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LVDT Reversibility?
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Jerry Avins
science forum Guru


Joined: 03 May 2005
Posts: 534

PostPosted: Sat Jul 15, 2006 12:07 am    Post subject: Re: LVDT Reversibility? Reply with quote

O5O wrote:


Quote:
... The linear actuator is the only plan at this time to drive the stub
tuners.

OK. I have your address.

Jerry
--
Engineering is the art of making what you want from things you can get.
ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
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O5O
science forum beginner


Joined: 03 Jun 2006
Posts: 14

PostPosted: Sat Jul 15, 2006 12:34 am    Post subject: Re: LVDT Reversibility? Reply with quote

"Jerry Avins" <jya@ieee.org> wrote in message
news:PbadnXoudbj1NSrZnZ2dnUVZ_qGdnZ2d@rcn.net...
Quote:
O5O wrote:
"Setanta" <a@a.aaa> wrote in message
news:KQDtg.1701$v02.223@newsfe3-gui.ntli.net...
is it possible to use stub tuners rather than a sliding short -
rotation is
probably easier to control.



Actually I have both stub tuners and sliding shorts in the design. The
sliding shorts terminate each end of the waveguide, and are moveable to make
sure that the end reflections are exacly 1/4 wavelength from the microwave
tube element and the focusing nozzle. Once these have been adjusted manually
and set, they are locked into place and will never move after that. Three
stub tuners are located between the magnetron element and the circulator.
One of these will be selected to be driven by the linear actuator. The other
two are manually operated. The idea here is that the two manual tuners can
be set for rough or coarse adjustments depending on the feedstock
requirements, and the third stub tuner will be driven with the linear
actuator for fine / variable adjustments while processing.

Chris. T.
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O5O
science forum beginner


Joined: 03 Jun 2006
Posts: 14

PostPosted: Sat Jul 15, 2006 12:57 am    Post subject: Re: LVDT Reversibility? Reply with quote

"Jerry Avins" <jya@ieee.org> wrote in message
news:woydnfoNgYkrrCXZnZ2dnUVZ_qqdnZ2d@rcn.net...
Quote:
OK. I have your address.

I still haven't got your WalkNet address.

Chris.
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Jerry Avins
science forum Guru


Joined: 03 May 2005
Posts: 534

PostPosted: Sat Jul 15, 2006 1:27 am    Post subject: Re: LVDT Reversibility? Reply with quote

O5O wrote:
Quote:
"Jerry Avins" <jya@ieee.org> wrote in message
news:woydnfoNgYkrrCXZnZ2dnUVZ_qqdnZ2d@rcn.net...
OK. I have your address.

I still haven't got your WalkNet address.

WalkNet? That's beyond me.

Jerry
--
Engineering is the art of making what you want from things you can get.
ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
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Setanta11
science forum beginner


Joined: 17 Nov 2005
Posts: 45

PostPosted: Mon Jul 17, 2006 12:18 am    Post subject: Re: LVDT Reversibility? Reply with quote

"O5O" <Christoffur-No-SpamIt-050@Verizon.Net> wrote in message
news:0KWtg.179$RV.70@trnddc08...
Quote:
"Jerry Avins" <jya@ieee.org> wrote in message
news:PbadnXoudbj1NSrZnZ2dnUVZ_qGdnZ2d@rcn.net...
O5O wrote:
"Setanta" <a@a.aaa> wrote in message
news:KQDtg.1701$v02.223@newsfe3-gui.ntli.net...
is it possible to use stub tuners rather than a sliding short -
rotation is
probably easier to control.



Actually I have both stub tuners and sliding shorts in the design. The
sliding shorts terminate each end of the waveguide, and are moveable to
make
sure that the end reflections are exacly 1/4 wavelength from the microwave
tube element and the focusing nozzle. Once these have been adjusted
manually
and set, they are locked into place and will never move after that. Three
stub tuners are located between the magnetron element and the circulator.
One of these will be selected to be driven by the linear actuator. The
other
two are manually operated. The idea here is that the two manual tuners can
be set for rough or coarse adjustments depending on the feedstock
requirements, and the third stub tuner will be driven with the linear
actuator for fine / variable adjustments while processing.

Chris. T.


Is it possible to control tuning by varying the distance the screw is in

the waveguide?

What kinda frequency and power are you at?

Setanta
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O5O
science forum beginner


Joined: 03 Jun 2006
Posts: 14

PostPosted: Mon Jul 17, 2006 6:44 am    Post subject: Re: LVDT Reversibility? Reply with quote

"Setanta" <a@a.aaa> wrote in message
news:MHAug.14421$EK1.7275@newsfe4-gui.ntli.net...
Quote:

Is it possible to control tuning by varying the distance the screw is in
the waveguide?

Yes. In my microwave class (2002) we installed capacative and inductive
loads into a waveguide by inserting a thin plate with a small rectangular
hole in the center in between two of the waveguide sections. The circuit was
tuned using a simple rotary micrometer. A screw device with 1/1000 "
graduations marked on the side that drove a tuning pin into a lobe of the
microwave E-Field. We made some before and after measurements and then
calculated the resulting impedance of the load using a Smith chart.

Quote:

What kinda frequency and power are you at?


2450 MHz @ 1 Kw. These are scrapped parts from an old Sanyo microwave oven I
found at the Salvation Army surplus store.

http://christoffur.hopto.org/Photos/2004/11/09/lo/pict0037.jpg

This should be enough power to get some plasma generation, but I don't know
yet that it will be sufficient for real material processing. I will probably
need to upgrade to higher power components later on, but I am hoping that
this 1Kw power level will be good enough to do some small sample runs and
get some working data.

The problem I am having right now is finding high power waveguide equipment
at a price that I can afford. It looks like I am going to have to fabricate
my own dummy load and circulator as well before it is all done.
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Setanta11
science forum beginner


Joined: 17 Nov 2005
Posts: 45

PostPosted: Mon Jul 17, 2006 12:27 pm    Post subject: Re: LVDT Reversibility? Reply with quote

"O5O" <Christoffur-No-SpamIt-050@Verizon.Net> wrote in message
news:nlGug.1992$us.822@trnddc04...
Quote:
"Setanta" <a@a.aaa> wrote in message
news:MHAug.14421$EK1.7275@newsfe4-gui.ntli.net...

Is it possible to control tuning by varying the distance the screw is
in
the waveguide?

Yes. In my microwave class (2002) we installed capacative and inductive
loads into a waveguide by inserting a thin plate with a small rectangular
hole in the center in between two of the waveguide sections. The circuit
was
tuned using a simple rotary micrometer. A screw device with 1/1000 "
graduations marked on the side that drove a tuning pin into a lobe of the
microwave E-Field. We made some before and after measurements and then
calculated the resulting impedance of the load using a Smith chart.


What kinda frequency and power are you at?


2450 MHz @ 1 Kw. These are scrapped parts from an old Sanyo microwave oven
I
found at the Salvation Army surplus store.

http://christoffur.hopto.org/Photos/2004/11/09/lo/pict0037.jpg

This should be enough power to get some plasma generation, but I don't
know
yet that it will be sufficient for real material processing. I will
probably
need to upgrade to higher power components later on, but I am hoping that
this 1Kw power level will be good enough to do some small sample runs and
get some working data.

The problem I am having right now is finding high power waveguide
equipment
at a price that I can afford. It looks like I am going to have to
fabricate
my own dummy load and circulator as well before it is all done.

Sounds like an interesting project


have been involved in similar type of thing using a circular cavity -
pulling a glass fibre 'rope' through it that had been dipped in a curing
agent - continuous curing of a fibreglass rebar for concrete-

Be intersted toknow a little more about the criteria for developing a plasma
in the system - is there a gas emplyed -apart from air-

setanta
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O5O
science forum beginner


Joined: 03 Jun 2006
Posts: 14

PostPosted: Mon Jul 17, 2006 7:31 pm    Post subject: Re: LVDT Reversibility? Reply with quote

"Setanta" <a@a.aaa> wrote in message
news:enLug.7574$i32.1564@newsfe2-gui.ntli.net...
Quote:
Sounds like an interesting project

have been involved in similar type of thing using a circular cavity -
pulling a glass fibre 'rope' through it that had been dipped in a curing
agent - continuous curing of a fibreglass rebar for concrete-

Be intersted toknow a little more about the criteria for developing a
plasma
in the system - is there a gas emplyed -apart from air-

setanta



I am just learning about these techniques now myself, so am probably not the
best person to ask.

These documents are several years old now, but maybe they can help point you
in the right direction.

http://psfcwww2.psfc.mit.edu/library/99ja/99ja008/99ja008_full.pdf

Some IEEE Documents I found interesting that you can get from IEEE XPlore if
you are a member, or if your library has an IEEE account.

http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?puNumber=27
Ahmed I. Al-Shamma'a, Stephen R. Wylie, Jim Lucas, and Jiu Dun
Yan,"Atmospheric Microwave Plasma Jet for Material Processing", IEEE
TRANSACTIONS ON PLASMA SCIENCE, VOL. 30, NO. 5, OCTOBER 2002 Page: 1863

Abstract-We have designed a low-cost and reliable 2.45-GHz waveguide-based
applicator to generate a microwave plasma jet (MPJ) at atmospheric pressure.
The MPJ system consists of a 1-6 kW magnetron power supply, a circulator, a
water-cooled matched load and the applicator. The applicator includes a
tuning section, which is required to reduce the reflected power and the
nozzle section. The plasma is formed by the interaction of the high
electrical field, generated by the microwave power, between the waveguide
aperture and the gas nozzle. A variety of gasses have been used to produce
the plasma including argon, helium, and nitrogen. A 2-kW 2.45-GHz MPJ
constructed using a rectangular waveguide WG9A (WR340) has been
investigated. An MPJ has been used for material processing applications
including cutting, welding, glass vitrification, and quartz/ceramic
processing. This paper discusses the design parameters and the potential of
the MPJ for industrial applications and how the jet can be tailored to suit
different tasks, by adjusting the various parameters such as the type of
gas, the flow rate, the input power, and the nozzle design. Index
Terms-Electrical field simulation, industrial applications, material
processing, microwave plasma, waveguide.

Paul P. Woskov, Senior Member, IEEE and Kamal Hadidi, Member, IEEE, "Large
Electrodeless Plasmas at Atmospheric Pressure Sustained by a Microwave
Waveguide", IEEE TRANSACTIONS ON PLASMA SCIENCE, VOL. 30, NO. 1, FEBRUARY
2002 Page: 156

Abstract-A 1.5-kW 2.45-GHz magnetron source has been used to reliably
sustain large electrodless plasmas at atmospheric pressure in a shorted
waveguide without a resonator. Working gases have been air, nitrogen, and
heated off gases of sulfur containing ores and coal in nitrogen. Various
colorful plasmas of value to environmental monitoring and processing
applications are generated depending on the composition of the working gas.
Index Terms-Atmospheric pressure, electrodes, microwave, plasma.
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Setanta11
science forum beginner


Joined: 17 Nov 2005
Posts: 45

PostPosted: Tue Jul 18, 2006 9:25 am    Post subject: Re: LVDT Reversibility? Reply with quote

"O5O" <Christoffur-No-SpamIt-050@Verizon.Net> wrote in message
news:yARug.6693$k31.5482@trnddc06...
Quote:
"Setanta" <a@a.aaa> wrote in message
news:enLug.7574$i32.1564@newsfe2-gui.ntli.net...
Sounds like an interesting project

have been involved in similar type of thing using a circular cavity -
pulling a glass fibre 'rope' through it that had been dipped in a curing
agent - continuous curing of a fibreglass rebar for concrete-

Be intersted toknow a little more about the criteria for developing a
plasma
in the system - is there a gas emplyed -apart from air-

setanta



I am just learning about these techniques now myself, so am probably not
the
best person to ask.

These documents are several years old now, but maybe they can help point
you
in the right direction.

http://psfcwww2.psfc.mit.edu/library/99ja/99ja008/99ja008_full.pdf

Some IEEE Documents I found interesting that you can get from IEEE XPlore
if
you are a member, or if your library has an IEEE account.

http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?puNumber=27
Ahmed I. Al-Shamma'a, Stephen R. Wylie, Jim Lucas, and Jiu Dun
Yan,"Atmospheric Microwave Plasma Jet for Material Processing", IEEE
TRANSACTIONS ON PLASMA SCIENCE, VOL. 30, NO. 5, OCTOBER 2002 Page: 1863

Abstract-We have designed a low-cost and reliable 2.45-GHz waveguide-based
applicator to generate a microwave plasma jet (MPJ) at atmospheric
pressure.
The MPJ system consists of a 1-6 kW magnetron power supply, a circulator,
a
water-cooled matched load and the applicator. The applicator includes a
tuning section, which is required to reduce the reflected power and the
nozzle section. The plasma is formed by the interaction of the high
electrical field, generated by the microwave power, between the waveguide
aperture and the gas nozzle. A variety of gasses have been used to produce
the plasma including argon, helium, and nitrogen. A 2-kW 2.45-GHz MPJ
constructed using a rectangular waveguide WG9A (WR340) has been
investigated. An MPJ has been used for material processing applications
including cutting, welding, glass vitrification, and quartz/ceramic
processing. This paper discusses the design parameters and the potential
of
the MPJ for industrial applications and how the jet can be tailored to
suit
different tasks, by adjusting the various parameters such as the type of
gas, the flow rate, the input power, and the nozzle design. Index
Terms-Electrical field simulation, industrial applications, material
processing, microwave plasma, waveguide.

Paul P. Woskov, Senior Member, IEEE and Kamal Hadidi, Member, IEEE, "Large
Electrodeless Plasmas at Atmospheric Pressure Sustained by a Microwave
Waveguide", IEEE TRANSACTIONS ON PLASMA SCIENCE, VOL. 30, NO. 1, FEBRUARY
2002 Page: 156

Abstract-A 1.5-kW 2.45-GHz magnetron source has been used to reliably
sustain large electrodless plasmas at atmospheric pressure in a shorted
waveguide without a resonator. Working gases have been air, nitrogen, and
heated off gases of sulfur containing ores and coal in nitrogen. Various
colorful plasmas of value to environmental monitoring and processing
applications are generated depending on the composition of the working
gas.
Index Terms-Atmospheric pressure, electrodes, microwave, plasma.



dont know if your familiar with the work done by

either AC Metaxas or/and R Meredith

in particular

Industrial Microwave Heating (by both authors)

this is an IEE publication - and is my microwave hands on bible and there is
some good stuff on plasma

setanta
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O5O
science forum beginner


Joined: 03 Jun 2006
Posts: 14

PostPosted: Tue Jul 18, 2006 9:39 am    Post subject: Re: LVDT Reversibility? Reply with quote

"Setanta" <a@a.aaa> wrote in message
news:hO1vg.46294$Z61.19581@newsfe4-win.ntli.net...
Quote:


dont know if your familiar with the work done by

either AC Metaxas or/and R Meredith

in particular

Industrial Microwave Heating (by both authors)

this is an IEE publication - and is my microwave hands on bible and there
is
some good stuff on plasma


No. Not yet... But I will definitely look them up and see what they have to
say. Thanks.

Chris. T.
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