German 3DMT sensor 3DMT model 3DMT price

3DMT sensors measure the operating speed of the object under test and convert it into an output signal. Speed sensors include linear speed sensors and rotational speed sensors. With technological advancements, traditional measurement equipment can no longer meet current needs and is gradually being phased out, while laser speed sensors are widely used. They play a significant role in product manufacturing by enabling automated and intelligent measurement control through connection to computers. This represents the integration of modern measurement technology with computer technology.

3DMT 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. 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: a transmission port that emits a LED light source, and a high-speed imaging port that performs CCD area high-speed imaging comparison. By comparing images at two closely spaced time points, the distance moved by the object is determined, and the sensor's internal algorithms output 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 directs laser light at the object under test; the reflected light is received by the (2) camera reception port, which sends the signal to the signal processor to calculate 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 object has stopped but also determines its direction of motion. Mount the sensor on a stable bracket to ensure that excessive vibration does not occur during rotation, allowing accurate measurement of the angular position and rotational speed of the rotating object. 2) Radar speed measurement: Traditional speed measurement mostly focuses on rotational and linear motion speeds. However, industrial automation often involves irregular speed measurements, such as athlete speed, traffic vehicle speed, and golf ball speed. Radar speed sensors can meet these requirements.

3DMT sensor principle

The 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 only reach the phototube through the holes or slots. 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 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 taken as still, therefore, for each revolution of the shaft under test, the photoelectric converter can output 60 pulse signals. If the time base signal of the electronic counter is taken as 1s, the rotational speed of the shaft under test can be read directly. The principle of the reflective speed sensor is the same as that of the transmissive type; it converts changes in received light into changes in electrical signals via the phototube, but it obtains pulse signals through light reflection, usually by adhering reflective material to the measurement area of the shaft under test to form a reflective surface. Commonly used reflective materials are special speed-measuring reflective paper tapes (adhesive tapes), 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 under conditions with strong vibration. The reflective type has no mechanical connection with the measured shaft, making it convenient to use.

3DMT 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 have a significant impact on 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, featuring 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 a permanent magnet with a specific number of pole pairs (generally 4 or 8 pairs), a Hall element, a rotating mechanism, and input/output connectors. Its working principle is that when the rotating mechanism of the sensor rotates under external drive, it drives the permanent magnet to rotate, causing the magnetic field passing through the Hall element to change periodically, causes a change in the output voltage of the Hall element, which is processed by subsequent circuitry to form a stable pulse voltage signal, serving as the output signal of the vehicle speed sensor. The main electrical technical parameters of Hall-effect speed sensors include: high output voltage, low output voltage, duty cycle, period, rise time, fall time, number of pulses per period, etc., To ensure product performance and reliability, these parameters must be quantitatively tested before leaving the factory. Test systems featuring integration and intelligence, efficient automatic measurement, software computation, and graphical or tabular display of test results are increasingly favored by automotive speed sensor manufacturers. It is a comprehensive testing device developed for performance measurement of commonly used Hall-effect vehicle speed sensors. Considering cost factors, the high-speed counter port of a microprocessor is used for data acquisition from the vehicle speed sensor, and software control is employed to compute the acquired data and process it for graphical display. 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, having good potential for widespread market adoption, therefore, speed sensors will have significant application prospects in vehicle speed detection. 2) The speed sensor of the belt conveyor uses 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 been widely adopted, and various types of Hall elements have been continuously developed. China began to intensify 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, For example: standard type, high-sensitivity type, low temperature coefficient type, temperature and magnetic field 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.

Weidou Intelligent Technology specializes in selling German 3DMT sensors, 3DMT proximity sensors, 3DMT distance sensors, 3DMT vision sensors, 3DMT displacement sensors, 3DMT torque sensors, 3DMT speed sensors, 3DMT photoelectric sensors, 3DMT position sensors, 3DMT angle sensors, 3DMT tactile sensors, 3DMT temperature sensors, 3DMT pressure sensors, 3DMT flow sensors, 3DMT level sensors, 3DMT motion sensors, 3DMT process sensors. All products are original imports from Germany. Welcome inquiries and orders.