Introduction To Vibration Temperature Sensors

Introduction to Vibration Temperature Sensors

1. Vibration temperature sensors are usually composed of three parts: the sensitive element, the conversion element and the basic conversion circuit. The sensitive element is the element that directly senses the measured physical quantity and outputs another physical quantity. The conversion element is the element that converts the non-electrical quantity from the sensitive element into an electrical signal such as a circuit parameter, current or voltage. Basic conversion circuits convert electrical signals into electrical energy that can be easily transmitted and processed.

2. When some crystals are deformed in a certain direction by an external force, charges of opposite polarity are generated on the corresponding two opposite faces. When the external force is removed, it will return to the state of no electricity, this physical phenomenon is called the positive piezoelectric effect. The charge generated by the crystal force is proportional to the external force, and the polarity of the charge depends on the form of deformation.

3. When the ends of two different metallic conductors are closely joined together to form a closed circuit, the circuit generates a thermoelectric potential and passes an electric current due to the different temperatures at the two contact points. This conversion of heat energy into electrical energy is known as the thermoelectric effect.

4. Active vibration temperature sensors do not use inductive coils, so they have obvious advantages in terms of size, weight, price and linearity. So it is easy to integrate; operational amplifiers with high input impedance and low output impedance can provide good isolation performance and the required gain; low-frequency cutoff frequency can reach a very low range.

5. Vibration temperature sensors input a known standard non-power, measure the output, give the calibration curve, calibration square height and calibration constants, and calculate the static metrics of the sensor, such as sensitivity, linearity, hysteresis and repeatability. Dynamic characteristics: determine the frequency response range of the sensor by determining its linear operating range: frequency response function, amplitude-frequency characteristics, phase-frequency characteristic curve and step response curve, amplitude error and phase error, time constant, damping ratio and intrinsic frequency.

6. Vibration temperature sensor inverse piezoelectric effect: when the polarization direction of some crystals applied to the external electric field, the crystal itself will produce mechanical deformation, when the external electric field is removed, the deformation disappears. This physical phenomenon is known as the inverse piezoelectric effect.

7. The internal impedance of the vibration temperature sensor itself is very high and the input energy is very weak, so when it is used, it must be connected to a preamplifier with high input impedance.

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