DE634131C - Device for measuring light currents - Google Patents

Device for measuring light currents

Info

Publication number
DE634131C
DE634131C DEZ19785D DEZ0019785D DE634131C DE 634131 C DE634131 C DE 634131C DE Z19785 D DEZ19785 D DE Z19785D DE Z0019785 D DEZ0019785 D DE Z0019785D DE 634131 C DE634131 C DE 634131C
Authority
DE
Germany
Prior art keywords
voltage
capacitor
measuring
measuring instrument
photocell
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
Application number
DEZ19785D
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zeiss Ikon AG
Original Assignee
Zeiss Ikon AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Zeiss Ikon AG filed Critical Zeiss Ikon AG
Priority to DEZ19785D priority Critical patent/DE634131C/en
Application granted granted Critical
Publication of DE634131C publication Critical patent/DE634131C/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/44—Electric circuits
    • G01J1/46—Electric circuits using a capacitor

Description

Vorrichtung zum Messen von Lichtströmen Die vorliegende Erfindung bezieht sich auf eine Vorrichtung zum Messen von Lichtströmen unter Verwendung einer Photozelle, einer Spannungsquelle, :eines Kondensators und einer Meßvorrichtung, bei -welcher der durch die Belichtung in der Zelle hervorgerufene Photostrom die Ladung oder Entladung des Kondensators bewirkt, dessen Spannungsänderung als Maß für die Lichtstärke dient.Apparatus for measuring luminous fluxes The present invention relates to an apparatus for measuring luminous fluxes using a Photocell, a voltage source,: a capacitor and a measuring device, at -which is the photocurrent caused by the exposure in the cell Charging or discharging of the capacitor causes its voltage change as a measure serves for the light intensity.

Bei bekannten Vorrichtungen dieser Art war bisher einerseits die Verwendung einer Batterie niederer Spannung und eines höchstempfindlichen Meßinstrumentes (Elektrometer) bekannt. Eine solche Vorrichtung war mechanisch sehr empfindlich und konnte durch geringste Erschütterung zerstört werden. Andererseits war auch die Verwendung einer Batterie hoher Spannung und eines Meßinstrumentes verringerter Empfindlichkeit (Galvanometer) bekannt. Diese Vorrichtung war wegen der großen Batterie schwer transportabel.In known devices of this type, on the one hand, the use has hitherto been the case a low voltage battery and a highly sensitive measuring instrument (electrometer) known. Such a device was mechanically very sensitive and could through even the slightest vibration. On the other hand, there was also the use of a High voltage battery and a measuring instrument of reduced sensitivity (galvanometer) known. This device was difficult to transport because of the large battery.

Die Erfindung besteht nun darin, daß zwecks Verwendung eines unempfindlichen Meßinstrumentes und einer Stromquelle von für die Betätigung dieses Meßinstrumentes an sich unzureichender Spannung der Kondensator regelbar ist, so daß sich die Spannung im Photozellenkreis durch Verkleinerung der Kapazität erhöhen läßt.The invention is that for the purpose of using an insensitive Measuring instrument and a power source for operating this measuring instrument In itself insufficient voltage of the capacitor can be regulated, so that the voltage can be increased in the photocell circuit by reducing the capacity.

Mit der Stromquelle niederer Spannung wird zunächst ein Kondensator bestimmter Kapazität aufgeladen und dann durch Verkleinerung seiner Kapazität nach bekannten elektrostatischen Gesetzen die Spannung entsprechend erhöht. Bei dieser erhöhten Spannung liefert die Photozelle dann einen so hohen Phonostrom, daß ein an und für sich unempfindliches Meßinstrument, z. B. ein Galvanometer, anspricht.With the low voltage power source, a capacitor is first used certain capacity and then charged by reducing its capacity known electrostatic laws, the voltage increases accordingly. At this increased voltage, the photocell then delivers such a high phono current that a in and of itself insensitive measuring instrument, e.g. B. a galvanometer responds.

Der Vorteil dieser Vorrichtung gemäß der Erfindung gegenüber dem Bekannten besteht darin, daß sie sowohl leicht transportabel als auch gleichzeitig mechanisch unempfindlich ist.The advantage of this device according to the invention over the known is that they are both easily transportable and mechanical at the same time is insensitive.

Claims (1)

PATENTANSPRUCH Vorrichtung zum Messen von Lichtströmen unter Verwendung einer Photozelle, einer Batterie, eines Kondensators und einer Meßvorrichtung, bei der der durch die Belichtung in der Zelle hervorgerufene Photostrom die Ladung oder Entladung eines Kondensators bewirkt, dessen Spannungsänderung als Maß für die Lichtstärke dient, dadurch gekennzeichnet, daß zwecks gemeinsamer Verwendung eines unempfindlichen Meßinstrumentes (z. B. Galvanometers) und einer Stromquelle von für die Betätigung dieses Meßinstrumentes an sich unzureichender Spannung der Kondensator regelbar ist, -so daß die Spannung im Photozellenkreis durch Verkleinerung der Kapazität sich erhöhen läßt.PATENT CLAIM Device for measuring luminous flux using a photocell, a battery, a capacitor and a measuring device the photocurrent caused by the exposure in the cell the charge or Discharge of a capacitor causes its voltage change as a measure of the light intensity serves, characterized in that for the purpose of common use of an insensitive Measuring instrument (e.g. galvanometer) and a power source for actuation of this measuring instrument in itself insufficient voltage of the capacitor can be regulated is, -so that the voltage in the photocell circuit by reducing the capacity can be increased.
DEZ19785D 1931-12-08 1931-12-08 Device for measuring light currents Expired DE634131C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEZ19785D DE634131C (en) 1931-12-08 1931-12-08 Device for measuring light currents

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEZ19785D DE634131C (en) 1931-12-08 1931-12-08 Device for measuring light currents

Publications (1)

Publication Number Publication Date
DE634131C true DE634131C (en) 1936-08-17

Family

ID=7624960

Family Applications (1)

Application Number Title Priority Date Filing Date
DEZ19785D Expired DE634131C (en) 1931-12-08 1931-12-08 Device for measuring light currents

Country Status (1)

Country Link
DE (1) DE634131C (en)

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