Linear Encoders with Calibration
A linear encoder and linear encoding technology, applied in the field of linear encoders, can solve problems such as error value detection damage, failure to consider environmental impact or aging, etc.
Active Publication Date: 2017-11-21
HEXAGON TECH CENT GMBH
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Problems solved by technology
A further disadvantage is that, because of this method, at the zero position of the device, the uncalibrated range continues to exist and the distance of the sensor and the distance of the symbols on the mass embodied device must be adapted to each other
In addition, environmental influences or aging phenomena are not considered in EP 1195880A1
However, these can lead to a change in the distance of the sensors from one another, whereby the error value determination can be very disadvantageously corrupted
Method used
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[0064] Figure 1a A general schematic view of a linear encoder 100 according to the prior art is shown with a read head 1 which can be linearly directed along the direction of extension of the mass embodying device 3 (indicated by the double-headed arrow 2a). It moves on the track 2b opposite to the fixed mass embodiment 3, whereby the measurement of linear distances can be performed. In order to generate a relative movement along the axis, the readhead 1 can also be fixedly mounted and the mass embodied device 3 can be moved in relation to the moving object to be measured, eg by fastening it to the moving object to be measured. The mass incarnation device 3 has a position-coding mark 3 c which is partially detected by the sensor unit 4 of the read head 1 . By analyzing the signal of the sensor unit 4 generated according to this detection, the control and analysis unit 2 of the linear encoder 100 can determine the quality of the read head 1 based on the information stored in ...
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A linear encoder (100) with a calibration function, having a mass embodiment (3) of a position-coding mark (3c), a read head (1) with a calibration device, and a control and analysis unit (2), and a calibration method for calibrating a position code (3c) made of symbols (20) with said readhead (1). The read head (1) has a sensor unit (4) with at least two detection reference points (R1, R2) whose detection distance establishes at least one standard (s, s1, s2, s3 ). Within the scope of the calibration method, a calibration position value (K20b, K20c, K27b, K27c, K28b, K28c) for a symbol (20) is prepared by means of the standard (s, s1, s2, s3) in the form determined with high precision and stored in said control and analysis unit (2).
Description
technical field [0001] The invention relates to a linear encoder with calibration function according to the preamble of claim 1, a calibration method for such a linear encoder according to the preamble of claim 7, and such a computer program product . Background technique [0002] Linear encoders for precise distance measurement are required in many fields of application, where, for example, the position of parts that are movable along a linear path is to be determined, and the position of their components on a linear axis such as a drive or pivot axis. The position detected in this case can be used as a position value for measuring purposes or also for positioning the component via a drive with a position control loop. Such linear position encoders are therefore used in devices such as coordinate measuring machines (CMM), geodetic devices, robotic arms or hydraulic actuators. For this purpose, a linear encoder has a mass embodiment movable relative to one another and a re...
Claims
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IPC IPC(8): G01D5/00G01D5/24G01D5/30G01D3/036
CPCG01D5/2449G01D5/24438G01D5/34723G01D5/34746G01D18/001G01B11/14G01D5/14G01D18/00
Inventor U·沃金格海因茨·利普纳克努特·西尔克斯
Owner HEXAGON TECH CENT GMBH