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1 July 2012 HOT LINKS Trade Show Schedule ISO Certification Contact Single-Field Scanning - Reduced Sensitivity To Contamination, Higher Quality PRODUCT SPOTLIGHT The type of scanning in harsh operating environments in regard to contamination and fast, ultraposition measuring devices in linear metrology, is crucial for the quality of the output signals and therefore both for the positioning accuracy and for traversing speed. With the single-field scanning principle, HEIDENHAIN is meeting these requirements. Read more» Download the whitepaper NOW! NUMERIK JENA Offers Non-magnetic Encoders for High Magnetic Field Environments Known for its high quality, longlasting miniature scales and small profile scanning units, NUMERIK JENA now offers a line of encoders that are non-magnetic. These linear and rotary encoders have been tested in environments up to 6 Tesla and have no influence on the machine environment. They can also withstand this high magnetic environment without loss of Also in this issue: Did You Know... that two HEIDENHAIN controls are an integral part of an unusual deep-hole gun drill machine now in place at Dieffenbacher North America, a hydraulic press manufacturer? Read more» News NEW products introduced Highly Precise LIP 200 Series Exposed Linear Encoders PWM 20 Encoder Installation Tool LIC 4000 Absolute Linear Kit Encoder Read more» Technical Tidbit Ethernet vs USB Which interface is sturdier and more flexible for longer cable runs and a faster data transfer rate? Read more»
2 accuracy or resolution and are mechanically stable. Read more» HEIDENHAIN CORPORATION, 333 State Parkway, Schaumburg, IL Tel. +1 (847) Fax: +1 (847)
3 Literature Contact Sign up for HeidenhaINFO enews sign up Index Pages Automation enewsletter July Share Print Semiconductor and Metrology enewsletter Machine Tool enewsletter Application Question? Technical Information Linear Encoders with Single-Field Scanning HEIDENHAIN linear encoders are used as position measuring systems on machine tools, in handling and automation technology, and in measuring and inspecting equipment. Sealed linear encoders are protected from dust, chips and splash fluids and are ideal for operation on machines and systems with harsh operating environments in regard to contamination. Because of their compact design, they are also very effective in direct drives and assembly automation. Exposed linear encoders are used on fast, precise machines and systems, such as production and measuring equipment in the semiconductor industry, ultra-precision machines, measuring machines and precision devices in linear metrology, direct drives, etc. The most important requirements of these applications are: High positioning accuracy High traversing speed High machine availability Finely tuned velocity control Find out how HEIDENHAIN technology can be integrated into your highprecision motor, motion control and machining systems processes. C all us or complete the form to get access to other industry position feedback and finishing applications. *All fields required. *First Name: *Last Name: *C ompany: *Phone: * With the single-field scanning principle for linear encoders, HEIDENHAIN is fulfi lling these requirements. This method is characterized particularly by signifi cantly reduced sensitivity to contamination, and higher quality of the output signal. *Zip: Comments:
4 Photoelectric scanning Like most HEIDENHAIN encoders, the linear encoders operate according to the principle of photoelectrically scanning a regularly structured measuring standard. In the imaging scanning principle, as it is used for example in the LS sealed linear encoders, a structured scale moves relative to an opposed grating the index grating with an identical or similar structure. The incident light is modulated: if the gaps are aligned, light passes through. If the lines of one grating coincide with the gaps of the other, no light passes through. Photovoltaic cells convert these variations in light intensity into electrical signals. Please sign me up to receive your enewsletter with new information about HEIDENHAIN solutions. Enter Security C ode: Send Signal Generation with the Imaging Scanning Principle The type of scanning is crucial for the quality of the output signals and therefore both for the positioning accuracy and for traversing speed. Optical systems are sensitive by nature to contamination of all types. With the new single-field scanning principle, it has become possible to improve both qualities decisively. This illustration compares it with the previous 4-field scanning.
5 Signal generation with 4-field scanning The scanning reticle has scanning fields whose gratings are offset to one another by one fourth of a grating period each. The corresponding photovoltaic cells generate sinusoidal signals, phase-shifted to one another by 90 (elec.). These scanning signals are not at fi rst symmetrical about the zero line. For this reason the photovoltaic cells are connected in a pushpull circuit, producing two output signals I1 and I2 in symmetry with respect to the zero line and electrically phase-shifted by 90. Signal generation with single-field scanning The scanning reticle has one large-area grating whose grating period differs slightly from that of the scale. This generates an optical beat along the length of the scanning fi eld: at some positions the lines coincide and let the light through. At other locations the lines and gaps coincide, causing a shadow. In between, the gaps are only partially covered. This causes a type of optical filtering that allows homogeneous signals of a shape very close to a sine wave. Instead of individual photovoltaic cells, one large-area, specially structured photosensor generates the four
6 90 electrically phase-shifted scanning signals. Benefits of Single-Field Scanning Insensitive to contamination The large scanning area over the entire width of the scale grating and the arrangement of several scanning fields in succession make the encoders with singlefield scanning extremely insensitive to contamination. The results of corresponding contamination tests prove this: even when contamination over large areas is simulated, the encoder continues to provide highquality signals. The position error remains far below the value specifi ed for the accuracy grade of the encoder. In many cases, depending on the contamination, this can even prevent encoder failure where 4-field scanning cannot. This example shows the influence of contamination on the output signals. In the XY representation on an oscilloscope the signals form a Lissajous figure. Ideal output signals appear
7 as a concentric inner circle. Deviations in the circular form and position are caused by position error within one signal period (see Measuring Accuracy) and therefore go directly into the result of measurement. The size of the circle, which corresponds with the amplitude of the output signal, can vary within certain limits without influencing the measuring accuracy. In the encoder with single-field scanning, however, one sees only a small change in the amplitudes. In the XY display, only the diameter changes slightly a sure sign of very low position error. This type of contamination has very striking effects with 4-field scanning: Because two scanning fields are involved, the XY display shows an extremely eccentric ellipse. This causes a total failure of the encoder at this position. Better signal quality Encoders from HEIDENHAIN acquire their accuracy fi rst of all from the high quality of the line grating on the measuring standard. The sinusoidal output signals are interpolated in order to achieve applicationoriented measuring steps of 0.1 μm and finer. This results in additional position errors within one signal period because of asymmetric signals and deviations from the sinusoidal form. These position errors are random and can therefore not be compensated. The single-field scanning method has considerable influence here: The large scanning field and the special optical filtering generate scanning signals with high constancy and good sinusoidal form over the entire path of traverse. This substantially reduces position error within the signal period. This is very visible on the XY display of the oscilloscope: The output signals of the linear encoders with single-field scanning show a more circular form and less signal noise.
8 This is the prerequisite for Small position error within one signal period Good control quality for direct drives, which means improved, finely tuned velocity control High repeatability Even high, electrically permissible traversing speeds are made possible by the high-quality output signals of single-field scanning. Because the signal amplitudes are only slightly influenced by velocity, stable output signals ensure reliable interpolation even at increased traversing speeds. Print Share HEIDENHAIN 2012
9 Literature Contact Sign up for HeidenhaINFO enews sign up Index Pages Automation enewsletter July Share Print Semiconductor and Metrology enewsletter Machine Tool enewsletter Application Question? NUMERIK JENA Offers Non-magnetic Encoders for High Magnetic Field Environments Known for its high quality, long-lasting miniature scales and small profile scanning units, NUMERIK JENA now offers a line of encoders that are non-magnetic. These linear and rotary encoders have been tested in environments up to 6 Tesla and have no influence on the machine environment. They can also withstand this high magnetic environment without loss of accuracy or resolution and are mechanically stable. Non-magnetic encoders are commonly found in MRI machines, as well as semiconductor and microscopy fields. click to enlarge NUMERIK JENA's non-magnetic LIK linear series has a 20-micron graduation on glass and digital versions can output resolutions to 50 nanometers, where the digitizing electronics reside in the connector. With loose mounting tolerances of the scanning unit in relation to the 20 micron scale, and three configurations of mounting the scanning unit, the LIK series provides excellent motion feedback for high magnetic environments. The RIK rotary series is a kit style bearingless rotary encoder including a disk with various diameters and line counts, and non-magnetic scanning units to match those diameters. The various sized aluminum disks containing a 20-micron graduation are to be epoxied to the customer's hub design. NUMERIK JENA can also adhere the disks to your custom hub designs at the factory with your exact specifications and lowest runout errors. Find out how HEIDENHAIN technology can be integrated into your highprecision motor, motion control and machining systems processes. C all us or complete the form to get access to other industry position feedback and finishing applications. *All fields required. *First Name: *Last Name: *C ompany: *Phone: * *Zip: Comments: Both encoder systems use the Epiflex Adjustment Tool to enhance the signal margin during installation on
10 the machine. Long cable extensions are also possible for high magnetic field environments. Share Print Please sign me up to receive your enewsletter with new information about HEIDENHAIN solutions. Enter Security C ode: Send HEIDENHAIN 2012
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