| 摘要 |
In keeping with one aspect of this invention, apparatus for measuring the flow of gas in a pipeline includes an optical transmitter, an optical receiver and a processor. The apparatus measures the flow of gas through a generally cylindrical gas pipeline, engine intake or the like. The transmitter includes a laser diode array and a collimator lens which are preferably located outside of the pipeline, or in the wall of the pipeline. The transmitter generates multiple, spaced, discrete laser spots in the pipeline. Particles in the gas scatter the light as they pass through it, and the scattered light is received by another collimator lens and photodetector, which are also preferably outside of or in the wall of the pipeline. The output of the photodetector is processed by a computer which calculates the velocity of the particles and hence the flow rate of the gas. Pre-recorded holographic film can also be used in the transmitter and receiver to create holographic images at several different radii in the pipeline. In that case, the computer also calculates the volumetric flow rate of gas flowing through different parts of the pipeline, and can reveal the presence of turbulence in the pipeline.
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