German UNESA sensors, UNESA models, UNESA prices

UNESA 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 proximity 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 consist of 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 from 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 substance, such as ultrasonic waves or light pulses.

UNESA 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. The most common and high-precision non-contact laser speed sensor on the market is the ZLS-Px aberration speed sensor. The aberration speed sensor has two ports: one emitting port that emits LED light source, and one high-speed imaging 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 the sensor's internal algorithm calculates and 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 directs laser light at 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 an algorithm. 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 and linear motion speed measurement. However, industrial automation often requires irregular speed measurements, such as athlete speed measurement, traffic vehicle speed measurement, and golf ball speed measurement. Radar speed sensors can meet these requirements.

UNESA Sensor Principle

A transmissive speed sensor consists of a slotted or notched disk, a light source, and a phototube. When the disk rotates with the shaft under test, light can only reach the phototube through the holes or notches. When the phototube is illuminated, its reverse resistance is very low, thus outputting an electrical pulse signal. When the light source is blocked by the disk, the reverse resistance of the phototube is very high, and there is no signal output at the output terminal. In this way, based on the number of holes or notches on the disk, the rotational speed of the shaft under test can be measured. The number of holes or notches on the disk is usually set to sixty, therefore, 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 tape (adhesive tape), aluminum foil or other reflective materials can also be used as substitutes, and 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, the distance between them is 5-15M. When the measured shaft rotates, the photoelectric element receives pulsating 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 almost no interference signals generated. However, for the transmissive type, vibration reduces the service life of the light source, so it is 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.

UNESA 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 signal from the vehicle speed sensor will greatly affect these control units. Vehicle 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 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 periodic changes in the magnetic field passing through the Hall element. This causes the Hall element's output voltage to change, which is processed by subsequent circuits to form a stable pulse voltage signal as the output of the vehicle speed sensor. Key electrical technical parameters of Hall-structure speed sensors include: output signal high voltage, low voltage, duty cycle, period, rise time, fall time, and pulses per cycle. 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 test results are increasingly favored by vehicle 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 test accuracy, reliable data communication, a user-friendly graphical interface, strong anti-interference capability, simple and intuitive testing process, and low system development cost. It has good market potential, indicating significant application prospects for speed sensors in vehicle speed detection. 2) Speed sensors for belt conveyors use Hall sensors, which are sensors that utilize the Hall effect for 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 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 and automatic control, computer devices, and modern military technology.

Weidou Intelligent Technology specializes in selling German UNESA sensors, UNESA proximity sensors, UNESA distance sensors, UNESA vision sensors, UNESA displacement sensors, UNESA load cells, UNESA speed sensors, UNESA photoelectric sensors, UNESA position sensors, UNESA angle sensors, UNESA tactile sensors, UNESA temperature sensors, UNESA pressure sensors, UNESA flow sensors, UNESA level sensors, UNESA motion sensors, and UNESA process sensors. Original German imports. Welcome inquiries and orders from users.