| 摘要 |
A gas measuring method, apparatus and system for measuring a concentration of a gas of interest is disclosed. The gas concentration is based on a propagation delay of a sonic or ultrasonic wave as the wave travels through the gas. The propagation delay is measured such that delay contributions from sources other than the gas itself are canceled. A sensor in accordance with the invention includes an sonic or ultrasonic transmitter and receiver, and a control module for performing calculations. The sensor can be used in various applications, including on-board inert gas generating systems (OBIGGS).
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