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Investigating An Anemometer.

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Introduction

Investigating An Anemometer I decided to investigate anemometers, because I wanted to look at different ways of measuring wind speed. I decided to build two different types of anemometers and test them to see which one was more accurate and which one would work better at different wind speeds. I looked on the internet and decided to look at cup and propeller anemometers. My first task was to look at how to build a cup anemometer and what is the best way of designing and building it. 1. "The three cup anemometer is recommended; this design has been shown to exert a more uniform torque throughout a revolution. The rate of rotation of the cups is essentially linear over the normal range of measurements, with the linear wind speed being about 2 to 3 times the linear speed of a point on the center of a cup, depending on the dimensions of the cup assembly and the materials from which the sensor is made." I chose to build my cup anemometer our of a cork, two metal polls going through the center of the cork and 4 half table tennis balls glued to the end of the two metal rods. I then attached the cork onto a motor, which I would use to measure the amount of volts produced by the cup anemometer. ...read more.

Middle

0.96 0.107 3.72 1.024 0.113 3.87 1.074 0.119 3.95 1.145 0.121 4.11 1.198 0.125 4.23 1.251 0.129 4.4 1.294 0.133 2."There are several propeller anemometers which employ lightweight molded plastic or polystyrene foam for the propeller blades to achieve threshold speeds of 0.5 m/s. This type of anemometer may be applied to collecting mean wind speeds for input to models to determine dilution estimates and/or transport estimates. Because of their relatively quick response times, some having distance constants of about one meter, these sensors are also suitable for use in determining the standard deviation of the along-wind-speed fluctuations, u . Care should be taken, however, in selecting a sensor that will provide an optimal combination of such characteristics as durability and sensitivity for the particular application." I also looked at my project on Picoscope on the computer, which helped me understand what the propeller was doing as it spun around. I produced this picture from the Picoscope. This shows the amount of volts being produced in 1 second. I blew the propeller just as I marked 1 second on the Picoscope. From the results of the 3 different anemometers I managed to produce this graph on excel. This shows both the cup and the propeller anemometers. From this graph you can see that the cup anemometer which is in pink produced very little volts from the same amount of wind as the propeller anemometer. ...read more.

Conclusion

Electrical-contact transducers are used to measure the "run-of- the-wind";i.e., the amount of air (measured as a distance) passing a fixed point in a given time interval; wind speed is calculated by dividing run-of-the-wind measurements by the time interval"(3) This extract explains how it is possible to measure a turning object such a propeller. You can do it in a number of ways such as using an LDR (light sensitive resistor) and measure the amount of pulses it gives off. however for my project I looked at using a voltmeter to measure the amount of volts given off, because I found this the easiest way and the most accurate way of getting results without them being too difficult to obtain. I also investigated different ways of measuring wind speed such as a weather vain that u could put into the wind and measure the change in angle using either a LDR or a strain gauge that could measure the amount of strain being put on the vain by the wind. A wind sock can also be used to see the intensity of the wind, however this is very inaccurate and it is only possible to see if there is no wind or lots of wind. A wind sock can also be used to tell the direction of the wind which is an added advantage. ...read more.

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