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mihotron
Joined: 13 Jun 2001
Posts: 36
Location: Bulgaria
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 22 Jan 2003 18:24 flow measurement contactless |
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| anyone have idea
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flatulent
Joined: 19 Jul 2002
Posts: 4856
Helped: 292
Location: Middle Earth
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| 22 Jan 2003 18:28 electromagnetic method |
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One standard method of the flow material has any conductance is to use the Hall effect in what is called the electromagnetic flow meter. You run the fluid through a rectangular cross section area and put an AC magnetic field across one pair of opposite faces and electrodes on the other two faces. You measure the voltage on them with a high impedance volt meter.
Another method that only works for high speed flow is ultrasonic doppler. You TX from one sensor along the flow direction and RX the reflected signal and compare the frequencies. This can be made contactless by putting the sensors at the end of a rectangular box shape area and run the fluid in one side and out the other.
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mihotron
Joined: 13 Jun 2001
Posts: 36
Location: Bulgaria
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| 22 Jan 2003 22:17 |
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| is ultrasonic method is applicable only for high speed flow?
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Rostfrei
Joined: 17 Sep 2001
Posts: 54
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| 23 Jan 2003 7:45 |
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| Flatulent...do you have any schemas or web links for your ideas. Could it be done at home ?
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flatulent
Joined: 19 Jul 2002
Posts: 4856
Helped: 292
Location: Middle Earth
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| 23 Jan 2003 16:50 two answers |
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For the first question above, the flow speed has to be high in order to get a useful frequency shift. An example is that fuel flow in an truck is too slow to work, fuel flow in an airplane is fast enough to work.
These instruments are developed in industrial or university laboratories. I suspect that individuals or small businesses do not have the tools to do a good job of designing one. I do not have any documents about them.
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mihotron
Joined: 13 Jun 2001
Posts: 36
Location: Bulgaria
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| 23 Jan 2003 17:04 |
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| do you know some companies that make ultrasonic sensors
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sirilim
Joined: 16 Jan 2002
Posts: 14
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| 23 Jan 2003 17:06 |
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Hi,
Another type is coriolis mass flow meter. It will give the direct mass flow rate. Also it can we convert to volume becuase in the transmitter have the function to convert it.
For liquid measurement now, API already approved and it have installed a lot in the factory.
It is very popular low since the accuracy quite good, high turn down ratio and less maintenance.
Bye,
sirilim
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trader
Joined: 10 Sep 2002
Posts: 158
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| 24 Jan 2003 1:38 |
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Some useful info
h**p://www.maxim-ic.com/appnotes.cfm/appnote_number/884
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flatulent
Joined: 19 Jul 2002
Posts: 4856
Helped: 292
Location: Middle Earth
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| 24 Jan 2003 1:56 sensor material |
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| I only know of some companies that sell only in large (expensive) quantities. Coors is one. Look up the key word Piezoelectric on a search engine. These are sold in large sheets with the thickness (and therefore the resonant frequency) not coltrolled very well.
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balbes
Joined: 12 May 2002
Posts: 22
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| 24 Jan 2003 15:15 |
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You can also heat your liquid and measure the temperature in two points on the same distance from the heating point and see the difference that will be proportional to the flow speed
b.t.w. it must be much cheaper than ultrasound
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