公开(公告)号：US3843257A

公开(公告)日：1974-10-22

申请号：US37133773

申请日：1973-06-18

Applicant: MONSANTO RES CORP

Inventor： WOOTEN G

IPC: G01N21/68 ,  G01N22/00 ,  G01J3/30 ,  G01N1/00 ,  G01N21/16

CPC classification number: G01N22/00 ,  G01N21/68

Abstract: A multifunctional, multimode, selective microwave-excited emission detector is described which is capable of detecting and analyzing metallic and non-metallic compositions of organic or inorganic nature at subnanogram levels on an integrated or real time basis. The detector concept utilizes microwave energy at frequencies of 2.45 GHz (gigahertz, i.e., billion cycles) or higher to excite spectral emission of atomic and/or polyatomic constituents of the composition being analyzed. The microwaveexciting process can be carried out under pressure, at atmospheric pressure or at reduced pressures, however, for increased sensitivity pressures of the order of about 1 Torr or less are preferred and extremely high sensitivities can be attained by carrying out the discharge and excitation in a magnetic field sufficient to sustain the discharge at pressures of the order of 10 5 to 10 6 Torr using photon counters for detection. Definitive spectral lines or bands are isolated either by a diffraction grating monochromator or band-pass filters. The emission intensity of the spectral line(s) or band(s), which is a function of concentration, is measured by photomultiplier detectors and ancillary electronic read-out. A temperatureprogrammed sample pyrolysis probe can be used on liquid or solid samples to circumvent spectral interference problems. A reference channel in the electro-optical portion of the instrument can be used for stabilization or to null-out background or undesired interfering spectral lines. A multichannel optical system can be used to observe a number of different spectral lines at the same time, thereby detecting different emission lines of the same element or lines of a number of different elements simultaneously.

公开(公告)号：US3749929A

公开(公告)日：1973-07-31

申请号：US3749929D

申请日：1971-10-07

Applicant: MONSANTO RES CORP

Inventor： WOOTEN G ,  ILTIS R ,  JOHNSON V

IPC: G01N21/76 ,  H01J39/00

CPC classification number: G01N21/766 ,  Y10T436/179228 ,  Y10T436/186

Abstract: The invention is a chemiluminescent method and apparatus for detecting NOx (NO and NO2), SO2, CO and other gases which react with atomic oxygen to produce chemiluminescence. Atomic oxygen generated by pulse electrical discharge is added at a controlled and known flow rate to a reaction chamber to which is also added at a controlled and known flow rate a gas mixture to be analyzed. The reaction chamber is maintained at a sufficient pressure to support chemiluminescence, normally above about 0.1 Torr and in the range of about 0.5 to 5.0 Torr. Photoelectric means is used to measure the chemiluminescence, and the photoelectric means is synchronized with the pulse discharge so that photoelectric means is turned off during the time of a pulse and for sufficient time thereafter to allow the light generated by the pulse discharge to disappear, whereby the only light the photoelectric means sees is chemiluminescence. The reaction zone and the oxygen generating means are compact and are located adjacent one another to allow miniaturization of the equipment.

Abstract translation: 本发明是一种用于检测与原子氧反应产生化学发光的NOx（NO和NO 2），SO 2，CO和其它气体的化学发光方法和装置。 通过脉冲放电产生的原子氧以受控且已知的流速加入到反应室中，反应室也以受控和已知的流速加入待分析的气体混合物。 反应室保持在足够的压力下以支持化学发光，通常在约0.1托以上且在约0.5至5.0托的范围内。 光电装置用于测量化学发光，并且光电装置与脉冲放电同步，使得光电装置在脉冲期间关闭，并且此后足够的时间允许由脉冲放电产生的光消失，由此 光电所看到的唯一的光是化学发光。 反应区和氧气发生装置是紧凑的并且彼此相邻地定位，以允许设备的小型化。