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About Linear Encoders
Linear encoders sense and digitize linear position change for positional measurement and feedback to control systems. Travel, encoder resolution, encoder accuracy, and lines or counts per distance are the most important performance specifications to consider. Travel or measurement range is the full range of travel that can be encoded. Some linear encoders have selectable or configurable measurement ranges. Encoder resolution is the smallest degree of distance measurement that linear encoders can make. Typically, this specification is set to different values within the same linear encoder. Encoder accuracy is a performance specification that accounts for variables such as linearity, hysteresis and temperature. Lines or counts per distance determines the minimum linear position increment that can be distinguished. Either counts or lines may be specified, but they are not the same; for example, in quadrature systems, a line is associated with four counts or pulses.
There are two types of linear encoders and five types of encoder technologies. Absolute linear encoders provide a unique output signal for each mechanical position. They retain their position after power-down without requiring a home cycle. Incremental encoders provide output signals that repeat over the revolution. They do not retain their position after power-down since the outputs signals are not unique to any particular position. Choices for encoder technology are optical, magnetostrictive, magnetoresistive, and inductive. Optical encoders use a light emitter and receiver. Magnetostrictive encoders determine displacement or strain from the change in state of the magnetic field generated by a ferromagnetic material. Magnetoresistive linear encoders are made of nickel-iron thin-film on a silicon wafer and formed as a resistive strip. They are more sensitive than Hall effect sensors. Inductive encoders sense changes in a magnetic field and encode data into a position signal. Inductive technology is often suitable for harsh conditions or where contamination by dust is possible. Modular kit encoders, linear-to-rotary conversion, sealed encoders, and probe-style devices are also available.
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Engineering Web: Linear Encoders
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Optical linear encoders Position encoders Magnetic linear encoders Magnetic rotary encoders Optical linear encoders See Renishaw Profile & Catalog |
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RSF Electronics - OPEN LINEAR ENCODERS Enclosed Linear Encoders MSA 170, MSA 00x Open Linear Encoders MS 20 series MS 30 series See RSF Electronics, Inc. Information |
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BEI - Linear Quadrature Encoders 1-800-350-2727 - Innovative... LN Linear Quadrature Encoders return to Main Product Page See BEI Industrial Encoders (BEI IED) Profile & Catalog |
Part Numbers for Linear Encoders
| Part # | Distributor | Manufacturer | Product Category | Description |
|---|---|---|---|---|
| HEDS-9730#Q50 | Digi-Key | Avago Technologies US Inc. | Switches | ENCODER OPTICAL 180LPI LINEAR 5V |
| 640ES103A06NAAY | Powell Electronics, Inc. | HONEYWELL | Not Provided | Potentiometers, Encoders and Resolvers, Potentiometers, Linear and Rotary Potentiometric Sensors |
| 640CS103A06NAAY | Powell Electronics, Inc. | HONEYWELL | Not Provided | Potentiometers, Encoders and Resolvers, Potentiometers, Linear and Rotary Potentiometric Sensors |
| KHK53AXR00038 | PLC Radwell | SICK OPTIC ELECTRONIC | Not Provided | POMUX SSI LINEAR ENCODER |
| KHK53AXT00354 | PLC Radwell | SICK OPTIC ELECTRONIC | Not Provided | POMUX SSI LINEAR ENCODER |
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