Re: power....Re: Tesla Receiver Coil ..........success?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Mike" <induction@xxxxxxxxxxx>

Hi Gary,
             If you have copper tubing on your primary or if you are 
going to use a water cooled load this may help.
We use this in induction heating all the time to see how much power 
is getting from the induction coil to a load.
Say the target is going to be steel pipe and we wish to know what the 
heater will do, in kilowatts, to that load.
We take a pipe, add hose fittings and flow water through it so we can 
measure short or long term, the delivered power.
We use two thermometers, one on the input water, one on the output.
We also place a flow meter or vertical tube and ball so we know the 
rate of flow.
This setup is for degrees in F and US Gallons per minute. No metric 
conversion needed.
Take the input temp and the output temp through the load without 
power so be sure both are reading the same.
If different, consider the difference in the final numbers.
Now apply power, measure the difference in degrees F from input to 
output, say it is 10 degrees.
Take that 10 degrees (F) and multiply times the rate of water flow, 
say it is 10 GPM (Lets do a reasonably big coil here for you).
Now take that number on the calculator and multiply by .146 (point 
146) and the resulting number is in kilowatts.
So, temp difference is 10 F  times 10 GPM  = 
100  times  .146  =  14.6 kilowatts
Another; Say 8 degrees (F) difference, 5 GPM times .146 =  5.84 kilowatts.
It is realistic to be able to get 5 GPM through 3/8 tubing at usual 
street pressures.
You can also scale the flow down so the water is in the load longer.
Google gave many hits but this system is simple. If you do not have a 
flow meter, clock how long the water takes to fill one gallon and 
apply that number. Then you only need to measure the temperature. If 
your supply water temperature is really constant, and you only have 
one temperature indicator measure that to conform then move it to the output.
Inexpensive method but it works.
You can use the same non-conductive hose we do, for isolation from 
ground. Available in 1/4, 3/8, 1/2 , 5/8 and one inch.
Stuff is good for 1 kV per foot.
Hope this helps,
Mike

----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Sunday, October 30, 2005 6:32 PM
Subject: Re: power....Re: Tesla Receiver Coil ..........success?


> Original poster: "Gary Peterson" <gary@xxxxxxxxxxxx>
>
>
> > Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>
>
> > > > What is the procedure for determining the RF power input to an SSTC
> > > > operating from a pure DC power supply?
>
> > . . . you can use any of the bolometric techniques to accurately 
> > measure the power. . . .
>
> Would a bolometric measurement of a dummy load having the same 
> resistance as an SSTC's primary coil give a fairly accurate value 
> for the RF input current?
>
> Where on the web can I learn more about bolometric RF power 
> measurement techniques?