Absolute encoders！

Absolute encoder is a direct output of digital sensors, in its circular disc on the radial there are a number of concentric code channel, each channel by the translucent and opaque fan-shaped area, the adjacent code channel fan The number of the number of code on the code is the number of bits of its binary number, the side of the code is the light source, the other side corresponds to each channel has a photosensitive element; when the code in a different position , Each of the photosensitive elements according to the light or not converted to the corresponding level signal to form a binary number. This encoder is characterized by not a counter, in any position on the shaft can be read out a fixed position with the corresponding digital code. Obviously, the more the code channel, the higher the resolution, for an N-bit binary resolution encoder, the code disk must have N code. At present there are 16 domestic absolute encoder products.

Absolute encoders are optically converted using natural binary or cyclic binary (grayscale)encoder. Absolute encoder and incremental encoder is different from the disc on the light, opaque line graphics, absolute encoder can have a number of coding, according to read the code on the code, to detect the absolute position. Encoding design can be used binary code, cycle code, two's complement and so on. It is characterized by:
1.2.1 can be directly read the absolute value of the angle coordinates;
1.2.2 No cumulative error;
1.2.3 The location information is not lost after power is removed. But the resolution is determined by the binary number of bits, that is, the accuracy depends on the number of bits, there are 10, 14 and so on.

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