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Raj Mootanah
11-05-2001, 12:48 AM
Dear all,

Last week I posted the following message and I am now pleased to share with you the responses obtained.


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Hi all,

I'm looking for a pressure sensor that can measure very low pressure in the range of 2 gramme force ( 0.028 psi). It will be used to measure intra occular pressure of the cornea over an applanation area of diameter 3-4 mm. I'd be glad to receive contact details of suppliers for this type of sensor.

Many thanks.


Raj

Rajshree Mootanah
Research Fellow
Bioengineering Research Group - DaCS
Anglia Polytechnic University
Victoria Road South
Chelmsford
Essex
CM1 1LL
UK
Tel: (44) 1245 493131 ext 3316 / 3028
Fax: (44) 1245 252646

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Dear Mr. Mootanah,

yesterday I found your request on the internet. My name is Jörg Eggers and
work for Samba Sensors AB.

Samba provides a small pressure device, that may be suitable for your use.
The device is only 0.42 mm in diameter and is available in different
pressure ranges. Typically -50 to 150 mbar, -50 to 250 mbar. Sampling
speed: up to 3000 Hz (samples/second). The sensor is manufactured in
silicon and is pure optical, thus free from all electricity.

Please have a look on our web page for more information: www.samba.se

You find my coordinates in the remainder of this mail.

It would be grear to hear your opiniion.

Yours sincerely

Jörg Eggers

--
Samba Sensors AB
Första Långgatan 26
413 28 Göteborg
Sweden
Tel: +49 173 610 51 01 (german phone number)
Fax: +49 173 610 51 37
Cellular: +49 173 610 51 01
mailto:jorg.eggers@samba.se

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Hi Raj,

I just checked MEDLINE using the keywords
intraoccular pressure AND sensor.
There were 33 references. It seems many people are building these sensors, even telemetric ones! Maybe try to contact them?

Jan Herman Kuiper

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Raj,
Just a hint to help in your search. It sounds like you are looking a device
to measure the force required to produce a certain deformation of the cornea
or a device to measure the displacement under a given force. One may be
easier to find than the other. My girlfriend works in the eye and I will ask
her what she uses to measure intra occular pressure.
Good luck,
Chris

/************************************************** **
Christopher J. Poletto, Ph.D.
Biomedical Engineer
Laryngeal and Speech Section
Medical Neurology Branch, NINDS
National Institutes of Health
Building 10, Room 5D38
10 Center Drive, MSC 1416
Bethesda, MD 20892-1416

Phone: (301) 402-1496
FAX: (301) 480-0803


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Hello Raj,

Try the following site, they might have/sell what you're looking for:

www.pimzos.nl

unfortunely, the site is only in Dutch, and I don't have any personal
experience with the firm (except for a demonstration of some of there
sensors), but they have quite a range of sensors from several manufacturers:

On the home-page find the hyperlink DRUK beneath the word SENSOREN
this will lead you to a page with several links to documentation in English.

If you need any more help you're welcome

Good luck,

Wiebe



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Try Honeywell/Microswitch transducers.....
http://catalog.sensing.honeywell.com/sensing/datasheet.asp?PN=163PC01D75&FAM
=Pressure&P=11227
Very stable, low noise, low cost.

Bill Noffsinger, Chief Technologist
Department of Pulmonary Physiology
Respiratory Sleep Disorders
Sir Charles Gairdner Hospital
NEDLANDS, Western Australia, 6009
Phone:+61-8-9346-3756 Fax:+61-8-9346-2034




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Hi Raj!
How are you?
Are you coming to Rome this week?
I bought some pressure sensors from Entran (01923 893999). I
don't know if they make any sensitive enough for your purposes, but
they are probably a good place to start. They make a lot of
miniature load cells as well.
Hopefully I'll see you on Wednesday,
Sam

Dr. Sam Evans,
Medical Engineering Group,
Cardiff University School of Engineering,
PO Box 685, The Parade,
Cardiff CF24 3TA, UK.
Tel. (029) 20 876 876 or (029) 2087 4533
Fax. (029) 2087 4939
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Raj
You have to specify the area over which this force will be applied. I
would say your best bet will be to contact Novel. They might be
able to custom make a censor for you. There web site and contact
details is:

www.novel.de

It is not going to be easy though!!

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Raj:
Try this website:
http://www.wpiinc.com/WPI_Web/pumps/900A.html

The company is world precision instruments. Model 900A Micropressure
systems.
If you buy it, let me know how it works for you, because I am thinking of
getting one to meassure pressure in a single cell.

Also if you find anythng else in your search, I would be delighted to know
of it.
Thanks
Nilay
************************************************** ******
Nilay Mukherjee
Assistant Professor
Departments of Orthopedics and Mechanical and Aerospace Engineering
West Virginia University
Morgantown, WV 26506-9196
Ph: (304) 293-1075
Fax: (304) 293-7070


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