What Is A Vibration Temperature Sensor?

What is a Vibration Temperature Sensor? Let's find out.

A vibration temperature sensor is one of the key components in test technology. Its main function is to receive mechanical quantities and convert them into proportional electrical quantities. A vibration temperature sensor is also an electromechanical conversion device.

Vibration temperature sensors do not directly convert the original mechanical measurement into electrical energy, but rather the original mechanical measurement is used as an input to the vibration temperature sensor, and then the machine receives this portion to form another mechanical measurement suitable for conversion, and converts the mechanical measurement into electrical energy by means of an electrical conversion section. Therefore, the operational performance of the vibration temperature sensor depends on the operational performance of the mechanical receiving part and the electrical conversion part.

1. Relative Mechanical Reception Principle

Since mechanical motion is a simple form of physical motion, the first thing that came to mind was the measurement of mechanical vibration, and mechanical vibration instruments were built (e.g., Geiger vibrometers, etc.). . This is the basis of the principle of mechanical sensor reception. Its working principle is: when the vibration direction of the measured rod is the same as the vibration direction of the measured object, the instrument is fixed on a fixed bracket, and contacted with the surface of the measured object through the elasticity of the spring. When the vibrating body vibrates, the contact rod moves with the push of the recording pen, and the displacement curve of the vibrating body with time is drawn on the moving paper tape. Based on the logging curve, parameters such as displacement and frequency can be calculated.

The relative measurement of a mechanical receiver element is the relative vibration of the object to be measured with respect to a reference object. The absolute vibration of the object to be measured can only be measured if the reference is perfectly fixed. This is not useful when absolute vibration measurements are required and a fixed reference point cannot be found. For example, when testing the vibration of an internal combustion locomotive, or measuring the vibration of the ground and buildings during an earthquake, there is no fixed reference point. In such cases, another type of vibration measurement instrument, the inertial vibrometer, is used.

2. Inertial mechanical reception principle

When measuring mechanical vibration, the inertial vibrometer is fixed directly to the vibration measurement point of the object to be measured. When the sensor shell moves with the vibration measurement body, the inertia block supported by the elasticity moves relative to the shell, and the recording pen mounted on the inertia block can record the relative displacement between the mass element and the shell and the amplitude of vibration.

3. Electromechanical conversion principle of vibration temperature sensors

Generally speaking, according to the principle of mechanical reception, there are only two types of vibration temperature sensors: relative and inertial. However, in terms of electromechanical conversion, they have a wide range of types and applications due to the different conversion methods and properties.

The sensors used in modern vibration measurements are no longer stand-alone mechanical measuring devices in the traditional sense, but are part of a telemetry system that is closely linked to remote electronic circuits. Due to the different principles of electrical conversion and output power in vibration temperature sensors, some mechanical quantities change the electromotive force, and some charges change the electrical parameters of mechanical vibration, such as resistance and inductance.

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