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Cobra probes come in three-, four-, and five-hole configurations, the former used for two-dimensional flow measurement, the latter two for three-dimensional flow measurement. In the three-hole kind of instrument, there are two yaw direction tubes which are chamfered and silver soldered symmetrically on the two sides of a pitot tube.
Multi-hole Ceramic (MHC) Series - Non-isolating fitting for multiple elements up to 0.125 in (3.175 mm) diameter; Multi-hole Metal (MHM) Series - A flexible design for special hole patterns, irregular shapes, and mixtures of element sizes; Split (PGS/SPG/DSPG) Series - For sealing elements that can pass through gland body but not the internal ...
Some pitot–static systems incorporate single probes that contain multiple pressure-transmitting ports that allow for the sensing of air pressure, angle of attack, and angle of sideslip data. Depending on the design, such air data probes may be referred to as 5-hole or 7-hole air data probes.
In these kinds of measurements, the most practical instrument to use is the pitot tube. The pitot tube can be inserted through a small hole in the duct with the pitot connected to a U-tube water gauge or some other differential pressure gauge for determining the flow velocity inside the ducted wind tunnel. One use of this technique is to ...
The tube is pointed into the flow and the difference between the stagnation pressure at the tip of the probe and the static pressure at its side is measured, yielding the dynamic pressure from which the fluid velocity is calculated using Bernoulli's equation. A volumetric rate of flow may be determined by measuring the velocity at different ...
Optical probes and laser probes can be used (if possible in combination), which change CMMs to measuring microscopes or multi-sensor measuring machines. Fringe projection systems, theodolite triangulation systems, and laser distance and triangulation systems are not called measuring machines, but the measuring result is the same: a space point ...