DE801235C - Photoelectric photometer - Google Patents
Photoelectric photometerInfo
- Publication number
- DE801235C DE801235C DEL234A DEL0000234A DE801235C DE 801235 C DE801235 C DE 801235C DE L234 A DEL234 A DE L234A DE L0000234 A DEL0000234 A DE L0000234A DE 801235 C DE801235 C DE 801235C
- Authority
- DE
- Germany
- Prior art keywords
- gray
- value
- photometer
- photoelectric photometer
- photoelectric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/251—Colorimeters; Construction thereof
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Description
1 ei 1 ichtelektrischen Pllolometern hat man bisher die zu untersuchende Probe in fester Schichtdicke verglichen mit veränderlichen Lichtschwächungsmittel, wie Graukeilen, oder Nicols, oder durch Veränderung des Widerstandes bei Verwendung von zwei Photozellen in Kompensationsschaltung. Up to now, the one to be investigated has been used in 1 non-electric plolometers Sample in fixed layer thickness compared to variable light attenuating agents, like gray wedges, or Nicols, or by changing the resistance when using of two photocells in compensation circuit.
Der Nachteil dieser Meßanordnung ist der, daß man nur rein zufällig den Optimalwert der Photozelle ausnutzt. Bekanntlich liegt der Optimalwert bei photoelektrischen Messungen bei einer Extinktion von 0,4343. Dieser Wert ergibt sich beim Differenzieren des Beerschen Gesetzes. dE 0,4343 dE0,4343 . dJ - oder - = -dJ J E E . J Um nun von dieser Zufällighkeit unabhängig zu werden und bei jeder Messung die optimale Empfindlichkeit des photoelektrischen Teiles auszunutzen, wird nach der Erfindung im Vergleichsstrahlengang eine Grauplatte voll der ungefähren Extinktion 0,43 angeordnet. Hierbei soll unter dem Begriff Grauplatte jegliches Lichtschwächungsmittel verstanden werden, das sich auf diesen Wert fest einstellen läßt, Es soll noch in den Rahmen del Erfindung fallen, wenn der Extinktionswert zwischen - 15 0/o und H 25% gegenüber dem Wert 0,43 schwankt.The disadvantage of this measuring arrangement is that you only get it by chance uses the optimum value of the photocell. It is known that the optimum value is photoelectric Measurements at an absorbance of 0.4343. This value results from differentiation of Beer’s Law. dE 0.4343 dE0.4343. dJ - or - = -dJ J E E. J To now to become independent of this randomness and the optimal one for every measurement To take advantage of the sensitivity of the photoelectric part, according to the invention A gray plate with an approximate absorbance of 0.43 is placed in the comparison beam path. Here, the term gray plate should be understood to mean any light attenuating agent that can be permanently set to this value, it should still be in the frame del invention fall when the extinction value between -15 0 / o and H 25% compared the value 0.43 fluctuates.
In der Zeichnung ist die Einrichtung schematisch dargestellt. The device is shown schematically in the drawing.
Von der Lichtquelle 1 werden die beiden Blendenöffnungen 2 und 3 beleuchtet, die von den Linsen 4 und 5 nach Unendlich abgebildet werden. In den Strahlengängen liegen die Küvetten 6 und 7 mit den Eintauchstäben 8 und 9. Im linken Strahlen gang folgt dann die erfindungsgemäße Grauplatte 10. im rechten eine farblose Platte 1 1 gleicher Dicke. Hierauf kann ein gemeinsames Lichtfilter 12 angeordnet sein, hinter dem die Photozellen 13 und 14 mit Galvanometer 15 und Regelwiderstand 16 in Kompensationsschaltung liegen. The two diaphragm openings 2 and 3 are made by the light source 1 illuminated, which are imaged by the lenses 4 and 5 to infinity. In the The cuvettes 6 and 7 with the immersion rods 8 and 9 are in the beam paths Ray path then follows the gray plate 10 according to the invention in the right a colorless one Plate 1 1 of the same thickness. A common light filter 12 can be arranged on this be behind which the photocells 13 and 14 with galvanometer 15 and rheostat 16 are in compensation circuit.
In die Küvette 6 wird Wasser l>zw. das Lösungsmittel der zu untersuchenden Substanz, in die Küvette 7 die zu untersuchende Lösung selbst eingefüllt und dann werden die Eintauchstäbe 8 und 9 bei ausgeschaltetem Grau- und Glasfilter auf die Schichthöhe Null eingestellt. Dann wird durch Betätigen des Regelwiderstandes die Nullstellung des Galvanometers herbeigeführt. Hierauf wird das Graufilter und Glasfilter eingeschaltet und die Schichthöhe so lange verändert, bis das Galvanometer wieder auf Null steht. Die abgelesene Schichthöhe entspricht einer Extinktion von 0,43. In the cuvette 6 water is l> betw. the solvent of the to be examined Substance, the solution to be examined is filled into the cuvette 7 itself and then the immersion rods 8 and 9 with the gray and glass filter switched off on the Layer height set to zero. Then, by pressing the rheostat, the Brought about zeroing of the galvanometer. This is followed by the gray filter and glass filter switched on and the layer height changed until the galvanometer again is at zero. The layer height read off corresponds to an extinction of 0.43.
Durch Umrechnung ergibt sich der Extinktionskoeffizient.The extinction coefficient results from conversion.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEL234A DE801235C (en) | 1949-11-01 | 1949-11-01 | Photoelectric photometer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEL234A DE801235C (en) | 1949-11-01 | 1949-11-01 | Photoelectric photometer |
Publications (1)
Publication Number | Publication Date |
---|---|
DE801235C true DE801235C (en) | 1950-12-28 |
Family
ID=7254797
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEL234A Expired DE801235C (en) | 1949-11-01 | 1949-11-01 | Photoelectric photometer |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE801235C (en) |
-
1949
- 1949-11-01 DE DEL234A patent/DE801235C/en not_active Expired
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