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Dynamic pressure measurement with mV output transducers
13th May 2007
For the best frequency response from a pressure sensor use an un-amplified piezo-resistive transducer that provides a mV output directly from a strain gauge bridge.
The increased use of digital electronics to characterise, condition and amplify the output of a pressure transducer offer the user many benefits, but the trade-off is that the natural frequency response of the sensor is masked by the damping, filtering and averaging of the transducers output signal by the smart electronics. Typically only a few resistor components is 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. The IMP-LR low range pressure transducer which covers ranges from 25 mb up to 1000 mb gauge can provide a milli volt 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 turn helps increase the natural frequency of the sensing diaphragm. For ranges between 1 and 10 bar gauge or absolute the IMP01 piezo-resistive pressure sensor uses a ceramic thick film strain gauge diaphragm which has a high dynamic response due to the high rigidness of ceramic compared to other sensing materials. The TPS high range pressure transducer can measure pressures from 10 up to 1000 bar 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 5000 bar with a high integrity 15-5 ph 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.
Related Products Strain gauge output pressure sensors High frequency response sensors and instruments Digital indicators for strain gauge inputs
Associated Topics What is the difference between a pressure transducer and a transmitter Benefits of mV output pressure transducers How does a strain gauge diaphragm work
Resources Glossary of terms for pressure transducers Create a pressure transducer specification
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