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Candy_Questions_15_Post

# Candy_Questions_15_Post - 44a Given An LDV system uses a...

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44a . Given : An LDV system uses a red helium-neon laser with wavelength λ = 632.8 nm. The angle between the two beams is α = 9.5 o . The system is used in a small water tunnel with a speed range of -1 to 3 m/s. No Bragg shifting is used. To do : Calculate the expected minimum and maximum frequencies (in units of kHz) generated by the LDV output. Solution : 44b . Given : Same conditions as previous problem: [ An LDV system uses a red helium-neon laser with wavelength = 632.8 nm. The angle between the two beams is = 9.5 o . The system is used in a small water tunnel with a speed range of -1 to 3 m/s. Bragg shifting is used so that we can distinguish between positive and negative velocities. ] To do : Calculate the required frequency shift (absolute value in units of kHz) so that we can measure speeds between -1 and 3 m/s. Solution : 45a . Given : A Pitot-static probe is used to measure air speed in a wind tunnel. The air density is 1.10 kg/m 3 , and the pressure difference is measured with a U-tube manometer
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