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Cable displacement sensors！
Changchun Rongde Optics Co.,Ltd. Release time：2016/7/12 Browse：640Cable displacement sensors
The technology based on magnetic angle displacement sensor cable consists of 6 parts, to change the traditional cable displacement sensor contact, easy to wear, defects and poor high-frequency characteristics, the cable displacement sensor technology based on magnetic angle to the magnetic field media, will change into mechanical displacement angle of the magnetic field changes, on the one hand to solve the traditional cable-contact displacement sensor, on the other hand to reduce the wear and improve high-frequency characteristics of the system, ensuring that the displacement detection accuracy. Data processing operation, a magnetic angle for the received signal by a mathematical model for the operation of the displacement signal cable. Communication interface for communication via the communication interface device and application system, receiving commands from applications and devices to collect displacement signal back to the application. Thereby improving data acquisition accuracy, stability and reliability, reducing the threshold for application of the displacement sensor.
Cable displacement sensor function description
1) Pull the rope wrapped around the wheel hub and a magnet connected together, when the displacement of the cable, driven by rotation of the hub, turn the wheel causes the magnet and the hub of the shaft rotation, whereby the magnet field generating a angle change. When cable motion occurs automatically to ensure the return spring with a certain tension cable, make sure the ratio between the displacement and the magnetic pull of the angle.
(2) magnetic angle sensor and the magnet is mounted on the same central axis, is used to sense changes in the angle of the magnet, look for a microprocessor, the processor reads the magnetic angle information, and through the establishment of a mathematical model, the magnetic angle calculation for the cable displacement.
(3) communication interface, the microprocessor receives commands from the application system through the communication interface and the displacement information is returned to the application via the communication interface.
Cable displacement sensor communication interface
RS 485 bus with its simple structure, high communication speed, transmission distance, and many other advantages, the industrial control system has been widely used. It uses differential balanced send and receive mode for communication, the sender converts the serial port of TTL level signals into differential signals A, B two outputs after receiving transmission cable end to restore the differential signal into a TTL level signals . Since the transmission lines typically use twisted pair, and differential transmission, it is also a strong anti-interference ability common mode bus transceiver high sensitivity.
In the cable angle displacement sensor based on magnetic technology, we design all the way to the output signal RS 485, RS 485 interface chip MAX3485, and application systems for the data exchange of displacement. To ensure the reliability of data communication, the communication interface uses optical isolation chip 6N137.
Construction of the use of the position sensor MLX90316 need to use magnets in installation activities sensing the position of mechanical parts (usually connected at the end of the shaft). As long as a uniform horizontal magnetic flux magnet can be used. Magnet material and size does not matter; in the mechanical, magnetic and heat tolerance, the magnetic flux level must be 20 ~ 70 mT (for example, (45 ± 25) mT) within range.
On the air gap problem, if the actual gap distance between the IC surface is greater than 7.5 mm, the ring magnet is superior to the disc-shaped magnet. The magnet may be placed at the end of the shaft, the shaft can be rotated about the use of the ring magnet. You can also use special, special magnet design, obtain rotational position sensor normal transmission characteristics.
In the "technology-based FPGA dam displacement Intelligent Detection System", the technology will be based on magnetic angle sensor for cable displacement dam Rock Displacement acquisition device. Monitoring of the dam a total of seven, each dam has five key monitoring points, therefore, the use of RS 485 bus monitor these 35 dots star network. As can be seen from the test results, the sensor cable against wear traditional displacement sensor, poor resolution, low resistance, high-frequency characteristics of defects and poor, improve the measurement accuracy.
The technology based on magnetic angle displacement sensor cable consists of 6 parts, to change the traditional cable displacement sensor contact, easy to wear, defects and poor high-frequency characteristics, the cable displacement sensor technology based on magnetic angle to the magnetic field media, will change into mechanical displacement angle of the magnetic field changes, on the one hand to solve the traditional cable-contact displacement sensor, on the other hand to reduce the wear and improve high-frequency characteristics of the system, ensuring that the displacement detection accuracy. Data processing operation, a magnetic angle for the received signal by a mathematical model for the operation of the displacement signal cable. Communication interface for communication via the communication interface device and application system, receiving commands from applications and devices to collect displacement signal back to the application. Thereby improving data acquisition accuracy, stability and reliability, reducing the threshold for application of the displacement sensor.
Cable displacement sensor function description
1) Pull the rope wrapped around the wheel hub and a magnet connected together, when the displacement of the cable, driven by rotation of the hub, turn the wheel causes the magnet and the hub of the shaft rotation, whereby the magnet field generating a angle change. When cable motion occurs automatically to ensure the return spring with a certain tension cable, make sure the ratio between the displacement and the magnetic pull of the angle.
(2) magnetic angle sensor and the magnet is mounted on the same central axis, is used to sense changes in the angle of the magnet, look for a microprocessor, the processor reads the magnetic angle information, and through the establishment of a mathematical model, the magnetic angle calculation for the cable displacement.
(3) communication interface, the microprocessor receives commands from the application system through the communication interface and the displacement information is returned to the application via the communication interface.
Cable displacement sensor communication interface
RS 485 bus with its simple structure, high communication speed, transmission distance, and many other advantages, the industrial control system has been widely used. It uses differential balanced send and receive mode for communication, the sender converts the serial port of TTL level signals into differential signals A, B two outputs after receiving transmission cable end to restore the differential signal into a TTL level signals . Since the transmission lines typically use twisted pair, and differential transmission, it is also a strong anti-interference ability common mode bus transceiver high sensitivity.
In the cable angle displacement sensor based on magnetic technology, we design all the way to the output signal RS 485, RS 485 interface chip MAX3485, and application systems for the data exchange of displacement. To ensure the reliability of data communication, the communication interface uses optical isolation chip 6N137.
Construction of the use of the position sensor MLX90316 need to use magnets in installation activities sensing the position of mechanical parts (usually connected at the end of the shaft). As long as a uniform horizontal magnetic flux magnet can be used. Magnet material and size does not matter; in the mechanical, magnetic and heat tolerance, the magnetic flux level must be 20 ~ 70 mT (for example, (45 ± 25) mT) within range.
On the air gap problem, if the actual gap distance between the IC surface is greater than 7.5 mm, the ring magnet is superior to the disc-shaped magnet. The magnet may be placed at the end of the shaft, the shaft can be rotated about the use of the ring magnet. You can also use special, special magnet design, obtain rotational position sensor normal transmission characteristics.
In the "technology-based FPGA dam displacement Intelligent Detection System", the technology will be based on magnetic angle sensor for cable displacement dam Rock Displacement acquisition device. Monitoring of the dam a total of seven, each dam has five key monitoring points, therefore, the use of RS 485 bus monitor these 35 dots star network. As can be seen from the test results, the sensor cable against wear traditional displacement sensor, poor resolution, low resistance, high-frequency characteristics of defects and poor, improve the measurement accuracy.
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