Sampling Rates for Tensiometer/Strain Gage
Sampling Rates for Tensiometer/Strain Gage
(OP)
I have to measure the tension in the armature of a very large hydraulic piston. The tension can be as high as 250,000 lb over 1/2 sec. Does anyone know if there is a strain/tension sensor that can accurately measure the profile over the 1/2 sec. I have heard it might be difficult to find a tension/strain sensor that can handle a sampling rate in the range of a 1000 Hz. Is anyone familiar with a company that can manufacture this type of sensor or know of a different method to use.





RE: Sampling Rates for Tensiometer/Strain Gage
Keith Cress
kcress - http://www.flaminsystems.com
RE: Sampling Rates for Tensiometer/Strain Gage
RE: Sampling Rates for Tensiometer/Strain Gage
RE: Sampling Rates for Tensiometer/Strain Gage
RE: Sampling Rates for Tensiometer/Strain Gage
It is the data acquisition system that is at issue. You need to move on to it. The 'sensor' is not the issue.
Any bridge strain gauge that has the range and accuracy you need will suffice. You need to research the system that you want to capture the result with.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Sampling Rates for Tensiometer/Strain Gage
Bear in mind that even properly designed strain gage based load cells have outputs in the 1-3mV/V range which will require a high quality instrumentation amp to get it up to the level most high speed A/Ds require.
Silicon gages have higher outputs, but have temperature stability problems. Might be good for a unique application.
Low speed high resolution A/Ds are the norm in the scale industry as rarely does the transducer have the speed to justify a SAR type A/D.
Bottom line, I doubt there is a simple solution to your problem. My company routinely makes high accuracy scales with capacities up to 500000 lb, but due to resonance issues, we don't bother making high speed measurements > 100 samples/s. If 50 samples over your 1/2 second interval is enough...
RE: Sampling Rates for Tensiometer/Strain Gage
Some reference sites: h
Ed Danzer
www.danzcoinc.com
www.dehyds.com
RE: Sampling Rates for Tensiometer/Strain Gage
RE: Sampling Rates for Tensiometer/Strain Gage
This may require reducing the diameter of the armature or drilling a hole in the center axis. Without a cross section picture of the cylinder it is difficult to explain.
Ed Danzer
www.danzcoinc.com
www.dehyds.com
RE: Sampling Rates for Tensiometer/Strain Gage
You want to measure the tension in an armature (I can't picture this).
Any resistive strain gauge will measure at well above 1000 Hz so I don't understand why anyone says that this is a problem. Your only problem is making sure that the sensor is placed in an area where there's enough strain. If the strain is too low then you'd have to introduce a load cell somewhere into the system.
I'd need to understand your application better but at face value it seems to be quite easy.
Another way of looking at it is that if the strain is so low that it's almost unmeasurable then you don't have to worry about fatigue etc in the structure being measured. If you are worried in the strain of another component connected to the piston then you need to strain gauge it.
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