1998 Fiscal Year Final Research Report Summary
High resolution, high sensitivity gas analyzer using a wide-band tunable CO_2 laser
| Project/Area Number |
09555017
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Applied optics/Quantum optical engineering
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| Research Institution | Nara National College of Technology |
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Principal Investigator |
MATSUSHIMA Tomoshi Nara National Col.of Tech.Elec.Engi., Professor, 電気工学科, 教授 (50165817)
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| Co-Investigator(Kenkyū-buntansha) |
CHO Yoshio Oyokoden Laboratory, Adviser, 顧問
SUETA Tadasi Setsunan University Depart.of Engi., Professor, 工学部, 教授 (20029408)
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| Project Period (FY) |
1997 – 1998
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| Keywords | Fabry-Perot interferometer / Waveguide CO_2 laser / White mirror type gas absorption cell / CdTe electrooptic crystal / HgCdTe photodetector / Wide-band tunable CO_2 laser / High resoluble、high sensitive gas absorption cell |
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| Research Abstract |
Characteristics of the material peculiar absorption wavelength may be utilized for the measuring method of types and concentration such as the pollutant which exists in the atmosphere. Wide-band tunable CO2 laser and high-resolution absorption cell are required when this method is utilized.
An experimental analytical equipment system was constructed, The system consists of four componennts.
The first one is a wideband tunable CO_2 laser by combining a waveguide CO_2 laser with CdTe traveling wave wideband electrooptic phase modulator. A single frequency line selectable C0_2 laser and a wide-bannd electrooptic travelingwave phase modulator were constructed.
The modulator has been composed of the CdTe modultion element (2mmx2mmxl5mm) divided in five in order to enable the wide-bannd modulator. It is possible that the modulator composed of divided modulation element achieves the wide-band modulation by adjusting the phase of microwaves between sections . The microwave transmission characteristics bandwidth of the modulator was 10GHz for one element.
The second one is a high resoluble, high sensitive gas absorption cell. High resoluble high sensitive gas absorption cell which inserted the white mirror (mirror interval 2Ocm, mirror reflectivity 99.7%) in the Fabry-Perot interferometer (mirror interval 6Ocm, mirror reflectivity 98%) was constructed and tested, and 1MHz resolution was obtained.
The last one is an JR HgCdTe photodetector and a storage oscilloscope.
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Research Products
(2 results)
