DE911340C - Device for photoelectric speed measurement - Google Patents
Device for photoelectric speed measurementInfo
- Publication number
- DE911340C DE911340C DEL1918A DEL0001918A DE911340C DE 911340 C DE911340 C DE 911340C DE L1918 A DEL1918 A DE L1918A DE L0001918 A DEL0001918 A DE L0001918A DE 911340 C DE911340 C DE 911340C
- Authority
- DE
- Germany
- Prior art keywords
- photocell
- light source
- central opening
- converging lens
- markings
- 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
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/486—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by photo-electric detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Description
Die Erfindung betrifft eine Vorrichtung zur Drehzahlmessung, insbesondere von langsam umlaufenden Teilen durch photoelektrische Abtastung einer Vielzahl von Markierungen auf dem umlaufenden Teil, beispielsweise an Elektrizi tätszählern, wobei ein spaltförmiges Abtastlichtbündel durch ein Objektiv auf die Markierungen geworfen wird und Lichtquelle, Optik und Photozelle zu einem Bauteil vereinigt sind. The invention relates to a device for speed measurement, in particular of slowly rotating parts by photoelectric scanning of a large number of Markings on the rotating part, for example on electricity meters, whereby a slit-shaped scanning light beam through an objective onto the markings is thrown and light source, optics and photocell are combined into one component.
Bei den bekannten Abtasteinrichtungen dieser Art sind die Lichtquelle und die Photozelle in je einem seitlichen Ansatz eines Tragkörpers, z. B. eines Rohres, untergebracht, wodurch sich eine sperrige Bauweise ergibt. Ferner sind hierbei besondere Abdeckungen der Lichtquelle gegen die Photozelle oder Teilabschirmungen der Lichtquelle gegen das Objektiv erforderlich, so daß nicht die gesamte Lichtmenge zur Ausleuchtung der Markierungen zur Verfügung steht. In the known scanning devices of this type, the light source is and the photocell in each of a side approach of a support body, z. B. one Rohres, housed, which results in a bulky design. Also here are special covers of the light source against the photocell or partial shields the light source required against the lens, so that not the entire amount of light is available for illuminating the markings.
Diese Nachteile werden erfindungsgemäß dadurch behoben, daß Lichtquelle und Optik hinter einer ringförmigen Photozelle angeordnet sind und das spaltförmige Abtastlichtbündel durch die zentrale Öffnung der Photozelle auf die Markierungen geworfen wird. These disadvantages are eliminated according to the invention in that light source and optics are arranged behind an annular photocell and the gap-shaped Scanning light beam through the central opening of the photocell onto the markings is thrown.
Hierbei kann das Gehäuse als glattes Rohr ohne seitliche Ansätze ausgebildet sein, und ferner fallen besondere Abdeckungen der Lichtquelle gegen die Photozelle bzw. gegen das Objektiv weg. The housing can be used as a smooth tube without any lateral extensions be formed, and also fall against special covers of the light source away from the photocell or against the lens.
Zweckmäßig ist unmittelbar hinter der zentralen Öffnung der Photozelle eine Sammellinse angeordnet, deren Brennpunkt mit dem Brennpunkt einer vor der Lichtquelle angeordneten zweiten Sammellinse zusammenfällt. Hierbei wird das spaltförmige Abbild zur Abtastung der Markierungen durch parallele Strahlen auf die Markierungen geworfen, so daß unabhängig von der Entfernung der Lichtquelle und Optik von den Markierungen auf der Zählerscheibe auf diese immer ein scharfes Bild des Abtastlichtspaltes geworfen wird. Das ist besonders wichtig für die Abtastung von im Zählergehäuse eingebauten Zählerscheiben, da bei verschiedenen Zählertypen der Abstand des Zählerscheibenrandes von dem Fenster im Zählergehäuse verschieden groß ist. It is useful to have the photocell immediately behind the central opening a converging lens arranged, the focal point of which with the focal point of one in front of the light source arranged second converging lens coincides. Here, the slit-shaped image for scanning the markings thrown onto the markings by parallel beams, so that regardless of the distance of the light source and optics from the markings a sharp image of the scanning light slit is always thrown onto the counter disk will. This is particularly important for the scanning of those built into the meter housing Counter disks, as the distance between the edge of the counter disks for different types of meters is different in size from the window in the meter housing.
In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. An exemplary embodiment of the invention is shown in the drawing.
In dem Gehäuse G ist vor einem Hohlspiegel H die Lichtquelle E angeordnet. Der Glühfaden liegt zwischen Brennpunkt und Mittelpunkt des Hohlspiegels in der Nähe des Brennpunktes, so daß vom Hohlspiegel ein vergrößertes Bild des Glühfadens auf die Sammellinse S1 geworfen wird. Vor dieser befindet sich eine zweite kleine Sammellinse S2. The light source E is arranged in front of a concave mirror H in the housing G. The filament lies between the focal point and the center of the concave mirror in the Near the focal point, so that an enlarged image of the filament can be seen from the concave mirror is thrown onto the converging lens S1. In front of this is a second small one Converging lens S2.
Diese beiden Sammellinsen sind in solchem Abstand voneinander angeordnet, daß ihre Brennpunkte zusammenfallen. Die Sammellinse S2 ist unmittelbar vor der zentralen Öffnung B einer ringförmigen Photozelle Z angeordnet, die im Vorderende des Gehäuses G eingebaut und durch den nach innen gezogenen Rand K des Gehäuses gegen Fremdbelichtung geschützt ist. Die zentrale Öffnung B der Photozelle kann als Spaltblende ausgebildet sein.These two converging lenses are arranged at such a distance from each other that that their foci coincide. The converging lens S2 is immediately in front of the central opening B of an annular photocell Z arranged in the front end of the housing G installed and through the inwardly drawn edge K of the housing is protected against external exposure. The central opening B of the photocell can be designed as a slit diaphragm.
Von der Sammellinse 52 wird das spaltförmige Abtastlichtbündel mit parallelen Strahlen auf den Rand der Zählerscheibe A geworfen und von dort auf die ringförmige Photozelle Z reflektiert. Mit F ist das Fenster im Zählergehäuse angedeutet.The slit-shaped scanning light bundle is carried along by the converging lens 52 parallel rays are thrown onto the edge of the counter disk A and from there onto the ring-shaped photocell Z reflects. The window in the meter housing is indicated by F.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEL1918A DE911340C (en) | 1950-05-03 | 1950-05-03 | Device for photoelectric speed measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEL1918A DE911340C (en) | 1950-05-03 | 1950-05-03 | Device for photoelectric speed measurement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE911340C true DE911340C (en) | 1954-05-13 |
Family
ID=7255633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEL1918A Expired DE911340C (en) | 1950-05-03 | 1950-05-03 | Device for photoelectric speed measurement |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE911340C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1175895B (en) * | 1962-06-06 | 1964-08-13 | Philips Patentverwaltung | Pulse generator for electrical impulses derived from mechanical movements |
| DE1256905B (en) * | 1963-04-08 | 1967-12-21 | Electronics Corp America | Optical scanning device |
-
1950
- 1950-05-03 DE DEL1918A patent/DE911340C/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1175895B (en) * | 1962-06-06 | 1964-08-13 | Philips Patentverwaltung | Pulse generator for electrical impulses derived from mechanical movements |
| DE1256905B (en) * | 1963-04-08 | 1967-12-21 | Electronics Corp America | Optical scanning device |
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