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Wedge Probe
What is a wedge probe ?Where can I get more details about it ?
The wedge probe (see below) is a simple, rugged, two- or three-dimensional probe that consists of a triangular, prismatic probe. It can be used to measure the static pressure. It has been made with various angles, the most popular being between about 8 deg. and 30 deg. The upper limit to the useful operating range of Mach numbers is a function of the angle and the flow pitch angle. It is lower for probes with greater included angles. Narrower wedges are, however less sensitive to flow angle but they do offer better accuracy in terms of static pressure measurement.
Here's the complete detail with its illustration:
http://www-g.eng.cam.ac.uk/whittle/current-research/hph/pressure-probes/pressure-probes.html
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Pick Wedge Tool Black Pry Stick Probe Spudger Plastic Hook Soldering Solder Part |  |
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Power Probe PPRPPMT09 Wedge Solder Tip $19.68 Huge selection to choose from. Satisfaction ensured. High quality components. Dimensions: 4.5 L x 3.5 W x 0.25 H. |
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Oakton RTD Probe
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Evaluation of a Wedge on a Force Balance As a Flow Angle Probe AEDC-TR-74-110
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DescriptionPropulsion Wind Tunnel Facility |
Minnesota wedge tornado intercept!!! June 17, 2010
What is wedge pressure? What's 'wedgy' about it? and why don't we measure it through subclavian/femoral artery?
Central venous pressure is when we pass venous catheter into right atrium and there the probe picks up roughly 3mmHg pressure, the central venous pressure. In contrast, to estimate left atrial pressure we pass the probe all the way down along pulmonary artery to its most distal end near the lung. What's on the other side of the lung if we were to keep going (but couldn't ofcourse) is the left atrium. That's the wedge pressure which measures around 8mmHg.
My questions are (1) why is it called wedge? where's the 'wedge'? (2) Why can't we just go up femoral artery or subclavian artery, through aortic valve, into left ventricle, then through mitral valve to reach directly into left atrium? that'll be more accurate wouldn't it?
An intravascular pressure recording obtained when a recording catheter is wedged in–ie, occludes–a vessel, which allows assessment of cardiopulmonary pressure gradients.
the difficulty of introducing a cath against the pressure gradient and it is against the flow, measurement may become inaccurate, other thing is the valve opens towards the ventricle. i think you got both.
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