element, such as a Field Effect transistor, to sense pressure. ■ Strain gauge sensors: the resistance caused by a change in length due to an external force is measured and converted it into an electrical signal. ■ Thin-film sensors: as the name implies, these sensors utilize a thin film containing resistive elements that alter resistance due to length and thickness changes induced by pressure. ■ Vacuum sensors: designed to measure pressures that are below atmospheric levels. Typically, they utilize piezoelectric technology or measure the volume of gas in a particular space. ■ Vented sensors: measure pressure relative to ambient barometric pressure.
distance between the sensor and any receiving device should also be taken into account. By considering all these parameters, an appropriate pressure sensor can be selected for a specific application that meets the necessary operating conditions and performance requirements. Conclusion As an electrical engineer, it is important to understand that measuring pressure and utilizing that data for process control and monitoring is crucial in many industries, such as manufacturing and healthcare. Accurate and reliable pressure sensing is necessary to ensure product and service quality and safety. With advancements in technology, pressure sensors are now available in various types, technologies, sizes, outputs, and accuracies. Choosing the right pressure sensor for a specific application requires careful consideration of operating parameters, such as sensor type, pressure range, temperature range, maximum pressure, output type, accuracy, resolution, supply voltage, and environmental factors. Fortunately, CUI Devices offers a line of piezo-based pressure sensors that can meet these requirements. Their sensors are available in multiple pressure types and operating ranges, allowing for flexible and accurate measurements.
Final design considerations
With the previous pressure sensor technologies, measurements, and types in mind, here are some final selection criteria to keep in mind when specifying a pressure sensor for a particular design. The first key parameter is the operating pressure range, which identifies the safe pressure range in which the device will perform as specified by the manufacturer. Operating temperature range, the maximum pressure that the sensor can tolerate before failure, and output type (analog/digital) are also important considerations. Output level, accuracy and drift, resolution, supply voltage, and environmental factors such as temperature, humidity, pressure, exposure to fluids, radiation, and physical
Figure 2: Example of a pressure sensor utilizing a piezoelectric diaphragm. (Image source: CUI Devices)
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