Germanjet magnetostrictive straight line Displacement sensor Is a commonly used sensor, with good stability, strong durability, easy maintenance, flexible use, high reliability and other advantages, is widely used in many industries. We're using germanjet Displacement sensor It is necessary to master the technical terms when it is used. Today, I'd like to introduce the professional terms of germanjet displacement sensor for you. I hope it can help you.
When the ferromagnetic material is changed in the magnetic field, the lattice spacing of the medium changes due to the orientation of the magnetic domains, which leads to the change of the length and volume. This phenomenon is called magnetostrictive effect.
For the magnetic ruler products, the blind area refers to the measuring rod area that does not respond to the input variation or has response but fails to meet the specified accuracy requirements, that is, the measuring rod part beyond the effective range.
When the relationship between input and output is a linear function, its characteristic curve is a straight line, which can be considered as a linear change, and its slope represents the sensitivity of the equipment. The input value of the magnetic ruler is the position value of the positioning magnet, and the output value is the corresponding electrical signal.
Nonlinearity, linearity (nonlinear error)
Nonlinearity: refers to the degree of non coincidence between the actual output characteristic curve and the theoretical characteristic curve.
Linearity (also known as nonlinear error): refers to the degree that the actual relationship curve between output and input deviates from its fitting line. Linearity = maximum deviation △ full scale output x 100%. The magnetic ruler uses the least square method to determine the fitting line, and the linearity level of the magnetic ruler can be maintained within the service life of the equipment.
It refers to the consistency between the measured indication value and the measured (agreed) true value. The accuracy of the sensor is a comprehensive index, which refers to the root mean square error of nonlinearity, repeatability and hysteresis.
Repeatability and repeatability error
Repeatability: under the same working conditions, from the same direction to the same position for multiple consecutive measurements of the degree of mutual consistency.
The error is repeated in the same direction. The repeatability error is affected by the lag and resolution of the equipment.
Resolution: refers to the minimum variation of the measured input quantity that can be detected by the magnetic ruler within the specified measurement range, that is, the resolution ability of the small change of the input quantity.
Resolution: the percentage of resolution relative to full scale input.
The sensitivity of the device is equal to the ratio of the output increment to the corresponding input increment.
Update time and sampling frequency
Update time (sampling frequency): refers to magnetostrictive displacement sensor The internal cycle frequency of data refresh and sampling is equal to the number of times to detect input per second. For some devices that use magnetic ruler to measure fast moving parts, it is necessary to have a high sampling frequency to ensure the real-time detection data.
Hysteresis refers to the degree of non coincidence between output and input characteristic curve in positive (input increase) and reverse (input decrease) stroke. with magnetostrictive displacement sensor For example, suppose that the magnetic ring moves to the same position in the positive and negative directions respectively, but the electrical signals output twice are not consistent, and the difference between the inconsistent outputs is the lag.
It refers to the resolution setting parameters of sensor matching with upper computer, control system, secondary instrument and other equipment. If magnetostrictive displacement sensor If the system resolution is inconsistent with the set value of the device, the data display will be abnormal and the equipment will not work normally.
Refers to the ending input position within the effective range of the sensor.
It refers to the algebraic difference between the upper and lower limits of the measurement range. The effective range of displacement sensor must be shorter than the total length of the equipment.
It refers to the initial input position within the effective range of displacement sensor. Zehnder sensor can be effectively set in any range.