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-b...
What is claimed is: 1. A gas measuring device for measuring a concentration of a gas of interest, the gas of interest being one component of a gas having at least two different components, comprising: a transmitter for generating a sonic or ultrasonic wave; a receiver for detecting the sonic or ultrasonic wave; a reflector positioned to reflect back to the receiver the sonic or ultrasonic wave after having previously been detected by the receiver; and a processor operatively coupled to the transmitter and receiver, said processor operative to measure a ...
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