The working principle of different loading cells

1.Piezoresistive load cell
Resistance strain gauge is one of the main components of piezoresistive load cell. The working principle of metal resistance strain gauge is the phenomenon that the strain resistance adsorbed on the base material changes with mechanical deformation, commonly known as resistance strain effect.
2.Ceramic load cell
Based on the piezoresistive effect, the ceramic load cell directly acts on the front surface of the ceramic diaphragm, causing slight deformation of the diaphragm. The thick film resistor is printed on the back of the ceramic diaphragm and connected into a Wheatstone bridge. Due to the piezoresistive effect of the varistor, the bridge generates a highly linear voltage signal proportional to the pressure and proportional to the excitation voltage, The standard signal is calibrated to 2.0/3.0/3.3mv/v according to different pressure ranges, which can be compatible with strain sensor.
3.Diffused silicon load cell
The working principle of the diffused silicon load cell is also based on the piezoresistive effect. Using the piezoresistive effect principle, the pressure of the measured medium acts directly on the diaphragm of the sensor (stainless steel or ceramic), causing the diaphragm to produce a micro displacement proportional to the medium pressure and change the resistance value of the sensor. This change is detected by electronic circuit, And convert and output a standard measurement signal corresponding to this pressure.
4.Sapphire load cell
Using the working principle of strain resistance and using silicon sapphire as semiconductor sensitive element, it has unparalleled metering characteristics. Therefore, the semiconductor sensor made of silicon sapphire is not sensitive to temperature change and has good working characteristics even at high temperature; Sapphire has strong radiation resistance; In addition, the silicon sapphire semiconductor sensor has no p-n drift.
5. Piezoelectric load cell
Piezoelectric effect is the main working principle of piezoelectric sensor. Piezoelectric sensor can not be used for static measurement, because the charge after external force is saved only when the circuit has infinite input impedance. This is not the case in practice, so the piezoelectric sensor can only measure dynamic stress.