| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an optical hydrogen gas and hydrocarbon gas sensor capable of detecting simultaneously hydrogen gas and hydrocarbon gas. <P>SOLUTION: A catalyst for hydrocarbon detection wherein the absorbance in a prescribed infrared absorption wavelength band is changed in contact with hydrogen gas is arranged in a detection space, and laser light wherein the light wavelength is swept in a wavelength range including an infrared absorption wavelength of hydrocarbon gas and included in the infrared absorption wavelength band of the catalyst and the light wavelength and the light intensity are modulated by a sine wave (used as a fundamental wave) by using the swept light wavelength as a center wavelength is irradiated into the detection space. Light transmitted through the catalyst is received, and hydrogen gas is detected from the magnitude of a signal synchronized with the fundamental wave included in a received light intensity signal, and hydrocarbon gas is detected from the magnitude of a signal synchronized with double waves included in the received light intensity signal. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
