Searching \ for '[EE]:Software temp. compensation of pressuire sens' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page:
Search entire site for: 'Software temp. compensation of pressuire sens'.

Exact match. Not showing close matches.
PICList Thread
'[EE]:Software temp. compensation of pressuire sens'
2001\01\30@055226 by mike

I'm after any info or apnotes anyone may know of that discuss software
techniques for temperature-compensating silicon pressure sensors
Basically what I want to do is use low-cost sensors (<US$30 in low
volume), a high-resolution A/D converter, and do all temperature
compensation, linearisation, and offset/span compensation in software.

All the apnotes I've seen from sensor manufacturers only show hardware
solutions to temp compensation, usually limited to about 1% FS
accuracy or less due to hardware constraints.

I want to to temp compensation by measuring the bridge resistance to
get the temperature, and use this to compensate the pressure reading,
ideally to 0.1% of full scale over a temp range of 10-30 deg.C

Is there any chance that sensors will have a fixed (from sensor to
sensor) relationship between the TC of the bridge resistance, and the
TC of offset & span, so we don't have to calibrate over temperature ?
Would be nice but I suspect the answer is no, especially if we want
0.1% accuracy!

Is the offset & span TC, and the TCR of overall bridge resistance
generally linear ? This would allow compenstion and linearisation by
an automatic cal jig that calibrated at only 2 temperatures, but
multiple pressures (for linearisation).

Any comments etc. welcome.  
-- Going offline? Don't AutoReply us!
email with SET PICList DIGEST in the body

More... (looser matching)
- Last day of these posts
- In 2001 , 2002 only
- Today
- New search...