Product category:
Pressure sensors
News Release from: SensorsOne | Subject: Transducers for dynamic pressure measurement
Edited by the Engineeringtalk Editorial
Team on 06 November 2006
Transducers for dynamic pressure
measurement
For the best frequency response from a pressure sensor use an unamplified piezoresistive transducer that provides a millivolt output directly from a strain gauge bridge.
The increased use of digital electronics to characterise, condition and amplify the output of a pressure transducer offers the user many benefits, but the tradeoff is that the natural frequency response of the sensor is masked by the damping, filtering and averaging of the transducer's output signal by the smart electronics Typically only a few resistor components are required to condition the millivolt output from a strain gauge pressure sensor in order to rationalise the signal without compromising the natural response of the pressure sensing diaphragm
This article was originally published on Engineeringtalk on 24 May 2006 at 8.00am (UK)
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The IMP-LR low range pressure transducer, which covers ranges from 25 to 1000mbar gauge or absolute can provide a millivolt output from a silicon strain gauge diaphragm.
Semiconductor strain gauges have very high gauge factors, which make it possible to use a small size silicon chip which in turns helps increase the natural frequency of the sensing diaphragm.
For ranges between 1 and 10bar gauge or absolute the IMP01 piezoresistive pressure sensor uses a ceramic thick film strain gauge diaphragm which has a high dynamic response due to the high rigidness of ceramic compared with other sensing materials.
The TPS high range pressure transducer can measure pressures from 10 up to 1000bar via 17-4ph stainless steel sensing diaphragm with bonded foil strain gauges which provide a high dynamic response particularly at higher ranges.
For very high pressure testing the TPH strain gauge pressure sensor can measure from 1000 up to 5000bar with a high integrity 15-5ph stainless steel sensing diaphragm and bonded foil strain gauges.
Due to the high pressure rating and thickness of materials used in this pressure transducers construction the TPH has a very high frequency response to dynamic changes in pressure.
In the case of dynamic response it is true to say that less is more when it comes to conditioning the output signal of a pressure sensor for optimum frequency response.
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