The following is a list and comparison of encoders based on several different principles.

　　The following is a list and comparison of encoders based on several different principles:

　　1. Optical Encoder

　　ZERO WIDTH NON-JOINER (U+200C) — no visible content Principle :

　　Optical encoders operate based on the photoelectric effect. They consist of a light source (such as an LED), an encoder disk (a circular disc with alternating transparent and opaque segments or holes), and a photosensitive element (such as a photodiode). As the encoder disk rotates about its axis, light passing through the transparent sections is detected by the photosensitive element, generating an electrical signal. The output signal of the photosensitive element varies with the rotation of the encoder disk, thereby indicating the angular position or rotational angle.

　　ZERO WIDTH NON-JOINER (U+200C) — no visible content Features :

　　High precision, with resolution reaching an extremely high level.

　　It boasts excellent compatibility and is resistant to external magnetic field interference.

　　However, it is susceptible to contaminants, and the lifespan of light sources (such as LEDs) is limited.

　　2. Magnetic Encoder

　　ZERO WIDTH NON-JOINER (U+200C) — no visible content Principle :

　　A magnetic encoder measures position or rotational angle by detecting changes in the magnetic field. It consists of a magnetized code disk and one or more magnetic sensing elements, such as Hall-effect sensors or magnetoresistive sensors. As the code disk rotates, the magnetic sensing elements detect variations in the magnetic field and generate corresponding electrical signals.

　　ZERO WIDTH NON-JOINER (U+200C) — no visible content Features :

　　Durable, earthquake-resistant, and impact-resistant, suitable for harsh environmental applications.

　　It is insensitive to contaminants such as dust, dirt, and oil stains.

　　However, it is susceptible to electromagnetic interference, and its resolution and accuracy are relatively low.

　　3. Capacitive Encoder

　　ZERO WIDTH NON-JOINER (U+200C) — no visible content Principle :

　　Capacitive encoders detect the motion of an object by measuring changes in capacitance between electrodes. They typically consist of a rotor (the moving element) and one or more fixed transmitters and receivers. As the rotor, which bears a specific pattern such as sinusoidal grooves, rotates about its axis, it alters the capacitance between the rotor and the fixed transmitters and receivers, thereby generating a measurable electrical signal.

　　ZERO WIDTH NON-JOINER (U+200C) — no visible content Features :

　　Non-contact measurement, suitable for high-speed and high-precision applications.

　　It exhibits strong environmental adaptability and can, to a certain extent, withstand the effects of pollutants and temperature fluctuations.

　　However, it has a relatively complex structure and higher costs.