Dynamic and static characteristics of germanjet magnetostrictive displacement sensor
Release date: June 19, 2019
Germanjet magnetostrictive displacement sensor is also called linear sensor, which converts displacement into electricity. Displacement sensor is a kind of linear device which belongs to metal induction. In this conversion process, there are many physical quantities (such as pressure, flow rate, acceleration, etc.) that need to be transformed into displacement first and then into electric quantity. Therefore, germanjet displacement sensor is an important kind. In the production process, the displacement measurement is generally divided into two types: measuring physical size and mechanical displacement. Mechanical displacement includes linear displacement and angular displacement. According to the different transformation forms of measured variables, germanjet displacement sensors can be divided into analog type and digital type. The simulation formula can be divided into physical type (such as self generating type) and structural type. The most commonly used displacement sensors are analog structure, including potentiometer displacement sensor, inductive displacement sensor, synchro, capacitive displacement sensor, eddy current displacement sensor, Hall displacement sensor, etc. An important advantage of digital displacement sensor is that it is easy to send the signal into computer system directly. This kind of sensor develops rapidly and is widely used.
Static characteristics of germanjet magnetostrictive displacement sensor
The static characteristic of germanjet displacement sensor refers to the relationship between the output and the input of the static input signal. Since the input and output are independent of time, the relationship between them, that is, the static characteristics of the sensor can be described by an algebraic equation without time variables, or by using the input as the abscissa and the corresponding output as the ordinate. The main parameters characterizing the static characteristics of the sensor are linearity, sensitivity, hysteresis, repeatability, drift, etc.
1. Linearity: refers to the degree that the actual relationship curve between sensor output and input deviates from the fitting line. It is defined as the ratio of the maximum deviation between the actual characteristic curve and the fitting straight line and the full scale output value in the full range range.
2. Sensitivity: sensitivity is an important index of static characteristics of sensor. It is defined as the ratio of the increment of the output to the increment of the corresponding input. S is the sensitivity.
3. Hysteresis: the phenomenon that the input and output characteristic curves of the sensor do not coincide during the change of input from small to large (positive stroke) and input from large to small (reverse stroke) becomes hysteresis. For the same size of input signal, the output signal size of positive and negative stroke of sensor is not equal, this difference is called hysteresis difference.
4. Repeatability: repeatability refers to the degree to which the characteristic curves obtained by the sensor are inconsistent when the input quantity is continuously changed for many times in the same direction.
5. Drift: the drift of sensor refers to that the output of sensor changes with time under the condition of constant input, which is called drift. There are two reasons for the drift: one is the structural parameters of the sensor itself; the other is the surrounding environment (such as temperature, humidity, etc.).
6. Resolution: when the input of the sensor increases slowly from non-zero value, the output changes observably after exceeding a certain increment. This input increment is called the resolution of the sensor, that is, the minimum input increment.
7. Threshold: when the input of the sensor increases slowly from zero, the output changes observably after reaching a certain value, which is called the threshold voltage of germanjet sensor.
Dynamic characteristics of germanjet sensor
The so-called dynamic characteristic refers to the output characteristic of displacement sensor when the input changes. In practical work, the dynamic characteristics of the sensor are usually represented by its response to some standard input signals. The response of the former to the input signal can be easily estimated by using the standard response method. The most commonly used standard input signals are step signal and sinusoidal signal, so the dynamic characteristics of the sensor are usually represented by step response and frequency response.