High precision angle and rotary motion measurement!
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Absolute EncodersIn an optical absolute shaft encoder each angular position is assigned a coded position value. The absolute position value is available immediately after turning on the system. This dispenses with the necessity for a reference drive at the system start.
The electrical signal of the absolute encoder is directly related to the angle of the shaft. The mechanical angular position is sensed by non contact optical elements, causing no wear. The output of an infrared diode is transmitted through a transparent code disc and a diaphragm. The light/dark pattern is converted to an electrical signal by an array of photo diodes. The same code occurs only once per revolution. This encoder is defined as a "single-turn" encoder.
Advantages of an Absolute Encoder:
a unique signal for each angular position
no need for initialization (zero reference)
immediately after power up or after an interruption of power the position is maintained
no need for a counter to process the signal
Unlike incremental encoders, the absolute encoder produces a signal in relation to an absolutely defined fixed point. Each angle corresponds to a specific bit combination, so the position of the monitored object can be read on power up or after a power failure.
Whenever mechanical rotary motions have to be monitored, the encoder is the most important interface between the mechanics and the control unit.
Encoders transform rotary movement into a sequence of electrical pulses. A number of bright/dark segments on a disc are photoelectrically scanned. The number of segments determine the resolution of the movement and hence the accuracy of the position. Because only increments of rotation are detected with a single channel, an additional signal, phase shifted by 90 degrees, is generated by inserting a grid diaphragm. This 90 degrees out of phase signal enables, together with the initial signal, the direction of rotation to be determined. Once per revolution a reference signal may also be generated.
Precise angle measurement
RPM or direction of rotation measurement
X/Y positioning tables
Positioning in handlings-systems