PART 1 What is an encoder?
Encoders can be used as optical or mechanical sensors for rotational angles. Therefore, they are units of measurement that can operate with or without contact points. For example, optical encoders operate purely in a visual manner.
In most cases, the sensor provides a digital output signal. These output signals are decoded at the end of the sensor line on the evaluation device.
In principle, fiber optic rotary position sensors are angle measuring devices used to measure the position of an axis. They are based on a purely optical passive sensor and a controller. Additionally, mechanical rotary position sensors can be used to measure length, position, rotational speed, and acceleration.
PART 2 Fiber Optic Absolute and Fiber Optic Incremental Encoders <br>The differences between incremental and absolute rotary position sensors are mainly related to their operation.
Incremental rotary position sensors generate a pulse for each movement step. They achieve this by counting stripes and dividing the time into cycles on a rotating disk. However, they can only detect changes. Incremental rotary position sensors cannot store the current position and require a controller. To obtain the current position, the device needs to be moved to an initial or reference position. Compared to absolute rotary position sensors, incremental devices are more cost-effective and have a simpler structure. This is generally true despite the need for additional counters, hardware, and software.
Compared to incremental rotary position sensors, absolute encoders always know their current position. This is especially important and advantageous for machine tools and CNC machining centers. For example, if the equipment is still running during a power outage, operation can be easily resumed. This can save significant money and time, especially on associated conveyor lines.
Furthermore, servo motors also require absolute motion. Absolute rotary position sensors are equipped with an encoder disk whose number of tracks depends on the resolution. For example, when the angular resolution is 13 bits, 13 tracks are detected and evaluated simultaneously. Higher resolutions can be achieved through interpolation techniques.
Furthermore, absolute rotary position sensors can be further divided into single-turn absolute sensors and multi-turn absolute sensors. A single-turn absolute sensor can only capture one complete rotation cycle of the shaft. The output code repeats with each new rotation cycle. However, if multiple rotation cycles exist within the capture range, a multi-turn absolute sensor is required.
Fiber Optic Encoders from Hongke Mcironor
MICRONOR offers a variety of fiber optic encoders. These models include the HK-MR330 and HK-MR430. The fiber optic encoders are equipped with different types of connecting optical fibers: glass fiber and POF fiber. The HK-MR330 is suitable for applications where the distance between the encoder and controller is relatively long; while the HK-MR430, due to its compact size, is particularly suitable for systems with limited space.
In addition, MICRONOR offers a wide variety of incremental encoders. Almost every model can be customized to individual needs. The product portfolio includes metal-free models as well as very robust models. Furthermore, some high-resolution incremental encoders are also available.
In conclusion, there are some relevant differences between incremental and absolute encoders, which are important for their respective workflows and requirements. We hope we have provided some clarity.
However, if you still need help and are looking for more information about various encoders, we'd be happy to support you. We're always ready to offer personalized advice and leverage our expertise and experience to assist you.
