German MOBREY sensors, MOBREY models, MOBREY prices

MOBREY sensors are the direct source of information for the entire machine vision system. They mainly consist of one or two image sensors, sometimes accompanied by light projectors and other auxiliary equipment. The main function of a vision sensor is to acquire the rawest images that the machine vision system needs to process. Image sensors can use laser scanners, line-scan and area-scan CCD cameras, or TV cameras, as well as newly emerging digital cameras.

MOBREY sensor classification

1) Laser speed measurement: With the rise of modern precision manufacturing and the need to save costs, non-contact speed sensors will gradually replace contact speed sensors. Currently, the most accurate and commonly used non-contact laser speed sensors on the market are ZLS-Px aberration speed sensors. An aberration speed sensor has two ports: a transmission port that emits a LED light source, and a high-speed imaging port that enables high-speed imaging comparison over a CCD area. By comparing images taken at two instants within an extremely short time, the distance moved by the measured object is determined. 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. The (1) LED light emission port directs a laser beam at the target object; after reflection, the signal reaches 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 not only whether the measured object has stopped but also its direction of motion. Mount the sensor on a stable bracket to ensure that the rotating object does not generate excessive vibration during rotation, thereby allowing measurement of the rotation angle and rotational speed of the rotating object. 2) Radar speed measurement: Traditional speed measurements mostly involve rotary motion speed and linear motion speed. 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.

MOBREY sensor principle

A transmissive speed sensor consists of a slotted or apertured disk, a light source, and a phototube. When the disk rotates with the shaft under test, light can reach the phototube only through the holes or slots. When the phototube is illuminated, its reverse resistance is very low, and it outputs 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 at the output terminal. Thus, based on the number of holes or slots on the disk, the rotational speed of the shaft under test can be measured. The number of holes or slots on the disk is usually set to so that for each revolution of the shaft under test, the photoelectric converter outputs 60 pulse signals. If the time base signal of the electronic counter is set to 1s, the rotational speed of the shaft under test can be read directly. The principle of a reflective speed sensor is the same as that of a transmissive one; it converts changes in received light into changes in electrical signals via a phototube, but it obtains pulse signals through light reflection, typically by adhering reflective material to the measurement area of the shaft under test to form a reflective surface. Commonly used reflective materials are specialized speed-measuring reflective paper tapes (adhesive tapes); aluminum foil or other reflective materials may also be used as substitutes; sometimes white paint can be applied to the measurement area to serve as a reflective surface. The emitter and the reflective surface must be properly configured, typically with a distance of 5-15M between them. When the measured shaft rotates, the photoelectric element receives pulsed light, and outputs the corresponding electrical signal to the electronic counter, thereby measuring the rotational speed of the measured shaft. The waveform of the output signal from the photoelectric speed sensor is relatively regular, close to a standard square wave, with virtually no interference signals generated. However, for transmissive types, vibration can reduce the lifespan of the light source, so they are not suitable for use in conditions with strong vibration. The reflective type has no mechanical connection with the measured shaft, making it convenient to use.

MOBREY 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 sensors will greatly affect 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, featuring high sensitivity to magnetic fields, 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 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. The magnetic field passing through the Hall element changes periodically, causing the output voltage of the Hall element to change. Subsequent circuit processing forms stable pulse voltage signals, which serve 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 period. To ensure product performance reliability, these parameters must be quantitatively tested 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 testing device has been 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 used to calculate and graphically display the collected data. The completed testing device offers advantages such as high testing accuracy, reliable data communication, a user-friendly graphical interface, strong anti-interference capability, simple and intuitive testing processes, and low system development costs. 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 utilize the Hall effect to achieve magneto-electric conversion. The Hall effect was discovered in 1879 and has a development history of over 100 years. However, its application gained attention and widespread use 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 decades of research and development, it is now possible to produce Hall elements with various performances, such as standard type, high sensitivity, low temperature coefficient, temperature/magnetic field measurement, and switching types. Due to the characteristics of Hall sensors—high sensitivity, good linearity, high stability, small size, and high temperature resistance—they are widely used in various industrial fields, including non-electrical quantity measurement, automatic control, computer devices, and modern military technology.

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