DE7640723U1 - PNEUMATIC RADIATION DETECTOR - Google Patents

Description

. Hartmann & ^Braun: -60Ö0 Fri-aAki'urt (, Main), '-''\ \ .V'o Aktiengesellschaft G./äf ^road; 97 ί.ο / Ri

Pneumatic radiation detector

The innovation relates to a pneumatic radiation detector, especially for a two-stream ultrared gas analyzer, in which a modulation device hackers the radiation in both radiation paths out of phase and the detector for each radiation path has two consecutive gas filled with radiation and absorbing gas radiation permeable.
Detector chambers provided with windows, to which a further chamber, located centrally between the detector chambers, is connected, with a membrane capacitor located therein, nor the membrane condenser chamber in two chamber parts and the pressure difference between the chamber parts in an electrical: -:
Signal converts.

7640723 06/16/77

-d-

The task of the innovation is to improve such a radiation detector with regard to its measuring properties, in particular with regard to the zero point stability and dec, occurrence of signal disturbances caused by acting inecr. Vibrations and shocks that lead to vibrations of the gas mass u: ^ i of the capacitor membrane. This object is achieved by the fact that the two detector chambers (7, 9) and the two following detector chambers (8, 10) with one of the chamber parts (13 or 16) of the measuring device in each beam path first acted upon by the radiation are connected and that all chambers or chamber parts (7, ^. 9 · 1'X 13, 16) and the gas-conducting connections (14, 1S, 17, 1 ^) se
are dimensioned and arranged so that the center of gravity of the gas masses in the detector chambers (7, 9) first acted upon by the radiation and the connected chamber part (13) of the membrane condenser chamber (11) with the focus of the gas water in the last acted upon by the radiation Detector chamber:
(8, 10) and the chamber part (Ίο) of the
Membrane condenser chamber (11) collapses.

The drawing shows an embodiment of the radiation detector according to the invention for a two-beam ultrared gas analyzer.

The radiation from two ultra-red tracers 1 and d 2, guided in parallel beam paths, is chopped up in phase opposition by a citing diaphragm disk 3. In one beam there is eich
a measuring cell 4 through which test gas flows, in the other radiation

7640723 16. above 77

off a column filled with a reference gas or evacuated reference cell 5 · The designated 6 radiation detector consists of a metal block with the successive betektorkammern 7 and 8 for the from the measuring cuvette ^ emerging radiation and the successive Detektorkamineru '■) UML 10 for the from the reference cell 5 emitted radiation. All chambers, the cuvettes and the radiators are provided with gas-tight, radiation-permeable windows: another chamber 11 which is divided by a condenser membrane 12 is located between the detector chambers in the iietailblook. The upper part 13 of the membrane condenser canister is provided by gas-conducting connections 14 and 15 with the detector chamber: i 7 and 9 in connection and the lower part 16 of the membrane condenser chamber through gas-conducting connections Iy and 13 with the detector chambers 8 and 10. The capacitor membrane 12 opposite -a stationary plate electrode 19 is arranged.

The in the gas-filled detector chambers by straniung & cibsorption resulting pressure fluctuations are grounded by the membrane condenser after applying a voltage to the line terminal ^ n 20 and 21 converted into an electrical signal that is proportional to the pressure difference between the chamber parts 13 and 16 of the membrane capacitor chamber 11 is.

The detector chambers 8 and 10 are in a known manner from radiation-physical Conical reasons. All kaiiunern or chamber parts, as well as the gas-conducting connections are arranged in this way and dimensioned so that the center of gravity of the cias masses is in

7640723 06/16/77

de: a doping channel first exposed to the radiation (7, 9) and the connected chamber part (13) of the membrane condenser chamber (11) with the focus of the gas masses in the detector chambers (8, 10) and the to this connected chamber part (16) of the MemDrankondeusatorkammer (11) coincides. The main focus is preferably on the Ciosac: the same distance in the plane of symmetry of the detector of the detector chambers and the membrane condenser chamber halved. This results in the advantageous metrological effects set out at the beginning.

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7640723 06/16/77

Claims (1)

Protection claim: Pneumatic radiation detector, especially for a two-beam ultrared gas analyzer in which a modulating device chops the radiation in both beam paths out of phase and the detector for each beam path in a block two successive, filled with radiation-absorbing gas and Detector chambers provided with radiation-permeable windows has, to which another, centrally between the Detektorkamiaern located Kärrner, with a membrane capacitor located in it is connected, which divides the membrane condenser chamber into two chamber parts and the pressure difference between the Converts camera parts into an electrical signal, characterized in that daij the two detector chambers (7, 9) first acted upon by the radiation in each beam path and the two subsequent Detektorkammerη (8, 10) with one of the chamber parts (13 or 16) of the membrane condenser chamber are connected and that all chambers or chamber parts (7, S, 9, 10, 13, 16) and the gas-conducting connections (14, 15, 17, 18) so dimensioned and are arranged that the center of gravity of the gas masses in the detector chambers acted upon by the radiation first (7, 9) and the connected chamber part (1 $) of the membrane condenser chamber (11) with the center of gravity of the gas masses ir. The detector chambers (8, 10) last impacted by the radiation and the chamber part (16) of the memü connected to it: an- 'condenser chamber (11) collapses.