Introduction of Optical Glass encoder disk Code Wheel
Introduction of Optical Glass encoder disk Code Wheel
The glass optical code disc is made of optical glass, and there are many concentric code tracks engraved on it.
material : Optical glass
Encoding:Binary, decimal and cyclic codes
working principle
Concept
The photoelectric encoder disc converts the displacement into an electrical signal in the form of "digital code" through photoelectric conversion. It is a digital sensor with grating sensors, inductive synchronizers, magnetic grating sensors and capacitive grating sensors. However, the above-mentioned sensors are all output in the form of "counting"; while the encoder type sensor is output in the form of "digital". The core component of the photoelectric encoder is the encoder, and the accuracy of the encoder determines the accuracy of the sensor. The encoding disk code wheel is used for angle measurement (or angular displacement); the code ruler is used for length measurement (or linear displacement). The encoder disk and the code size are collectively referred to as the encoder. There are capacitive, inductive and optoelectronics in terms of the way to realize the conversion. The encoder is divided into two categories: incremental encoder and absolute encoder.
Application
The photoelectric code disc goniometer is a common instrument that uses the photoelectric encoding disk for accurate angle measurement. When the light source forms a narrow beam through a large-aperture aspherical condenser and irradiates it on the coded disc, the photoelectric device behind the slit and the output signal are determined by the angle of the code disc; 1” level), shaping, adding error correction and registering circuits if necessary, and then equivalent conversion, and finally decoding and display.
Advantages and disadvantages
The advantage of the photoelectric encoder is that there is no contact wear, so it allows high speed, high frequency response, stable and reliable, sturdy and durable, and high precision; its disadvantage is that the structure is more complicated and the price is more expensive. Photoelectric code discs have been widely used in CNC machine tools, servo motors, robots, rotary machinery, transmission machinery, instrumentation and office equipment, automatic control technology and detection and sensing technology, and the application fields are constantly expanding.
Working principle
When working, the light is projected on the optical code disc, and the code disk rotates with the moving object. The light passing through the bright area passes through the slit and is received by the photosensitive element. The arrangement of the photosensitive element corresponds to the code track one by one. The signal output by the photosensitive element, the former is "1", the latter is "0", when the code wheel rotates in different positions, the combination of the output signal of the photosensitive element reflects a certain regular digital quantity, representing the angle of the encoder disk axis displacement.
The working part of the optical encoder angular displacement measurement system is introduced.
The optical code disc is divided into three ways: binary, decimal and cyclic code according to its coding method:
Incremental and absolute encoders: According to the working principle, encoders can be divided into two categories: incremental and absolute. The incremental encoder converts the displacement into a periodic electrical signal, and then converts the electrical signal into a count pulse, and the number of pulses represents the magnitude of the displacement. Each position of the absolute encoder corresponds to a certain digital code, so its indication is only related to the starting and ending positions of the measurement, and has nothing to do with the intermediate process of the measurement.
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