Fabrication and characterization of an infrared-absorption-type CO2 gas sensor using a PLZT optical shutter
✍ Scribed by Yoshiharu Taniguchi; Kensuke Murakami; Shinichi Murashige; Hiroshi Kobayashi; Shosaku Tanaka
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 165 KB
- Volume
- 82
- Category
- Article
- ISSN
- 8756-663X
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✦ Synopsis
In aiming to improve the performance and reliability of infrared absorption type CO 2 gas sensors, a high-sensitivity bulk thin-plate-type pyroelectric infrared sensor and an infrared-absorption-type CO 2 gas sensor using electrooptic chopping have been fabricated and their performance studied. In a gas sensor combining a conventional bulk-type pyroelectric sensor and a mechanical chopper, a detection sensitivity of 0.029 mV/ppm for a unit concentration is obtained. On the other hand, if the bulk thin-platetype pyroelectric sensor is used, the sensitivity is 0.12 mV/ppm, which is four times as great. When a bulk thinplate-type pyroelectric sensor and a PLZT optical shutter are combined, the sensitivity is 0.026 mV/ppm. Hence, a highly reliable CO 2 sensor that eliminates the mechanical chopper with a performance equivalent to that of the conventional type can be realized.