German Rechner Sensors sensors, Rechner Sensors models, Rechner Sensors prices

Rechner Sensors sensors are devices capable of detecting the approach of objects. They utilize the sensitivity of displacement sensors to nearby objects to identify proximity and output corresponding switching signals; therefore, proximity sensors are often referred to as proximity switches. This is a general term for sensors designed to replace contact-based detection methods such as switches, with the aim of non-contact detection of the target object. They can detect movement and presence information of the object and convert it into electrical signals.

Rechner Sensors sensor classification

1) Laser speed measurement: With the rise of precision manufacturing and the need 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 transmitting port that emits a LED light source, and one high-speed imaging port that achieves CCD area high-speed imaging comparison. By comparing images at two time points 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) LED light emission port, (2) camera reception port, (3), (4) terminal blocks, (5) 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 via algorithms. The ZLS-Px aberration speed sensor can simultaneously measure speed and length in two directions. It not only detects whether the measured object has stopped but also detects its direction of motion. Mount the sensor on a stable bracket to ensure that excessive vibration is not generated during the rotation of the object, thereby allowing measurement of the rotation angle and rotational speed of the rotating object. 2) Radar speed measurement: Traditional speed measurement mostly involves rotary motion speed measurement and linear motion speed measurement. However, there are many irregular speed measurement scenarios in industrial automation, such as athlete speed measurement, traffic vehicle speed measurement, and golf ball speed measurement. Radar speed sensors can meet these requirements.

Rechner Sensors sensor principle

Transmissive speed sensors consist of a slotted or notched disk, 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, resulting in the output of an electrical pulse signal. When the light source is blocked by the disk, the reverse resistance of the phototube 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 reflective speed sensors is similar to that of transmissive sensors, converting changes in sensed light into electrical signal changes via a phototube, but they obtain pulse signals through light reflection. Typically, reflective material is adhered to the measurement area of the measured shaft to form a reflective surface. Commonly used reflective materials include special speed-measuring reflective paper tape (adhesive tape); aluminum foil or other reflective materials can also be used, and sometimes white paint is 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 waveform of the output signal from photoelectric speed sensors is relatively regular, close to a standard square wave, with almost no interference signals generated. However, vibration in transmissive types can reduce the lifespan of the light source, making them unsuitable for conditions with strong vibration. Reflective types have no mechanical connection with the measured shaft and are convenient to use.

Rechner Sensors 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 of which require vehicle speed signals. Therefore, the accuracy and stability of the output signals from speed measurement sensors will greatly affect these control units. Automotive speed sensors mostly adopt a Hall-effect structure. A Hall speed sensor is a magnetoelectric sensor based on the Hall effect, characterized by high magnetic field sensitivity, stable output signals, 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 magnetic 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 is driven externally, it drives the permanent magnet to rotate, causing periodic changes in the magnetic field passing through the Hall element. This induces changes in the output voltage of the Hall element, which are processed by subsequent circuits to form stable pulse voltage signals as the output of the speed sensor. Key electrical technical parameters of Hall-structure speed sensors include: high output voltage, low output voltage, duty cycle, period, rise time, fall time, and pulses per cycle. To ensure product performance reliability, quantitative testing of these parameters must be conducted before factory shipment. Test systems featuring integration and intelligence, efficient automatic measurement, software calculation, and graphical or tabular display of results are increasingly favored by automotive speed sensor manufacturers. A comprehensive detection device developed for performance measurement of common 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 utilized to calculate and graphically display the acquired data. The completed detection device offers advantages such as high testing accuracy, reliable data communication, a user-friendly graphical interface, strong anti-interference capability, simple and intuitive detection process, and low system development cost. It has good market promotion potential, indicating significant application prospects for speed sensors in vehicle speed detection. 2) Speed sensors for belt conveyors adopt Hall sensors, which are sensors that utilize the Hall effect to achieve magnetoelectric conversion. The Hall effect was discovered in 1879 and has a development history of over 100 years. However, its application gained attention and widespread adoption in the 50s of this century due to the rapid development of microelectronics, leading to the continuous development of various Hall elements. China began increasing research on Hall elements in the 20s of the 70th century. After nearly several decades of research and development, it is now possible to produce Hall elements with various performances, such as standard type, high sensitivity type, low temperature coefficient type, temperature/magnetic measurement type, and switch type. Due to the characteristics of Hall sensors, including high sensitivity, good linearity, high stability, small size, and high temperature resistance, they are widely used in various industrial fields such as non-electrical quantity measurement, automatic control, computer devices, and modern military technology.

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