Weidmuller electrical components Germany Weidmuller model Weidmuller price

Weidmuller electrical component is a sensor resistor whose resistance value changes with temperature. According to different temperature coefficients, it is divided into positive temperature coefficient thermistors and negative temperature coefficient thermistors. The resistance value of a positive temperature coefficient thermistor increases as the temperature rises, while the resistance value of a negative temperature coefficient thermistor decreases as the temperature rises; they both belong to semiconductor devices.

Weidmuller electrical component function

When the distance between the observer or system and the wave source changes, the frequency of the approaching wave will shift. This phenomenon is called the Doppler effect. Sonar and radar are made using the principle of this effect. The Doppler effect can be used to make ultrasonic proximity switches, microwave proximity switches, etc. When an object moves closer, the reflected signal received by the proximity switch will produce a Doppler frequency shift, thereby identifying whether an object is approaching. Proximity switches are widely used in aviation, aerospace technology, and industrial production. In daily life, they are applied in automatic doors in hotels, restaurants, and garages, as well as in automatic hot air blowers. In terms of security and anti-theft, important places such as archives, finance, banking, museums, and vaults are usually equipped with anti-theft devices composed of various proximity switches. In measurement technology, such as length and position measurement; in control technology, such as displacement, speed, and acceleration measurement and control, a large number of proximity switches are also used.

Weidmuller electrical component features

Most microphones are electret condenser microphones (ECM), a technology that has been around for decades. The working principle of ECM utilizes a polymer diaphragm with permanently isolated charge. Compared to the polymer diaphragm of ECM, MEMS microphones exhibit stable performance across different temperatures and are not affected by temperature, vibration, humidity, or time. Due to strong heat resistance, MEMS microphones can withstand high-temperature reflow soldering without any change in performance. Since the sensitivity change before and after assembly is minimal, this can even save on audio debugging costs during the manufacturing process. Currently, integrated circuit processes are increasingly being applied in the manufacturing of sensors and sensor interface integrated circuits. This micro-manufacturing process offers advantages such as precision, design flexibility, miniaturization, integration with signal processing circuits, low cost, and mass production. A fundamental resonant frequency in such a low frequency range would result in highly uneven frequency response within the audible frequency range for the microphone, which is unacceptable for microphone applications. When tensile stress exists within the sensitive membrane, its resonant frequency increases, but at the cost of sensitivity. Of course, higher fundamental resonant frequencies can be obtained by adjusting the size of the sensitive membrane, but this will still reduce sensitivity. Thus, piezoresistive schemes are not suitable for the manufacture of micro-microphones. A feasible solution is to adopt a capacitive scheme to manufacture micro-microphones. The advantage of this method is that all materials used in integrated circuit manufacturing processes can be used for sensor manufacturing. However, manufacturing micro-microphones using single-chip processes is quite difficult because the air medium between the two capacitor plates can only have a very small gap. Moreover, due to size limitations, bias voltage is difficult to satisfy in some application scenarios. Based on these issues, research on capacitive microphones has continued uninterrupted. Compared to traditional electret microphones, micro-electro-mechanical system (MEMS) microphones offer advantages such as small size, good heat resistance, good consistency, good stability, high reliability, and resistance to radio frequency interference. They can also output digital signals, facilitating intelligent development.

Weidmuller electrical component utility

Antennas radiate radio waves and also receive radio waves. However, what the transmitter sends to the antenna through the feed line is not radio waves, nor can the receiving antenna directly send radio waves to the receiver through the feed line; an energy conversion process must occur in between. Below, we analyze the signal transmission process using radio communication equipment as an example to illustrate the energy conversion role of antennas. At the transmitting end, the modulated high-frequency oscillating current (energy) generated by the transmitter is input to the transmitting antenna via feeding equipment (the feeding equipment can directly transmit current waves or electromagnetic waves depending on frequency and form). The transmitting antenna converts the high-frequency current or guided wave (energy) into radio waves—free electromagnetic waves (energy)—radiating them into the surrounding space. At the receiving end, radio waves (energy) are converted by the receiving antenna into high-frequency current or guided wave (energy), which is then transmitted to the receiver via feeding equipment. From the above process, it can be seen that the antenna is not only a device for radiating and receiving radio waves, but also an energy converter, serving as the interface device between the circuit and space.

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