German Martens sensors, Martens models, Martens prices

Martens sensor: a sensor that measures the air flow drawn into the engine. In electronically controlled gasoline injection engines, to achieve the optimal mixture concentration under various operating conditions, it is essential to accurately measure the amount of air drawn into the engine at every instant, using this as the primary basis for the ECU to calculate (control) the fuel injection quantity. If the air flow sensor or its wiring fails, the ECU will not receive the correct intake air signal, preventing normal control of the fuel injection quantity. This will cause the mixture to be too rich or too lean, resulting in abnormal engine operation. Valve Martens 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 sensors currently on the market are ZLS-Px aberration speed sensors. An aberration speed sensor has two ports: one emission port that emits a LED light source, and one high-speed imaging port that enables CCD area high-speed imaging comparison. By comparing images taken at two instants within an extremely short time, the distance the measured object has moved is determined, and combined with the algorithm inside the sensor, the speed of the measured object is output 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 the terminal blocks, and (5) are the mounting screw holes. The (1) LED light emission port emits laser light toward the measured object; after reflection, it reaches the (2) camera reception port. Upon receiving the signal, it is transmitted to the signal processor, which calculates the speed via an algorithm. 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 rotation of the rotating object does not produce excessive vibration, thereby enabling measurement of the rotation angle and rotational speed of the rotating measured 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.

Martens 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 measured shaft, light can reach the phototube only through the holes or notches. 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 from the output terminal. Thus, based on the number of holes or notches on the disk, the rotational speed of the measured shaft can be determined. The usual number of disk holes or notches is unclear in the source, so each revolution of the measured shaft allows the photoelectric converter to output 60 pulse signals. 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 the same as that of a transmissive sensor: it converts changes in sensed light into changes in electrical signals via a phototube, but it obtains pulse signals through light reflection. Typically, a reflective surface is formed by adhering reflective material to the measurement area of the measured shaft. Commonly used reflective materials include special speed-measurement reflective paper tape (adhesive tape); aluminum foil or other reflective materials can also be used as substitutes. Sometimes, white paint can be applied to the measured area to serve as a reflective surface. The projector 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 illumination and outputs corresponding electrical signals to the electronic counter, thereby measuring the rotational speed of the measured shaft. The waveform of the output signal from a photoelectric speed sensor is relatively regular, close to a standard square wave, with almost no interference signals generated. However, in transmissive types, vibration can reduce the lifespan of the light source, so they are not suitable for use under conditions with strong vibration. Reflective types have no mechanical connection with the measured shaft and are convenient to use.

Martens 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 measurement sensor will greatly affect these control units. Automotive speed sensors often 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 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 is driven to rotate, 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 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 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 test results are increasingly favored by automotive speed sensor manufacturers. A comprehensive testing device has been 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 employed 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 promotion potential, so speed sensors will have significant application prospects in vehicle speed detection. 2) Speed sensors for belt conveyors adopt Hall sensors, which are sensors that utilize the Hall effect to achieve magneto-electric conversion. The Hall effect was discovered in 1879 and has a development history of more than 100 years. However, its application gained attention and widespread adoption only 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 general-purpose, high-sensitivity, low-temperature-coefficient, temperature-and-magnetic-field-measuring, 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, automatic control, computer devices, and modern military technology.

Weidou Intelligent Technology specializes in selling German Martens sensors, Martens proximity sensors, Martens distance sensors, Martens vision sensors, Martens displacement sensors, Martens torque sensors, Martens speed sensors, Martens photoelectric sensors, Martens position sensors, Martens angle sensors, Martens tactile sensors, Martens temperature sensors, Martens pressure sensors, Martens flow sensors, Martens level sensors, Martens motion sensors, and Martens process sensors. All products are original imports from Germany. Customers are welcome to inquire and place orders.