Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J61/00—Gas-discharge or vapour-discharge lamps
  • H01J61/02—Details
  • H01J61/04—Electrodes; Screens; Shields
  • H01J61/06—Main electrodes
  • H01J61/067—Main electrodes for low-pressure discharge lamps
  • H01J61/0672—Main electrodes for low-pressure discharge lamps characterised by the construction of the electrode
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J61/00—Gas-discharge or vapour-discharge lamps
  • H01J61/64—Cathode glow lamps

Definitions

• the invention relates to a glow discharge lamp with a cathode plate, to which the sample can be attached, and which has a recess into which an anode nozzle, which is attached to an anode plate and which is separated from the cathode by a small intermediate space, and which is in Has continuous opening in the direction of its longitudinal axis.
• Such a glow discharge lamp is described in DE-AS 1 589 389. Furthermore, a glow discharge lamp of this type, which in particular can have a floating anode, is manufactured by Spectruma GmbH. This known glow discharge lamp is expressly referred to in order to explain all the details which are not explained in more detail below.
• a disadvantage of the known glow discharge lamp and of all similarly designed glow discharge lamps, however, is that during operation contaminants are deposited on the anode, which impair the reproducibility of the glow discharge and thus the measurement result.
• the invention is based on the object of providing a glow discharge lamp with a cathode plate to which the sample can be attached and which has a recess into which an anode socket attached to an anode plate projects. which is separated from the cathode by a small space, and which has a through opening in the direction of its longitudinal axis, and whose anode can in particular be a so-called floating anode, in such a way that cleaning of the lamp is facilitated and the same ⁇ reproducibility is improved at an early stage.
• the anode socket is detachably connected to the anode plate. This means that the anode socket, on which impurities are deposited in particular, can easily be replaced by inexperienced personnel for a "clean" socket, without the entire lamp having to be dismantled, through the openings through which the sample is also used.
• the anode socket of a glow discharge lamp with a floating anode which can be constructed in particular according to one of claims 1 to 4, "in situ" in addition or as an alternative to the measure specified in claim 1 can be cleaned that a voltage of approximately 100V 500V is applied to the anode against a reference element of the lamp which is not the cathode.
• This "cleaning voltage” is opposite to the normal operating polarity. This voltage loosens impurities deposited on the anode socket during operation and precipitates it at a point where it can function Do not interfere with the glow discharge lamp.
• the cleaning current is typically 10 mA.
• connection between anode supports and anode plate is a plug-in or screw connection.
• the development characterized in claim 3, according to which the anode socket has an insert at its cathode-side end which is detachably connected to the anode socket base part, has the advantage that under most operating conditions only the insert has to be replaced.
• This insert can consist of a metal or a ceramic material.
• FIG. 1 shows the anode / cathode unit of a glow discharge lamp designed according to the invention
• FIG. 2 enlarges the anode from FIG. 1.
• the anode / cathode unit shown in the figures has a cathode 01 which is spaced apart from one Anode plate 02 is arranged.
• an insulating disk 04 and an insulating ring 06 are provided, which are arranged between the cathode 01 and the anode 02.
• the sample (not shown) can be attached to the cathode plate 01 in a known manner. Furthermore, the cathode 01 has a recess into which a ceramic sleeve 04 is inserted.
• the recess provided in the cathode plate 01 is penetrated by an anode connector 03 attached to the anode plate 02, which is separated from the cathode 01 by a small intermediate space and which has an opening which is continuous in the direction of its longitudinal axis.
• the anode socket 03 is detachably, for example screwed or pluggable, connected to the anode plate.
• the anode socket 03 has an insert 08 at its cathode-side end, which insert is detachably connected to the anode socket base part 03.
• the insert 08 can consist of a metal or a ceramic material.
• This design according to the invention has the advantage that the mechanical cleaning of the anode connector 03 previously required is eliminated. Instead, the anode socket 03 or even the insert 08 can simply be replaced. This is easily possible even for inexperienced operators.

Landscapes

• Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
• Discharge Lamp (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=6384199

Family Applications (1)

Country Status (3)

Family Cites Families (3)

• 1989
  • 1989-07-03 DE DE19893921855 patent/DE3921855C1/de not_active Expired - Fee Related
• 1990
  • 1990-07-03 EP EP19900909631 patent/EP0432244A1/de not_active Withdrawn
  • 1990-07-03 WO PCT/DE1990/000494 patent/WO1991000611A2/de not_active Application Discontinuation

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