[time-nuts] OCXO sensitive to gravity

J. Forster jfor at quik.com
Sat Aug 15 22:15:54 UTC 2009


Do you mean a quartz manometer? If so, those are many, many kilobucks.
They don't use a quartz crystal, however.

They are Bourdon Tube technology, at least the TI ones are. There is a
helix of fused quartz tubing, like a spiral condensor you'd see in a
chemistry lab, inside a jar. There is a mirror mounted on one end and a
servo system to keep the mirror at null. When positive pressure is
applied, the helix uncurls a bit and the servo turns the whole assembly
and nulls out the mirror. The servo motion is proportional to pressure.
I've used them to measure 1 atm = 760 mm Hg down to better tha 0.01 mm Hg.
They work for absolute or differential pressures. Quartz is used because
it makes a VERY good spring.

Best,
-John

=============

> Yes... it was not cheap, exactly :) It was from this company:
> http://www.paroscientific.com/
>
> Regards,
>
> Javier
>
>
>
> J. Forster escribió:
>> Oh, I know there are quartz transducers like accelerometers, pressure
>> and
>> force gages, etc. from companies like Endevco, Kiag/Krystal, and others.
>> But in my experience they are lab instruments costing a bundle.
>>
>> The airbag sensors are cheap...  likely a buck or twp. Hence the use of
>> silicon.
>>
>> Best,
>> -John
>>
>> ===========
>>
>>
>>> J. Forster escribió:
>>>>
>>>>> As you feel your heart beat, google for Quartz Pressure Sensor
>>>> Again, I think these are semiconductor sensors.
>>>>
>>> Yes, but there are also quartz pressure sensors. Long time ago I used a
>>> equipment to measure water columns (and hence sea waves height) that
>>> used a quartz-based pressure sensor. It was a very sensitive equipment.
>>>
>>> Regards,
>>>
>>> Javier
>>>
>>> --
>>> ------------------------------------------------------------------------
>>> Javier Herrero                            EMAIL:
>>> jherrero at hvsistemas.com
>>> HV Sistemas S.L.                          PHONE:         +34 949 336
>>> 806
>>> Los Charcones, 17A                        FAX:           +34 949 336
>>> 792
>>> 19170 El Casar - Guadalajara - Spain      WEB:
>>> http://www.hvsistemas.com
>>>
>>>
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>>
>>
>>
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>
> --
> ------------------------------------------------------------------------
> Javier Herrero                            EMAIL: jherrero at hvsistemas.com
> HV Sistemas S.L.                          PHONE:         +34 949 336 806
> Los Charcones, 17A                        FAX:           +34 949 336 792
> 19170 El Casar - Guadalajara - Spain      WEB: http://www.hvsistemas.com
>
>
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