CN2055935U - Slit micro-absorption cell in spectrophotometer - Google Patents

Abstract

The utility model discloses a slit micro-absorption cell in a spectrophotometer. A light splitting slit and an absorption cell in a spectrophotometer are combined together. The slit micro-absorption cell is composed of a pulling handle, a slit micro-absorption cell, a fixed slot and a sliding slot. The slit micro-absorption cell has the function of the light splitting slit and also has the characteristic of the micro-absorption cell. The utility model solves the problem of the sample micro of the spectrophotometry from a principle. The light quantity is enlarged. The slit micro-absorption cell has a pronounced superiority for the measuring work which needs to reduce sampling quantity and the measuring work for some rare samples.

Description

Slit micro-absorption cell in spectrophotometer

The application of spectrophotometer in chemical analysis is very extensive, and the utility model relates to the little absorption cell of slit in a kind of spectrophotometer.

Existing spectrophotometric minute optical slits and absorption cell are separately independently, in its light path, generally by twice focusing.To the measurement of micro-example the time, it is very undesirable.Because the little absorption cell of volume generally is that two walls are transparent by glass or quartzy the making at present, this just requires the focusing of instrument extremely accurate, and the position in pond is extremely correct.Otherwise, thereby incident light will be beaten on the pool wall or can not be radiated on the absorption cell fully and make the mistake.Simultaneously, the reflection of pool wall also can bring measuring error.And the minute surface of catoptron and lens can lose the part light loss because of reflection, scattering, refraction; Huge absorption plant makes the space of incident light process very big, also can cause light loss.So, using little absorption cell, the measuring condition that satisfy above-mentioned harshness is difficult, this also is the major reason that spectrophotometer still can not be used microtechnique at present well.Present absorption cell generally once consumes sample 0.5ml～3ml, the nearly 5ml that has.When cleaning absorption cell, need it is taken out from the frame of pond, can the application of sample measurement after respectively cleaning twice with distilled water and liquid to be measured, as seen, the consumption of sample can not be ignored.

The purpose of this utility model is to avoid above-mentioned weak point of the prior art and the little absorption cell of slit that provides a kind of optical slot and absorption cell organically to combine.

Main points of the present utility model are in spectrophotometric optical channel, on the focal plane of collimating mirror, are provided with the little absorption cell of slit.That this device directly reflects back collimating mirror, have that monochromatic light with certain wavelength is included in and, measure by the sample liquid that it has.Simultaneously, because the needs of beam split, the width of the little absorption cell of slit and length are subjected to strict restriction, only can hold the sample liquid of several ul to tens ul, thereby become little absorption cell of injection application of sample.

The utility model has significant advantage compared to existing technology, and it has reduced the volume of absorption cell greatly, and single injected sampling only needs 5ul～50ul, and the saving amount of sample is conspicuous.It has not only remedied ubiquitous shortcoming in the existing spectrophotometer, and because the two side of the little absorption cell of slit is material with the welding glass, simplify existing spectrophotometric absorption plant and light path element greatly, overcome the suffered measurement restrictive condition of general little absorption cell.The utility model has also increased measurement range, can measure various concentration.Especially for the concentration height, the sample that sample size is few has more remarkable advantages.The system of slit and little absorption cell and be one has been simplified the Instrument assembly device, has increased luminous flux to a certain extent, helps the raising of sensitivity.The utility model has been used microtechnique fruitfully in spectrophotometer, make instrument become possibility by sample introduction to measuring whole robotizations.In addition, the capacity of little absorption cell is little, and light path is very short, makes the light absorption value of high concentration material measure more accurate data presentation.

The drawing of accompanying drawing of the present utility model is described as follows:

Fig. 1 is the spectrophotometric optical system that is provided with the little absorption cell of slit.Wherein 1 is illuminator, the 2nd, and light inlet slot, the 3rd, catoptron, the 4th, collector lens, the 5th, dispersing prism, the 6th, collimating mirror, the 7th, cover glass, the 8th, the little absorption cell device of slit, the 9th, optical gate, the 10th, cover glass, the 11st, photoelectric tube.Fig. 2 is the spectrophotometer that is provided with the little absorption cell of slit.Wherein 12 is that reading shows, the 13rd, and wavelength demonstration, the 14th, pull handle, the 15th, the little absorption cell of slit, the 16th, the little absorption cell stationary installation of slit, the 17th, collecting tank conduit, the 18th, fixed screw, the 19th, optical gate switch, the 20th, light source switch, the 21st, light source pilot lamp.

Fig. 3 is the structural representation of the little absorption cell of slit.Wherein 22 is pull handles, the 23rd, and the little absorption cell of slit, the 24th, the pickup groove of the little absorption cell of slit, the 25th, the sliding channel of the little absorption cell of slit.

Fig. 4 is the little absorption cell pickup groove of a slit vertical view (removing shell).Wherein 26 is fixing plush coppers, the 27th, and spring, the 28th, fixed head.

Fig. 5 is a collecting tank.The utility model is described in further detail below in conjunction with accompanying drawing: shown in Fig. 2,3, the little absorption cell of slit (15) is fixed on the level and smooth pond frame of spectrophotometer, and the stationary installation of its slip (16) plays a part the transposing little absorption cell of slit and makes its stationkeeping.Fixed screw (18) is fixed on the spectrophotometer bottom with the little absorption cell stationary installation of slit (16).Below the little absorption cell device of slit, fixing collecting tank (Fig. 5), the little absorption cell stationary installation of the import center of collecting tank and slit fixes, i.e. two fixing center line consistencies from top to bottom of the little absorption cell of slit in the middle of the plush copper (26), when after mensuration, all flowing into collecting tank (Fig. 5) working sample, sample is injected different rubber plugs with reference liquid respectively with different micro syringes enter the little absorption cell of slit with the solution that guarantees the little absorption cell of slit.Mobile pull handle (22) thus make reference and the little absorption cell of the slit at sample place to move to the measuring position all measured.When cleaning absorption cell, with air the solution in the little absorption cell of slit is blown out earlier, flow to collecting tank (Fig. 5), be injected into distilled water and sample then, directly clean, its effect is excellent.

As shown in Figure 3, the two side of the little absorption cell of slit makes of welding glass, and two absorption surfaces that light path is passed through are made with quartz, and both are bonded together with high performance adhesive.The pickup groove of the little absorption cell of slit (24) is made into hemispheric recessed deeply, can very critically coincide with fixing plush copper (26).Fixedly plush copper is made with glass bead and is got final product, outside polishing.The height of the little absorption cell of slit is between 10mm～30mm, and length is 1～4mm, and the width of the little absorption cell of slit is less than or equal to 2mm.Preferable size is selected high 20mm, long 2mm, and wide 0.5mm, its capacity are 20mm*2mm*0.5mm=20ul.Be enough to satisfy the requirement of microtechnique.The little absorption cell of slit can be made into different width and length, and device is in the carrier of the different little absorption cells of slit, so that it is changed when needing.

Claims (3)

1, a kind of narrow little absorption cell that is used for spectrophotometer, form by pull handle (22), the little absorption cell of slit (23), pickup groove (24), sliding channel (25), the two side that it is characterized in that the little absorption cell of said slit makes of welding glass, two absorption surfaces that light path is passed through are made of quartzy, with high performance adhesive two side and two absorption surfaces are bonded together, the length of the little absorption cell of slit=1～4mm, wide＜=2mm, height=10～30mm.

2, the little absorption cell of slit according to claim 1, the optimum dimension that it is characterized in that it is length=2mm, and is wide=0.5mm, height=20mm.

3, according to claim 1, the little absorption cell of 2 described slits, it is characterized in that said pickup groove (24) makes hemispheric recessedly deeply, fixedly plush copper (26) is made of the glass bead of polishing.

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