Emission spectrometer with cooled photomultiplier tube detector
阅读：642发布：2023-06-02
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1. AN EMISSION SPECTROMETER COMPRISING IN COMBINATION, MEANS FOR HOLDING A SPECIMEN FOR EXCITATION TO EMIT LIGHT, MEANS FOR SELECTING A NARROW WAVEBAND OF LIGHT FROM THE LIGHT EMITTED BY THE SPECIMEN, MEANS FOR RECEIVING LIGHT FROM SAID LIGHT SELECTING MEANS AND GENERATING A SIGNAL CURRENT IN RESPONSE THERETO INCLUDES A PHOTOMULTIPLIER TUBE HAVING METAL TERMINAL PINS, MEANS FOR CONNECTING THE PHOTOMULTIPLIER TUBE TO MEANS FOR MEASURING THE SIGNAL CURRENT THEREOF AND TO A VOLTAGE SOURCE, SAID CONNECTING MEANS INCLUDING A PIN SOCKET PLATE ADAPTED TO RECEIVE THE METAL TERMINAL PINS OF THE PHOTOMULTIPLIER TUBE FOR SEPARATE ELECTRICAL CONTACT THEREWITH AND TO LEAVE A PORTION OF EACH OF THE PINS UNCOVERED, MEANS FOR HOUSING THE PHOTOMULTIPLIER TUBE FOR OPERATION AT LOW TEMPERATURES WHEN ASSEMBLED TO SAID PIN SOCKET PLATE INCLUDING A COOLING CHAMBER HAVING MEANS FO MOUNTING THE PHOTOMULTIPLIER TUBE AND ASSEMBLED PIN SOCKET PLATE THEREIN IN SPACED RELATION TO THE WALLS OF SAID CHAMBER. SAID COOLING CHAMBER HAVING INLET MEANS AND OUTLET MEANS FOR FLOW OF COLD DRY GAS THERETHROUGH AND OVER THE PHOTOMULTIPLER TUBE AND ASSEMBLED PIN SOCKET PLATE MOUNTED THEREIN, MEANS FOR TRANSMISSION OF LIGHT FROM SAID LIGHT SELECTING MEANS TO THE PHOTOCATHODE OF THE PHOTOMULTIPLER TUBE IN SAID COOLING CHAMBER INCLUDING A LIGHT PIPE ADAPTED TO EXTEND FROM SAID LIGHT SELECTING MEANS INTO SAID COOLING CHAMBER AND OF A LENGTH TO PLACE THE OCCURRENCE OF A TEMPERATURE GRADIENT IN THE LIGHT PIPE AT A POINT REMOVED FROM THE LIGHT-ENTRANT FACE THEREOF, AND MEANS FOR MEASURING THE SIGNAL CURRENT OF THE PHOTOMULTIPLIER TUBE.
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