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Gauge pressure measurement is a subtype of differential pressure measurement. The idea is to compare pressure at any point to the current atmospheric pressure. The Gauge pressure measurement is not consistent because the atmospheric pressure varies with altitude so it cannot be used in critical measurements. Still gauge pressure sensors are used in tire pressure and blood pressure measurements. [1.]
Where to use pressure sensors?
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- Marine Industry: Especially on submarines it is very precise how much oxygen the crew has; pressure sensors regulate the amount. [1.]
Distributors in Finland
Because pressure sensors are used in so many things, Finland has an endless amount of vendors from small retailers to large distributors.
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We chose as our Piezoelectric sensor a PiezoStar® Pressure Sensor Type 6125C. (3)
Transfer function:
Transfer function for piezoelectric transducer can be calculated as:
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There are different kind of sensors on the market with different amount of bars. New piezo materials (PiezoStar crystal) inprove the sensors performance. [3.]
Other Characteristics:
Operating temperature range -20...350 C
Measurin range 0...300 bar
Natural frequence >70 kHz [3.]
Conducting for piezoelectric transducers:
Piezoelectric sensor component includes a microchip which sends information and he data from piezoelectric sensors can be collected by using voltmeter. The voltage is equivalent to load voltage which loads the capacitance of charging full.
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The sensor is statically calibrated. [5;6]
Sources
- Preeti Jain, Pressure Sensors, http://www.engineersgarage.com/articles/pressure-sensors-types-working
- Robert E. Bicking, Fundamentals of Pressure Sensor Technology 1998, http://www.sensorsmag.com/sensors/pressure/fundamentals-pressure-sensor-technology-846
- PiezoStar® Pressure Sensor Datasheet by Kistler
- Piezoelectric Transducers and Applications, editor: Antonio Arnau Vives
- Eduardo Bartolome, Signal conditioning for piezoelectric sensors, http://www.ti.com/lit/an/slyt369/slyt369.pdf
- CONVENTIONAL CHARGE OUTPUT SENSORS, http://www.pcb.com/TechSupport/tech_signal
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