DE1923149U - SPECTROSCOPIC DEVICE. - Google Patents

Description

MO58380 6/29/65

Berlin, June 23, 1965 /

Utility model registration

Applicant: Company R. PUESS

1 Berlin 4I

Düntherstrasse 8

Spectroscopic device

There are known spectroscopic devices in which a quantitative Measurement of the spectral ranges, especially spectral lines, using ray tangs «· detectors, e.g. Phot © multiplier, takes place in such a way that the light intensity of these measuring areas is converted into electrical energy that is transferred to a Meter is displayed. Solehe devices are often used in spectral analysis Material examinations, e.g. metal tests, applied. As a rule, the material to be examined is electrically processed, ζ.Β « by spark transition, to which the spectral analytical evaluation enables Ray rod excited »

In the case of the known devices of this type, the intensity of the « The spectral ranges (spectral lines) to be measured are fixed, or that Spectrum is guided past a radiation detector (photomultiplier) in such a way that that a temporally continuous sampling takes place. Devices of the first type require a considerable expenditure of time if instead of those already set Other spectral ranges are to be recorded, with the instruments of the second type the exact assignment of the wavelengths causes difficulties «

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Bie Inventiang eliminates this disadvantage and in particular enables precise adjustment of the radiation detector at any time to one certain spectral measuring range ζ spectral line) even if only a single radiation detector is available, which can be arranged in any row » follow can be set to any range, either the The spectrum remains fixed and the detector is moved or the latter is fixed and the spectrum is moved *

According to the innovation, the beam guiding and fading out in the beam path « medium provided in the form of two opaque screens) between form a radiation passage in the full height of the spectrum, the rest However, obscure the field of view to an extent of its height

In a further embodiment of the hiring, a beam guidance » medium, e.g. a deflecting prism, is used, which increases the height of the to measuring spectral range at the same time with the files of the rest of the measuring range that are adjacent to this and are not masked by the radiation detector spectrum supplied to an eyepiece Close to that band of the measuring beam diaphragm, which is the full width clears the visible part of the measurement spectrum "

The relative position of the spectrum and the radiation detector is shown in the dispersion · » direction appropriately designed to be changeable by hand, 2.B * in such a way that the dispersant, preferably a sitter, is rotatably attached «This enables, for example, the use of only a single radiation detector, through which the intensity of each desired spectral range

(Spectral line) can be measured in any order, Bas The entire spectrum then migrates in the direction of dispersion at the masking means for the radiation detector along.

As the analysis radiation source, e.g. a through spark transition to radiation excited piece of metal to be examined, no uniform radiation intensity generated, it is recommended to provide a further radiation detector for the simultaneous measurement of a comparison intensity that the Sensitivity of the measuring beam detector with switching means known per se regulates in such a way that fluctuations in the intensity of the analysis radiation source are compensated *

Finally, for the simultaneous visual observation of the gate part, to generate an auxiliary spectrum in addition to the measurement spectrum, which is preferably in Close to the non-dimmed Eand of the measuring spectrum and, for example considered by the aforementioned deflecting prism together with the measurement spectrum it can be that identical lines of both spectra fall into the mutual extension "

It is recommended to further perfect the visual observation Finally, the usable spectrum beyond the visible range to extend out into the ultraviolet or infrared range or out « to make stretchable and to make these areas visible one or more W or. IR-sensitive converters - e.g. a fluorescent plate for W should be provided *

The drawing shows «· essentially schematically and for the better

Overview of changed proportions, especially shortened light paths <* an exemplary embodiment of the fire in several files and different views *

In Fig. 1 that is visible through the observation optics Field of view of the device shown,

Fig. 2 shows the arrangement of Fig. 1 rotated by $ 0 ° , that is, seen from the side,

Fig. 3 shows the overall arrangement of all means,

the generation of the measurement spectrum and a Yer «· lead equal intensity "

The field of view shown in FIG. 1 is limited by lines 1 and 2 running perpendicular to the spectrum. It reveals the actual measurement spectrum 3, for example a line spectrum. In the vicinity of the upper band of the measurement spectrum 5 in the drawing, an auxiliary spectrum 4 is also shown, which is derived from a reference material and is otherwise generated by the same conducting and dispersing means as the measurement spectrum 3 _t so that the same wavelengths, ie the same lines of the both spectra 3 and 4 are in mutual extension «

The masking means for the radiation detector are illustrated by two diaphragms 5 and β, which form a gap 7 lying parallel to the spectral lines.These diaphragms 5 and 6 extend in the line direction almost to the entire height of the measurement spectrum and only leave between their bands 8 and $ and the upper band of the measurement spectrum 3 in the drawing, an uncovered strip, so that at this point the area around the spectral line passing through the gap f or another spectral range is visible «

A beam guiding means in the form of a deflecting prism 10 is as check in particular apparent from Figure "2 for visual observation of this on the. Diaphragm edges 8 and $ visible part of the measured spectrum J is provided, of which the Reflexionsfläeae 15 limiting the lower band ti in the" saw the upper linder β or $ of the diaphragm 5 and 6 is' lie in FIG. 2 upper Lichtei ^ passage area of the fmlenkprismas 10 is an eyepiece opposite, so that the Meßspekstrums and the auxiliary spectrum is possible therethrough an observation of the light reflected at the surface visible feile Through the eyepiece 14, the observer also sees that spectral range or that spectral line which is blocked out by the diaphragm gap J as an extension downwards, up to the level of the lower edge 11 of this reflection surface , besides the filing left free by the wretches 5 and 6, the area around the measured line is also special highlighted, ie extended downwards, to consider and compare the essential areas or lines of the measurement spectrum 3 with those of the auxiliary spectrum 4,

Finally, FIG. 2 shows, schematically, an optical system 15 through which the spectral range masked out in the gap 7 to a radiation detector 16 is supplied «

The overall arrangement of FIG. 3 shows the analysis beam source 18, from which the light beam to be examined spectroscopically is initially by means of of a diaphragm gap If hidden and guided onto a light guide body 20 whose reflection surface 2t feeds it to an optical system 22, which bundles the beam in parallel on its exit side. In this Form the measuring beam is fed to a dispersion grating 23. Those of the « de, reflected and at the same time dispersing rays occur expediently

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where they are again focused and fed to it, the aperture gap shown in Figures 1 and 2 and behind the ^ * sera via the optical system 15 to the radiation detector 16 again through the same optical system 22.

The optical axis of the eyepiece I4 shown in FIGS. 1 and 2 lies in the representation of Fig * J perpendicular to the plane of the drawing, so that dad deflecting prism 10 on its step surface bounded by the edge 12 is visible "

The fading out of different spectral ranges or spectral lines on the Measuring gap 7 takes place in the embodiment of FIG. 3 by a rotary movement des. Bispersiensgitter 2J in one of the turn the circular double arrow indicated directions.

To generate a comparison intensity that reflects the fluctuations in the analyzes " radiation source 16 is to compensate, the following means continue to be Tor «, seen: in beam direction behind the masking gap I9 and in front of the guide « body 20 is a beam splitter of a known type that looks like a partially mirrored glass plate or according to the bar position from a double » prism 24, 25 is composed of different types of glass or made of single prisms of the same type of glass, but with an interposed putty "" mean 26 has a different refractive index than that of the glass. This beam splitter leads a small part of the preferably do not disperse light beam or a spectral range (spectral * line) from this a comparative radiation detector 51 sra. Appropriate this takes place similarly to the means for generating the measurement spectrum in the way that the Yergleiehsi ^ light shines through an optical system 27 occurs, which aligns it parallel and a mirror 28 feeds from the

the light beam is again focused by the same system 27 and fed through a gap 2 and a further system 50 to the alignment detector 31.

The comparison detector 51 is with the actual measuring detector 16, such as dursh 52 indicated, electrical in the form of a known Kempen sation circuit connected, which acts in such a way that in the radiation detector 16 connected display instrument 55 intensity fluctuations the radiation source 1Θ can not make themselves noticeable.

The display instrument 55 can also be digitally displayed. be set

m & m

Claims (1)

-B058330 23.6.B5 ff Protection claims 1 »Spectroscopic device, especially for ffiaterialtmtersuchiuagen, Containing radiation detectors * e.g. photomultiplier, for measuring the Intensity of certain spectral regions, especially Spaktral lines, thereby characterized in that there are masking means in the ray path in Form Tön two opaque diaphragms (5t ^) containing between Form a radiation passage at great height of the spectrum, the rest However, obscure the field of view on part of its saws. 2 «Spectroscopic device according to claim 1, characterized in that it contains a beam guiding means, in part a deflecting prism (10), one for the height of the spectral range to be measured at the same time as the to this adjoining, τοη the radiation detector screen (5,6) not removed « blended parts of the rest of the measurement spectrum bucket eyepiece (H) supplies. 3. Spectroscopic device according to claim 1 or 2, characterized in that that the edge (11) of the reflective surface (13) facing away from the eyepiece (I4) of the deflecting prism (1O) in Iahe that edge (8,9) of the measuring beam diaphragm (3,6), which is the part of the measurement spectrum (3) that is visible in great width releases. 4, spectroscopic device according to claim 1 or the following, characterized in * draws that the facilities for Tisual observation of the spectrum at the same time to observe the setting of the to be measured Spectral ranges (spectral lines) a ^ f those parts of the masking means serve as entry slits for the radiation detectors ζ z, B # Photo multiplied 16) are formed * 5 «Spectroscopic device according to claim 1 or the following, thereby ge» indicates that the beam guiding and exercising means for each radiation detector are arranged so that the relative position of the spectrum and radiation detectors in the direction of dispersion by hand © which can be changed by other means. 6 «Spectroscopic device according to claim 1 or the following, characterized in that that there is only one radiation detector for the entire spectrum (16) is provided, through which the intensity of each desired spectral range (spectral line) can be measured in any order. 7. Spectroscopic device according to claim 5 or 6, characterized in that the position of the spectrum relative to the radiation detector can be changed by adjusting, in particular rotating, the dispersion medium, preferably an optical grating (25), in such a way that the spectrum in the dispersion direction at the fade-out means ( 5 »6) for the radiation detector (16) along« wanders _# Θ «Spectroscopic device according to claim 1 or the following, characterized in, that it contains a further radiation detector (31), possibly a photo multiplier, for the simultaneous measurement of a comparison intensity, which controls the sensitivity of the measuring radiation detector with switching means known per se in such a way that fluctuations in the intensity of the analyzes «, beam source (18) are compensated. «10- Spectroscopic device according to claim Θ, characterized in that in the beam path between the analysis beam source J18) and the dispersion means (23) a beam _{splitter of a} known type - partially mirrored glass plate or double prism (24, 25) made of different types of glass or single prisms of the same type of glass and with a "jointed cement (26) with a different refractive index than the glass" is provided, which feeds a small portion of the preferably non-transparent light beam or a spectral range (spectral line) from it to the comparative radiation detector (31) " 10 · Spectroscopic device according to claim _9, characterized in that between the beam splitter and an entry slit (29) for the comparing radiation detector (3I) lies an optical system (27) which initially bundles the constant beam in parallel, a plane mirror ( 28) and the refocused beam is fed back to the entrance slit of the comparative radiation detector » 11 «Spectroscopic device according to Arispraeh 1 © of the following, thereby ge · indicates that there are optical means for fading in a hi-fi spectrum (4), which is preferably in the vicinity of the non-masked band of the Meßspektruins (3) lies and through the deflecting prism (1O) together with the Measurement spectrum can be viewed in such a way that identical lines in both spectra «· tren fall into mutual extension 12 »Spectroscopic device according to claim 11, characterized in that the same dispersion for both the measurement and the auxiliary spectrum «· medium (23) are provided * «11- 15. Spectroscopic device nada claim 1 or the following, characterized in that the usable spectrum beyond the visible range in the ultraviolet © of the infrared range is extended or from «expandable and to make these areas visible one or more W - respectively. IS «sensitive transducers - e.g. a fluorescent plate for Wf - are intended«