German EVU MESSTECHNIK sensors, EVU MESSTECHNIK models, EVU MESSTECHNIK prices

EVU MESSTECHNIK sensors, also known as displacement sensors, are a type of sensor used to detect the distance to an object to perform a preset function, and have achieved widespread adoption. Main products include mobile phone distance sensors and long-distance measurement sensors, applied in smart belts. Distance sensors can be classified into optical distance sensors, infrared distance sensors, ultrasonic distance sensors, and others based on their working principles. Most distance sensors used in mobile phones are infrared distance sensors, which feature an infrared emitting tube and an infrared receiving tube. When the infrared light emitted by the transmitting tube is received by the receiving tube, it indicates a short distance, requiring the screen to be turned off to prevent accidental operation. When the receiving tube does not receive the infrared light emitted by the transmitting tube, it indicates a long distance, and the screen does not need to be turned off. The working principles of other types of distance sensors are similar; they determine distance by emitting and receiving a certain substance, such as ultrasonic waves or light pulses.

EVU MESSTECHNIK sensor classification

1) Laser speed measurement: With the rise of precision manufacturing and the demand for cost savings, non-contact speed sensors are gradually replacing contact speed sensors. Currently, the most accurate and commonly used non-contact laser speed sensor on the market is the ZLS-Px aberration speed sensor. The aberration speed sensor has two ports: one emission port that emits LED light source, and one high-speed photography port that achieves CCD area high-speed imaging comparison. By comparing images at two points in time within an extremely short period, the distance moved by the measured object is determined, and combined with internal algorithms, the sensor outputs the object's speed in real time. As shown in the figure, (1) is the LED light emission port, (2) is the camera reception port, (3) and (4) are terminal blocks, and (5) are mounting screw holes. (1) The LED light emission port emits laser light toward the measured object, which reflects to the (2) camera reception port. Upon receiving the signal, it is transmitted to the signal processor, which calculates the speed using algorithms. The ZLS-Px aberration speed sensor can simultaneously measure speed and length in two directions. It can detect whether the measured object has stopped and determine its direction of motion. Mount the sensor on a stable bracket to ensure that the rotating object does not produce excessive vibration during rotation, allowing measurement of the rotation angle and speed of the rotating object. 2) Radar speed measurement: Traditional speed measurement mostly involves rotational motion speed and linear motion speed. However, there are many irregular speed measurements in industrial automation, such as athlete speed measurement, traffic vehicle speed measurement, and golf ball speed measurement. Radar speed sensors can meet these requirements.

EVU MESSTECHNIK sensor principle

A transmissive speed sensor consists of a disk with holes or notches, a light source, and a phototube. When the disk rotates with the measured shaft, light can only reach the phototube through the holes or notches. When the phototube is illuminated, its reverse resistance is very low, outputting an electrical pulse signal. When the light source is blocked by the disk, the phototube's reverse resistance is very high, and no signal is output. Thus, the rotational speed of the measured shaft can be determined based on the number of holes or notches on the disk. The usual number of disk holes or notches is unclear in the source, so the photoelectric converter outputs 60 pulse signals per revolution of the measured shaft. If the time base signal of the electronic counter is set to 1s, the rotational speed of the measured shaft can be read directly. The principle of a reflective speed sensor is similar to that of a transmissive sensor, converting changes in sensed light into electrical signal changes via a phototube, but it obtains pulse signals through light reflection. Typically, reflective material is adhered to the measurement area of the measured shaft to form a reflective surface. Common reflective materials include specialized speed-measuring reflective tape (adhesive tape), or aluminum foil and other reflective materials can be used. Sometimes, white paint can be applied to the measured area as a reflective surface. The projector and reflective surface must be properly configured, typically with a distance of 5-15M between them. When the measured shaft rotates, the photoelectric element receives pulsating light and outputs corresponding electrical signals to the electronic counter, thereby measuring the rotational speed of the shaft. The output signal waveform of photoelectric speed sensors is relatively regular, close to a standard square wave, with almost no interference signals. However, vibration in transmissive sensors can reduce the lifespan of the light source, making them unsuitable for conditions with strong vibration. Reflective sensors have no mechanical connection with the measured shaft and are convenient to use.

EVU MESSTECHNIK sensor industry applications

1) Modern vehicles are generally equipped with engine control, autonomous driving, ABS, TRC, automatic door locking, active suspension, guidance systems, electronic instruments, and other devices, All these devices require the vehicle speed signal. Therefore, The accuracy and stability of the output signal from the vehicle speed sensor will have a significant impact on these control units. Automotive speed sensors mostly adopt a Hall-effect structure, A Hall speed sensor is a magneto-electric sensor based on the Hall effect, Characterized by high sensitivity to magnetic fields, stable output signal, high frequency response, strong anti-electromagnetic interference capability, simple structure, and ease of use. It mainly consists of permanent magnets with a specific number of pole pairs (generally 4 or 8 pairs), Hall elements, a rotating mechanism, and input/output connectors. Its working principle is that when the sensor's rotating mechanism rotates under external drive, it drives the permanent magnet to rotate, causing the magnetic field passing through the Hall element to change periodically, which causes the output voltage of the Hall element to change, forming a stable pulse voltage signal through subsequent circuit processing, serving as the output signal of the vehicle speed sensor. The main electrical technical parameters of Hall-structure speed sensors include: high-level output voltage, low-level output voltage, duty cycle, period, rise time, fall time, number of pulses per cycle, etc. To ensure product performance reliability, these parameters must be quantitatively tested before leaving the factory. Test systems featuring integration and intelligence, efficient automatic measurement, software calculation, and graphical or tabular display of test results are increasingly favored by automotive speed sensor manufacturers. A comprehensive testing device developed for performance measurement of commonly used Hall-effect vehicle speed sensors. Considering cost, the high-speed counter port of a microprocessor is used for data acquisition from the vehicle speed sensor, and software control is used to calculate and graphically display the acquired data. The completed testing device offers advantages such as high testing accuracy, reliable data communication, a user-friendly graphical interface, strong anti-interference capability, a simple and intuitive testing process, and low system development cost. It has good market potential for widespread adoption, Therefore, speed sensors have significant application prospects in vehicle speed detection. 2) The speed sensor of the belt conveyor adopts a Hall sensor, which is primarily a sensor that utilizes the Hall effect to achieve magneto-electric conversion, The Hall effect has a development history of more than 100 years since its discovery in 1879, but its application began in the 50s of this century, Due to the rapid development of microelectronics, it has gained attention and widespread adoption, and various types of Hall elements have been continuously developed. China began to increase research on Hall elements in the 70s of the 20th century, After nearly several decades of research and development, it is now capable of producing Hall elements with various performance characteristics, such as: standard type, high sensitivity type, low temperature coefficient type, temperature and magnetic measurement type, and switching type Hall elements. Due to the characteristics of Hall sensors, such as high sensitivity, good linearity, high stability, small size, and high temperature resistance, they have been widely applied in various industrial fields, including non-electrical quantity measurement and automatic control, computer devices, and modern military technology.

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