. measure: the knob of rotating screw micrometer, make to be loaded with parts 2 capillaceous, can see that on computer screen a bright line forms gradually, continue the rotating screw micrometer away from parts 1, the brightest when the narrowest (shown in Fig. 1 b) up to bright line, the reading d of screw-thread micrometer ₂, d=d is then arranged ₂-d ₁Repeatedly measure the mean value d and the standard deviation of trying to achieve d _d, the substitution formula $n=\frac{2R{n}_{0}d}{2d(R-r)+2n_0\mathrm{dr}-n_0\mathrm{Rr}}$ With ${\mathrm{\σ}}_n=\frac{2n_0^2{R}^{2}r}{{[2d(R-r)+2n_0\mathrm{dr}-n_0\mathrm{Rr}]}^2}\left|{\mathrm{\σ}}_d\right|$ In, the refractive index and the standard deviation thereof of calculating testing liquid;

3. measurement result and contrast:

Claims (7)

1. the instrument of an accurate measuring trace quantity liquid refractivity is characterized in that:

Light source (1), short focus lens (2), slit (3), kapillary (4) places successively can be along in the member (10) of slide bar (9) translation, and member (10) is dragged by screw-thread micrometer (7) and moves along slide bar (9) toward complex line;

CMOS two-dimensional array sensor and achromatic object lens 5 are successively in the fixed component (11), member (11) is fixedlyed connected with base plate (12), the CMOS two-dimensional array sensor is connected with computing machine by interface circuit, and the picture of object lens anterior focal line is presented on the computer screen;

Member (10) satisfies the coaxial condition of optics with member (11).

2. the instrument of a kind of accurate measuring trace quantity liquid refractivity according to claim 1, it is characterized in that being provided with the catoptron (8) that 45 is placed between short focus lens (2) and the slit (3), the light beam of light source (1) is penetrated from the rectangular direction of axle with member (10).

3. the instrument of a kind of accurate measuring trace quantity liquid refractivity according to claim 1 is characterized in that light source (1) adopts the spectral characteristic peak wavelength to be about 580nm, or with the close light emitting diode of the spectral characteristic peak wavelength 570nm-600nm of the yellow two-wire of sodium.

4. the instrument of a kind of accurate measuring trace quantity liquid refractivity according to claim 1 is characterized in that on member (10) the slit patchhole being arranged, and slit (3) is about 5mm, has the adhesive film type slit of a series of width for thickness.

5. the instrument of a kind of accurate measuring trace quantity liquid refractivity according to claim 1 is characterized in that kapillary (4) patchhole is arranged on member (10), its patchhole upper and lower side gummed rubber sleeve.

6. the instrument of a kind of accurate measuring trace quantity liquid refractivity according to claim 1 is characterized in that the enlargement ratio 10 of object lens (5) or 20 times, numerical aperture 0.25 or 0.4.

7. the instrument of a kind of accurate measuring trace quantity liquid refractivity according to claim 1 is characterized in that CCD adopts 640 * 480 array distribution of band USB2.0 interface, the CMOS two-dimensional array sensor of the colored output of RGB standard.

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