公开(公告)号：JPH08334465A

公开(公告)日：1996-12-17

申请号：JP14300795

申请日：1995-06-09

Applicant: SHIMADZU CORP

Inventor： MEGA AKIMASA ,  KIYOFUJI AKINORI

IPC: G01N21/64

Abstract: PURPOSE: To provide a gas analyzer which analyzes gas highly precisely with a simpler constitution. CONSTITUTION: An excitation light such as ultraviolet light generated from an excitation light source 6 excites sulfur oxide gas which is introduced to a fluorescent chamber 1 and the fluorescent light generated by the excited sulfur oxide gas is detected by a photo detector 5 via a condenser lens 2 and an optical filter 3 arranged in a detection chamber 1a. Because the fluorescent light having such wavelength components as excepting components specific to sulfur oxide is removed by the optical filter 3, the concentration of the sulfur oxide gas can be measured by measuring light quantity of the fluorescent light passing through the optical filter 3. Though the fluorescent light caused by excitation gas generated in the fluorescent chamber 1 is converged by the convergence lens 2 so as to pass through a baffle 4, most part of the fluorescent light generated from the convergence lens 2 and the optical filter 3 by the scattered excitation light is removed by the baffle 4.

公开(公告)号：JPH08159971A

公开(公告)日：1996-06-21

申请号：JP29730094

申请日：1994-11-30

Applicant: SHIMADZU CORP

Inventor： KIYOFUJI AKINORI ,  MEGA AKIMASA ,  AKI TOSHINOBU

IPC: G01N21/64 ,  G01N21/03

Abstract: PURPOSE: To easily perform alignment of an excitation light focal point, supply more fluorescence to a light receiving part and improve analysis accuracy by disposing a side-on type photomultiplier (detector) and a specific concave mirror in parallel to an excitation light optical axis. CONSTITUTION: The fluorescence analyzer 1 consists of a xenon lamp 3 for irradiating the insides of sample chambers 2, 2 with excitation light, a photomultiplier 4 as a detector oppositely disposed in both the sides of the sample chamber 2 interposing its optical axis K between them and a light collecting mirror (concave mirror) 5. The light collecting mirror 5 is composed of a reverse semicylindrical concave mirror having a flat reflection face in the parallel direction to the optical axis K, and collects fluorescence in a wide range in the direction of the optical axis K of the excitation light, which can be supplied to a light receiving part 9 of the long photomul. 4 in the direction of the optical axis K. Thus, alignment of a focal point of the excitation light from the lamp 3 is made easy, more fluorescence can be also collected from the circumference of the focal point, and fluorescence analysis accuracy is improved.

公开(公告)号：JPH08159955A

公开(公告)日：1996-06-21

申请号：JP29729894

申请日：1994-11-30

Applicant: SHIMADZU CORP

Inventor： AKI TOSHINOBU ,  MEGA AKIMASA ,  KIYOFUJI AKINORI

IPC: G01N21/64 ,  G01N21/05

Abstract: PURPOSE: To prevent the S/N ratio from deteriorating and to improve the detection performance by providing a screening body for screening a linear optical path for connecting an optical window for emission and an optical window for detection and attenuating stray light toward a detector with a space consisting of the light-screening body and the inner wall of a fluorescence room. CONSTITUTION: A light screening body 11 where a hole is opened at the center of a circular plate is arranged at a space 13 as an optical path between openings 3 and 9 of a fluorescent room (sample room) 4 so that the peripheral edge part is in contact with the inner wall 18 of the fluorescent room 2, thus forming the rough surface with a low reflection on the surface of the inner wall 18. When a gas to be analyzed is guided 5 into the fluorescent room 4 and excitation light is applied from an Zn lamp 1 to the fluorescent room 4, stray light which is reflected directly or inside the fluorescent room 4 out of the excitation light repeats a number of reflections to the inner wall 18 of the fluorescent room 4 and the screening body 11 constituting the space 13 and is attenuated at each reflection, thus causing the excitation light through the screening body 11 to be attenuated and hence preventing it from being received by a multiplication tube 8 for preventing S/N ratio from being reduced.

公开(公告)号：JPH0763683A

公开(公告)日：1995-03-10

申请号：JP21306793

申请日：1993-08-27

Applicant: SHIMADZU CORP

Inventor： AKI TOSHINOBU ,  KIYOFUJI AKINORI ,  MEGA AKIMASA

IPC: G01N21/64

Abstract: PURPOSE:To measure a gas to be analyzed with good accuracy without using a complicated and high-cost interference-component removal mechanism by a method wherein the fluorescence amount of a sample gas excluding only the gas to be analyzed (containing an interference component) is subtracted from the fluorescence amount of a sample gas which contains the gas to be analyzed and the interference component. CONSTITUTION:A sample gas which has been introduced into a fluorescence chamber (A) 2 from a gas introduction part 6 is irradiated with ultraviolet rays from an exciting light source 1, and fluorescence is generated. It contains fluorescence due to an interference component in addition to SO2 gas. The fluorescence is detected by an exciting- light detection part 4, it is used as a signal A, and it is stored in an operation circuit 13. Then, optical-route changeover devices 11-1 to 11-3 are operated, the light source 1, the detection part 4 and an exciting-light monitoring part 5 are changed over to a fluorescence chamber (B) 3 from the fluorescence chamber (A) 2. In succession, when the fluorescence chamber (B) 3 is irradiated with ultraviolet rays, fluorescence is generated by a sample gas whose SO2 has been removed 8, i.e., by the interference component, it is detected 4, and it is stored as a signal B. Then, when the signal B is subtracted from the signal A, the concentration of SO2 gas as an object can be detected.