The eddy current measurement principle is a non-contact measurement principle. This type of sensor is particularly suitable for measuring rapid displacement changes without the need to apply external forces on the measured object. Non-contact measurement is not significant for the case where the surface to be measured is not allowed to contact, or if the application requires long life of the sensor. A typical application of eddy current sensors is a fully automatic welding tester. Tester for weld quality control. The reason why the eddy current sensor is selected here is that only the eddy current sensor can withstand the powerful electromagnetic field brought by the welding robot. The measurement also meets the micron-level accuracy and 4mm range. The manufacturing standard of the European standard plug (two rounds) is carried out according to the CE standard. European standard plugs are used in most European countries such as Germany, Austria, Holland, Sweden, Norway, Finland, and Russia. Since this standard is widely used throughout Europe, we call it the "Continental European" standard. The plug is two cylinders with a span of 19mm. The grounding level is completed by grounding the plugs on both sides. Central and Eastern Europe 7/7 European plugs have embedded pins, similar to French and Belgian sockets. The electrical parameter of the European standard socket is 10A-16A 230ACV AC power supply. The European standard socket is the safe socket in the world. The special grounding is mainly for the safety of people. Therefore, it is also the most widely used plug standard in the world. Note: The Italian standard plug has three cylinders and one wire, and the Danish and Swiss standard plugs have three cylinders into a triangle shape, and both have direct grounding pins. Uk Plug Adapter,Europe Plug Type,Europe Electric Plug,Plug Converter Eu To Uk Guangdong Kaihua Electric Appliance Co., Ltd. , https://www.kaihuacable.com
Strictly speaking, the eddy current measurement principle should belong to an inductive measurement principle. The eddy current effect results from the energy of the oscillating circuit. The eddy currents need to be formed in electrically conductive materials. Providing an alternating current to the sensor probe inner coil creates a magnetic field around the sensor coil. If a conductor is placed in this magnetic field, an eddy current will be excited in the conductor according to Faraday's law of electromagnetic induction. According to Watts law, the direction of the magnetic field of the eddy current is exactly opposite to the magnetic field of the coil, and this will change the impedance value of the coil in the probe. This change in impedance is directly related to the distance between the coil and the measured object. After the sensor probe is connected to the controller, the controller can obtain the variation of the voltage value from the sensor probe, and based on this, calculate the corresponding distance value. The eddy current measurement principle can be applied to all conductive materials. Since the eddy current can penetrate the insulator, even if the surface is covered with a metallic material of the insulator, it can be used as a measured object of the eddy current sensor. The unique coil winding design allows the sensor to be extremely compact and at the same time meets its requirements for operating in a high temperature measurement environment.
All German meter eddy current sensors can withstand dust, moisture, oil and pressure measurement environments. However, there are some restrictions on the use of eddy current sensors. For example, for different applications, the corresponding linearity calibration is needed. Moreover, the output signal of the sensor probe is also affected by the electrical and mechanical properties of the measured object. However, it is these limitations in the use of the German turbulent eddy current sensors that achieve nano-scale resolution. At present, the German metric eddy current sensor can meet the measuring range of 100μm to 100mm. Depending on the range, the installation space can also reach the range of 2mm to 140mm.
Mechanical engineering that leaves the displacement sensor is almost impossible to imagine. These displacement sensors are used to control different motions, monitor fluid levels, check product quality, and many other applications. Here we talk about the different situations that the sensors are likely to face and the harsh environment of use, as well as how customer service is a disadvantage. Sensors are often used in very harsh environments such as oil, hot steam or violently fluctuating temperatures. Some sensors also need to be used on vibration components, in strong electromagnetic fields or need to be away from the measured object at a certain distance. For some important applications, accuracy, temperature stability, resolution and cut-off frequency are also required. For these limitations, different measurement principles have their own advantages and disadvantages. This also means that there is no unified method for optimizing the measurement principle.
Eddy current sensors can be subdivided into two types, shielded and unshielded. Using a muting sensor, a narrower electromagnetic field distribution can be produced, and the sensor is not affected by the proximity of radioactive metals. For unshielded sensors, the magnet wire is emitted from the side of the sensor. The range will tend to be larger. The correct installation is critical to signal quality. Other nearby objects also affect the signal.
With more than 40 years of experience, German rice bran continues to innovate and improve the performance of displacement sensors. In the fields of R&D, testing, quality control and equipment monitoring, we have made continuous progress.
The eddyNCDT product family can achieve a maximum cut-off frequency of 25 kHz while meeting nano-scale resolution. 