1. Different working principles
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The piezoelectric effect is the main working principle of piezoelectric sensors, which cannot be used for static measurement because the charge after external force is only preserved when the loop has an infinite input impedance. This is not the case in practice, so it is determined that piezoelectric sensors can only measure dynamic stresses.
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Pressure gauge through the elastic deformation of the sensitive element (bourdon tube, diaphragm, bellows), and then by the conversion mechanism of the movement in the table to conduct the pressure deformation to the pointer, causing the pointer to rotate to display the pressure.
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2. Different applications
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Piezoelectric sensors are mainly used in the measurement of acceleration, pressure and force. Piezoelectric accelerometer is a commonly used accelerometer. It has the advantages of simple structure, small size, light weight and long service life. Piezoelectric acceleration sensors have been widely used in vibration and shock measurement of aircraft, automobiles, ships, Bridges and buildings, especially in the field of aviation and aerospace. Piezoelectric sensors can also be used to measure the internal combustion pressure and vacuum measurement of the engine. It can also be used in the military industry, for example to measure changes in chamber pressure and muzzle shock pressure at the moment a gun cartridge is fired in the chamber. It can be used to measure both large and small pressures.
pressure gauge (English name: pressure gauge) refers to the elastic element as a sensitive element, measuring and indicating higher than the environmental pressure of the instrument, the application is very common, it is almost all industrial processes and scientific research fields. It can be seen everywhere in the fields of heat pipe network, oil and gas transmission, water supply and gas supply system, vehicle maintenance factory and so on. Especially in the process of industrial process control and technical measurement, mechanical pressure gauges are more and more widely used because of the high mechanical strength and convenient production of the elastic sensitive elements of mechanical pressure gauges.
Pressure sensor is the most commonly used sensor in industrial practice, which is widely used in a variety of industrial automatic control environment, involving water conservancy and hydropower, railway traffic, intelligent buildings, production automation, aerospace, military, petrochemical, oil Wells, electric power, ships, machine tools, pipelines and many other industries, the following is a brief introduction to some commonly used sensor principles and applications. There are also medical pressure sensors.
The main technical parameters of pressure sensor include pressure measurement range, resolution, nonlinearity, sensitivity and so on
senstivity -6% 1mv\/psi indicates that if the sensitivity of the pressure sensor is 1psi, the voltage output of the pressure sensor will be 1mV, and the error is -6%. psi is the pressure unit, and 1psi is about 6895pa
range f.s for 5volts peak out 5000psi means that the maximum range is 5000psi, and the output is 5V, which is actually the sensitivity multiplied by the value of the range
I suggest you find a popular science article on pressure sensors to know