Why is Direct Detection of Doppler Frequency Shift Impractical in Laser Doppler Anemometry?

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Direct detection of the Doppler frequency shift in laser Doppler anemometry is impractical due to limitations in conventional spectrometers, which struggle with the required sensitivity and resolution. Using a single beam simplifies the setup and enhances measurement reliability by reducing noise and interference from multiple sources. The technique relies on the interference of reflected light from particles in the air, where the frequency shift is measured by analyzing the resulting interference pattern. To demonstrate the impracticality of direct detection, one could compare the performance of different detection methods under varying conditions. Understanding these principles is crucial for effectively utilizing laser Doppler anemometry in experiments.
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I am doing an experiment in the lab at the moment on laser doppler anemometry and a few questions have popped into mind, was wondering if anyone had any ideas/insights on them:

Direct detection of the Doppler frequency shift using conventional prism or grating spectrometers is not usually practical, why? How could I show this?

Also, why use just one beam? And not two for laser doppler anemometry?
 
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In order for me to try to answer at your questions plese explain me how it works laser anemometry.
I suppose that you use reflection of light by the air and you make reflected and original beam interfere with each other. Please explain me into more details.
And how do you measure the frequency shift?
 

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