PSN-L Email List Message

Subject: Re: LD701 sensor for Lehman
From: ChrisAtUpw@.......
Date: Mon, 14 Aug 2006 21:44:19 EDT


In a message dated 14/08/06, mike8s2@......... writes:

> I saw a Lehman which used this as the sensor - what do you guys think 
> (sensitivity, bandwidth, noise floor, etc.):
> 
> http://www.omega.com/pptst/LD701.html

Hi Mike,

       You tell us the noise floor, the bandwidth etc and we can maybe give a 
realistic answer. The 10 micron repeatability does not sound exciting when 
you want to measure at least down to 0.1 micron. At $165, I am not going to buy 
one to find out.
       I suspect that the bandwidth is likely to be too high allowing extra 
noise. 
       Is there any attractive effect due to energisation of the sensor?
       I would like to see some more figures and a direct comparison, please.
       The commercial LVDTs that I have used are only OK if you make very low 
noise electronics to go with them. 

       Regards,

       Chris Chapman
       
In a me=
ssage dated 14/08/06, mike8s2@......... writes:

I saw a Lehman which used this=20= as the sensor - what do you guys think (sensitivity, bandwidth, noise floor,= etc.):

http://www.omega.com/pptst/LD701.html


Hi Mike,

       You tell us the noise floor, the bandwi= dth etc and we can maybe give a realistic answer. The 10 micron repeatabilit= y does not sound exciting when you want to measure at least down to 0.1 micr= on. At $165, I am not going to buy one to find out.
       I suspect that the bandwidth is likely=20= to be too high allowing extra noise.
       Is there any attractive effect due to e= nergisation of the sensor?
       I would like to see some more figures a= nd a direct comparison, please.
       The commercial LVDTs that I have used a= re only OK if you make very low noise electronics to go with them.

       Regards,

       Chris Chapman
      

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