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  1. Figure 1 shows a hot-wire anemometer probe. Typical dimensions of the wire sensor are 0.00015 to 0.0002 inches (0.0038 to 0.005 mm) in diameter and 0.040 to 0.080 inches (1.0 to 2.0 mm) long. This is the type of hot wire that has been used for such measurements as turbulence levels in wind tunnels, flow patterns around models and blade wakes in ...

  2. In film gauges a 1 to 5 μm thick film is deposited on a cone-, wedge-, or cylinder-shaped substrate for measuring velocity or on a plane substrate for measuring shear stresses on the wall. The gauge sensitivity to the flow velocity is provided by having the wire or film temperature T w substantially higher than the flow temperature T f , which is achieved by heating it by electric current.

  3. The sensor may either be a thin wire suspended between two prongs or a thin metal film deposited on an electrically insulating substrate. Film sensors can be cylindrical (fiber-film probes) or non-cylindrical (film probes). Wire sensors are used in gases and in non-conducting liquids, while film sensors are primarily designed for use in water and other conducting liquids.

  4. Describes methods of measuring the three-dimensional flow field using a three-sensor hot-wire probe, with emphasis on the techniques developed by the author's group at the Pennsylvania State University. The hot-wire equations, data processing procedure, calibration techniques, and a discussion of various errors in the measurement are included. Some typical data acquired by thisprobe is also ...

  5. Firstly, the chromium film was deposited on SU-8 pillars as the adhesion layer with a thickness of near 50 nm, and then the gold film was subsequently deposited with a thickness of near 250 nm to ...

  6. The X probe is used to measure two velocity components. Writing the equations for the effective velocity for the two sensors “A” and “B” with the mean velocity in the plane of the two sensors V. 3 = 0 and. a. = the angle between V and sensor B gives: Equation 12. 2 2 V 2 A ,eff = ( V 1 cos α 1 - V 2 sin α 1 ) + v 3.

  7. Abstract. Hot wire and hot film sensors are used for measurements of fluctuations in the wind. Such anemometers are in competition with both mechanical and sonic anemometers. At least some of the mechanical sensors are more stable in calibration, and less expensive. The high frequency resolution of the hot wire/hot film sensors, however, cannot ...